Touch sensor-equipped display device

TECHNICAL FIELD

The present invention relates to a touch sensor-equipped display device.

BACKGROUND ART

Patent Document 1 discloses a touch sensor-equipped display device that includes touch drive electrodes and touch detection electrodes. In this touch sensor-equipped display device, slits are provided in the touch detection electrodes so that the touch detection electrodes become unnoticeable to human eye.

PRIOR ART DOCUMENT

Patent Document

<ul id="ul0001" list-style="none"><li id="ul0001-0001" num="0003">Patent Document 1: JP-A-2014-130537</li></ul>

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

If, however, the array pattern of subpixels that compose a plurality of display pixels arranged in matrix, and the pattern of the slits in the touch detection electrodes interfere with each other, moire occurs, whereby the display quality of the display device decreases.

It is an object of the present invention to provide a touch sensor-equipped display device in which interference between the array pattern of sub pixels that compose display pixels and the pattern of slits in the detection electrodes is suppressed.

Means to Solve the Problem

A touch sensor-equipped display device in one embodiment of the present invention includes: a display panel including a first substrate, a second substrate opposed to the first substrate, and a display function layer interposed between the first substrate and the second substrate, the display function layer including a plurality of display pixels arranged in matrix; a touch drive electrode that is provided between the first substrate and the second substrate and extends in a first direction; and a touch detection electrode that is provided on a surface of the first substrate on a side opposite to the touch drive electrode, and extends in a second direction that intersects with the first direction at a right angle. In the touch sensor-equipped display device, a plurality of slits each of which is repeatedly bent in a zigzag shape while extending in the second direction are provided in the touch detection electrode so as to be arrayed in the first direction; an arrangement interval “a” for the slits adjacent in the first direction satisfies relationship given as:

<br /><i>a=b</i>×(0.725+<i>n</i>)×√3÷(2×cos θ)

where “b” represents an arrangement interval for the display pixels adjacent in the first direction, “θ” represents an angle of the slits with respect to the second direction as a reference direction, and “n” represents an integer equal to or greater than 0; and a turnback width of the slits in the zigzag shape is set to (a distance between centers of subpixels adjacent in the first direction among subpixels composing one display pixel)×{a natural number equal to or greater than (the number of colors of the subpixels+1)}.

Effect of the Invention

With the present invention, the occurrence of moire caused by the interference between the array pattern of subpixels and the pattern of the slits in the touch detection electrode can be suppressed, whereby the display quality of the display device can be improved.

BRIEF DESCRIPTION OF DRAWINGS

<figref idref="DRAWINGS">FIG. 1</figref> illustrates a cross-sectional configuration of a touch sensor-equipped display device in one embodiment.

<figref idref="DRAWINGS">FIG. 2</figref> is a plan view illustrating the touch sensor-equipped display device in one embodiment.

<figref idref="DRAWINGS">FIG. 3</figref> is a schematic cross-sectional view of a liquid crystal panel with a touch sensor function.

<figref idref="DRAWINGS">FIG. 4</figref> is an enlarged plan view illustrating a plan-view configuration in a display section of an array substrate that composes the liquid crystal panel with a touch sensor function.

<figref idref="DRAWINGS">FIG. 5</figref> is an enlarged plan view illustrating a plan-view configuration in a display section of a CF substrate that composes the liquid crystal panel with a touch sensor function.

<figref idref="DRAWINGS">FIG. 6</figref> is a plan view illustrating an arrangement configuration of touch drive electrodes and touch detection electrodes.

<figref idref="DRAWINGS">FIG. 7</figref> is a diagram for explaining a shape of a slit provided in touch detection electrodes.

<figref idref="DRAWINGS">FIG. 8</figref> illustrates one exemplary arrangement of color filters.

<figref idref="DRAWINGS">FIG. 9</figref> is a diagram obtained by superposing the diagram of the touch detection electrode configuration illustrated in <figref idref="DRAWINGS">FIG. 7</figref> on the diagram of color filter arrangement illustrated in <figref idref="DRAWINGS">FIG. 8</figref>.

<figref idref="DRAWINGS">FIG. 10A</figref> is an enlarged view illustrating a part of the display screen when the entirety of the display screen is in a white color display state, in a case where the arrangement interval “a” for the slits is set to 1.000 time the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 10B</figref> is an enlarged view illustrating a part of the display screen when the entirety of the display screen is in a white color display state, in a case where the arrangement interval “a” for the slits is set to 1.225 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 10C</figref> is an enlarged view illustrating a part of the display screen when the entirety of the display screen is in a white color display state, in a case where the arrangement interval “a” for the slits is set to 1.250 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 10D</figref> is an enlarged view illustrating a part of the display screen when the entirety of the display screen is in a white color display state, in a case where the arrangement interval “a” for the slits is set to 1.500 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 10E</figref> is an enlarged view illustrating a part of the display screen when the entirety of the display screen is in a white color display state, in a case where the arrangement interval “a” for the slits is set to 1.725 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 10F</figref> is an enlarged view illustrating a part of the display screen when the entirety of the display screen is in a white color display state, in a case where the arrangement interval “a” for the slits is set to 2.000 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 11A</figref> is an enlarged view illustrating a part of the display screen when a black-and-white vertical stripe display is performed, in a case where the arrangement interval “a” for the slits is set to 1.725 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 11B</figref> is an enlarged view illustrating a part of the display screen when a black-and-white chessboard pattern display is performed, in a case where the arrangement interval “a” for the slits is set to 1.725 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 11C</figref> is an enlarged view illustrating a part of the display screen when an RCSB chessboard pattern display is performed, in a case where the arrangement interval “a” for the slits is set to 1.725 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 12A</figref> is a diagram for explaining a method for displaying a black-and-white vertical stripe display.

<figref idref="DRAWINGS">FIG. 12B</figref> is a diagram for explaining a black-and-white chessboard pattern display.

<figref idref="DRAWINGS">FIG. 12C</figref> is a diagram for explaining a black-and-white chessboard pattern display.

MODE FOR CARRYING OUT THE INVENTION

A touch sensor-equipped display device in one embodiment of the present invention includes: a display panel including a first substrate, a second substrate opposed to the first substrate, arid a display function layer interposed between the first substrate and the second substrate, the display function layer including a plurality of display pixels arranged in matrix; a touch drive electrode that is provided between the first substrate and the second substrate and extends in a first direction; and a touch detection electrode that is provided on a surface of the first substrate on a side opposite to the touch drive electrode, and extends in a second direction that intersects with the first direction at a right angle. In the touch sensor-equipped display device, a plurality of slits each of which is repeatedly bent in a zigzag shape while extending in the second direction are provided in the touch detection electrode so as to be arrayed in the first direction; an arrangement interval “a” for the slits adjacent in the first direction satisfies relationship given as:

<br /><i>a=b</i>×(0.725+<i>n</i>)×√3÷(2×cos θ)

where “b” represents an arrangement interval for the display pixels adjacent in the first direction, “θ” represents an angle of the slits with respect to the second direction as a reference direction, and “n” represents an integer equal to or greater than 0; and a turnback width of the slits in the zigzag shape is set to (a distance between centers of subpixels adjacent in the first direction among subpixels composing one display pixel)×{a natural number equal to or greater than (the number of colors of the subpixels +1)} (the first configuration).

With the first configuration, the occurrence of moire caused by the interference between the array pattern of subpixels and the pattern of the slits in the touch detection electrode can be suppressed, whereby the display quality of the display device can be improved.

In the first configuration, the slits have a width of 20 μm or less (the second configuration).

With the second configuration, the occurrence of moire can be suppressed, whereby the display quality of the display device can be improved.

In the first or second configuration, the arrangement interval “a” for the slits is 175 μm or less (the third configuration).

With the third configuration, the occurrence of moire can be suppressed, whereby the display quality of the display device can be improved.

In any one of the first to third configurations, the angle θ for the slits is in a range of 25° to 45° (the fourth configuration).

With the fourth configuration, the occurrence of moire can be suppressed, whereby the display quality of the display device can be improved.

Embodiment

The following describes embodiments of the present invention in detail, while referring to the drawings. Identical or equivalent parts in the drawings are denoted by the same reference numerals, and the descriptions of the same are not repeated. To make the description easy to understand, in the drawings referred to hereinafter, the configurations are simply illustrated or schematically illustrated, or the illustration of part of constituent members is omitted. Further, the dimension ratios of the constituent members illustrated in the drawings do not necessarily indicate the real dimension ratios.

<figref idref="DRAWINGS">FIG. 1</figref> illustrates a cross-sectional configuration of a touch sensor-equipped display device <b>10</b> in one embodiment. <figref idref="DRAWINGS">FIG. 2</figref> is a plan view illustrating the touch sensor-equipped display device <b>10</b> in one embodiment. The touch sensor-equipped display device <b>10</b> includes a liquid crystal panel <b>11</b> with a touch sensor function, a backlight device (lighting device) <b>13</b>, a bezel <b>14</b>, a case <b>15</b>, and a cover <b>16</b>. Regarding this touch sensor-equipped display device <b>10</b>, the side thereof on which the cover <b>16</b> is provided is the front side, and the side thereof on which the case <b>15</b> is provided is the rear side.

The liquid crystal panel <b>11</b> with a touch sensor function has a function of displaying an image, and a touch sensor function of detecting a touched position. More specifically, the liquid crystal panel <b>11</b> with a touch sensor function has a configuration that includes: a liquid crystal panel (display panel) that includes a pair of substrates and a display function layer provided between the substrates, the display function layer including a plurality of display pixels provided in matrix; touch drive electrodes provided between the pair of substrates of the liquid crystal panel; and touch detection electrodes provided on a front side of the substrate on the front side of the display panel.

The backlight device <b>13</b> is an external light source that emits light toward the liquid crystal panel <b>11</b> with a touch sensor function.

The cover <b>16</b> is arranged on an outer side of the liquid crystal panel <b>11</b> with a touch sensor function so as to protect the liquid crystal panel <b>11</b> with a touch sensor function. This cover <b>16</b> is made of a material that has excellent impact resistance, for example, tempered glass. The liquid crystal panel <b>11</b> with a touch sensor function, and the cover <b>16</b>, are bonded and integrated with each other with an approximately transparent adhesive (not shown) being interposed therebetween.

The bezel <b>14</b> holds the cover <b>16</b> and the liquid crystal panel <b>11</b> with a touch sensor function together, between the same and the backlight device <b>13</b>. The bezel <b>14</b> is attached to the case <b>15</b>, and the case <b>15</b> houses the backlight device <b>13</b>.

<figref idref="DRAWINGS">FIG. 3</figref> is a schematic cross-sectional view of the liquid crystal panel <b>11</b> with a touch sensor function. <figref idref="DRAWINGS">FIG. 4</figref> is an enlarged plan view illustrating a plan-view configuration in a display section of an array substrate that composes the liquid crystal panel <b>11</b> with a touch sensor function. <figref idref="DRAWINGS">FIG. 5</figref> is an enlarged plan view illustrating a plan-view configuration in a display section of a CF substrate that composes the liquid crystal panel <b>11</b> with a touch sensor function.

The liquid crystal panel <b>11</b> with a touch sensor function includes a pair of substrates <b>11</b><i>a </i>and <b>11</b><i>b </i>that are transparent (that have excellent translucency), and a liquid crystal layer <b>11</b><i>c </i>interposed between the substrates <b>11</b><i>a </i>and <b>11</b><i>b</i>, as illustrated in <figref idref="DRAWINGS">FIG. 3</figref>. The liquid crystal layer <b>11</b><i>c </i>contains liquid crystal molecules as a substance whose optical properties change in response to the application of an electric field. The substrates <b>11</b><i>a </i>and <b>11</b><i>b </i>are bonded with each other with a sealant (not shown) in a state in which a cell gap corresponding to the thickness of the liquid crystal layer <b>11</b><i>c </i>is maintained therebetween.

Each of the substrates <b>11</b><i>a </i>and <b>11</b><i>b </i>opposed to each other includes an approximately transparent glass substrate, and has such a configuration that a plurality of films are laminated on the glass substrate by a known photolithography method or the like. Among the substrates <b>11</b><i>a </i>and <b>11</b><i>b</i>, the CF substrate (first substrate) <b>11</b><i>a </i>is on the front side, and the array substrate (second substrate) <b>11</b><i>b </i>is on the rear side (back side).

On the inner side surfaces of the substrates <b>11</b><i>a </i>and <b>11</b><i>b</i>, alignment films <b>11</b><i>d </i>and <b>11</b><i>e </i>for aligning the liquid crystal molecules contained in the liquid crystal layer <b>11</b><i>c </i>are formed, respectively, as illustrated in <figref idref="DRAWINGS">FIG. 3</figref>. On the outer side surfaces of the substrates <b>11</b><i>a </i>and <b>11</b><i>b</i>, polarizing plates <b>11</b><i>f </i>and <b>11</b><i>g </i>are laminated, respectively.

On the inner side surface of the array substrate <b>11</b><i>b </i>(the liquid crystal layer <b>11</b><i>c </i>side, the side opposed to the CF substrate <b>11</b><i>a</i>), a plurality of thin film transistors (TFTs) <b>17</b>, which are switching elements, and a plurality of pixel electrodes <b>18</b>, are provided in matrix, as illustrated in <figref idref="DRAWINGS">FIGS. 3 and 4</figref>. Gate lines <b>19</b> and source lines <b>20</b> forming a lattice pattern are arranged so as to enclose these TFTs <b>17</b> and pixel electrodes <b>18</b>. In other words, at intersections of the gate lines <b>19</b> and the source lines <b>20</b> forming the lattice pattern, the TFTs <b>17</b> and the pixel electrodes <b>18</b> are arranged in parallel, so as to be arranged in matrix.

The gate lines <b>19</b> and the source lines <b>20</b> are connected to the gate electrodes and the source electrodes of the TFTs <b>17</b>, respectively, and the pixel electrodes <b>18</b> are connected to the drain electrodes of the TFTs <b>17</b>. Further, each pixel electrode <b>18</b> is in a portrait oriented rectangular shape when viewed in a plan view, and is formed with a translucent conductive film made of a material having excellent translucency and conductivity, such as indium tin oxide (ITO) or zinc oxide (ZnO).

On the other hand, as illustrated in <figref idref="DRAWINGS">FIGS. 3 and 5</figref>, color filters <b>11</b><i>h </i>are provided in matrix on the CF substrate <b>11</b><i>a</i>, in such a manner that the color portions in colors of red (R), green (G), blue (B) and the like overlap the pixel electrodes <b>18</b> on the array substrate <b>11</b><i>b </i>side when viewed in a plan view. Between the respective color portions that form the color filter <b>11</b><i>h, </i>a light-shielding layer (black matrix) <b>11</b><i>i </i>in a lattice pattern for preventing the color mixing is formed. The light-shielding layer <b>11</b><i>i </i>is arranged so as to overlap the above-described gate lines <b>19</b> and the source lines <b>20</b> when viewed in a plan view. Over an entire surface of the color filters <b>11</b><i>h </i>and the light-shielding layer <b>11</b><i>i, </i>a counter electrode <b>11</b><i>j </i>is provided, which is opposed to the pixel electrodes <b>18</b> on the array substrate <b>11</b><i>b </i>side.

In this liquid crystal panel <b>11</b> with a touch sensor function, as illustrated in <figref idref="DRAWINGS">FIGS. 3 to 5</figref>, one display pixel as a display unit is composed of a set of the color portions in the three colors of R (red), G (green), and B (blue) and the three pixel electrodes <b>18</b> opposed to the color portions, respectively. The display pixel is composed of a red color subpixel having a color portion of R, a green color subpixel having a color portion of G, and a blue color subpixel having a color portion of B. These subpixels of the respective colors are arranged side by side repeatedly in the row direction (X axis direction) on the plate surface of the liquid crystal panel <b>11</b>, thereby forming a pixel group, and a multiplicity of such pixel groups are arrayed in the column direction (Y axis direction). In other words, a plurality of the display pixels are arranged in matrix. In the present embodiment, the subpixels are arranged in a so-called stripe array.

The following describes the touch sensor function. The liquid crystal panel <b>11</b> with a touch sensor function includes touch drive electrodes <b>61</b> and touch detection electrodes <b>62</b> that compose the touch sensor. As illustrated in <figref idref="DRAWINGS">FIG. 3</figref>, the touch drive electrodes <b>61</b> are provided on the back side (the liquid crystal layer <b>11</b><i>c </i>side) of the CF substrate <b>11</b><i>a</i>, and the touch detection electrodes <b>62</b> are provided on the front side of the CF substrate <b>11</b><i>a</i>. More specifically, the touch drive electrodes <b>61</b> are provided between the CF substrate <b>11</b><i>a </i>on one hand and the color filters <b>11</b><i>h </i>and the light-shielding layer <b>11</b><i>i </i>on the other hand. Further, the touch detection electrodes <b>62</b> are provided between the CF substrate <b>11</b><i>a </i>and the polarizing plate <b>11</b><i>f. </i>This touch sensor is of the so-called projection type electrostatic capacitance method, and the detection method thereof is of the mutual capacitance type.

<figref idref="DRAWINGS">FIG. 6</figref> is a plan view illustrating the arrangement configuration of the touch drive electrodes <b>61</b> and the touch detection electrodes <b>62</b>. A plurality of touch drive electrodes <b>61</b> extending in the X axis direction are provided so as to be arrayed in the Y axis direction at predetermined intervals. Further, a plurality of touch detection electrodes <b>62</b> extending in the Y axis direction are provided so as to be arrayed in the X axis direction at predetermined intervals. The touch drive electrodes <b>61</b> and the touch detection electrodes <b>62</b> are formed with translucent conductive films made of a material having excellent translucency and conductivity, such as indium tin oxide (ITO) or zinc oxide (ZnO).

The following simply explains a method for detecting a touched position. The touch drive electrodes <b>61</b> are sequentially scanned so that an input signal is input thereto, and output signals output from the touch detection electrodes <b>62</b> are detected. When any area of the surface of the touch sensor-equipped display device <b>10</b> is touched, the electrostatic capacitance between the touch drive electrode <b>61</b> and the touch detection electrode <b>62</b> at the touched position changes. Based on an output signal output from the touch detection electrode <b>62</b>, the position where the electrostatic capacitance has changed is detected, and the detected position is identified as the touched position.

Between the plurality of the touch detection electrodes <b>62</b> provided on the front side of the CF substrate <b>11</b><i>a</i>, the dummy electrodes <b>63</b> are provided. In other words, in each space between adjacent ones of the plurality of touch detection electrodes <b>62</b> arrayed in the X axis direction at predetermined intervals, a plurality of dummy electrodes <b>63</b> extending in the Y axis direction are provided.

The dummy electrodes <b>63</b> are provided for the purpose of preventing the light transmission rate and the like from becoming different between the positions where the touch detection electrodes <b>62</b> are provided and the positions where they are not provided, on the front side of the CF substrate <b>11</b><i>a</i>. The dummy electrodes <b>63</b>, therefore, are formed with conductive films made of the same material as that of the touch detection electrodes <b>62</b>, that is, a material having excellent translucency, such as ITO or ZnO. It should be noted that the dummy electrodes <b>63</b> are not connected with other lines or electrodes, and are in an electrically floating state.

The touch detection electrodes <b>62</b> and the dummy electrodes <b>63</b> have predetermined refractive indices, though they are transparent. In the touch detection electrodes <b>62</b> and the dummy electrodes <b>63</b>, therefore, a plurality of slits are provided so as to make the touch detection electrodes <b>62</b> and the dummy electrodes <b>63</b> unnoticeable when the touch sensor-equipped liquid crystal display device <b>10</b> is viewed.

<figref idref="DRAWINGS">FIG. 7</figref> is a diagram for explaining the shape of slits provided in the touch detection electrodes <b>62</b>. It should be noted that slits in the identical shape are provided in the dummy electrodes <b>63</b>, though the illustration of the same is omitted.

The touch detection electrode <b>62</b> is composed of a plurality of electrode portions <b>621</b> formed with translucent conductive films, and a plurality of slits <b>622</b> provided between the plurality of electrode portions <b>621</b>. Each slit <b>622</b> is repeatedly bent in a zigzag shape, while extending in the Y axis direction as an entire slit. In other words, each slit <b>622</b> is composed of first direction linear portions <b>622</b><i>a </i>extending in a first direction, and second direction linear portions <b>622</b><i>b </i>extending in a second direction that is different from the first direction. Here, the first direction linear portions <b>622</b><i>a </i>and the second direction linear portions <b>622</b><i>b </i>have the same width in the X axis direction, and the same length in the Y axis direction.

In the present embodiment, an arrangement interval “a” for the slits <b>622</b> adjacent in the X axis direction in a plan view satisfies the relationship given as the following expression (1):

<br /><i>a=b</i>×(0.725+<i>n</i>)×√3÷(2×cos θ)   (1)

where “b” represents an arrangement interval for a plurality of the display pixels adjacent in the X axis direction in a plan view, “θ” represents an angle of the slit <b>622</b> with respect to the Y axis direction as a reference direction, and “n” represents an integer equal to or greater than 0 (n=0, 1, 2, . . . ).

Further, the turnback width “c” of the slit <b>622</b> in the zigzag shape is set to (the distance between the centers of the subpixels adjacent in the X axis direction among the plurality of subpixels composing one display pixel)×{a natural number equal to or greater than (the number of colors of the subpixels+1)}. The turnback width “c” of the slit <b>622</b> is a width of the first direction linear portion <b>622</b><i>a </i>(or the second direction linear portion <b>622</b><i>b</i>) in the X axis direction. For example, in a case where the subpixels correspond to the three colors of R (red), G (green), and B (blue), the turnback width “c” of the slit <b>622</b> is assumed to be {(the distance between the centers of the subpixels)×(a natural number equal to or greater than 4)}. In the present embodiment, the turnback width “c” of the slit <b>622</b> is set to {(the distance between the centers of the subpixels)×4}.

It is preferable that the width “d” of the slit <b>622</b> in the X axis direction is 20 μm or less. Further, it is preferable that the arrangement interval “a” of the slits <b>622</b> adjacent in the X axis direction is 175 μm or less.

The angle θ of the slit <b>622</b> is preferably 25° to 45°, and is set to 30° in the present embodiment.

<figref idref="DRAWINGS">FIG. 8</figref> illustrates one exemplary arrangement of color filters <b>11</b><i>h. </i>Further, <figref idref="DRAWINGS">FIG. 9</figref> is a diagram obtained by superposing the diagram of a configuration of the touch detection electrode <b>62</b> illustrated in <figref idref="DRAWINGS">FIG. 7</figref>, on the diagram of color filter arrangement illustrated in <figref idref="DRAWINGS">FIG. 8</figref>. <figref idref="DRAWINGS">FIG. 9</figref> illustrates the arrangement interval “a” for the slits <b>622</b>, and the arrangement interval “b” for the display pixels as well. It should be noted that the arrangement interval “a” for the slits <b>622</b> is the arrangement interval in a case where n=1 and θ=30° in the expression (1), that is, 1.725 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIGS. 10A to 10F</figref> illustrate differences in appearance of the display screen when the arrangement interval “a” for the slits <b>622</b> is varied with respect to the arrangement interval “b” for the display pixels. Each of <figref idref="DRAWINGS">FIGS. 10A to 10F</figref> is an enlarged view illustrating a part of the display screen when white color display is performed in the entire display screen. In <figref idref="DRAWINGS">FIGS. 10A to 10F</figref>, the arrangement interval “a” for the slits <b>622</b> is set to 1.000 time, 1.225 times, 1.250 times, 1.500 times, 1.725 times, and 2.000 times the arrangement interval “b” for the display pixels, respectively.

In the case where the arrangement interval “a” for the slits <b>622</b> is set to 1.000 time the arrangement interval “b” for the display pixels, wide horizontal lines are visible as moire, as illustrated in <figref idref="DRAWINGS">FIG. 10A</figref>. In the case where the arrangement interval “a” for the slits <b>622</b> is set to 1.225 times or 1.250 times the arrangement interval “b” for the display pixels, thin diagonal lines are visible as moire, as illustrated in <figref idref="DRAWINGS">FIG. 10B</figref> or <figref idref="DRAWINGS">FIG. 10C</figref>. In the case where the arrangement interval “a” for the slits <b>622</b> is set to 1.500 times or 2.000 times the arrangement interval “b” for the display pixels, wide horizontal lines are visible as moire, as illustrated in <figref idref="DRAWINGS">FIG. 10D</figref> or <figref idref="DRAWINGS">FIG. 10F</figref>.

On the other hand, in the case where the arrangement interval “a” for the slits <b>622</b> is set to 1.725 times the arrangement interval “b” for the display pixels so as to satisfy the relationship given as the expression (1), clear moire is not seen as illustrated in <figref idref="DRAWINGS">FIG. 10E</figref>.

<figref idref="DRAWINGS">FIG. 10E</figref> illustrates the appearance of the display screen when the arrangement interval “a” for the slits <b>622</b> is set so as to satisfy the expression (1) and white color display is performed in the entire display screen. The following also describes the appearance of the display screen in a case where the arrangement interval “a” for the slits <b>622</b> is set so as to satisfy the following expression (1), and display other than the white color display is performed.

<figref idref="DRAWINGS">FIGS. 11A to 11C</figref> are enlarged views illustrating a part of the display screen in cases where the arrangement interval “a” for the slits <b>622</b> is set so as to satisfy the expression (1) and displays illustrated in <figref idref="DRAWINGS">FIGS. 17A to 17C</figref> are performed. Here, also, the arrangement interval “a” for the slits <b>622</b> is set to the interval in the case where n=1 and θ=30° in the expression (1), that is, set to 1.725 times the arrangement interval “b” for the display pixels.

<figref idref="DRAWINGS">FIG. 11A</figref> illustrates a display screen in a case where a black-and-white vertical stripe display is performed (corresponding to <figref idref="DRAWINGS">FIG. 12A</figref>), <figref idref="DRAWINGS">FIG. 11B</figref> illustrates a display screen in a case where a black-and-white chessboard pattern display is performed (corresponding to <figref idref="DRAWINGS">FIG. 12B</figref>), and <figref idref="DRAWINGS">FIG. 11C</figref> illustrates a display screen in a case where an RGB chessboard pattern display is performed (corresponding to <figref idref="DRAWINGS">FIG. 12C</figref>). In a case where the arrangement interval “a” for the slits <b>622</b> is set so as to satisfy the expression (1), clear moire is not seen, in any one of the case where the black-and-white vertical stripe display (<figref idref="DRAWINGS">FIG. 11A</figref>) is performed, the case where the black-and-white chessboard pattern display (<figref idref="DRAWINGS">FIG. 11B</figref>) is performed, and the case where the RGB chessboard pattern display (<figref idref="DRAWINGS">FIG. 11C</figref>) is performed, as is the case where white color display is performed in the entire display screen (<figref idref="DRAWINGS">FIG. 10E</figref>).

The present invention is not limited to the above-described embodiment. For example, the foregoing description refers to a liquid crystal panel as an exemplary display panel in which a display function layer including a plurality of display pixels arranged in matrix is provided between a pair of substrates, but the display panel may be another display panel such as an organic electroluminescence (EL) panel including organic EL elements.

<br /><i>a=b</i>×(0.725+<i>n</i>)×√3÷(2×cos θ)

In the foregoing description, the colors of the subpixels are three colors of R (red), G (green), and B (blue), but the colors may be four colors of R (red), G (green), B (blue), and Y (yellow), or alternatively, five or more colors.

The touch sensor-equipped display device in the present embodiment is used in various types of electronic devices such as mobile phones (including smartphones), notebook computers (including tablet-type notebook computers), portable information terminals (including electronic books and PDAs), digital photoframes, and portable game machines.

DESCRIPTION OF REFERENCE NUMERALS

<ul id="ul0002" list-style="none"><li id="ul0002-0001" num="0072"><b>10</b> . . . touch sensor-equipped display device</li><li id="ul0002-0002" num="0073"><b>11</b> . . . touch sensor-equipped liquid crystal panel</li><li id="ul0002-0003" num="0074"><b>11</b><i>a </i>. . . CF substrate</li><li id="ul0002-0004" num="0075"><b>11</b><i>b </i>. . . array substrate</li><li id="ul0002-0005" num="0076"><b>61</b> . . . touch drive electrode</li><li id="ul0002-0006" num="0077"><b>62</b> . . . touch detection electrode</li><li id="ul0002-0007" num="0078"><b>622</b> . . . slit</li></ul>