JP4946424B2 - Liquid crystal device and electronic device - Google Patents

Description

The present technology relates to a liquid crystal device and an electronic apparatus.

In recent years, liquid crystal display devices having input functions such as a touch panel and pen input have been widely used. As a touch position detection method in a liquid crystal display device having such an input function,
A resistance film method, an ultrasonic method, a capacitance method, an electromagnetic induction method, an optical method, and the like are known. In any of the detection methods, it is necessary to add various components to the display device, and there is a problem that the device is increased in size and cost.

Therefore, a liquid crystal display device has been developed in which a light receiving element for detecting a touch position is formed on an array substrate on which data lines, scanning lines, thin film transistors (TFTs) as switching elements are formed (for example, patents). Reference 1). In this type of liquid crystal display device, the alignment state of the liquid crystal is controlled for each pixel based on the display data by the display unit including the data line, the display line, and the TFT, and is incident on the liquid crystal based on the alignment state of the liquid crystal. A desired image is displayed on the display surface by modulating the light to be transmitted. Further, for example, when the incident of external light to the light receiving element is blocked by a finger or an input pen, the touch position can be detected by the light receiving element. In such a liquid crystal display device, since the switching element and the light receiving element are formed on the same substrate, the overall thickness of the device can be reduced and the cost can be reduced.
JP 2005-43672 A

However, in the liquid crystal display device described in Patent Document 1, a region functioning as a display unit in each pixel is reduced by the region where the light receiving element is formed. Thereby, since the aperture ratio of each pixel is lowered, there is a problem that display quality is lowered.

The present technology has been made to solve the above-described problems, and an object of the present technology is to provide a liquid crystal device capable of suppressing a decrease in aperture ratio while forming a light receiving element on an array substrate. To provide electronic equipment.

A liquid crystal device according to the present technology includes a liquid crystal injected into a gap between an array substrate and a counter substrate, a display unit that is formed on the array substrate and controls an alignment state of the liquid crystal, and a light receiving element formed on the array substrate In the liquid crystal device in which the display light is emitted from the counter substrate side, the light is incident on the incident path of the incident light with respect to the light receiving element, on the array substrate, and on the counter substrate side with respect to the light receiving element. A wavelength selective reflection layer that selectively reflects only light of a specific wavelength of incident light is formed, and each pixel formed in a matrix on the array substrate receives the display unit and the light receiving element. A color filter is formed on the counter substrate so as to oppose the display unit, and a transmission region that transmits the light reflected by the wavelength selective reflection layer is the light receiving unit. The specific wavelength reflected by the wavelength selective reflection layer is the same as the wavelength of light transmitted through the color filter provided to face the display unit of the same pixel as the wavelength selective reflection layer. It is .

According to the liquid crystal device of the present technology , light having a wavelength other than a specific wavelength among incident light incident from the counter substrate side is transmitted through the wavelength selective reflection layer. The light transmitted through the wavelength selective reflection layer is received by a light receiving element provided below the wavelength selective reflection layer. On the other hand, light of a specific wavelength among the incident light is reflected by the wavelength selective reflection layer. And this reflected light is radiate | emitted to the counter substrate side through the liquid crystal by which the orientation state was controlled by the display part. In this manner, light corresponding to the alignment state of the liquid crystal can be emitted as display light from the region where the light receiving element is formed. That is, the region where the light receiving element is formed can function as a display unit. Therefore, a decrease in the aperture ratio of each pixel can be suitably suppressed, and a decrease in display quality can also be suppressed. Moreover, also when displaying a color image, the area | region in which the light receiving element was formed can be functioned as a display part.

In this liquid crystal device, the wavelength selective reflection layer may be made of cholesteric liquid crystal.
The cholesteric liquid crystal in this liquid crystal device maintains a planar state, that is, a wavelength selective reflection state even when no voltage is applied. A cholesteric liquid crystal can reflect only light having a specific wavelength by adjusting the pitch of liquid crystal molecules having a spiral structure.

In this liquid crystal device, the wavelength selective reflection layer may be formed on the surface of an organic planarization film having a planarized surface.
According to this liquid crystal device, the wavelength selective reflection layer can be formed on the planarized surface. In particular, in the case of a wavelength selective reflection layer made of cholesteric liquid crystal, it becomes easy to adjust the pitch of the liquid crystal molecules having a spiral structure, so that only light having a desired wavelength can be reflected more reliably.

  In this liquid crystal device, a backlight may be provided below the array substrate.

According to this liquid crystal device, also in the transmission type liquid crystal device, it is possible to suitably suppress a decrease in the aperture ratio of each pixel and to suppress a decrease in display quality.
The electronic device of the present technology uses the liquid crystal device.

According to the electronic device of the present technology , it is possible to provide an electronic device that can suppress a decrease in display quality.

(First embodiment)
Hereinafter, an embodiment embodying the present technology will be described with reference to FIGS.
1 is a perspective view of a liquid crystal display device having an input function, FIG. 2 is a perspective view of a color filter substrate provided in the liquid crystal display device having an input function, and FIG. 3 is a schematic diagram of a display unit and a light receiving unit in a pixel. FIG.

As shown in FIG. 1, below the liquid crystal display device 10 having an input function as a liquid crystal device,
A backlight 12 having a light source 11 such as an LED and formed in a square plate shape is provided.
Above the backlight 12, a square plate-like liquid crystal panel 13 having a size substantially the same as that of the backlight 12 is provided. Then, light L <b> 1 (see FIG. 3) emitted from the light source 11 is irradiated toward the liquid crystal panel 13.

The liquid crystal panel 13 includes an array substrate 14 and a color filter substrate 15 that face each other. The array substrate 14 and the color filter substrate 15 are bonded together by a rectangular frame-shaped sealing material 16 made of a photocurable resin. A nematic liquid crystal (liquid crystal) 17 is sealed in a gap between the array substrate 14 and the color filter substrate 15.

A lower polarizing plate 18 is bonded to the lower surface (side surface on the backlight 12 side) of the array substrate 14. The lower polarizing plate 18 directly converts the light from the backlight 12 into the polarized light 17
The light is emitted. On the upper surface of the array substrate 14 (side surface on the color filter substrate 15 side: element forming surface 14a), a plurality of scanning lines Lx extending over substantially the entire width in the X arrow direction
Are arranged. Each scanning line Lx is electrically connected to a scanning line driving circuit 19 disposed on one side of the array substrate 14, and a scanning signal from the scanning line driving circuit 19 is input at a predetermined timing. It has become. A plurality of data lines Ly extending over substantially the entire width in the direction of the arrow Y are arranged on the element formation surface 14a. Each data line Ly is electrically connected to a data line driving circuit 21 disposed on one side of the array substrate 14, and a data signal based on display data from the data line driving circuit 21 is transmitted at a predetermined timing. It is designed to be entered. A plurality of pixels 22 connected to the corresponding scanning lines Lx and data lines Ly and arranged in a matrix are formed at positions where the scanning lines Lx and the data lines Ly intersect on the element formation surface 14a. . Each pixel 22 includes a display unit 23 including a switching element such as a thin film transistor (TFT), a light receiving unit 24 having a display function including a light receiving element such as a PIN diode, and a transparent electrode such as ITO (Indium-Tin-Oxide). A pixel electrode 59 (see FIG. 3) made of a film is formed.

The entire upper side of each pixel 22 is subjected to an alignment process such as a rubbing process, so that the pixel electrode 5
A lower alignment film (not shown) that can set the alignment of the liquid crystal molecules in the vicinity of 9 is formed.
The entire lower surface of the color filter substrate 15 is subjected to an alignment process such as a rubbing process, and an upper alignment film (not shown) for setting the alignment of liquid crystal molecules is formed together with the lower alignment film. . On the upper surface of the color filter substrate 15, the directly polarized light orthogonal to the light from the lower polarizing plate 18 is emitted as the display light L 2 (see FIG. 3) to the observation side (outward: Z arrow direction in FIG. 1). An upper polarizing plate 25 is provided. As shown in FIG. 2, a partition wall 31 is formed on the lower surface of the color filter substrate 15 (side surface on the array substrate 14 side: filter forming surface 15a). The partition wall 31 is formed of a light shielding material such as chromium or carbon black, and is formed in a lattice shape on substantially the entire filter forming surface 15a so as to be opposed to the scanning line Lx and the data line Ly. And by forming this partition wall 31, the filter forming surface 1
In 5a, pixel facing regions 32 surrounded by the partition walls 31 are arranged in a matrix so as to face the pixels 22 respectively. The pixel facing area 32 includes a filter layer area 33 that faces the display section 23 and a transmission area 34 that faces the light receiving section 24. The filter layer region 33 includes a red filter layer 33R that converts light L1 (see FIG. 3) from the backlight 12 into red light and emits it, a green filter layer 33G that converts green light and emits it, and a blue filter layer 33G. It has the blue filter layer 33B which converts into light and radiate | emits.

Next, the structure of each pixel 22 will be described with reference to FIG. FIG. 3 is a cross-sectional view of the main part of the pixel 22 that emits the red light Lr as the display light L2. Note that the pixel 22 that emits the green light Lg and the blue light Lb as the display light L2 also has the same structure as that in FIG.

As shown in FIG. 3, on the element forming surface 14a of the array substrate 14, a light shielding film 41 for blocking the incidence of light L1 from the backlight 12 to the switching element, and the light L1 from the backlight 12 to the light receiving element. A light shielding film 42 for blocking the incidence of the light is formed. Both light shielding films 41
, 42 is formed with an insulating film 43 made of a silicon oxide film or the like deposited so as to cover substantially the entire element forming surface 14a.

A semiconductor layer 44 constituting a switching element is formed on the upper surface of the insulating film 43 and above the light shielding film 41. The semiconductor layer 44 includes a P-type channel region 44c formed at the center thereof, and has an N-type source region 44s and a drain region 44d on both sides of the channel region 44c.

Further, on the upper surface of the insulating film 43 and above the light shielding film 42, a PIN as a light receiving element is provided.
A diode 45 is formed. The PIN diode 45 includes an I-type region 45i made of I-type polysilicon formed at the center thereof, and has an N-type region 45n and a P-type region 45p, which are polycrystalline semiconductors, on both sides of the I-type region 45i. is doing.

On the upper side of the semiconductor layer 44 and the PIN diode 45, a gate insulating film 46 made of a silicon oxide film or the like deposited so as to cover substantially the entire element formation surface 14a is formed. A gate electrode 47 extending from the scanning line Lx is formed on the upper surface of the gate insulating film 46 and above the channel region 44 c of the semiconductor layer 44. The source region 44s and the drain region 44d are formed in a self-aligned manner by phosphorus ion ion implantation using the gate electrode 47 as a mask. The gate electrode 47, the source region 44s and the drain region 44d constitute a TFT 50 as a switching element.

A first interlayer insulating film 51 made of a silicon oxide film or the like that electrically insulates the gate electrodes 47 is formed on the gate electrode 47.
On the source region 44s of the semiconductor layer 44, a contact hole H1 penetrating the gate insulating film 46 and the first interlayer insulating film 51 is formed. In the contact hole H1, the data line Ly electrically connected to the source region 44s by a conductive film made of aluminum or the like is formed. On the other hand, a contact hole H <b> 2 that penetrates the gate insulating film 46 and the first interlayer insulating film 51 is formed on the drain region 44 d of the semiconductor layer 44. A drain region 44 is formed in the contact hole H2 by a conductive film made of aluminum or the like.
A drain electrode 52 electrically connected to d is formed.

On the N-type region 45n of the PIN diode 45, a contact hole H3 penetrating the gate insulating film 46 and the first interlayer insulating film 51 is formed. A first electrode 53 electrically connected to the N-type region 45n is formed in the contact hole H3 by a conductive film made of aluminum or the like. On the other hand, on the P-type region 45p of the PIN diode 45, a contact hole H4 penetrating the gate insulating film 46 and the first interlayer insulating film 51 is formed.
In the contact hole H4, a P-type region 45 is formed by a conductive film made of aluminum or the like.
A second electrode 54 electrically connected to p is formed. PIN diode 45
Are connected to a touch position detection circuit (not shown) through the first electrode 53 and the second electrode 54.

A second interlayer insulating film 55 made of a silicon oxide film or the like is formed on the data line Ly, the drain electrode 52, and the first and second electrodes 53 and 54 so as to cover the first interlayer insulating film 51. On the second interlayer insulating film 55, an organic planarizing film 56 made of acrylic resin or the like is formed. The organic planarization film 56 has a top surface formed by CMP (Chemical Mecha) after film formation.
nical polishing) or the like.

A cholesteric liquid crystal layer 57 as a wavelength selective reflection layer is formed on the upper surface of the organic planarizing film 56 and above the PIN diode 45. The cholesteric liquid crystal of the cholesteric liquid crystal layer 57 is always set to a planar state, that is, a wavelength selective reflection state. The cholesteric liquid crystal layer 57 is set with a pitch of liquid crystal molecules having a spiral structure so as to reflect only the red light Lr and transmit the green light Lg and the blue light Lb when the external light L3 is incident. ing. The red light Lr reflected by the cholesteric liquid crystal layer 57 is emitted to the color filter substrate 15 through the liquid crystal 17, and the green light Lg and the blue light Lb transmitted through the cholesteric liquid crystal layer 57 are PIN diodes. Light is received at 45. The PIN diode 45 performs photoelectric conversion based on the received external light, and outputs a photocurrent signal based on the photoelectric conversion to the touch position detection circuit. In the pixel 22 that emits the green light Lg as the display light L2, the cholesteric liquid crystal layer 57 reflects only the green light Lg when the external light L3 is incident, and the red light Lr and the blue light Lb. The pitch of the liquid crystal molecules is set so as to transmit. In the pixel 22 that emits the blue light Lb, the cholesteric liquid crystal layer 57 reflects only the blue light Lb and transmits the red light Lr and the green light Lg when external light is incident. The pitch of the liquid crystal molecules is set.

A via hole 58 penetrating the second interlayer insulating film 55 and the organic planarizing film 56 is formed above the drain electrode 52. In the via hole 58 and the cholesteric liquid crystal layer 5
A pixel electrode 59 made of a light-transmitting conductive material such as ITO is formed on each pixel 22. The pixel electrode 59 is connected to the drain electrode 52 through the via hole 58.

A filter forming surface 15a (the lower surface in FIG. 3) of the color filter substrate 15 facing the array substrate 14 and at a position facing the display portion 23 of the array substrate 14 is a filter layer region 33 as a color filter. A red filter layer 33R is formed. By this red filter layer 33R, only the red light Lr of the backlight light L1 is emitted as the display light L2. In the pixel 22 that emits the green light Lg as the display light L2, the green filter layer 33G is formed instead of the red filter layer 33R. Further, the pixel 22 that emits the blue light Lb as the display light L2 has the red filter layer 33R.
Instead, a blue filter layer 33B is formed. That is, in the same pixel 22, the light emitted from the filter layer region 33 and the light reflected by the cholesteric liquid crystal layer 57 are set to have the same wavelength.

Under the red filter layer 33R, an organic planarizing film 60 made of acrylic resin or the like is formed so as to cover substantially the entire filter forming surface 15a. On the lower surface of the organic planarization film 60, IT
A counter electrode 61 made of a light-transmitting conductive material such as O is formed over the entire filter formation surface 15 a as a common electrode for the pixel electrode 59 without being partitioned for each pixel 22. The counter electrode 61 is electrically connected to a power supply circuit (not shown), and a predetermined voltage is supplied from the power supply circuit.

The array substrate 14 and the color filter substrate 15 include a pixel electrode 59 and a counter electrode 61.
Are arranged so as to face each other, and between the pixel electrode 59 and the counter electrode 61,
The nematic liquid crystal 17 is enclosed. In the organic planarization film 60, a region where the filter layer region 33 is not formed, that is, a region at a position facing the light receiving portion 24 formed on the array substrate 14 becomes the transmission region 34. That is, the cholesteric liquid crystal layer 5
The light reflected by 7 is transmitted through the transmission region 34 or the filter layer region 33 through the nematic liquid crystal 17 thereabove and emitted as display light L2.

Next, the operation of the liquid crystal display device 10 configured as described above will be described.
First, an operation for displaying predetermined display data on the liquid crystal panel 13 will be described.
Now, when the scanning line driving circuit 19 sequentially selects the scanning lines Lx one by one based on the line sequential scanning, the TFTs 50 of the corresponding pixels 22 are turned on only during the selection period. When the TFT 50 is turned on, the data signal supplied from the data line driving circuit 21 is output to the pixel electrode 59 through the data line Ly and the semiconductor layer 44. Then, based on the potential difference between each pixel electrode 59 and the counter electrode 61, the alignment state of the nematic liquid crystal 17 of the corresponding pixel 22 can be controlled, and the light L1 from the backlight 12 is maintained to be modulated. can do.
At this time, the alignment state of the nematic liquid crystal 17 above the cholesteric liquid crystal layer 57 in the same pixel 22 is similarly controlled. Then, depending on whether the modulated light is transmitted through the upper polarizing plate 25 through the filter layer region 33, desired display light L <b> 2 is emitted to the observation side of the liquid crystal panel 13.

Further, the external light L3 incident on the light receiving portion 24 of each pixel 22 is incident on the cholesteric liquid crystal layer 57 through the corresponding nematic liquid crystal 17. The incident external light L3 reflects only light of a predetermined wavelength (for example, red light Lr) in the cholesteric liquid crystal layer 57, and light of other wavelengths (for example, green light Lg and blue light). Lb) passes through the cholesteric liquid crystal layer 57. The light reflected by the cholesteric liquid crystal layer 57 is modulated based on the alignment state of the nematic liquid crystal 17 above the cholesteric liquid crystal layer 57.
Then, depending on whether the modulated light is transmitted through the upper polarizing plate 25 through the filter layer region 33 or the transmission region 34 formed on the color filter substrate 15, desired display light L 2 is emitted to the observation side of the liquid crystal panel 13. Is done. A desired color image is displayed on the observation side of the liquid crystal panel 13 by the display light L2 and the display light L2 by the light L1 from the backlight 12 (display light L2 from the display unit 23). On the other hand, the light transmitted through the cholesteric liquid crystal layer 57 in the external light L3 is received by the PIN diode 45. The PIN diode 45 performs photoelectric conversion based on the received light, and outputs a photocurrent signal based on the photoelectric conversion to the touch position detection unit. The touch position detection unit detects the touch position based on the photocurrent signal from the PIN diode 45.

Next, when a predetermined position of the liquid crystal panel 13 on which the display data is displayed is touched with a finger or an input pen, the external light L3 is blocked by the finger or the input pen. Then, the external light L3 is not incident on the light receiving unit 24 of the pixel 22 corresponding to the touched position (touch position). As a result, the PIN diode 45 outputs a photocurrent signal indicating that the incidence of the external light L3 is blocked to the touch position detection unit. Then, the touch position detection unit detects the position of the PIN diode 45 that has output the photocurrent signal indicating that the incidence of the external light L3 is blocked as the touch position.

According to this embodiment described above, the following effects can be obtained.
(1) According to the present embodiment, the color filter is located above the PIN diode 45 as a light receiving element, more specifically on the incident path of the external light L3 as incident light, on the array substrate 14 and more than the PIN diode 45. A cholesteric liquid crystal layer 57 as a wavelength selective reflection layer was provided on the substrate 15 side. Further, a nematic liquid crystal 17 whose alignment state is controlled based on display data is provided closer to the color filter substrate 15 than the cholesteric liquid crystal layer 57. And
The cholesteric liquid crystal layer 57 is set so as to reflect only light having a specific wavelength in the external light L3, that is, light having the same wavelength as that emitted from the filter layer region 33 in the same pixel 22. Thereby, the light reflected by the cholesteric liquid crystal layer 57 is modulated based on the alignment state of the nematic liquid crystal 17, and the modulated light is used as the display light L2 in the liquid crystal panel 1.
3 is emitted to the observation side. In this way, the light receiving unit 24 in which the PIN diode 45 is formed also functions as a display unit. Accordingly, since the area functioning as a display unit in each pixel 22 is greatly enlarged as compared with the conventional liquid crystal display device, even if the PIN diode 45 as the light receiving element is formed on the array substrate 14, each pixel 22 A wide aperture ratio can be secured. As a result, a decrease in display quality can be suitably suppressed, and high display quality can be maintained.

Further, a configuration in which a cholesteric liquid crystal is formed on the entire surface instead of the nematic liquid crystal 17 of this embodiment and a light receiving element is provided below the cholesteric liquid crystal is also conceivable. However, in this configuration, since the wavelength selection range by the cholesteric liquid crystal varies according to display data, the amount of external light received by the light receiving element varies. In particular, a light receiving element in a pixel displaying a white or black image may not be able to receive external light. That is, in the above configuration, the wavelength range that can be received by the light receiving element is limited by the display data.

On the other hand, in the liquid crystal display device 10 of the present embodiment, the external light L3 is the nematic liquid crystal 1
7 is incident on the cholesteric liquid crystal layer 57 regardless of the alignment state 7 and the wavelength of the light reflected by the cholesteric liquid crystal layer 57 of each pixel 22 is fixed. Therefore, the external light L3 can be received by the PIN diode 45 without depending on the display data. That is, if the brightness of the external light L3 is the same, the PIN diode 45 receives substantially the same amount of light even when the display data is different. Therefore, in the liquid crystal display device 10 of the present embodiment, sensing that is not affected by display data is possible, and the sensitivity of touch position detection can be improved.

(2) According to the present embodiment, the display light L2 in the display unit 23 is generated based on the light L1 from the backlight 12. Thereby, even if the liquid crystal display device 10 of this embodiment is used in a dark place, desired display data can be displayed on the liquid crystal panel 13.

(3) According to the present embodiment, the cholesteric liquid crystal layer 57 is formed on the surface of the organic flattening film 56 whose surface is flattened. This makes it easy to adjust the pitch of the liquid crystal molecules having a spiral structure of the cholesteric liquid crystal in the cholesteric liquid crystal layer 57, so that only light having a desired wavelength can be more reliably reflected.

(Second Embodiment)
Next, application of the liquid crystal display device 10 having the input function described in the first embodiment to an electronic apparatus will be described with reference to FIG. The liquid crystal display device 10 having an input function can be applied to various electronic devices such as a mobile phone, a mobile personal computer, and a digital camera.

FIG. 4 is a perspective view showing the configuration of the mobile phone. The mobile phone 70 has a plurality of operation buttons 71.
A mouthpiece 72, a mouthpiece 73, and a display unit 74 using the liquid crystal display device 10 having the input function. Instead of the operation button 71, the display unit 74 is used.
A number button or the like may be displayed on the screen, and the operation may be performed by touching the number button with a finger, for example. According to this, it becomes possible to freely change the display size of the number buttons and the like.

In addition, you may change each said embodiment into the following aspects.
In the above embodiment, the cholesteric liquid crystal layer 57 is formed on the surface of the organic flattening film whose surface is flattened. However, the present invention is not limited to this. For example, the cholesteric liquid crystal layer is formed on the upper surface of the second interlayer insulating film 55. 57 may be formed.

In the above embodiment, the TFT 50 is embodied as the switching element. However, the present invention is not limited to this. For example, an active matrix type using a thin film diode element (TFD element: Thin Film Diode element) such as a MIM (Metal Insulator Metal) element. You may apply to a liquid crystal display device.

In the above embodiment, the present invention is embodied in a so-called active matrix type liquid crystal display device including the TFT 50 as a switching element, but may be applied to a passive matrix type liquid crystal display device.

In the above embodiment, the display unit 23 is embodied as a so-called transmissive liquid crystal display device that emits the display light L2 based on the light L1 from the backlight 12. However, the display unit 23 is applied to a reflective liquid crystal display device. May be. In this case, it is necessary to provide a reflector instead of the backlight 12 and to remove the light shielding films 41 and 42. Further, it is preferable to provide a light-shielding film for blocking external light L3 from entering the TFT 50 above the TFT 50. Alternatively, the present invention may be applied to a transflective liquid crystal display device.

In the above embodiment, the liquid crystal device is embodied as a liquid crystal display device having an input function.
For example, the present invention may be applied to a scanner. In this case, although the light input to each PIN diode 45 has a complementary color relationship with the actual image color, light for three colors of RGB can be obtained, so that a color image can be read. In this case, the light source is preferably a backlight.

Alternatively, each PIN diode 45 may be used as an external light detection sensor. That is, the brightness of the environment where the liquid crystal display device 10 is placed may be determined based on the photocurrent signal obtained by each PIN diode 45. According to this, for example, when the environment in which the liquid crystal display device 10 is placed is bright, that is, when the photocurrent signal obtained by the PIN diode 45 is large, and when the display function of the reflective region functions sufficiently, the back It is also possible to reduce the power consumption by adjusting the light L1 from the light 12 to be dark. On the other hand, when the display function of the transmissive region is dominant, it is possible to adjust the light L1 from the backlight 12 to make it easier to recognize the display. Furthermore, compared with the case where a dedicated external light sensor is provided, a reduction in size and cost can be realized.

-There is no restriction | limiting in particular in the planar shape of each pixel opposing area | region 32 in the said embodiment. For example, as shown in FIG. 5, each filter layer region 33 and each transmission region 34 may be arranged side by side in the X arrow direction. Also in this case, it is necessary to form the display unit 23 and the light receiving unit 24 so as to face the filter layer region 33 and the transmission region 34, respectively.

The alignment mode of the nematic liquid crystal 17 related to image display in the above embodiment is not particularly limited. For example, various alignment modes such as TN mode, VAN mode, and STN mode can be set. In any orientation mode, the same effect as the above embodiment can be obtained. As described above, the degree of freedom in selecting the alignment mode of the nematic liquid crystal 17 is high.
It can be adapted to applications such as video support performance and visual characteristics.

In the above embodiment, the liquid crystal injected into the gap between the array substrate 14 and the color filter substrate 15 as the counter substrate is embodied as the nematic liquid crystal 17, but may be changed to a smectic liquid crystal.

-The structure of the TFT 50 in the above embodiment may be an LDD structure or GOLD.
It may be a structure.
In the above embodiment, a PIN diode is embodied as a light receiving element.
A CMOS, PN diode, phototransistor, or the like may be used as the light receiving element.

In the above embodiment, the cholesteric liquid crystal layer 57 is embodied as the wavelength selective reflection layer, but the configuration is not particularly limited as long as it can selectively reflect only light of a specific wavelength.

The schematic perspective view which shows the liquid crystal display device provided with the input function in 1st Embodiment. Similarly, the schematic perspective view which shows a color filter board | substrate. Similarly, the principal part sectional drawing of the display part and light-receiving part in a pixel. The perspective view which shows the mobile telephone of 2nd Embodiment. The top view which shows the color filter board | substrate of a modification.

Explanation of symbols

L2 ... display light, L3 ... external light as incident light, 10 ... liquid crystal display device as liquid crystal device, 1
2 ... Backlight, 14 ... Array substrate, 15 ... Color filter substrate as counter substrate, 1
DESCRIPTION OF SYMBOLS 7 ... Nematic liquid crystal, 22 ... Pixel, 23 ... Display part, 24 ... Light receiving part, 33 ... Filter layer area | region as a color filter, 34 ... Transmission region, 45 ... PIN diode as a light receiving element, 50 ... TFT as switching element 56 ... Organic planarization film, 57 ... Cholesteric liquid crystal layer as a wavelength selective reflection layer.

Claims (5)

A liquid crystal injected into a gap between the array substrate and the counter substrate; a display unit formed on the array substrate for controlling an alignment state of the liquid crystal; and a light receiving element formed on the array substrate. In the liquid crystal device in which the display light is emitted from the side,
Wavelength selective reflection that selectively reflects only light having a specific wavelength out of the incident light on the array substrate on the light receiving element, on the array substrate, and on the opposite substrate side of the light receiving element. A layer is formed ,
Each pixel formed in a matrix on the array substrate is configured to include the display unit and a light receiving unit including the light receiving element,
A color filter is formed on the counter substrate so as to face the display unit, and a transmission region that transmits light reflected by the wavelength selective reflection layer is formed to face the light receiving unit,
The specific wavelength reflected by the wavelength selective reflection layer is the same as the wavelength of light transmitted through the color filter provided facing the display portion of the same pixel as the wavelength selective reflection layer . Wherein the wavelength selective reflection layer, the liquid crystal device according to 請 Motomeko 1 ing from the cholesteric liquid crystal. Wherein the wavelength selective reflection layer, the surface of the liquid crystal device according to 請 Motomeko 1 or 2 formed on a surface of the flattened organic planarization layer.   The liquid crystal device according to claim 1, wherein a backlight is provided below the array substrate.   An electronic apparatus using the liquid crystal device according to claim 1.

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