Backlight module of liquid crystal display and liquid crystal display

A liquid crystal display backlight and liquid crystal display

0001Cross-references to related art

0002This application claims the name of December 31, 2014 filed: "A liquid crystal display backlight and liquid crystal display" in Chinese patent application CN201410856635.1 priority in its entirety by reference herein.

TECHNICAL FIELD

0003The present invention relates to a liquid crystal display technology, and more particularly, relates to a liquid crystal display backlight and a liquid crystal display.

Background technique

0004With the development of mobile technology, mobile phones have become an everyday essential communication tool. Currently liquid crystal display (Liquid Crystal Display, referred to as LCD) is the most commonly used mobile phone display screen. LCD technology has gone from black and white to color screens and screen from the twisted nematic LCD (TN-LCD) to the thin film transistor LCD (TFT-LCD) development.

0005With the liquid crystal display technology, used in mobile phones in the liquid crystal display size also becomes larger and larger, which also led to the liquid crystal display power consumption also will be getting higher and higher. Backlight power consumption is the main unit of the liquid crystal display, FIG. 1 shows a circuit diagram of a conventional backlight module light source circuit. As shown in Figure 1, the conventional light source circuit are connected in parallel by the multiple light emitting diode circuit, wherein each light emitting diode circuit path and a plurality of light emitting diodes in series made. And this light source circuit structure of a liquid crystal display makes the phone at work, regardless of the performance of the display screen is bright and dark distribution and how changes in demand, light-emitting diode in the circuit are all lit in a state in which the lighting circuit energy consumption continued to be maintained at 100%.

0006This structure makes the conventional backlight power consumption of the LCD screen is usually accounted for 60% to 70% of the overall energy consumption of the phone. As the mobile phone battery capacity limits, large energy consumption characteristics of this LCD also greatly shorten the phone's standby time.

0007Based on the above, with low power consumption characteristics needed a liquid crystal display backlight.

SUMMARY

0009The present invention is to solve the problem is to solve the conventional liquid crystal display backlight power consumption is too large defects. To solve the problem, the first embodiment of the present invention there is provided a liquid crystal display backlight, the backlight module includes a light source circuit and a light guide plate, wherein

0010The light source circuit comprises a control circuit and a plurality of light emitting elements, each light emitting element disposed on the side of the light guide plate and is connected to the control circuit, the respective light emitting unit turns on or off under the control of the control circuit;

0011The light guide plate for a side from the incident light is emitted from the front after processing.

0012The first port is connected according to an embodiment of the present invention, each light emitting unit with a preset power first port, a second port connected to the corresponding port of the control circuit.

0013According to one embodiment of the present invention, the light emitting unit includes a light emitting diode, the light emitting diode is connected to the positive electrode of the first port with a preset power, a negative electrode and the corresponding control single port connection.

0014Each respective second port, respectively, according to one embodiment of the present invention, a light emitting embodiment, the control circuit includes a controllable switch, the first controllable switch port and a second port connected to a preset power, the controllable switch a second port connected to the corresponding unit.

0015According to one embodiment of the present invention, the control circuit by adjusting the duty cycle of the control signal to control the light-emitting unit is on or off when a long, thereby adjusting the brightness of the light-emitting unit.

0016One embodiment of the present invention, the plate including a mutually parallel first and second surfaces, said first surface is provided with parallel cylindrical projection, the cylindrical projection or second surface is provided with a guide according to optical port.

0017According to one embodiment of the present invention, the plate including a mutually parallel first and second surfaces, the first surface and the second surface is provided with a cylindrical projection parallel, the first or the second surface cylindrical projections provided on the surface of the light guide port.

0018According to one embodiment of the present invention, the non-uniform distribution of light axial guide rim of the cylindrical projection.

0019According to one embodiment of the present invention, from a first end of the columnar convex farther, the shorter the interval of the same cylindrical projections adjacent ports between the two light guide.

0020The present invention also provides a liquid crystal display, the liquid crystal display includes office as one of the LCD backlight modules.

0021Compared to the conventional backlight module light source circuit, the present invention provides a backlight module light source circuit enables independent control of the light-emitting unit. Thus, when the liquid crystal display of the display need not have to light up all of the light-emitting unit, a control circuit can be lit light emitting unit needs, while unwanted light emitting unit off. Since all of the light emitting unit does not need is lit, therefore, effectively reducing the energy consumption of the backlight module, thereby extending the powered device (e.g., mobile phones) long use.

0022In addition, the present invention provides a light source circuit is also capable of adjusting the light intensity. Specifically, by adjusting the control signal Duty cycle can be achieved when the controllable switch off long adjustment, that is, the light emitting diode can turn on or off the length adjustment. And over time, LED lights the length of time longer, then looked the brighter light; on the contrary, a period of time, the shorter the length of time the light emitting diode is lit, then the light looks darker. This also realized the light source brightness adjustment.

0023Since the surface of the light guide plate of the present invention, there is provided disposed parallel to each other columnar protrusion, and a columnar projection can be made when a state exhibit relatively convergent light transmission in the light guide plate. Thus, compared to conventional light guide, the light guide plate of the present invention provides a light beam having a better effect. This also makes the light within the light guide plate are significantly reduced crosstalk.

0024In order to ensure uniformity of the light guide plate surface, are distributed in the light guide plate of the present invention, the guide opening provided by the non-uniform distribution. Specifically, in each light guide has a cylindrical projection in the mouth, from a first end of the columnar convex farther (i.e., near one end of the light-emitting element), between the pillar projections in two adjacent light guide notch the shorter the interval, the more dense the light guide port.

0025Near each light emitting element emits light guide port more, but at a position near the light emitting unit of the light guide port distribution is more sparse; and less light reflection away from the mouth of each guide unit of emitted light, but away from the light emitting unit at a position The light guide port are densely distributed. This also makes the various regions of the light guide plate light emitted more balanced, thus ensuring the uniformity of the light guide plate surface.

0026Other features and advantages of the invention will be set forth in the description which follows, and in part will become apparent from the description, or be learned by practice of the invention. The objectives and other advantages of the present invention can be in the specification, drawings and particularly pointed out in the structure of realized and attained by the claims.

BRIEF DESCRIPTION

0027In order to more clearly illustrate the embodiments or the prior art technical solutions embodiment of the present invention, the following embodiments or the drawings will be described in the prior art required the implementation of a brief introduction:

0028FIG. 1 is a circuit diagram of a conventional LCD panel backlight module light source circuit;

0029Figure 2 is a schematic diagram of the circuit according to one embodiment of the present invention backlight module light source circuit;

0030Figure 3a is a block diagram of a conventional backlight module;

0031Figure 3b is a diagram of a conventional optical effect within the light guide plate;

0032Figures 4 and 5, respectively, in accordance with one embodiment of the present invention is an embodiment of the light guide plate front view and a top view;

00336 is a schematic structure of a light guiding plate manufacturing apparatus according to an embodiment of the present invention;

00347 is a schematic structure according to an embodiment of the present invention backlight module;

0035Figure 8 is a light-emitting unit according to one embodiment of the invention of the light path lit renderings within the light guide plate;

0036FIG. 9 is a plurality of light emitting cells to one embodiment of the present invention an optical path lit renderings within the light guide plate;

0037Figure 10 is an optical path diagram a light guide plate within the embodiment of the invention according to;

003811 is a schematic arrangement of the light guide plate according to an embodiment of the present invention, a light guide port;

0039Figures 12 and 13, respectively, of the light guide plate is an example of a front view and a top view according to another embodiment of the present invention;

0040FIG. 14 is a schematic view of the structure of the present invention is a further embodiment of the light guide plate;

004115 is a schematic view of the structure of the present invention, a further embodiment of the light guide plate.

detailed description

0042The accompanying drawings and the following examples illustrate embodiments of the present invention in detail, whereby the present invention is how to apply technology to solve technical problems and implementation process to achieve a technical effect can fully understand and implement accordingly. It should be noted that they do not constitute a conflict, the present invention in various embodiments and various embodiments of the various features can be combined with each other, technical solutions are formed within the scope of the present invention.

0043Meanwhile, in the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. However, this apparent to those skilled in the art that the present invention may be not specific details, or to the particular manner described embodiments.

0044LCD backlight module in order to solve the conventional liquid crystal display backlight problem of high energy consumption, the present embodiment provides a light-emitting unit capable of independent control of each light off state of the backlight module includes a light source and a circuit guide Light board.

0045Figure 2 shows a schematic circuit diagram of a light source of the backlight module circuit.

0046A light source provided in the circuit embodiment shown in Figure 2, the present embodiment includes a control circuit 202, and a plurality of light emitting cells 201. Wherein each light-emitting unit 201 of the control circuit 202 is connected to the corresponding port to turn on or off under the control of the control circuit 202. In this embodiment, the light emitting unit provided at the side of the light guide plate, a light guide plate side. After the incident light side of the light guide plate can be processed from the light guide plate is emitted from the front, a side light is about to be converted to a surface light source.

0047Embodiment, each of the light emitting cells of the first port 201, the respective light emitting cells connected to the corresponding port and a second port control circuit 202 with a preset first port connected to the power supply 201 of the present embodiment. 2, the present embodiment provides a backlight module emitting diode as the light emitting unit. Wherein the positive electrode of the light emitting diode (i.e., a preset positive power supply, i.e. the A port) and a first port connected to a preset power, the corresponding port control circuit 202 is connected with the negative electrode of the light emitting diode.

0048In this embodiment, the control circuit 202 comprises a controllable switch, the controllable switch having a first port and a second plurality of ports. Wherein, the preset power a second port (i.e., a preset negative power, i.e. port K) of the controllable switch connected to a first port, a second port connected to the negative respective controllable switch and the corresponding light emitting diode.

0049When you need to light emitting diodes D1, the controllable switch is turned on B1 and K port port. In this case the light-emitting diode The voltage across the D1 reaches the operating voltage, thereby emitting the light outward. Since the independent control of the controllable switch can be controlled independently of each port and LEDs shut off the connection between the connection (B1 ~ Bn port port) and K port, so it can realize controllable switch for each light-emitting diode light off state . That is to say, the controllable switch can control one or more light emitting diodes simultaneously turned on or off.

0050Of course, in other embodiments of the present invention, the control circuit may be provided between the positive electrode of the light emitting unit and a preset power, the first port and the control circuit connected to the respective light-emitting unit, a second port connected to the negative power source with a preset The present invention is not limited thereto.

0051Compared to the conventional backlight module light source circuit, the circuit according to the light source provided by the present embodiment enables independent control of the light-emitting unit. Thus, when the liquid crystal display according to the display needs not necessarily all of the light emitting element is lit, the control circuit capable of lighting the light emitting unit needs, while unwanted light emitting unit off. Since all of the light emitting unit does not need is lit, therefore, effectively reducing the energy consumption of the backlight module (e.g., a light source circuit of the present embodiment provides a light source compared to the conventional circuit, the energy consumption can be lowered about 40% ), thus extending the power devices (for example mobile phones) use long.

0052In addition, the light source circuit according to the present embodiment is also provided to be able to adjust the brightness of the light source. Specifically, in this embodiment, the controllable switch 202 by adjusting the duty cycle of the control signal can be adjusted when the LED lights on or off long. And over time, LED lights the length of time longer, then looked the brighter light; on the contrary, a period of time, the shorter the length of time the light emitting diode is lit, then the light looks darker. This also realized the light source brightness adjustment.

0053It should be noted that in other embodiments of the present invention, the light emitting unit and / or control circuit may also use other reasonable form of circuit to achieve, the present invention is not limited thereto. For example, in one embodiment of the present invention, the control circuit FPGA circuit to achieve, FPGA circuit enables the switching circuit has a faster response, so that the control circuit of the light-emitting unit control is more accurate and timely.

0054Figures 3a and 3b illustrate a conventional light source circuit schematic structure of the light guide plate and a light guide renderings. As can be seen from Figure 3a, the current source circuit in the form of a light source side, i.e., an LED as a light source provided in the measurement of the light guide plate. When the LED is lit, the light emitted by the LED light guide plate side into the light guide plate. Existing light guide plate is flat structure. From the light guide plate shown in Figure 3b out of the light guide renderings it can be seen in the light guide plate incident to rendering diverging shape. This indicates that the existing light guide plate can not be effectively incident light beam to play the role, which also makes the light guide plate adjacent areas within the incident light prone to crosstalk.

0055To solve the above problems, the present embodiment is also provided which can effectively play the role of the light guide beams. Figures 4 and 5 show the light guide plate in this case provided a front view and a plan view of implementation. As can be seen from Figures 4 and 5, the present embodiment includes a light guide plate case provided parallel to each other a first surface 401 and second surface 402, a first surface 401 and The second surface 402 is provided with parallel cylindrical projection 403 with a preset distance between adjacent cylindrical projection interval.

0056Figure 6 shows a light guide plate for the manufacture of the apparatus in Figures 4 and 5 shown in the embodiment examples provided.

0057The present embodiment example, the light guide plate of raw materials for engineering plastics. In the production process, the melting furnace is first engineering plastic melt into liquid, followed by engineering plastic liquid supplied to the T-shaped head portion roll. There is a certain distance between the T-shaped head and roll unit. Engineering Plastics liquid from the T-head output will decline slowly cooled in the process, and when it reaches the roll, engineering plastic is not completely cooled, thus facilitating the roll forming.

0058In this embodiment, the light guide plate unit roll manufacturing apparatus includes each first rotating roll mating gear and the second rolling wheel. Due to the need in the first and second surfaces of the light guide plate are formed columnar projections, and therefore the present embodiment, the first and the second rolling wheel rolling wheel is provided with projections. The first round and the second rolling wheel can roll on from the T-shaped head is not completely cooled engineering plastic roll-pressed to form the structure of the light guide plate as shown in Figures 4 and 5.

0059In various embodiments of the present invention, the projection on the rolling wheel can be provided at a plurality of circumferential surface of the roll finale to the projections may be provided at a plurality of axial cylindrical roller finale surface projections. This projection is a circumferential projection embodiment of the first embodiment and the second rolling wheel rolling wheel. Because it has a circumferential projection roll the wheel when pressed for engineering plastics is not formed by the projection and roll finale confined space, which can effectively discharge the air inside the engineering plastics. This also makes the roller pressure to give a light guide plate structure more uniform, less impurities within the light guide plate, light guide plate so as to ensure good photoconductive properties.

0060After the completion of the roll portion engineering plastic roll, engineering plastics will be transferred to the transport unit, for delivery by the transport unit from the light guide plate roll section to the end of line. The light guide plate from the roll portion is not completely cooled, the light guide plate on the transmission of the transmission process, as well as engineering plastic cooling process. In order to ensure the light guide plate is not damaged in the process, for example, the transmission portion comprises a plurality of rollers arranged side by side in the present embodiment the elastic, in order to support and transport roll portion from the light guide plate.

0061After the rolling process the light guide plate is formed in the transmission portion of the transmission, the device will be on the light guide plate defect detection unit defect inspection to ensure the structural integrity and reliability of the light guide plate. In addition, due to the production of light guide plates obtained with columnar projections, which also led to easy to fouling between columnar projections. To this end, the light guide plate manufacturing apparatus according to the present embodiment is provided after performing defect inspection will be carried out on the light guide film processed to the upper and lower surfaces are coated with the light guide plate protective film. The protective film is not only able to effectively ensure the cleanliness of the light guide plate and clean, but also to protect the surface of the light guide plate does not receive damage. In this embodiment, coated with a protective film on the light guide plate to have a film. Of course, in other embodiments of the present invention, it is also possible to use other reasonable forms a protective film to be coated on the light guide plate.

0062Finally, through the light guide film after the slicing process, to obtain the desired size of the light guide plate.

0063In order to more clearly presented in Fig beam properties of the light guide plate 4 and 5, the embodiment in accordance with the manner shown in FIG. 7 embodiment, the light emitting element is placed on the side of the light guide plate, and turn on the light emitting unit to make it normal jobs. 8 and FIG. 9 show a light guide plate of the road map to open a light-emitting unit and a plurality of light emitting elements.

0064As it can be seen from FIG. 8 and FIG. 9, since the columnar light guide plate provided in the present embodiment, the projection can be set such that the light exhibits a comparatively convergent state when transmitted within the light guide plate, so compared to the conventional guide light board, light guide embodiment of the present embodiment is provided with a better beam effect. This also makes the light within the light guide plate are significantly reduced crosstalk.

0065Since one role of a side light guide plate is to be converted to a surface light source, so it needs to make the light guide plate is emitted from the surface of the light guide plate. The light guide plate is totally reflected in the form of transport, in order to be able to make the light emitted from the light guide surface, it requires the destruction of such total reflection of the light guide plate structure.

006610, the light guide plate provided in the present embodiment by embodiment in a columnar light guide projection port to break the total reflection of the light guide plate structure. Thus, part of the light guide plate of the light can be emitted from the mouth of the guide, enabling the side surface light source is converted to a function. In this embodiment, shown in Figure 11, the light guide port are disposed on the first surface of the light guide plate of the cylindrical projection, so it does not ensure that the light emitted from the second surface of the light guide plate, thus ensuring utilization of light emitted by the light source circuit to improve the brightness of the backlight module.

0067Since the light-emitting unit is provided at one side of the light guide plate, the light guide plate and the inner light that will be made from each of the light guide exit port. Therefore, this will result in fewer farther away from the light emitting unit of the light guide port of the emitted light. In order to ensure uniformity of the light guide plate surface of the light guide plate are distributed examples provided in the light guide port of the light guide port non-uniformity distribution of this embodiment. Specifically, in each light guide has a cylindrical projection in the mouth, from a first end of the columnar convex farther (i.e., near one end of the light-emitting element), between the pillar projections in two adjacent light guide notch the shorter the interval, the more dense the light guide port.

0068Near each light emitting element emits light guide port more, but at a position near the light emitting unit of the light guide port distribution is more sparse; and less light reflection away from the mouth of each guide unit of emitted light, but away from the light emitting unit at a position The light guide port are densely distributed. This also makes the various regions of the light guide plate light emitted more balanced, thus ensuring the uniformity of the light guide plate surface.

0069It should be noted that in other embodiments of the present invention can also be used other reasonable means to ensure uniformity of the light guide plate of the present invention is not limited thereto.

0070In one embodiment of the present invention, the light guide plate may be used in the configuration shown in FIG. 12 and FIG. 13. Figures 12 and 13 show a front view of the light guide plate and a top view. As can be seen from these figures, the light guide plate compared in Figures 4 and 5 shown, there is no space between the guide plate adjacent the cylindrical projection, and the first and second surfaces in on the same plane. This also can be seen as the light guide plate by a plurality of cylinders arranged side by side together.

0071In still another embodiment of the present invention, the structure of the light guide plate 14 may be used as shown in FIG. As can be seen in conjunction with Figure 4, the light guide plate shown in Fig. 4 compared to the first surface of the light guide plate is formed only in the columnar convex second surface remains planar structure. In this embodiment, the light guide notches are provided on the second surface. This is because the second surface is a planar structure, the light guide port is formed on a planar structure easier (such as wet etching, etc.). In the cylindrical protrusion formed on the first surface More difficult to light guide port (usually it requires the use of laser etching process), which significantly increases the difficulty and cost of production of the light guide plate. Of course, in the case of technology and costs permit, the light guide port may be provided on a first surface of the cylindrical projection, the present invention is not limited thereto.

0072In a further embodiment of the present invention, the light guide plate 15 may have a configuration according to FIG. As can be seen in conjunction with Figure 14, the light guide plate shown in FIG. 15 except there is no spacing between adjacent cylindrical projections, the other structures are the same as the light guide plate shown in FIG. 14, are not discussed here.

0073Compared to the conventional backlight module light source circuit, the present invention provides a backlight module light source circuit enables independent control of the light-emitting unit. Thus, when the liquid crystal display of the display need not have to light up all of the light-emitting unit, a control circuit can be lit light emitting unit needs, while unwanted light emitting unit off. Since all of the light emitting unit does not need is lit, therefore, effectively reducing the energy consumption of the backlight module, thereby extending the length of the current when using electrical devices.

0074In addition, the present invention provides a light source circuit also enables the tunable light source luminance. In particular, the controllable switch by adjusting the duty cycle of the control signal can be adjusted when the LED lights on or off long. And over time, LED lights the length of time longer, then looked the brighter light; on the contrary, a period of time, the shorter the length of time the light emitting diode is lit, then the light looks darker. This also realized the light source brightness adjustment.

0075Since the surface of the light guide plate of the present invention, there is provided disposed parallel to each other columnar protrusion, and a columnar projection can be made when a state exhibit relatively convergent light transmission in the light guide plate. Thus, compared to conventional light guide, the light guide plate of the present invention provides a light beam having a better effect. This also makes the light within the light guide plate are significantly reduced crosstalk.

0076In order to ensure uniformity of the light guide plate surface of the light guide plate are distributed in the present invention provides a light guide port for non-uniformity of the light guide port distribution. Specifically, in each light guide has a cylindrical projection in the mouth, from a first end of the columnar convex farther (i.e., near one end of the light-emitting element), between the pillar projections in two adjacent light guide notch the shorter the interval, the more dense the light guide port.

0077Near the light emitting unit each light guide port emitted more light, but the light emitting unit at a position close to the light guide port distribution is more sparse; and less reflective unit away from the respective light guide port position emitted light, but away from the light-emitting unit The light guide port are densely distributed. This also makes the various regions of the light guide plate light emitted more balanced, thus ensuring the uniformity of the light guide plate surface.

0078It should be understood that the disclosed embodiments of the present invention is not limited by the specific structures disclosed herein, or material processing steps, but should extend to those of ordinary skill in the relevant understood equivalents of these features. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments and is not meant to be limiting.

0079Specification to "one embodiment" or "an embodiment" means that a particular feature of the embodiment described, structure, or characteristic is included in at least one embodiment of the present invention. Accordingly, various places throughout the specification appearances of the phrase "a One embodiment "or" an embodiment "are not necessarily all referring to the same embodiment.

0080For convenience, a number of projects in this use of the structural units, constituent units and / or materials may be present in the common list. However, these lists should be construed as each element in the list are identified as separate sole members. Thus, in the absence of negative description, not on this list may be based on a member of only one of them will appear in the common list is interpreted as the same list facto equivalent of any other member. In addition, this may also be in conjunction with a variety of alternatives for each element of the present invention together with reference to the embodiments and examples. It should be understood that these embodiments are not to be construed as exemplary and alternative equivalent to each other, which is considered to be a separate independent representative thereof.

0081Furthermore, the described features, structures, or characteristics may be combined in any other suitable manner to one or more embodiments. In the above description, some specific details, such as length, width, shape, etc., in order to provide an embodiment of the present invention is fully understood. However, in the relevant art will appreciate that the present invention without one or more of the specific details can be achieved, or may employ other methods, components, materials, or the like. In other instances, well-known structures, materials, or operations have not shown or described in detail to avoid obscuring aspects of the present invention.

0082Although the above example is used to illustrate the principles of the invention in one or more applications, but for the skilled artisan, without departing from the principles and ideas of the present invention, the obvious can be in form, usage and implementation various modifications without any creative effort on the details. Accordingly, the present invention is defined by the appended claims limited.