JP2010085854A - Electrooptical apparatus, light detecting apparatus, and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To favorably detect a light emitted from an illuminating apparatus without forming a reflecting layer on a back side of a light sensor. <P>SOLUTION: An electrooptical apparatus (100) includes a display panel (30) having a first substrate (91) and a second substrate (92), and a light source (10), and the display panel includes a first light receiving element (61) and a second light receiving element (62) that are formed on the first substrate, the reflecting layer (81) that reflects a light which is formed on the second substrate and emitted from the light source, toward the first light receiving element, and a colored layer (6a) that is formed on a light path where the light emitted from the light source enters the reflecting layer or on a light path where the light reflected by the reflecting layer enters the first light receiving element. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technical field of, for example, an electro-optical device such as a liquid crystal device, a light detection device including an optical sensor used in such an electro-optical device, and an electronic apparatus including such an electro-optical device.

  An example of an electro-optical device is a liquid crystal device in which liquid crystal is sandwiched between a pair of substrates as an electro-optical material. In such a liquid crystal device, for example, the liquid crystal is set in a predetermined alignment state between a pair of substrates constituting the liquid crystal panel, and for example, a predetermined voltage is applied to the liquid crystal for each pixel portion formed in the image display region. The gradation display is performed by modulating the light by changing the orientation and order in the liquid crystal.

  In such a liquid crystal device, an illumination device (that is, a backlight) is provided on the back side of the liquid crystal panel in order to perform transmissive display. An illuminating device having LEDs (Light Emitting Diodes) of red, green, and blue as light sources generates white light by mixing light emitted from the LEDs, and the generated white light is a liquid crystal panel. Irradiate the back side of. The liquid crystal device realizes color display by transmitting the white light emitted from the lighting device through a color filter that transmits light of each wavelength of red, green, and blue stacked on the substrate of the liquid crystal panel. is doing.

  However, the LED of each color has a property that the luminance characteristic is greatly changed due to a temperature change or a change with time, so that there is a problem that the color of the mixed white light also changes. For this reason, Patent Document 1 discloses a light source composed of LEDs of each color of RGB, a photosensor formed on a TFT array substrate provided in a display panel, and a reflective layer formed on a counter substrate facing the photosensor. And a coloring layer, and a liquid crystal device including a control unit that adjusts the luminance of each LED included in the light source based on a detection value of the light sensor (that is, a detection value of light reflected from the reflection layer). ing. In this liquid crystal device, light emitted from the light source is reflected by the reflective layer and transmitted through the colored layer to become light of a predetermined color, and then enters the optical sensor. As a result, the luminance of light of a predetermined color (that is, the luminance of an LED that emits light of a predetermined color) can be adjusted.

JP 2007-212712 A

  However, in the liquid crystal device described in Patent Document 1 described above, in order to make only the light reflected from the reflection layer out of the light emitted from the illumination device enter the photosensor (in other words, emitted from the illumination device). In order to prevent light from directly entering the photosensor), it is necessary to separately form a new reflective layer on the back side of the photosensor (that is, the lighting device side).

  The present invention has been made in view of, for example, the conventional problems described above. For example, an electro-optical device and a light that suitably detect light emitted from an illumination device without forming a reflective layer on the back side of the optical sensor. It is an object to provide a detection device and an electronic device.

(Electro-optical device)
In order to solve the above-described problem, an electro-optical device according to the present invention includes a display panel having a first substrate and a second substrate facing the first substrate, and light from the first substrate side toward the display panel. The display panel includes a first light receiving element and a second light receiving element formed on the first substrate, and light emitted from the light source formed on the second substrate. A reflective layer that reflects toward the first light receiving element, and an optical path where light emitted from the light source enters the reflective layer or an optical path where light reflected by the reflective layer enters the first light receiving element And a colored layer.

  According to the electro-optical device of the present invention, the light emitted from the light source is visually recognized by the user after passing through the display panel so as to propagate from the first substrate side toward the second substrate side. Thereby, a desired image can be displayed. An example of such an electro-optical device is an electro-optical device in which an electro-optical material (for example, liquid crystal) is sandwiched between a first substrate and a second substrate. In such an electro-optical device, an image is displayed by applying an electric field according to an image to the electro-optical material.

  Particularly in the present invention, the display panel includes a first light receiving element and a second light receiving element, a reflective layer, and a colored layer.

  Each of the first light receiving element and the second light receiving element is a light receiving element that receives light emitted from the light source. At this time, it is preferable that each of the first light receiving element and the second light receiving element outputs a light receiving current corresponding to the light received. On the other hand, each of the first light receiving element and the second light receiving element is preferably formed so as not to receive light emitted from other than the light source (for example, ambient light incident from the outside of the electro-optical device). The first light receiving element and the second light receiving element are formed on the first substrate (more preferably, on the surface of the first substrate on the second substrate side). Accordingly, each of the first light receiving element and the second light receiving element directly receives light emitted from the light source. That is, each of the first light receiving element and the second light receiving element directly receives light emitted from the light source and transmitted through the first substrate. Each of the first light receiving element and the second light receiving element may be a light receiving element having the same configuration, or may be a light receiving element having a different configuration.

  The reflective layer is formed on the second substrate. For this reason, the light from the light source incident from the first substrate side passes through the first substrate and then reaches the second substrate and then is reflected by the reflective layer, so that the light again enters the first substrate side. Propagate. At this time, the reflection layer is configured to reflect the light emitted from the light source toward the first light receiving element. In such a configuration, a reflective layer is typically formed in a region facing the first light receiving element (in other words, a region overlapping with the first light receiving element along the normal direction of the first substrate or the second substrate). Is realized. Therefore, the light reflected by the reflective layer is detected by the first light receiving element. On the other hand, the reflective layer preferably does not reflect the light emitted from the light source toward the second light receiving element. Therefore, it is preferable that the light reflected by the reflective layer is not detected by the second light receiving element.

  The colored layer is formed on an optical path (that is, an optical path between the light source and the reflective layer) where light emitted from the light source enters the reflective layer. Alternatively, the colored layer is formed on an optical path (that is, an optical path between the reflective layer and the first light receiving element) where the light reflected by the reflective layer enters the first light receiving element. Typically, the colored layer is formed in a region facing the first light receiving element (in other words, a region overlapping with the first light receiving element along the normal direction of the first substrate or the second substrate). preferable. Moreover, it is preferable that the colored layer is typically formed on the reflective layer. Accordingly, the light emitted from the light source is reflected by the reflective layer and passes through the colored layer, thereby becoming light of a predetermined color. The predetermined color light is incident on the first light receiving element. For this reason, the first light receiving element directly receives the light emitted from the light source and transmitted through the first substrate, and further receives light of a predetermined color among the light emitted from the light source.

  For this reason, the first light receiving element has a predetermined value among a thermal current corresponding to the environmental temperature of the first light receiving element, a light receiving current generated by directly receiving light emitted from the light source, and light emitted from the light source. Each of the received light currents generated by receiving the light of the color of is generated. On the other hand, in the second light receiving element, a thermal current corresponding to the environmental temperature of the second light receiving element and a light receiving current generated by directly receiving light emitted from the light source are generated. Accordingly, the detection circuit described later includes a light reception result in the first light receiving element (that is, a thermal current corresponding to the environmental temperature of the first light receiving element, a light receiving current generated by directly receiving light emitted from the light source, and a light source. Light received from a light of a predetermined color among the light emitted from the light, and a light reception result in the second light receiving element (that is, a thermal current corresponding to the ambient temperature of the second light receiving element and the light emitted from the light source) "Light reception current generated by receiving light of a predetermined color out of light emitted from the light source", which is a difference from the light reception current generated by directly receiving the received light.

  Here, in the configuration in which a light component of a predetermined color is detected using a single light receiving element as in the configuration disclosed in Patent Document 1 described above, light emitted from the light source is directly received. In order to prevent the generated light receiving current from being generated in the light receiving element, it is necessary to provide a reflective layer on the back side (that is, the light source side) of the light receiving element. However, in the present invention, two light receiving elements are provided, and light of a predetermined color is incident on one of the two light receiving elements (that is, the first light receiving element) via the reflective layer and the colored layer. For this reason, even if a reflective layer or the like is not provided on the back side (that is, the light source side) of each of the first light receiving element and the second light receiving element, light of a predetermined color (more specifically, light emitted from the light source) For example, the amount of light of a predetermined color and the brightness can be detected suitably.

  In addition, in a configuration in which light of a predetermined color is detected using a single light receiving element, a thermal current corresponding to the ambient temperature of the light receiving element is generated, and thus light reception generated by receiving light of a predetermined color It is difficult to detect the current itself with high accuracy. However, in the present invention, since the two light receiving elements are provided, the influence of the thermal current can be suitably or reliably eliminated as described above. Therefore, the light of a predetermined color among the light emitted from the light source can be detected with high accuracy.

  In one aspect of the electro-optical device of the present invention, the reflective layer is formed in a region of the second substrate facing the first light receiving element.

  According to this aspect, the reflective layer can reliably reflect the light emitted from the light source toward the first light receiving element. Further, the reflective layer reflects little or no light emitted from the light source toward the second light receiving element. Alternatively, the reflective layer reflects light emitted from the light source toward the second light receiving element only to the extent that it does not adversely affect the highly accurate detection of light of a predetermined color. Accordingly, it is not necessary to provide a reflective layer or the like on the back side (that is, the light source side) of each of the first light receiving element and the second light receiving element, and light of a predetermined color can be detected with high accuracy.

  In the aspect of the electro-optical device in which the reflective layer is formed in the region facing the first light receiving element of the second substrate as described above, the colored layer is formed in the region facing the first light receiving element of the second substrate. You may comprise.

  If comprised in this way, the light which permeate | transmitted the colored layer can be suitably entered in a 1st light receiving element. Further, the light transmitted through the colored layer is hardly or not incident on the second light receiving element. Or the light which permeate | transmitted the colored layer will inject into a 2nd light receiving element only to such an extent that it does not have a bad influence with respect to the highly accurate detection of the light of a predetermined color. Therefore, light of a predetermined color can be detected with high accuracy.

  In the aspect of the electro-optical device in which the reflective layer is formed in the region facing the first light receiving element of the second substrate as described above, the reflective layer and the colored layer are not formed in the region facing the second light receiving element. You may comprise as follows.

  If comprised in this way, the light radiate | emitted from a light source will hardly be reflected toward the 2nd light receiving element, or it will be none. Alternatively, the reflective layer reflects light emitted from the light source toward the second light receiving element only to the extent that it does not adversely affect the highly accurate detection of light of a predetermined color. In addition, the light transmitted through the colored layer is hardly or not incident on the second light receiving element. Or the light which permeate | transmitted the colored layer will inject into a 2nd light receiving element only to such an extent that it does not have a bad influence with respect to the highly accurate detection of the light of a predetermined color. Therefore, light of a predetermined color can be detected with high accuracy.

  In another aspect of the electro-optical device of the present invention, a light-shielding layer that shields light incident from the opposite side of the second substrate from the light source and does not reflect light from the light source is provided on the second substrate. The reflective layer is formed on the first substrate side of the light shielding layer.

  According to this aspect, since the light shielding layer that does not transmit and reflect light is provided, the first light receiving element has light emitted from other than the light source (for example, ambient light incident from the outside of the electro-optical device, etc. ) Is not incident. Accordingly, the light emitted from the light source and the light of a predetermined color out of the light emitted from the light source (that is, the light reflected by the reflective layer and transmitted through the colored layer) enter the first light receiving element. Can be realized reliably. Similarly, since the light shielding layer is provided, light emitted from other than the light source (for example, ambient light incident from the outside of the electro-optical device) does not enter the second light receiving element. In addition, since the light emitted from the light source is not reflected by the light shielding layer, the state in which the light emitted from the light source enters the second light receiving element can be reliably realized. Therefore, as described above, “a light receiving current generated by receiving light of a predetermined color out of the light emitted from the light source, which is the difference between the light receiving result in the first light receiving element and the light receiving result in the second light receiving element”. "Can be output reliably.

  In another aspect of the electro-optical device of the invention, the colored layer is formed on the first substrate side of the reflective layer.

  According to this aspect, since the light reflected by the reflective layer or the light incident on the reflective layer is surely transmitted through the colored layer, the light of a predetermined color out of the light emitted from the light source (that is, The state in which the light reflected by the reflective layer and transmitted through the colored layer is incident on the first light receiving element can be reliably realized.

  In another aspect of the electro-optical device according to the aspect of the invention, the light source emits red light, green light, and blue light, and the first light receiving element includes a red light receiving element and a green light receiving light. A light-receiving element for blue light, and the colored layer is formed on an optical path where light reflected by the reflective layer enters the light-receiving element for red light and corresponds to red, Light that is formed on an optical path where light reflected by the reflective layer enters the light receiving element for green light and light that is reflected by the green colored layer corresponding to green and the reflective layer enters the light receiving element for blue light It includes a blue colored layer formed on the road and corresponding to blue.

  According to this aspect, the red light receiving element of the first light receiving elements directly receives light emitted from the light source and transmitted through the first substrate, and red light of the light emitted from the light source. The light is further received. Similarly, the green light receiving element of the first light receiving elements directly receives the light emitted from the light source and transmitted through the first substrate, and further receives the green light of the light emitted from the light source. Receive light. Similarly, the blue light receiving element of the first light receiving elements directly receives the light emitted from the light source and transmitted through the first substrate, and further receives the blue light of the light emitted from the light source. Receive light.

  Accordingly, the detection circuit described later receives “red light of the light emitted from the light source, which is the difference between the light reception result of the red light receiving element of the first light receiving element and the light reception result of the second light receiving element. Is received ”. Similarly, in the detection circuit described later, “the green light of the light emitted from the light source is the difference between the light reception result of the green light receiving element of the first light receiving element and the light reception result of the second light receiving element. A light receiving current generated by receiving light is output. Similarly, in the detection circuit described later, “the blue light of the light emitted from the light source is the difference between the light reception result of the blue light receiving element of the first light receiving element and the light reception result of the second light receiving element. A light receiving current generated by receiving light is output. For this reason, it is possible to individually detect red light, green light and blue light emitted from the light source.

  In another aspect of the electro-optical device of the present invention, the light source emits white light, and the first light receiving element includes a red light receiving element, a green light receiving element, and a blue light receiving element. The colored layer is formed on an optical path where light reflected by the reflective layer is incident on the light receiving element for red light, and the red colored layer corresponding to red, and the light reflected by the reflective layer is green A blue color formed on an optical path incident on the light receiving element for light and reflected on the green colored layer corresponding to green and the reflection layer formed on an optical path incident on the light receiving element for blue light and corresponding to blue Contains a colored layer.

  According to this aspect, the red light receiving element of the first light receiving elements directly receives light emitted from the light source and transmitted through the first substrate, and red light of the light emitted from the light source. The light is further received. Similarly, the green light receiving element of the first light receiving elements directly receives the light emitted from the light source and transmitted through the first substrate, and further receives the green light of the light emitted from the light source. Receive light. Similarly, the blue light receiving element of the first light receiving elements directly receives the light emitted from the light source and transmitted through the first substrate, and further receives the blue light of the light emitted from the light source. Receive light.

  Accordingly, the detection circuit described later receives “red light of the light emitted from the light source, which is the difference between the light reception result of the red light receiving element of the first light receiving element and the light reception result of the second light receiving element. Is received ”. Similarly, in the detection circuit described later, “the green light of the light emitted from the light source is the difference between the light reception result of the green light receiving element of the first light receiving element and the light reception result of the second light receiving element. A light receiving current generated by receiving light is output. Similarly, in the detection circuit described later, “the blue light of the light emitted from the light source is the difference between the light reception result of the blue light receiving element of the first light receiving element and the light reception result of the second light receiving element. A light receiving current generated by receiving light is output. For this reason, it is possible to individually detect red light, green light, and blue light included in white light emitted from the light source.

  In the aspect in which the colored layer includes a red colored layer, a green colored layer, and a blue colored layer, typically, the red colored layer is a region facing the red light receiving element (in other words, the first substrate or the second substrate). It is preferable that it is formed in a region overlapping the red light receiving element) along the normal direction. Similarly, the green colored layer is preferably formed in a region facing the green light receiving element (in other words, a region overlapping with the green light receiving element along the normal direction of the first substrate or the second substrate). Similarly, the blue colored layer is preferably formed in a region facing the blue light receiving element (in other words, a region overlapping with the blue light receiving element along the normal direction of the first substrate or the second substrate).

  Further, in an aspect in which the colored layer includes a red colored layer, a green colored layer, and a blue colored layer, the colored layer is configured such that light emitted from the light source emits light to the reflective layer (particularly, the red light receiving element). A red colored layer corresponding to red, which is formed on an optical path incident on a reflective layer that reflects light, and a light that is emitted from the light source reflects light to the reflective layer (particularly, the green light receiving element). The green colored layer corresponding to green and the light emitted from the light source is incident on the reflective layer (particularly, the reflective layer that reflects light to the blue light receiving element). It may be configured to include a blue colored layer formed on the optical path and corresponding to blue.

  In another aspect of the electro-optical device of the present invention, the predetermined color of the light emitted from the light source is based on a difference between a light reception result of the first light receiving element and a light reception result of the second light receiving element. A detection circuit for detecting a light component is further provided.

  According to this aspect, the light reception current generated by receiving the light of a predetermined color among the light emitted from the light source, which is the difference between the light reception result in the first light receiving element and the light reception result in the second light receiving element. ”, It is possible to suitably detect light of a predetermined color emitted from the light source.

  In another aspect of the electro-optical device of the present invention, the electro-optical device further includes an adjustment circuit that controls luminance of the light source based on a difference between a light reception result of the first light receiving element and a light reception result of the second light receiving element.

  According to this aspect, the light reception current generated by receiving the light of a predetermined color among the light emitted from the light source, which is the difference between the light reception result in the first light receiving element and the light reception result in the second light receiving element. The luminance of the light source (in particular, the luminance of light of a predetermined color emitted from the light source) can be suitably adjusted.

(Photodetection device)
In order to solve the above-described problems, a photodetection device of the present invention includes a display panel having a first substrate and a second substrate facing the first substrate, and light from the first substrate side toward the display panel. A light detection device used in an electro-optical device including a light source that emits light, the first light receiving element and the second light receiving element formed on the first substrate, the second light receiving element formed on the second substrate, and the A reflective layer that reflects light emitted from a light source toward the first light receiving element, and light that is reflected on or reflected by the reflective layer on an optical path where the light emitted from the light source enters the reflective layer. And a colored layer formed on an optical path incident on the light receiving element and corresponding to a predetermined color.

  According to the light detection device of the present invention, similarly to the electro-optical device of the present invention described above, a reflective layer or the like is not provided on the back side (that is, the light source side) of each of the first light receiving element and the second light receiving element. The light of a predetermined color among the light emitted from the light source can be suitably detected. In addition, since the influence of the thermal current can be suitably or reliably eliminated, it is possible to detect light of a predetermined color among the light emitted from the light source with high accuracy.

  Incidentally, in response to the various aspects that can be adopted by the electro-optical device of the present invention described above, the light detection apparatus of the present invention can also adopt various aspects.

(Electronics)
In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention (including various aspects thereof).

  According to the electronic apparatus of the present invention, since the electro-optical device (or various aspects thereof) of the present invention described above is provided, the same effects as those received by the electro-optical device of the present invention described above can be obtained. Can do. That is, a projection display device (for example, a projector) or a direct-view display device (for example, a television, a mobile phone, an electronic notebook) that can enjoy the same effects as those of the above-described electro-optical device of the present invention. Various electronic devices such as portable audio players, word processors, digital cameras, viewfinder type or monitor direct view type video recorders, workstations, videophones, POS terminals, touch panels, and the like can be realized.

  The operation and other advantages of the present invention will become more apparent from the embodiments described below.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following description, a liquid crystal device is used as an example of the electro-optical device according to the invention.

(1) Basic Configuration of Liquid Crystal Display Device First, the configuration of the liquid crystal display device 100 according to the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a plan view schematically showing a schematic configuration of a liquid crystal display device 100 according to the present embodiment. In FIG. 1, a color filter substrate 92 is disposed on the front side (observation side) of the paper, and an element substrate 91 is disposed on the back side of the paper. In FIG. 1, the vertical direction (column direction) on the paper surface is defined as the Y direction, and the horizontal direction (row direction) on the paper surface is defined as the X direction. In FIG. 1, each region corresponding to R (red), G1 (green 1), B (blue), and G2 (green 2) represents one sub-pixel SG, and R, G1, B, A sub-pixel SG of 1 row and 4 columns corresponding to G2 represents one display pixel AG. Here, G1 (green 1) and G2 (green 2) are two kinds of hues selected from hues from blue to yellow. In the present embodiment, as an example, G1 (green 1) generally indicates pure green indicated by G, and G2 (green 2) indicates yellowish green. However, the arrangement of the sub-pixels SG is not limited to the example shown in FIG.

  FIG. 2 is an enlarged cross-sectional view of one display pixel AG along the cutting line A-A ′ in the liquid crystal display device 100. As shown in FIG. 2, the liquid crystal display device 100 includes an illumination device 10, a liquid crystal display panel 30, a diffusion sheet 14, a prism sheet 15, and a reflection sheet 16. The liquid crystal display panel 30 is an element substrate 91 that constitutes a specific example of the “first substrate” in the present invention, and a specific example of the position of the “second substrate” in the present invention that is disposed to face the element substrate 91. The constituent color filter substrate 92 is bonded to each other through a frame-shaped sealing material 5, and liquid crystal is sealed inside the sealing material 5 to form the liquid crystal layer 4. The liquid crystal used for the liquid crystal layer 4 is, for example, a TN (Twisted Nematic) type liquid crystal. The illumination device 10 is provided on the outer surface of the element substrate 91 of the liquid crystal display panel 30.

  The liquid crystal display device 100 according to this embodiment is a color display liquid crystal display device configured using four colors of R, G1, B, and G2, and uses a low-temperature polysilicon TFT as a switching element. This is an active matrix liquid crystal display device.

  A planar configuration of the element substrate 91 will be described. On the inner surface of the element substrate 91, a plurality of source lines 32, a plurality of gate lines 33, a plurality of polysilicon TFTs 37, a plurality of pixel electrodes 34, a driver IC 40, an external connection wiring 35, and an FPC (Flexible Printed Circuit). 41 or the like is formed or mounted.

  As shown in FIG. 1, the element substrate 91 has a protruding region 31 that protrudes outward from one side of the color filter substrate 92, and a driver IC 40 is mounted on the protruding region 31. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 35, and the other end side of the plurality of external connection wirings 35 is electrically connected to the FPC 41. It is connected. Each source line 32 is formed so as to extend in the Y direction and at an appropriate interval in the X direction, and one end side of each source line 32 is connected to an output side terminal (not shown) of the driver IC 40. Electrically connected.

  Each gate line 33 includes a first wiring 33a formed so as to extend in the Y direction, and a second wiring 33b formed so as to extend in the X direction from the terminal portion of the first wiring 33a. ing. The second wiring 33 b of each gate line 33 is formed to extend in the direction intersecting each source line 32, that is, in the X direction and at an appropriate interval in the Y direction. One end of one wiring 33a is electrically connected to a terminal (not shown) on the output side of the driver IC 40. A polysilicon TFT 37 is provided at a position corresponding to the intersection of each source line 32 and each gate line 33 with the second wiring 33 b. Each polysilicon TFT 37 is provided with each source line 32, each gate line 33, and each pixel electrode 34. Etc. are electrically connected. Each polysilicon TFT 37 is provided at a position corresponding to each sub-pixel SG on an element substrate 91 such as glass. Each pixel electrode 34 is formed of, for example, a transparent conductive material such as ITO (Indium-Tin Oxide), and is provided at a position corresponding to each sub-pixel SG on the element substrate 91. Each pixel electrode 34 is electrically connected to the source line 32 and each polysilicon TFT 37 through a contact hole provided in an interlayer film (not shown).

  A region in which a plurality of display pixels AG are arranged in a matrix in the X and Y directions is an effective display region V (a region surrounded by a two-dot chain line). In the effective display area V, images such as letters, numbers, and figures are displayed.

  The area outside the effective display area V is a frame area 38 that does not contribute to display. As will be described in detail later, the frame region 38 is provided with a plurality of detection regions SGa as regions for detecting the light emitted from the illumination device 10. In each detection region SGa, an optical sensor 61 constituting a specific example of the “first light receiving element” in the present invention and an optical sensor 62 constituting a specific example of the “second light receiving element” in the present invention are formed. Yes. Each of the optical sensor 61 and the optical sensor 62 is specifically a semiconductor element such as a PIN (p-intrinsic-n Diode) diode or a MOS transistor. In the following description, description will be given of an example in which each of the optical sensor 61 and the optical sensor 62 is a PIN (p-intrinsic-n Diode) diode. The optical sensor 61 and the optical sensor 62 are electrically connected to the optical detection circuit 52 through the wiring 32a. The light detection circuit 52 detects the current generated in each of the light sensor 61 and the light sensor 62 so that light incident on each of the light sensor 61 and the light sensor 62 (particularly, as described in detail later, illumination The luminance of the light of a predetermined color out of the light emitted from the device 10 is detected.

  Next, the planar configuration of the color filter substrate 92 will be described. As shown in FIG. 2, the color filter substrate 92 is formed on a substrate 2 such as glass on a colored layer 6R, 6G1, 6B, 6G2 of four colors of a black matrix BM, R, G1, B, and G2, a common electrode 8, and the like. Have The black matrix BM is formed at a position that divides each color sub-pixel SG. In the following description or drawings, when a component is shown without specifying the colors of R, G1, B, and G2, it is simply written as “colored layer 6”, and R, G1, B, and G2 In the case of showing the components by distinguishing colors, for example, “colored layer 6R” is used. The sub-pixels SG for each color of R, G1, B, and G2 include R, G1, B, and G2 colored layers 6R, 6G1, 6B, and 6G2, respectively. The colored layers 6R, 6G1, 6B, and 6G2 of R, G1, B, and G2 function as color filters for the respective colors. The common electrode 8 is made of a transparent conductive material such as ITO like the pixel electrode, and is formed over substantially the entire surface of the color filter substrate 92. The common electrode 8 is electrically connected to one end side of the wiring 36 in the corner area E1 of the sealing material 5, and the other end side of the wiring 36 is electrically connected to an output terminal corresponding to the COM of the driver IC 40. It is connected to the.

  Next, the illumination device 10 will be described. The lighting device 10 includes a light guide plate 11 and a light source unit 12. The light source unit 12 emits light L to the end surface 11 c of the light guide plate 11. As will be described in detail later, the light source unit 12 includes LEDs (Light Emitting Diodes) 13 for RGB colors as light sources.

  Light L emitted from the light source unit 12 enters the light guide plate 11 through an end surface (hereinafter referred to as “light incident end surface”) 11 c of the light guide plate 11, and is repeatedly reflected on the output surface 11 a and the reflection surface 11 b of the light guide plate 11. Change direction. The light L is emitted from the emission surface 11a of the light guide plate 11 toward the liquid crystal display panel 30 when the angle formed between the emission surface 11a of the light guide plate 11 and the light L exceeds a critical angle. The light L is emitted from the reflective surface 11b of the light guide plate 11 when the angle formed between the reflective surface 11b of the light guide plate 11 and the light L exceeds a critical angle. However, the light emitted from the reflection surface 11 b of the light guide plate 11 is reflected by the reflection sheet 16 that reflects the light and returned to the inside of the light guide plate 11.

  Light L emitted from the emission surface 11 a of the light guide plate 11 toward the liquid crystal display panel 30 passes through the diffusion sheet 14 and the prism sheet 15 and then passes through the liquid crystal display panel 30. The diffusion sheet 14 diffuses and emits the light L. The prism sheet 15 includes prism sheets 15a and 15b. Each of the prism sheets 15 a and 15 b has a prism shape whose cross-sectional shape is substantially triangular, and emits light L toward the liquid crystal display panel 30. The prism sheets 15a and 15b are arranged so that the ridgelines of the prism-shaped prisms are substantially perpendicular to each other. The liquid crystal display device 100 is illuminated by the light L passing through the liquid crystal display panel 30. Thereby, the liquid crystal display device 100 can display images, such as a character, a number, and a figure, and an observer can visually recognize an image.

  In the liquid crystal display device 100, G1, G2,..., Gm−1, Gm (m is a natural number) are generated by the driver IC 40 based on the signal and power from the FPC 41 side connected to the main board or the like of the electronic device. The gate lines 33 are sequentially selected one by one in order, and a gate signal of a selection voltage is supplied to the selected gate lines 33, while the other non-selected gate lines 33 are not selected. A voltage gate signal is provided. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 34 located at positions corresponding to the selected gate lines 33, respectively, corresponding S1, S2,..., Sn-1, Sn ( n is a natural number) and is supplied via the polysilicon TFT 37. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the liquid crystal display device 100 is switched to the non-display state or the intermediate display state.

  Although the liquid crystal display device 100 according to the present embodiment is shown as a completely transmissive liquid crystal display device, the present invention is not limited to this, and a transflective liquid crystal display device may be used instead. Furthermore, although the liquid crystal display device 100 according to the present embodiment is configured as the color filter from the four colors of the colored layers 6R, 6G1, 6B, and 6G2, the present invention is not limited to this, and a general liquid crystal display is used instead. Similarly to the apparatus, it may be configured by RGB color filters. Or you may comprise from the other color filter.

  Further, the liquid crystal display panel 30 is not limited to a liquid crystal display panel having a liquid crystal layer made of TN liquid crystal as described above. Instead, a VA (Vertical Alignment) method, an IPS (In Plane Switching) method, an FFS (Fringe) is used. It is also possible to use a liquid crystal display panel such as a field structure.

  In the present embodiment, the liquid crystal display panel 30 is used as the display panel. However, the present invention is not limited to this. Instead, when another display panel such as an organic EL (electroluminescence) display panel is used as the display panel. You can also

(2) Configuration of Detection Area Next, the configuration of the detection area SGa will be described. FIG. 3 is an enlarged cross-sectional view of one detection region SGa along the cutting line CC ′ in the liquid crystal display device 100. FIG. 4 is a circuit diagram conceptually showing the circuit configuration of one detection region SGa.

  As shown in FIGS. 3 and 4, each of the optical sensor 61 and the optical sensor 62 (here, a PIN diode) is formed on the element substrate 91 in the detection region SGa.

  First, the configuration on the element substrate 91 side in the detection region SGa will be described. As shown in FIG. 3, a silicon oxide film (not shown) is formed on the inner surface of the element substrate 91. On the inner surface of the silicon oxide film, an i (intrinsic) layer 61b, which is a pure polysilicon (p-Si) layer, is formed in a region where the optical sensor 61 is formed, and on both sides of the i layer 61b, A high impurity concentration p + layer 61c in which boron (B) ions are implanted into polysilicon and a high impurity concentration N + layer 61a in which phosphorus (P) ions are implanted into polysilicon are formed sandwiching the i layer 61b. ing. The PIN diode as the optical sensor 61 is composed of the i layer 61b, the p + layer 61c, and the N + layer 61a. Similarly, on the inner surface of the silicon oxide film, an i layer 62b which is a pure polysilicon layer is formed in a region where the optical sensor 62 is formed, and the i layer 62b is sandwiched between both sides of the i layer 62b. Thus, a high impurity concentration p + layer 62c in which boron ions are implanted into polysilicon and a high impurity concentration N + layer 62a in which phosphorus ions are implanted into polysilicon are formed. The PIN diode that is the optical sensor 62 includes the i layer 62b, the p + layer 62c, and the N + layer 62a.

  The N + layer 61a of the optical sensor 61 is electrically connected to a high power source VHH (not shown in FIG. 3) via a wiring 63, and the p + layer 61c of the optical sensor 61 is optically connected via a wiring 64. The N + layer 62a of the sensor 62 is electrically connected, and the p + layer 62c of the optical sensor 62 is electrically connected to a low-level power supply VLL (not shown in FIG. 3) via a wiring 65. That is, in this embodiment, the optical sensor 61 and the optical sensor 62 are connected in series.

  As shown in FIG. 4, the input terminal of the light detection circuit 52 is electrically connected between the light sensor 61 and the light sensor 62 (that is, the wiring 64). Therefore, the difference between the current generated in the photosensor 61 and the current generated in the photosensor 62 is input to the photodetection circuit 52. The light detection circuit 52 detects the luminance of the light L incident on the liquid crystal display panel 30 from the lighting device 10 based on the difference between the current generated in the light sensor 61 and the current generated in the light sensor 62. . The detected luminance of the light L is output to the LED control circuit 53 provided in the lighting device 10.

  The LED control circuit 53 adjusts the luminance of light emitted from the LED 13 included in the illumination device 10 based on the luminance detected by the light detection circuit 52.

  Next, the configuration on the color filter substrate 92 side in the detection region SGa will be described. As shown in FIG. 3, a solid black matrix BM is formed of resin or the like on the inner surface of the color filter substrate 92 (in particular, the detection region SGa). In particular, the black matrix BM formed in the detection region SGa has a light blocking property for preventing light outside the liquid crystal display panel 30 from entering the liquid crystal display panel 30, and the light L emitted from the illumination device 10 is not affected. It is made of a material that has both properties of non-reflective properties that prevent reflection. In the detection region SGa, a reflective layer 81 made of aluminum (Al) or the like is formed on the inner surface of the black matrix BM so as to face the optical sensor 61. On the other hand, in the detection region SGa, the reflective layer 81 is not formed on the inner surface of the black matrix BM so as to face the optical sensor 62. On the inner surface of the reflective layer 81, a colored layer 6 a of each color made of the same material as the colored layer 6 of each color is formed facing the optical sensor 61.

  In the liquid crystal display device 100 according to the present embodiment, the detection region SGa is provided in the frame region 38 as many as the number of colors of the LEDs 13 in the lighting device 10. That is, if the illuminating device 10 is provided with LEDs 13 for each color of RGB as a light source, the frame area 38 includes a detection area for detecting red light, a detection area for detecting green light, and blue light. There are at least three detection areas SGa as detection areas for detecting the above.

  The colored layer 6a in one detection region SGa is provided with a colored layer corresponding to the color of light to be detected, that is, the color of light emitted from the LED 13. Specifically, the colored layer 6a in the detection region SGa for detecting red light is formed of the same color material as the colored layer 6R. Similarly, the colored layer 6a in the detection region SGa for detecting green light is formed of the same color material as the colored layer 6G1 or the colored layer 6G2. Similarly, the colored layer 6a in the detection region SGa for detecting blue light is formed of the same color material as that of the colored layer 6B. In addition, as the colored layer 6a in the detection region SGa for detecting green light, the yellow-green colored layer 6G2 that is a colored layer in which the luminance of transmitted light is increased is used among the colored layer 6G1 or the colored layer 6G2. Is preferred.

  The light L incident on the liquid crystal display panel 30 enters each of the optical sensor 61 and the optical sensor 62 from the back side of each of the optical sensor 61 and the optical sensor 62 (that is, the illumination device 10 side). Since each of the optical sensor 61 and the optical sensor 62 is a PIN diode, currents flowing between the N + layer 61a and the p + layer 61c and between the N + layer 62a and the p + layer 62c when irradiated with light. Occurs. The magnitude of the current changes according to the luminance of the incident light. Specifically, the amount of generated current increases as the luminance of light incident on the optical sensor 61 and the optical sensor 62 increases, and the amount of generated current decreases as the luminance of the light decreases.

  In addition, since the i layer 61b of the optical sensor 61 and the i layer 62b of the optical sensor 62 are relatively thin (specifically, for example, about 50 nm), each of the optical sensor 61 and the optical sensor 62 is provided. At least a part of the light L incident on each of the optical sensor 61 and the optical sensor 62 from the back side of the light passes through each of the optical sensor 61 and the optical sensor 62 and propagates to the color filter substrate 92 side. Further, among the light L incident on the liquid crystal display panel 30, at least a part of the light not incident on the optical sensor 61 and the optical sensor 62 also propagates toward the color filter substrate 92 side. As shown in FIG. 4, the light propagated to the color filter substrate 92 side is reflected by the reflective layer 81 and then enters the optical sensor 61 again. On the other hand, since the light propagated to the color filter substrate 92 side is not reflected by the black matrix BM, the light L propagated to the color filter substrate 92 side does not enter the optical sensor 62 again.

  Therefore, the optical sensor 61 reflects the light L emitted from the illumination device 10 and the light L emitted from the illumination device 10 and reflected by the reflective layer 81 and transmitted through the colored layer 6a (that is, from the illumination device 10). Light of the colored layer 6a in the emitted light L) is received. For this reason, the optical sensor 61 includes a thermal current corresponding to the ambient temperature of the optical sensor 61, a light reception current (photocurrent) generated by directly receiving the light L emitted from the illumination device 10, and an emission from the illumination device 10. Each of the light receiving currents (specific color photocurrents) generated by receiving light of a specific color in the light L to be generated is generated. More specifically, when the colored layer 6a is formed of the same color material as the colored layer 6R, the optical sensor 61 includes the light L emitted from the illumination device 10 and the light source emitted from the illumination device 10. Receives red light of the light. For this reason, the optical sensor 61 includes a thermal current corresponding to the ambient temperature of the optical sensor 61, a light reception current (photocurrent) generated by directly receiving the light L emitted from the illumination device 10, and an emission from the illumination device 10. Each of the received currents (red photocurrents) generated by receiving the red light of the light L to be generated. Similarly, when the colored layer 6a is formed of the same color material as that of the colored layer 6G, the optical sensor 61 includes the light L emitted from the illumination device 10 and the light L emitted from the illumination device 10. The green light is received. For this reason, the optical sensor 61 includes a thermal current corresponding to the ambient temperature of the optical sensor 61, a light reception current (photocurrent) generated by directly receiving the light L emitted from the illumination device 10, and an emission from the illumination device 10. Receiving current (green photocurrent) generated by receiving green light among the light L generated is generated. Similarly, when the colored layer 6a is formed of the same color material as that of the colored layer 6B, the optical sensor 61 includes the light L emitted from the illumination device 10 and the light L emitted from the illumination device 10. The blue light is received. For this reason, the photosensor 61 emits a thermal current according to the ambient temperature of the photosensor 61, a light reception current (photocurrent) generated by directly receiving light emitted from the illumination device 10, and an illumination device 10. Each of the received currents (blue photocurrents) generated by receiving blue light of the light source light generated.

  On the other hand, the optical sensor 62 receives the light L emitted from the illumination device 10. For this reason, in the optical sensor 62, a thermal current corresponding to the environmental temperature of the optical sensor 62 and a light receiving current (photocurrent) generated by directly receiving the light L emitted from the lighting device 10 are generated.

  Accordingly, the photodetection circuit 52 connected to each of the photosensor 61 and the photosensor 62 via the wiring 32a includes the light reception result (that is, the thermal current, photocurrent, and specific color photocurrent) in the photosensor 61, and the photosensor. A “specific color photocurrent generated by receiving light of a specific color in the light L emitted from the illumination device 10”, which is a difference from the light reception result (that is, the thermal current and the photocurrent) in 62, is output. . Thereby, the light detection circuit 52 can detect the luminance of the light of a specific color in the light source light emitted from the illumination device 10. For this reason, the LED control circuit 53 suitably controls the LED 13 that emits light of a specific color among the LEDs 13 included in the illumination device 10 based on the luminance of the light of the specific color detected by the light detection circuit 52. be able to.

  Thus, according to the liquid crystal display device 100 according to the present embodiment, two photosensors (that is, the photosensor 61 and the photosensor 62) are formed, and a specific color is obtained via the reflective layer 81 and the colored layer 6a. Light is incident on the optical sensor 61. For this reason, a specific color of the light L emitted from the illumination device 10 can be obtained without providing a separate reflection layer or the like on the back side of each of the optical sensor 61 and the optical sensor 62 (that is, the illumination device 10 side). It is possible to suitably detect the brightness of the light.

  In addition, in a configuration in which the brightness of a specific color light is detected using a single photosensor, a thermal current is generated according to the ambient temperature of the photosensor. It is difficult to detect the generated light receiving current itself with high accuracy. However, in the liquid crystal display device 100 according to the present embodiment, since two optical sensors (that is, the optical sensor 61 and the optical sensor 62) are formed, the influence of the thermal current is appropriately or reliably eliminated as described above. can do. Accordingly, it is possible to detect the luminance of the light of a specific color out of the light L emitted from the illumination device 10 with high accuracy.

  Furthermore, in the liquid crystal display device 100 according to the present embodiment, the optical sensor 61 and the optical sensor 62 are formed by forming a semiconductor element such as a PIN diode that generates current when light is incident on the liquid crystal display panel 30. For this reason, the size of the photosensor can be reduced and the degree of freedom of the arrangement can be increased, compared with the addition of the photosensor manufactured as an independent module. . Further, since the optical sensor 61 and the optical sensor 62 are formed in the frame area 38 that does not contribute to display, it is not necessary to affect the display image.

  In the above-described embodiment, the photosensor 61 and the photosensor 62 are connected in series, and the input terminal of the photodetection circuit 52 is electrically connected between the photosensor 61 and the photosensor 62, and the photodetection is performed. A configuration in which the luminance of light of a specific color is detected by the circuit 52 is described. However, it is not limited to this configuration, and may have other configurations. Here, another configuration example will be described with reference to FIG. In addition, about the structure similar to the liquid crystal display device 100 mentioned above, the same referential mark is attached | subjected and the detailed description is abbreviate | omitted.

  As shown in FIG. 5, the light detection circuit 52 a is connected to the light sensor 61, and the light detection circuit 52 b is connected to the light sensor 62. Therefore, the photodetection circuit 52 a has a thermal current corresponding to the ambient temperature of the optical sensor 1, a received light current (photocurrent) generated by directly receiving the light L emitted from the illumination device 10, and emitted from the illumination device 10. The sum of the light receiving currents (specific color photocurrents) generated by receiving light of a specific color among the light L to be input is input, and the luminance is calculated based on the input current. On the other hand, the light detection circuit 52b receives the total of the thermal current corresponding to the environmental temperature of the optical sensor 62 and the light reception current (photocurrent) generated by directly receiving the light L emitted from the illumination device 10, The luminance is calculated based on the input current. The luminances calculated by the light detection circuits 52a and 52b are respectively input to the difference calculation circuit 54. The difference calculation circuit 54 specifies the light L emitted from the lighting apparatus 10 based on the difference between the two luminances. The brightness of the light of the color is calculated. According to this configuration, since the optical sensor 61 and the optical sensor 62 are not connected in series, it is not necessary to consider the wiring between the optical sensor 61 and the optical sensor 62 when laying out on the element substrate 91. Layout is improved.

  In addition, in this configuration, the optical sensor 61 that receives light of a specific color among the light L emitted from the illumination device 10 is the number of types of LEDs 13 included in the illumination device 10 (in other words, the illumination device 10). The number of the light colors emitted from the illuminating device 10, while only one light sensor 62 that receives only the light L emitted from the illumination device 10 is formed in common. It ’s enough. Specifically, for example, when the lighting device 10 includes an LED 13 that emits red light, an LED 13 that emits green light, and an LED 13 that emits blue light, the light sensor 61 that receives red light, the green light, While it is necessary to form the optical sensor 61 for receiving the light and the optical sensor 61 for receiving the blue light, it is sufficient to form one optical sensor 62 in common with the three optical sensors 61. Therefore, the number of photosensors 62 formed on the color filter substrate 92 can be relatively reduced.

  Needless to say, as the illumination device 10 or the like, any configuration used in an existing liquid crystal display device or the like may be adopted. For example, you may employ | adopt the structure currently disclosed by Unexamined-Japanese-Patent No. 2007-212712 as an example of the illuminating device 10 grade | etc.,. Hereinafter, for reference, an example of the illumination device 10 and the like and an example of a control mode of the illumination device 10 will be described.

(3) Configuration of Lighting Device Next, the configuration of the lighting device 10 according to the present embodiment will be specifically described. The illumination device 10 includes the light source unit 12 and the light guide plate 11 as described above.

  FIG. 6 is a perspective view illustrating a configuration of the light source unit 12 according to the present embodiment. As shown in FIG. 6, the light source unit 12 includes a flexible substrate 72 and a plurality of light source packages 71 arranged on the flexible substrate 72. In the light source package 71, a plurality of light sources that respectively emit light of a plurality of colors are packaged in one package. Such a light source package 71 is also called a so-called 3 in 1 LED package. In the light source unit 12 shown in FIG. 6, LEDs 13R, 13G, and 13B that emit light of each color of RGB are packaged into one light source package 71, respectively. The plurality of light source packages 71 are arranged in parallel so that the light emitted from the LEDs 13R, 13G, and 13B has the same emission direction. The light incident end surface 11c of the light guide plate 11 is disposed opposite to the light emission direction of the light emitted from the LEDs 13R, 13G, and 13B, and the light emitted from the LEDs 13R, 13G, and 13B is incident on the light incident end surface of the light guide plate 11. 11c. As the light emitted from the LEDs 13R, 13G, and 13B diffuses, the light is mixed into the light L that is white light.

  Here, the configuration of the light source package 71 will be described. FIG. 7 is an enlarged cross-sectional view of one light source package 71 taken along the cutting line B-B ′ in FIG. 6. The light source package 71 mainly includes a reflection frame 73 and LEDs 13 that emit light of each color of RGB. The reflection frame 73 is formed of a resin or the like and has a mortar-shaped recess, and a reflection film that reflects light by plating or the like is formed on the inner surface of the recess. Since the enlarged cross-sectional view of the light source package 71 shown in FIG. 7 is taken along the cutting line BB ′ in FIG. 6, only the red LED 13R is shown, but actually the light of each color of RGB is shown. Each color LED 13 that emits light is installed on the bottom surface of the concave portion of the reflection frame 73. Electrodes 75 and 76 are provided on the bottom surface of the concave portion of the reflection frame 73. One ends of the electrodes 75 and 76 are connected to the outside of the reflection frame 73, specifically, to a drive circuit (not shown) for driving the LED 13 installed on the flexible substrate 72. On the other hand, the other ends of the electrodes 75 and 76 are connected to the LED 13. For example, as shown in FIG. 7, the anode 77 of the red LED 13 is connected to the electrode 75, and the cathode 78 of the red LED 13 </ b> R is connected to the electrode 76. The red LED 13R is connected to a drive circuit via electrodes 75 and 76. The red LED 13R emits red light when an electric current Ir flows from the outside. If the current amount of the current Ir is increased, the luminance of the red light emitted from the red LED 13R increases, and if the current amount of the current Ir is decreased, the luminance of the red light emitted from the red LED 13R decreases.

  Similarly, for the green LED 13G and the blue LED 13B, the anode and the cathode are respectively connected to electrodes connected to the outside of the reflection frame 73. The green LED 13G and the blue LED 13B are also connected to the drive circuit via the electrodes. The green LED 13G and the blue LED 13B emit green light and blue light when currents Ig and Ib flow from the outside, respectively. If the current amounts of the currents Ig and Ib are increased, the luminances of the green light and the blue light emitted from the green LED 13G and the blue LED 13B are increased. If the current amounts of the currents Ig and Ib are decreased, the green LED 13G and the blue light are increased. The luminances of green light and blue light emitted from the LED 13B are reduced.

  The reflective frame 73 is provided with LEDs 13 that emit light of each color of RGB on the bottom surface of the concave portion, and then sealed with a transparent resin 74 to complete the light source package 71. Here, a lens may be disposed on the uppermost surface of the resin 74, in other words, on the light emission surface of the light source package 71. For example, if a concave lens is arranged as the lens, the light emitted from each color LED 13 can be diffused more.

  FIG. 8 is a block diagram illustrating a configuration of the illumination device 10. In FIG. 8, two light source packages 71 are shown as an example. As shown in FIG. 6, each of the light source packages 71 is provided with one LED 13R, 13G, 13B of each color of RGB. That is, as shown in FIG. 8, one of the two light source packages 71 is provided with a red LED 13R1, a green LED 13G1, and a blue LED 13B1, and the other light source package 71 has a red LED 13R2, a green LED 13G2, and a blue color. Assume that an LED 13B2 is provided.

  As shown in FIG. 8, the illumination device 10 is provided in the light source unit 12, and in addition to a plurality of RGB LEDs 13R, 13G, and 13B packaged in a light source package 71, a red LED driving circuit 51R, A green LED drive circuit 51G, a blue LED drive circuit 51B, and an LED control circuit 53 electrically connected to the above-described light detection circuit 52 are provided.

  The red LED drive circuit 51R is connected to the red LEDs 13R1 and 13R2, the green LED drive circuit 51G is connected to the green LEDs 13G1 and 13G2, and the blue LED drive circuit 51B is connected to the blue LEDs 13B1 and 13B2.

  The red LED drive circuit 51R, the green LED drive circuit 51G, and the blue LED drive circuit 51B are connected to the LED control circuit 53. The LED control circuit 53 is connected to the light detection circuit 52 described above.

  The LED control circuit 53 transmits a control signal to the red LED drive circuit 51R, the green LED drive circuit 51G, and the blue LED drive circuit 51B based on the luminance of the light of a specific color detected by the light detection circuit 52. The red LED drive circuit 51R, the green LED drive circuit 51G, and the blue LED drive circuit 51B change the pulse current that flows through the LEDs 13 of each color based on the control signal.

  The red LEDs 13R1 and 13R2 are electrically connected in series. The red LEDs 13R1 and 13R2 connected in series are supplied with a current Ir by the red LED driving circuit 51R. In FIG. 8, the flow of current flowing through the red LEDs 13R1 and 13R2 is indicated by solid line arrows. As a result, the current Ir flows through the red LEDs 13R1 and 13R2, and the red LEDs 13R1 and 13R2 can both emit red light having the same luminance.

  In FIG. 8, the flow of current flowing through each of the green LEDs 13G1 and 13G2 and the blue LEDs 13B1 and 13B2 is also indicated by broken-line arrows.

  The green LEDs 13G1 and 13G2 are electrically connected in series. The green LEDs 13G1 and 13G2 connected in series are supplied with a current Ig by the green LED driving circuit 51G. Thereby, the current Ig flows in both the green LEDs 13G1 and 13G2, and both the green LEDs 13G1 and 13G2 can emit green light having the same luminance.

  The blue LEDs 13B1 and 13B2 are also electrically connected in series. The two blue LEDs 13B1 and 13B2 connected in series are supplied with a current Ib by the blue LED driving circuit 51B. Thereby, the current Ib flows through both the blue LEDs 13B1 and 13B2, and both the blue LEDs 13B1 and 13B2 can emit blue light having the same luminance.

  FIG. 9 shows a circuit diagram of a red LED drive circuit 51R according to the present embodiment as an example. The red LED drive circuit 51R includes a current limiting resistor Rr and a power source Vr. The magnitude of the current limiting resistor Rr is determined by the allowable value of the current Ir that can be passed through the red LEDs 13R1 and 13R2. The power supply Vr supplies a pulse current to the red LEDs 13R1 and 13R2. The width and timing of the pulse current supplied to the red LEDs 13R1 and 13R2 can be changed by controlling the power supply Vr. Each of the green LED drive circuit 51G and the blue LED drive circuit 51B also supplies a pulse current to each of the green LEDs 13G1 and 13G2 and the blue LEDs 13B1 and 13B2 that are electrically connected in the same manner as the red LED drive circuit 51R. Each has a power supply.

  As can be seen from the above, in the light source unit 12 according to the present embodiment, the RGB LEDs 13 each have an LED drive circuit 51 for each color. The LED drive circuit 51 connected to each color LED 13 supplies a pulse current to each color LED 13 electrically connected based on a control signal from the LED control circuit 53. Thus, by providing the LED drive circuit 51 for each LED 13 of each color, a pulse current can be applied separately for each LED 13 of each color.

(4) LED Current Control Processing Next, LED current control processing in the liquid crystal display device 100 according to the present embodiment will be described. Since the luminance of the light emitted from the RGB LEDs 13 changes due to temperature change and time change, the white balance of the light L emitted from the illumination device 10 is lost due to temperature change and time change. Therefore, it is necessary to adjust the luminance of each color of light emitted from each of the RGB LEDs 13 every time the luminance of the light changes. This LED current control process will be described with reference to the flowchart of FIG.

  In the detection area SGa, the light detection circuit 52 detects the luminance of the light of a specific color based on the current supplied from the light sensor 61 and the light sensor 62 that detect the light transmitted through the colored layer 6a of each color. In addition, the LED control circuit 53 is supplied. Based on the luminance, the LED control circuit 53 determines whether or not the luminance ratio of each of the RGB colors is a predetermined ratio, that is, the luminance ratio of RGB that becomes the desired white light (step S1). ). When the ratio of the luminance of each color of RGB is the ratio of the luminance of RGB that becomes the desired white light (step S21: Yes), the LED control circuit 53 ends the process. On the other hand, when the ratio of the luminance of each RGB color does not become the ratio of the luminance of RGB that becomes the desired white light (step S2: No), the LED control circuit 53 sends a control signal to the LED drive circuit 51 of each color. By adjusting the width of the pulse current supplied to the LED 13 of each color from the LED driving circuit 51 of each color, the luminance ratio of the light emitted from the LED 13 of each RGB color is RGB in which the desired white light is obtained. Adjustment is made so that the luminance ratio is obtained (step S2). Then, the LED control circuit 53 ends the process.

  With the configuration described above, in the liquid crystal display device 100 according to the present embodiment, the luminance of the light emitted from the LEDs 13 of each color changes due to a change in temperature or a change with time, and the luminance of each color of RGB in the light L The white balance can be automatically adjusted even if the ratio of the white balance changes.

  In the illumination device 10 according to the present embodiment, the pulse current is supplied to the LEDs 13 of each color. However, the present invention is not limited to this, and it goes without saying that a constant current may be supplied instead. Yes. In this case, the LED control circuit 53 sends a control signal to the LED drive circuit 51 of each color LED based on the magnitude of the current supplied from the light detection circuit 52, and the LED drive circuit 51 for each color By adjusting the magnitude of the constant current supplied to the LED 13, the luminance ratio of the light emitted from the RGB LEDs 13 is adjusted.

  In addition, a configuration in which the above-described lighting device 10 includes the LEDs 13 of RGB colors is described. However, the illuminating device 10 may be provided with LED13 which radiate | emits white light instead of LED13 of RGB each color. In this case as well, the luminance of the RGB light of the white light is detected based on the current supplied from the optical sensor 61 and the optical sensor 62, and the luminance ratio of the RGB light is desired. You may control LED13 so that it may become the brightness | luminance of RGB used as white light. At this time, the width of the pulse current supplied to the LED 13 may be adjusted as described above, the RGB image signal supplied to the liquid crystal display panel 30 via the driver IC 40 may be adjusted, or The γ correction curve may be adjusted. Alternatively, other adjustments may be made. In any case, the luminance of the light of each color of RGB among the white light is detected based on the current supplied from the light sensor 61 and the light sensor 62, and the ratio of the luminance of the light of each color of RGB is desired. As long as the LED 13 is controlled so as to have RGB brightness that becomes white light, the various effects described above can be enjoyed.

(5) Electronic Device Next, an example of an electronic device including the liquid crystal display device 100 described above will be described with reference to FIGS. 11 and 12.

  FIG. 11 is a perspective view of a mobile personal computer to which the above-described liquid crystal display device 100 is applied. In FIG. 11, a computer 1200 includes a main body 1204 provided with a keyboard 1202 and a liquid crystal display unit 1206 including the liquid crystal display device 100 described above.

  Next, an example in which the above-described liquid crystal display device 100 is applied to a mobile phone will be described. FIG. 12 is a perspective view of a mobile phone which is an example of an electronic apparatus. In FIG. 12, a mobile phone 1300 includes a liquid crystal device 1005 that adopts a transflective display format and has a configuration similar to that of the liquid crystal display device 100 described above, together with a plurality of operation buttons 1302.

  Since these electronic apparatuses also include the liquid crystal display device 100 described above, the various effects described above can be suitably enjoyed.

  In addition to the electronic apparatus described with reference to FIGS. 11 and 12, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a workstation , A video phone, a POS terminal, a device including a direct-view liquid crystal device including a touch panel, and the like. And it cannot be overemphasized that the liquid crystal display device 100 mentioned above is applicable with respect to these various electronic devices.

  The present invention is not limited to the above-described embodiments, and various modifications can be made as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification. The device, the light detection device, and the electronic device are also included in the technical scope of the present invention.

It is a top view which shows the structure of the liquid crystal device which concerns on embodiment. It is H-H 'sectional drawing of FIG. It is an expanded sectional view of one detection field along cutting line C-C 'in a liquid crystal display. It is a circuit diagram which shows notionally the circuit composition of one detection field. It is a circuit diagram which shows notionally other circuit composition of one detection field. It is a perspective view which shows the structure of the light source part which concerns on this embodiment. FIG. 7 is an enlarged cross-sectional view of one light source package taken along a cutting line B-B ′ in FIG. 6. It is a block diagram which shows the structure of an illuminating device. It is a circuit diagram of a red LED drive circuit. It is a flowchart which shows notionally the flow of LED current control processing. It is a perspective view of a mobile personal computer to which a liquid crystal device is applied. 1 is a perspective view of a mobile phone to which a liquid crystal device is applied.

Explanation of symbols

  6a ... colored layer, 10 ... lighting device, 13 ... LED, 52 ... light detection circuit, 53 ... LED control circuit, 61 ... photo sensor, 62 ... photo sensor, 81 ... reflection layer, 91 ... element substrate, 92 ... color filter Substrate, 100 ... Liquid crystal device, BM ... Black matrix, SGa ... Detection region,

Claims (11)

A display panel having a first substrate and a second substrate facing the first substrate;
A light source that emits light toward the display panel from the first substrate side,
The display panel is
A first light receiving element and a second light receiving element formed on the first substrate;
A reflective layer that is formed on the second substrate and reflects light emitted from the light source toward the first light receiving element;
A colored layer formed on an optical path where light emitted from the light source is incident on the reflective layer or on an optical path where light reflected on the reflective layer is incident on the first light receiving element and corresponding to a predetermined color; An electro-optical device comprising:   The electro-optical device according to claim 1, wherein the reflective layer is formed in a region of the second substrate facing the first light receiving element.   The electro-optical device according to claim 2, wherein the reflective layer and the colored layer are not formed in a region facing the second light receiving element. On the second substrate, a light shielding layer that shields light incident from the side opposite to the light source of the second substrate and does not reflect light from the light source is formed,
4. The electro-optical device according to claim 1, wherein the reflection layer is formed on the first substrate side of the light shielding layer. 5.   5. The electro-optical device according to claim 1, wherein the colored layer is formed on the first substrate side of the reflective layer. The light source emits red light, green light and blue light, respectively.
The first light receiving element includes a red light receiving element, a green light receiving element, and a blue light receiving element,
The colored layer is formed on an optical path where light reflected by the reflective layer is incident on the light receiving element for red light and corresponds to red, and the light reflected by the reflective layer is for green light. A green colored layer formed on the optical path incident on the light receiving element and corresponding to green, and a blue colored layer formed on the optical path incident on the light receiving element for blue light and reflected on the reflective layer and corresponding to blue The electro-optical device according to claim 1, further comprising: The light source emits white light,
The first light receiving element includes a red light receiving element, a green light receiving element, and a blue light receiving element,
The colored layer is formed on an optical path where light reflected by the reflective layer is incident on the light receiving element for red light and corresponds to red, and the light reflected by the reflective layer is for green light. A green colored layer formed on the optical path incident on the light receiving element and corresponding to green, and a blue colored layer formed on the optical path incident on the light receiving element for blue light and reflected on the reflective layer and corresponding to blue The electro-optical device according to claim 1, further comprising:   A detection circuit configured to detect a light component of the predetermined color in the light emitted from the light source based on a difference between a light reception result in the first light receiving element and a light reception result in the second light receiving element; The electro-optical device according to claim 1, wherein the electro-optical device is characterized in that   9. The method according to claim 1, further comprising an adjustment circuit that controls the luminance of the light source based on a difference between a light reception result in the first light receiving element and a light reception result in the second light receiving element. The electro-optical device according to Item. A photodetecting device used in an electro-optical device comprising: a display panel having a first substrate and a second substrate facing the first substrate; and a light source that emits light toward the display panel from the first substrate side Because
A first light receiving element and a second light receiving element formed on the first substrate;
A reflective layer that is formed on the second substrate and reflects light emitted from the light source toward the first light receiving element;
And a colored layer formed on an optical path where light emitted from the light source is incident on the reflective layer or on an optical path where light reflected on the reflective layer is incident on the first light receiving element. Photodetector.   An electronic apparatus comprising the electro-optical device according to claim 1.

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