Liquid crystal display panel and methods of manufacturing the same

The present disclosure relates to a liquid crystal display panel, specifically a passive matrix display panel, and a method for manufacturing the same.

The field of flexible display devices has received a lot of attention because it can be manufactured by a roll-to-roll process. Roll-to-roll manufacturing has several potential benefits, including traditional precision coating techniques, potential manufacturing cost reductions, and faster manufacturing cycles.

The fabrication of passive matrix devices by a continuous web line raises the issue of singleizing devices that simultaneously access conductive leads embedded within passive matrix devices. Flexible devices that provide conductivity to passive matrix drive schemes, such as cholesteric liquid crystal display devices, typically include rows and columns of conductive traces, such as indium tin oxide, on opposing substrates through the conductive traces. An electrical pulse or signal for switching devices is propagated. The conductive trace is patterned on the upper surface of a substrate such as a polymer substrate. Accessing the conductive leads in the device made by the roll-to-roll process is very difficult for webs of equal width, as all contacts are embedded within the structure.

<p> The above problem can be alleviated to some extent by shifting the base material that can access the conductive lead wire extending perpendicular to the web direction. Alternatively, the upper and lower substrates can be cut to different dimensions to individualize the device without losing access to the conductive leads. Conventional cutting techniques are particularly difficult for devices with thin display materials that coat between substrates. Cutting through one substrate without scraping the conductive leads on the opposing substrates is not an easy task as there are few precise and precise cutting techniques within the micrometer range.</p>

<p> The present disclosure relates to a liquid crystal display panel, specifically, a passive matrix display panel and a method for manufacturing the same.</p><p> In the first embodiment, the liquid crystal cell article comprises a layer of liquid crystal material disposed between the first polymeric substrate and the second polymeric substrate. The first polymer base material is arranged on the first polymer base material and a plurality of first parallel conductive traces extending in the first direction and arranged between the layer of the liquid crystal material and the first base material. Including the first release liner. The second polymeric substrate comprises a plurality of second parallel conductive traces extending in a second direction orthogonal to the first direction and disposed between the layer of liquid crystal material and the second substrate. The first polymeric substrate further comprises a removable portion that can be separated from the first polymeric substrate along with a first release liner to expose a layer of liquid crystal material or a portion of the second parallel conductive trace.</p><p> In another embodiment, the method of producing a liquid crystal cell comprises providing a liquid crystal cell article having a layer of liquid crystal material disposed between the first polymer substrate and the second polymer substrate. The first polymer base material is arranged on the first polymer base material and a plurality of first parallel conductive traces extending in the first direction and arranged between the layer of the liquid crystal material and the first base material. Including a first release liner, the first polymeric substrate further comprises removable portions that may be formed prior to placement of the layer of liquid crystal material. The second polymeric substrate comprises a plurality of second parallel conductive traces extending in a second direction orthogonal to the first direction and disposed between the layer of liquid crystal material and the second substrate. The method further comprises the step of separating the first release liner and the removable portion to expose part of a layer of liquid crystal material or part of a second parallel conductive trace.</p><p> In a further embodiment, the method of producing a liquid crystal cell comprises arranging a layer of liquid crystal material between the first polymer base material and the second polymer base material forming the liquid crystal cell. The first polymer base material is arranged on the first polymer base material and a plurality of first parallel conductive traces extending in the first direction and arranged between the layer of the liquid crystal material and the first base material. The first polymeric substrate further comprises a removable portion, including a first release liner. The second polymeric substrate comprises a plurality of second parallel conductive traces extending in a second direction orthogonal to the first direction and disposed between the layer of liquid crystal material and the second substrate. The method further comprises the step of separating the first release liner and the removable portion to expose part of a layer of liquid crystal material or part of a second parallel conductive trace.</p>

The present invention, along with the accompanying drawings, can be more fully understood by the following detailed description of the various embodiments of the invention.<figref num="1">Schematic plan view of an exemplary laminate of two substrates forming multiple liquid crystal cells on a continuous webbing.</figref><figref num="2">Schematic side view of an exemplary laminate obtained along line 2-2, shown in FIG.</figref><figref num="3">Schematic of an exemplary roll-to-roll stacking process for forming multiple liquid crystal cells in a continuous webbing.</figref><figref num="4A">Schematic plan view of an exemplary laminate of two substrates forming multiple liquid crystal cells in a continuous webbing according to an embodiment.</figref><figref num="4B">Schematic plan view of an exemplary laminate of two substrates forming multiple liquid crystal cells in a continuous webbing according to an embodiment.</figref><figref num="4C">Schematic plan view of an exemplary laminate of two substrates forming multiple liquid crystal cells in a continuous webbing according to an embodiment.</figref><figref num="5">Schematic plan view of another exemplary laminate of two substrates forming multiple liquid crystal cells on a continuous webbing.</figref>

The figure is not always at a constant scale. Similar numbers used in the figures indicate similar components. However, it is understood that the use of a code to refer to a component in any figure is not intended to limit the component in another figure, marked with the same code.

In the following description, the accompanying drawings will be referred to, which are part of the present application and provide examples of some particular embodiments. It is understood that other embodiments are envisioned and can be made without departing from the scope or gist of the present invention. Therefore, the following detailed description is not construed in a limited sense.

Unless otherwise specified, all scientific and technical terms used herein have meanings that are widely used in the art. The provisions provided herein facilitate the understanding of certain terms frequently used herein and are not intended to limit the scope of this disclosure.

Unless otherwise stated, all numerical values representing the size, quantity, and physical characteristics of the mechanism as used herein and in the claims are to be understood as being modified by the term "about" in any case. Will be done. Therefore, unless otherwise stated, the numerical indicators set forth herein and in the appended claims will depend on the desired characteristics to be obtained by those skilled in the art utilizing the teachings disclosed herein. It is an approximate value that can change.

The detailing of the numerical range between the endpoints includes all numbers that fall within that range (eg, 1-5 includes 1, 1.5, 2, 2.75, 3, 3.80, 4, and 5). ) And all values within that range are included.

As used herein and in the appended claims, the singular forms "a", "an" and "the" refer to embodiments having multiple referents, unless the content specifically dictates otherwise. Include. When used in the present specification and the appended claims, the term "or" is generally used to include "and / or" unless otherwise stated in its content.

The present disclosure relates to a liquid crystal display panel, specifically a passive matrix display panel, and a method for manufacturing the same. Instead of the method of making precise cuts after the formation of the liquid crystal cell (and with the risk of scraping or breaking the conductive leads on the opposing substrate), the "window" is placed on the substrate before the liquid crystal coating and laminating step. The windows can be removed in the process after the liquid crystal coating and laminating steps, pre-cut in. The "window" may be a rectangle, slit, or any other pattern of the dimensions and shape required to access the conductive leads. Pre-cutting the above "windows" or slits in the substrate eliminates the need to cut the substrate after coating, resulting in damage to the conductive leads on the opposing substrate and the conductivity of the leads. The risk of losing sex is reduced. Although the disclosure is not so limited, an understanding of various aspects of the invention can be gained through the description of the examples set forth below.

FIG. 1 is a schematic plan view of an exemplary laminate of two substrates forming a plurality of liquid crystal cells 100 on a continuous webbing. Each of the illustrated substrates is one section of continuous webbing, and each section has three cells. Each substrate can have more or fewer cells, and in many embodiments, each continuous webbing will optionally contain multiple cells, such as, for example, 10 or more, 25 or more, 50 or more, or 100 or more. It is understood to have. FIG. 2 is a schematic side view of the exemplary laminate shown in FIG. 1 and is a schematic side view obtained along line 2-2. Each liquid crystal cell division 100 includes a layer 110 of a liquid crystal material arranged between the first polymer base material 130 and the second polymer base material 120.

The first polymer substrate 130 includes a plurality of first parallel conductive traces 132, which extend in the first direction and are arranged between the layer 110 of the liquid crystal material and the first substrate 130. .. The first release liner 150 is arranged on the first polymer base material 130. In many embodiments, the plurality of first parallel conductive traces 132 are divided into a plurality of individual first portions 102, which portions have a first trace end and an opposing second trace end. ..

The second polymer substrate 120 includes a plurality of second parallel conductive traces 122, which extend in a second direction orthogonal to the first direction and with a layer 110 of liquid crystal material and a second substrate 120. Placed between. In many embodiments, the second release liner 140 is placed on the second polymeric substrate 120. In many embodiments, the plurality of second parallel conductive traces 122 are divided into a plurality of individual second portions 101 having a first trace end and an opposing second trace end. In some embodiments, the plurality of second parallel conductive traces 122 are continuous lines having trace ends formed by individualizing each cell.

The first polymeric substrate 130 further includes a removable portion 134 that can be separated from the first polymeric substrate 130 along with the first release liner 150 to expose a portion of the liquid crystal material layer 110. A portion of the exposed liquid crystal material layer 110 is wiped to expose the second parallel conductive trace 122. The removable portion 134 is separated with the liner 150 and separated from the first polymer substrate 130 when the removable liner 150 is separated from the remaining first polymer substrate 130. The removable portion 134 is defined by a predetermined slit or fragile line 135, such as a perforated line. The predetermined slit or fragile line 135 can be formed by any useful method, such as punching, laser cutting, and the like.

In many embodiments as shown in FIG. 1, the second polymeric substrate 120, along with the second release liner 140, is the second polymeric substrate 120 to expose a portion 126 of the liquid crystal material layer 110. Also includes a removable portion 124 that can be separated from. Part 126 of the exposed liquid crystal material layer 110 can be wiped to expose the first parallel conductive trace 132. The removable portion 124 separates with the liner 140 and separates from the second polymer substrate 120 when the removable liner 140 separates from the remaining second polymer substrate 120. The removable portion 124 is defined by a predetermined slit or fragile line 125, such as a perforated line. The predetermined slit or fragile line 125 can be formed by any useful method such as punching, laser cutting, embossing and the like.

The first portion 102 and the second portion 101 are aligned and laminated together with the liquid crystal layer arranged between them to form the liquid crystal cell portion 103. The removable portion, along with the release liner, can be detached from the polymeric substrate to provide access to the underlying conductive traces on the opposite polymeric substrate that form the liquid crystal cell or passive matrix liquid crystal cell. .. Next, each liquid crystal cell portion 103 can be individually separated and incorporated into the display device, if desired.

The liquid crystal cell configuration described above and the method of forming a continuous webbing of the liquid crystal cell described below provide a method of accessing conductive leads and can be used in various display techniques in a continuous roll-to-roll process. Some advantages of the configurations and methods described herein are in the method of accessing the post-lamination conductive leads by removing the pre-cut portion, as compared to the method of making accurate cuts after stacking. It is easier and there is no risk of scratching or breaking the conductive leads when making accurate cuts after stacking. If the pre-cut window is removed prior to coating, the pre-cut window or opening, or removable portion, should be used as the substrate to avoid wasting liquid crystal coating material by filling the resulting voids. It is advantageous to keep it in place. In addition, leaving the pre-cut windows in place minimizes possible coating interruptions due to sudden changes in substrate thickness. The substrate can be pre-cut against the background of a liner that acts as a supporting material that maintains both the substrate and the pre-cut pattern during coating. After the coating is complete, the liner can be stripped before or at the same time that the pre-cut windows are subsequently removed. The liquid crystal material can be removed in the vicinity of the removed window by wiping with a suitable solvent such as isopropyl alcohol or methanol so that the exposed conductive leads can be accessed.

The first polymer base material 130 and the second polymer base material 120 can be formed from any useful polymer material. In many embodiments, one or both polymeric substrates 130 and 120 may be transparent to visible light. In many embodiments, the first polymer base material 130 and the second polymer base material 120 are suitable having sufficient mechanical properties (eg, strength and flexibility) to be processed in a roll-to-roll apparatus. Formed from a polymer material. Roll-to-roll refers to the process by which a material is wound on or unwound from a support and, in addition, further processed in some way. Examples of further processes include coating, slitting, punching, and exposure to radiation. Examples of such polymers include thermoplastic polymers. Examples of useful thermoplastic polymers include polyolefins, polyacrylates, polyamides, polyimides, polycarbonates, polyesters, and biphenol or naphthalene liquid crystal polymers. Further examples of useful thermoplastics include polyethylene, polypropylene, polystyrene, poly (methylmethacrylate), bisphenol A polycarbonate, poly (vinyl chloride), polyethylene terephthalate, polyethylene naphthalate, and poly (vinylidene fluoride). Can be mentioned. Some of these polymers also have optical properties (eg, transparency) that are particularly well suited for specific display applications, where they are patterned conductors such as polycarbonate, polyimide, and / or polyester. Support the body.

The first polymer base material 130 and the second polymer base material 120 are flexible. The first substrate 130 and the second substrate 120 can have any useful thickness. These polymeric substrates 130 and 120 generally range from about 5 micrometers to 1000 micrometers, or 25 micrometers to 500 micrometers, or 50 micrometers to 250 micrometers, or 75 micrometers to 200 micrometers. It can be made in various thicknesses.

The plurality of first parallel conductive traces 132 and the plurality of second parallel conductive traces 122 can be formed by any useful method such as sputtering, chemical vapor deposition, and the like. The parallel conductive traces 132, 122 can be a relatively conductive and transparent coating. In many embodiments, the parallel conductive traces 132, 122 are transparent to visible light. Parallel conductive traces 132, 122 can contain indium tin oxide, ie ITO, which can be transparent to visible light, depending on the thickness of the ITO conductor. In many embodiments, the parallel conductive traces 132, 122 have generally uniform area resistance. The parallel conductive traces 132, 122 can have any useful thickness, for example, a thickness of 10-100 nm. The pattern of the parallel conductive traces 132, 122 may depend to some extent on the display type and design parameters, such as the dimensions of the end-user display. Parallel conductive traces 132, 122 can include antimony oxide, zinc oxide, or other suitable conductive material.

The liquid crystal layer 110 can be formed from any liquid crystal useful for display applications such as passive matrix displays. In many embodiments, the liquid crystal layer 110 is formed from a cholesteric liquid crystal. Cholesteric liquid crystal compounds generally contain molecular units that are chiral in nature (eg, molecules that do not have a mirror surface) and molecular units that are mesogenic in nature (eg, molecules that exhibit a liquid crystal phase). As well as being included, it can be a polymer. The cholesteric liquid crystal composition may further include a non-chiral liquid crystal compound (nematic) mixed with chiral units, i.e. containing chiral units. Examples of the cholesteric liquid crystal composition or material include compounds having a cholesteric liquid crystal phase, in which the director of the liquid crystal (a unit vector that specifies the average local molecular alignment direction) forms a right angle to the director. It rotates spirally along the dimensions. The cholesteric liquid crystal composition is also called a chiral nematic liquid crystal composition. The pitch of a cholesteric liquid crystal composition or material is the distance required for the director to rotate 360 degrees (perpendicular to the director and along the cholesteric spiral axis). This distance is generally 100 nm or more.

The pitch of the cholesteric liquid crystal material can be produced by mixing the chiral compound with the nematic liquid crystal compound or otherwise combining them (eg, by copolymerization). The cholesteric phase can also be produced by a chiral non-liquid crystal material. The pitch will depend on the relative weight ratio of the chiral compound to the nematic liquid crystal compound or material. The twist of the director's helix causes spatial periodic variation of the dielectric tensor of the material, resulting in wavelength-selective reflection of light. For example, the pitch can be selected such that the Bragg reflection peaks in the visible, ultraviolet, or infrared wavelength region of light.

Cholesteric liquid crystal compounds, including cholesteric liquid crystal polymers, are generally known, and typically any of these materials can be used to make an optical body. Examples of suitable cholesteric liquid crystal polymers are described in U.S. Pat. Nos. 4,293,435, 5,332,522, 5,886,242, 5,847,068, 5,780,629, 5,744,057, all by reference. Incorporated herein. In addition, other cholesteric liquid crystal compounds can also be used. Cholesteric liquid crystal compounds may be selected based on one or more factors to suit a particular application or optic, eg, the factors include refractive index, surface energy, pitch, processability, Transparency, color, low absorption at problematic wavelengths, compatibility with other constituents (eg, nematic liquid crystal compounds, etc.), molecular weight, ease of fabrication, availability of liquid crystal compounds or monomers to form liquid crystal polymers, Leology, curing methods and requirements, ease of solvent removal, physical and chemical properties (eg, flexibility, tensile strength, solvent resistance, scratch resistance, and phase transition temperature), and ease of purification. including.

In many embodiments, the cholesteric liquid crystal layer is a polymer-dispersed liquid crystal composition comprising a liquid crystal phase (dispersed phase) dispersed in a polymer matrix (continuous phase). In many embodiments, the polymer-dispersed liquid crystal composition is formed by polymerization-induced phase separation (PIPS), and the size of the liquid crystal phase droplets formed is at least partially controlled by the polymerization reaction rate. ..

In many embodiments, the structure forms a bistable reflective cholesteric liquid crystal display or a passive matrix display. When an electric field (E) is applied to the entire parallel conductive traces 132, 122, the liquid crystal aligns with either a reflecting planar state or a scattered focal cone state. Both of these states are stable at E = 0 and therefore the structure is fixed and remain in their original state until re-acted (ie, the device is bistable). Switching from the planar state to the focal cone state requires a low voltage pulse, while returning from the focal cone state to the planar state requires a high voltage pulse, putting the device in the homeotropic state. After that, it relaxes to the final flat state. An exemplary drive scheme for switching single-pixel cholesteric liquid crystal display (ie, ChLCD) cells has been described by Deng-Ke Ynag et al. (Annual Report of Materials Science (Annu. Rev). . Mater. Sci.), 1977, Vol. 27, pp. 117-146). According to the reflectance vs. voltage plot described in this document, the ChLCD cell can be switched to the voltage value when the cell is in the planar state or the voltage value when the cell is in the focal cone state. The relevant pulse trains (frequency and amplitude) can be implemented by anyone skilled in the art.

Representative liquid crystal compositions are described in the pending US Patent Application Publication No. 11 / 557,540 (Agent Reference No. 62381US002) filed on November 8, 2007, the disclosure of which is by reference. Incorporated herein, the disclosure provides a corresponding stable planar reflection. Stable reflection means that the cell does not exhibit reflection loss after being flattened by voltage and then placed under ambient conditions for about 3 days.

The liquid crystal layer 110 can have any useful thickness, for example, a thickness in the range of 1 to 15 micrometers. This polymer-dispersed liquid crystal layer 110 with a thickness in the range of 1 to 15 micrometers is 0.1 to 10 mW / cm.²Range, or 0.2 ~ 3mW / cm²It can be formed by radiation curing in the range of.

The polymer-dispersed liquid crystal layer 110 can be formed by a process of mixing and polymerizing a reactive prepolymer / liquid crystal composition. In many embodiments, the reactive prepolymer / liquid crystal composition forms a single phase, where the liquid crystal does not polymerize. When the composition polymerizes, the polymer separates from the liquid crystal and the liquid crystal forms liquid crystal domains (eg, droplets) dispersed within the polymer matrix. This phase separation process is referred to as polymerization-induced phase separation (ie, PIPS). In the PIPS process, the polymer phase separates from the liquid crystal phase during polymerization as the length of the polymer increases. The reactive prepolymer / liquid crystal composition comprises a liquid crystal component, a photopolymerization initiator and a polymer precursor component. These components are selected to form a single phase until the prepolymer / liquid crystal composition polymerizes.

The liquid crystal component can be any useful liquid crystal, such as, for example, a cholesteric liquid crystal material or a nematic liquid crystal material. The liquid crystal can be present in any useful amount in the composition. In many embodiments, the liquid crystal can be present in the composition in the range of 60-95% by weight, or 70-95% by weight.

The photopolymerization initiator may be any useful photopolymerization initiator. In many embodiments, the photoinitiators include hydroxy-alkylbenzophenones (eg, Darocur®, available from Merck), benzoin ethers, alkylphenones, benzophenones, xanthones, thioxanthones, phosphines. Examples include oxides (eg, Irgacure® 819 available from Ciba Specialty Chemicals) and derivatives thereof. Additional useful photopolymerization initiators are described in US Pat. No. 5,516,455, which is incorporated by reference to the extent consistent with this disclosure. The photopolymerization initiator can be present in any useful amount in the composition. In many embodiments, the photopolymerization initiator can be present in the range of 0.01 to 10% by weight, or 0.1 to 5% by weight, or 1 to 2% by weight.

In some embodiments, the liquid crystal layer 110 includes spatial beads (not shown) that help provide uniform spacing between the polymeric substrates.

FIG. 3 is a schematic view of an exemplary roll-to-roll laminating process 200 for forming multiple liquid crystal cells in the continuous webbing described above. The apparatus 200 includes a webbing 230 having a plurality of first parallel conductive traces 232 extending in the first direction, that is, a first roll 202 for a continuous polymer substrate, and a second parallel conductive trace extending in a second direction orthogonal to the first direction. Includes a webbing 220 having a plurality of 222s, ie, a second roll 201 for a continuous polymeric substrate. In many embodiments, the plurality of first parallel conductive traces 232 and the plurality of second parallel conductive traces 222 are divided into a plurality of individual portions as described above. The first roll 202 for the continuous polymeric substrate or webbing 230 comprises a first release liner 250 and the second roll 201 for a continuous polymeric substrate or webbing 220 includes a second release liner 240.

The device 200 includes first and second cutting devices 233, 223 associated with the first and second webbing 230, 220. After stacking the webbings, the cutting devices 233 and 223 cut, emboss, or perforate the first and second webbings 230 and 220 at predetermined positions corresponding to the conductive trace ends (described above) of the opposing webbings. )I do. The cutting devices 233, 223 form removable portions 234, 224 (described above) of the webbing that are removed together with the liners 250, 240 after laminating the first and second webbings 230, 220.

The device 200 includes a pair of nip roller 205s that define a nip point 206. The nip roller moves the first and second webbing 230, 220 towards the nip point 206, where the liquid crystal dispenser 210 distributes the liquid crystal material and liquid crystal between the first webbing 230 and the second webbing 220. The materials are laminated to form the liquid crystal cell webbing 207.

The liquid crystal cell webbing 207 is cured by the curing element 260, and the release liners 250 and 240 can be removed from the liquid crystal cell webbing 207. In some embodiments, the release liners 250, 240 are removed from the liquid crystal cell webbing 207 after the liquid crystal cell webbing 207 has been cured by the curing element 260. In another embodiment, the release liners 250, 240 are removed from the liquid crystal cell webbing 207, and then the liquid crystal cell webbing 207 is cured by the curing element 260. The removable portions 234, 224 are removed together with the release liners 250, 240 so that the underlying conductive traces on the polymer substrate on the opposite side forming the liquid crystal cell or passive matrix liquid crystal cell can be accessed. The liquid crystal cell continuous webbing 207 may be placed on the product roll 203 and / or, as described above, each liquid crystal cell portion may be fragmented and assembled into a display device.

FIG. 5 is a schematic plan view of another exemplary laminate of two substrates forming multiple liquid crystal cells 300 on a continuous webbing. Each of the illustrated substrates is a section of continuous webbing, each section having 9 cells, i.e. 3x3 sections. Each substrate can have more or fewer cells in any arrangement, and in many embodiments, each continuous webbing will optionally have, for example, 10 or more, 25 or more, 50 or more, or 100 or more. It is understood that it has a plurality of cells. As described above, each liquid crystal cell division 300 includes a layer of liquid crystal material arranged between the first polymer base material 330 and the second polymer base material 320.

The first polymer substrate 330 includes a plurality of first parallel conductive traces 332 extending in the first direction and disposed between the layer of liquid crystal material and the first substrate 330. The first release liner described above is arranged on the first polymer base material 330. In many embodiments, the plurality of first parallel conductive traces 332 are divided into a plurality of individual first portions 302 having a first trace end and an opposing second trace end. In some embodiments, the plurality of second parallel conductive traces 332 are continuous lines having trace ends formed by individualizing each cell 303.

The second polymer base material 320 includes a plurality of second parallel conductive traces 322 extending in a second direction orthogonal to the first direction and arranged between the layer of the liquid crystal material and the second base material 320. .. In many embodiments, the second release liner is placed on the second polymeric substrate 320. In many embodiments, the plurality of second parallel conductive traces 322 are divided into a plurality of individual second portions 301 having a first trace end and an opposing second trace end. In some embodiments, the plurality of second parallel conductive traces 322 are continuous lines having trace ends formed by individualizing each cell 303.

The first polymeric substrate 330 further comprises a removable portion 334 that can be separated from the first polymeric substrate 330 together with a first release liner (described above) to expose a portion of the layer of liquid crystal material, and is exposed. A portion of the liquid crystal material layer that has been removed can be wiped to expose the second parallel conductive trace 322. As described above, the removable portion 334 is separated together with the liner and separated from the first polymer base material 330 when the removable liner 350 is separated from the remaining first polymer base material 330. The removable portion 334 is defined by a predetermined slit or fragile line, such as a perforated line. A given slit or fragile line can be formed by any useful method, such as punching, laser cutting, and the like.

In many embodiments, as shown in FIG. 5, the second polymeric substrate 320, as described above, is the second polymeric substrate 320 along with the second release liner to expose a portion of the layer of liquid crystal material. It further comprises a removable portion 324 that can be separated from, and this removable portion can be wiped to expose the first parallel conductive trace 332. As described above, the removable portion 324 is separated from and separated from the second polymer base material 320 together with the liner when the removable liner is separated from the remaining second polymer base material 320. The removable portion 324 is defined by a predetermined slit or fragile line, such as a perforated line. The predetermined slit or fragile line can be formed by any useful method such as punching, laser cutting, embossing and the like.

The first portion 302 and the second portion 301 are aligned and laminated together with the liquid crystal layer arranged between them to form the liquid crystal cell portion 303. The removable portion can be stripped from the polymeric substrate along with the release liner so that the underlying conductive traces on the polymeric substrate on the opposite side forming the liquid crystal cell or passive matrix liquid crystal cell can be accessed. Next, each liquid crystal cell portion 303 can be fragmented and assembled into a display device, if desired.

The liquid crystal cell configuration described above, and the method of forming a continuous webbing of the liquid crystal cell described above, provide a method of accessing conductive leads and can be used in various display techniques in a continuous roll-to-roll process.

<p> As shown in Figures 4A and 4B, ITO rows and columns were patterned on a 127 micrometer (5 mil) DuPont Teijin ST-504 polyethylene terephthalate film 61 cm (24 inches) wide. .. This web has two widths of 15.2 cm (6 inches) wide with a column pattern (crossweb ITO line 422 in Figure 4A) and 10.8 cm (4.25 inches) with a row pattern (downweb ITO lines 432 in Figure 4B). ) Slits were made in four widths, with two widths. Two 15.2 cm (6 inch) wide rolls (Figure 4A) were laminated with a clear liner on the non-ITO side. Window 424 was punched by rotating between the column patterns of the substrate. The dimensions of each window 424 were approximately 8.9 cm (3.5 inches) x 10.2 cm (4 inches). Window 424 remained in place with the rest of the substrate on the clear support liner.</p><p> This punched 15.2 cm (6 inch) column pattern webbing (Fig. 4A) was placed in a roll-to-roll device as a lower substrate. The narrower 10.8 cm (4.25 inch) row pattern webbing (Fig. 4B) was placed on the roll-to-roll device as the top substrate. FIG. 4C shows a schematic plan view of the base materials arranged.</p><p> The two substrates were combined in a nip process, in which the cholesteric liquid crystal coating solution was distributed between the substrates, subsequently cured and sheeted at the end of the roll-to-roll device. The liner was then removed from the back side of the column substrate, and the pre-cut windows were also removed with the liner. After removing the window, the area under the window was wiped with alcohol to expose the exposed electrical contacts.</p><p> As described above, an embodiment of "a liquid crystal display panel and a method for manufacturing the same" has been disclosed. Those skilled in the art will appreciate that the present invention may be practiced in embodiments other than those disclosed. The disclosed embodiments are presented for purposes of illustration only, without limitation, and the present invention is limited only by the claims that follow.</p>