KR20050057904A - Display apparatus - Google Patents

Abstract

A display device capable of improving light sensing characteristics is disclosed. The display panel is composed of red, green, and blue regions, and displays an image in response to a driving signal. The sensing unit is provided in the display panel corresponding to the green area and outputs a sensing signal in response to the first light incident from the outside. The driving unit outputs a driving signal in response to the detection signal. Therefore, the brightness of the light provided to the sensing unit can be increased, thereby improving the sensitivity of the sensing unit.

Description

Display device {DISPLAY APPARATUS}

The present invention relates to a display device, and more particularly, to a display device capable of improving light sensing characteristics.

In general, the touch panel is provided at the top of the display device to directly contact the hand and the object so that the instruction content displayed on the screen of the display device can be selected by a human hand or an object. The touch panel grasps the touched position, and the display device receives the content indicated at the touched position as an input signal and is driven according to the input signal.

Since a display device having a touch panel does not require a separate input device connected to the display device such as a keyboard and a mouse, its use is increasing.

However, the touch panel is provided on the display panel to increase the overall thickness of the display device.

Recently, as a kind of touch panel, a display device for detecting position information by sensing light provided by a user's operation has been developed. That is, the light sensing display device includes an optical sensor that outputs location information provided with light in response to light.

In the optical sensing display device, in order for the optical sensor to output accurate position information, the brightness of the light provided to the optical sensor must be increased to improve the optical sensing characteristics of the optical sensor.

Accordingly, it is an object of the present invention to provide a display device for improving light sensing characteristics.

According to an aspect of the present invention, a display device includes a display panel, a detector, and a driver.

The display panel includes red, green, and blue areas, and displays an image in response to a driving signal. The sensing unit is provided in the display panel corresponding to the green area and outputs a sensing signal in response to first light incident from the outside. The driving unit outputs the driving signal in response to the sensing signal.

According to such a display device, the sensing unit may be located in the green area to increase the luminance of the light provided to the sensing unit by a user's manipulation, thereby improving the sensitivity of the sensing unit.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is a block diagram of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the display device 500 according to an exemplary embodiment of the present invention may include a light generator 100 for providing a first light L1, a driver 200 for outputting a driving signal DS, and the The display panel 300 converts the first light L1 into a second light L2 including image information in response to the driving signal DS.

The display panel 300 includes a light detector LSP that outputs a photo current PC in response to the third light L3 provided to the display unit 300. The reader 400 outputs a position signal PS including position information provided with the third light L3 in response to the photocurrent PC output from the light detector LSP. The driver 200 outputs the driving signal DS for driving the display panel 300 in response to the position signal PS.

2 is a diagram illustrating a display device according to an exemplary embodiment, and FIG. 3 is a plan view of the display panel illustrated in FIG. 2.

2 and 3, the display device 500 according to an exemplary embodiment of the present invention receives an image of the light generating unit 100 generating the first light L1 and the first light L1 to receive an image. And a display panel 300 which is converted into second light L2 including information and outputs the converted light.

The display panel 300 includes a lower substrate 310, an upper substrate 320 facing the lower substrate 310, and a liquid crystal layer 330 interposed between the lower substrate 310 and the upper substrate 320. )

The upper substrate 320 includes a light blocking film 321, a color filter 322 made of red, green, and blue color pixels, and a common electrode 323. The upper substrate 320 includes red, green, and blue regions RCA, GCA, and BCA in which the red, green, and blue color pixels R, G, and B are formed.

The light blocking film 321 is provided between the color pixels to improve color reproducibility of each of the color pixels. The common electrode 323 is made of a transparent conductive material and is provided on the light blocking film 321 and the color filter 322.

The lower substrate 310 is formed in a matrix form and includes a plurality of pixel parts PP and a light sensing part LSP for displaying an image. Detailed structures of the plurality of pixel parts PP and the light sensing part LSP will be described in detail later with reference to FIGS. 4 and 5.

The third light L3 is light reflected by the reflective pen 600. When the user brings the reflective pen 600 close to the emission surface of the display panel 300 that outputs the second light L2, the reflective material 610 is provided at one end of the reflective pen 600. Reflects a part of the second light L2 toward the display panel 300. Here, the third light L3 is light that is reflected by the reflective pen 600 and is incident to the display panel 300 again.

Luminance is reduced when the first light L1 emitted from the light generator 100 is converted to the second light L2 through the display panel 300. The decrease in luminance occurs for each region of the display panel 300. That is, when the first light L1 passes through the red and blue regions RCA and BCA, the luminance decreases more significantly than when the first light L1 passes through the green region GCA. .

As a result, the light sensing unit LSP is provided in the green area GCA, and the light sensing unit LSP has a higher luminance than that provided in the red and blue areas RCA and BCA. The light L3 may be received. Therefore, the light sensing characteristic of the light sensing unit LSP may be improved.

4 is a cross-sectional view illustrating in detail the display panel illustrated in FIG. 2, and FIG. 5 is a plan view of the lower substrate illustrated in FIG. 4.

4 and 5, the display panel 300 includes a lower substrate 310, an upper substrate 320 facing the lower substrate 310, and a lower substrate 310 and the upper substrate 320. The liquid crystal layer 330 is interposed therebetween.

The lower substrate 340 is formed in a matrix form and has a plurality of pixel parts PP for displaying an image and a photocurrent PC in response to a third light L3 incident to the display panel 300. And a plurality of light sensing units LSP for outputting the same. Each of the light detectors LSP is provided in the green area GCA in which the green color G is formed.

Each of the pixel units 310 includes a thin film transistor (hereinafter, referred to as TFT) TR1 and a liquid crystal capacitor Clc connected to the pixel TFT TR1.

The pixel TFT TR1 includes a first gate electrode GE1, a first source electrode SE1, and a first drain electrode DE1 spaced apart from the first source electrode SE1. The pixel TFT TR1 outputs a data signal applied to the first source electrode SE1 to the first drain electrode DE1 in response to a gate driving signal applied to the first gate electrode GE1. The first drain electrode DE1 is electrically connected to the pixel electrode PE, which is the first electrode of the liquid crystal capacitor Clc, and the pixel electrode PE is output from the first drain electrode DE1. The data signal is applied.

The lower substrate 310 is provided with a protective film 313 provided on the pixel TFT TR1 to protect the pixel TFT TR1. The passivation layer 313 includes a silicon nitride layer (SiNx) and a silicon oxide layer (SiOx). An organic insulating layer 314 made of acrylic resin is formed on the passivation layer 313. The surface of the organic insulating layer 314 has a concave-convex structure.

In the passivation layer 313 and the organic insulating layer 314, a contact hole 314a for exposing the first drain electrode DE1 of the pixel TFT TR1 is formed. The pixel electrode PE is formed on the organic insulating layer 314. The pixel electrode PE includes a transparent electrode 315 made of a transparent conductive material and a reflective electrode 316 made of a reflective material.

The transparent electrode 315 is stacked with a uniform thickness on the drain electrode DE1 exposed through the organic insulating layer 314 and the contact hole 314a, and the reflective electrode 316 is formed thereon. The reflective electrode 316 is formed with a first opening window 316a exposing a portion of the transparent electrode 315. Accordingly, the lower substrate 310 includes a reflection area RA in which the reflective electrode 316 is formed and a transmission area TA in which the first opening window 316a is formed.

The photo detector LSP may include a sensing data line SLdata, a first sensing gate line SLgate-off, a second sensing gate line SLgate-oon, a readout line SLreadout, a sensing TFT TR2, Storage capacitor Cs and switching TFT TR3.

The sensing TFT TR2 is spaced apart from the gate electrode GE2 connected to the first sensing gate line SLgate-off, the drain electrode DE2 branched from the sensing data line SLdata, and the drain electrode DE2. Source electrode SE2. An off voltage is always applied to the first sensing gate line SLgate-off. The photocurrent PC generated from the sensing TFT TR2 by the third light L3 is output to the source electrode SE2.

The storage capacitor Cs includes a lower electrode LE provided on the same layer as the gate electrode GE2 of the sensing TFT TR2 and an upper electrode extending from the source electrode SE2 of the sensing TFT TR2. (UE) and the gate insulating film GI interposed between the lower electrode LE and the upper electrode UE. The storage capacitor Cs receives and stores the photocurrent PC output from the sensing TFT TR2 through the upper electrode UE.

The switching TFT TR3 is spaced apart from the gate electrode GE3 branched from the gate line GL, the drain electrode DE3 and the drain electrode DE3 extending from the upper electrode UE of the storage capacitor Cs. It consists of the source electrode SE3. The switching TFT TR3 outputs the photocurrent PC stored in the storage capacitor Cs through the source electrode SE3 in response to an ON signal applied to the second sensing gate line SLgate-on. do.

In this case, the source electrode SE3 of the switching TFT TR3 is electrically connected to the leadout line SLreadout, and the photocurrent PC output from the source electrode SE3 is the leadout line SLreadout. Is transmitted to the reader 400 (shown in FIG. 1).

Referring back to FIG. 4, the light sensing unit LSP is provided in the reflection area RA even in the green area GCA, and the aperture ratio of the display device 500 is determined by the light sensing unit LSP. The fall can be prevented. In this case, a second opening window 316b exposing the sensor TFT TR2 of the light sensing unit LSP is formed in the reflective electrode 316. Therefore, the third light L3 may be provided to the light sensing unit LSP through the second opening window 316b.

6 is a diagram illustrating a display device according to another exemplary embodiment of the present invention, and FIG. 7 is a plan view of the upper substrate illustrated in FIG. 6. However, the same reference numerals are given to the same components as those shown in FIGS. 2 to 5, and detailed description thereof will be omitted.

Referring to FIG. 6, a display device 510 according to another embodiment of the present invention may include a lower substrate 310, an upper substrate 340 facing the lower substrate 310, and a lower substrate 310 and an upper substrate. And a display panel 300 formed of the liquid crystal layer 330 interposed therebetween.

The lower substrate 310 includes a reflective region RA having a reflective electrode 316 and a transparent region TA having an opening window 316a exposing the transparent electrode 315.

The upper substrate 340 includes a light blocking film 341, a color filter 342, a planarization film 343, and a common electrode 344 on the stacking surface 340a adjacent to the liquid crystal layer 330. The color filter 342 is composed of red, green, and blue color pixels (R, G, B), and the upper substrate 340 is formed of red, green, and blue color pixels (R, G, B). , Green and blue areas (RCA, GCA, BCA).

The first light L1 emitted from the light generator 100 disposed on the rear surface of the lower substrate 310 and incident on the display panel 300 passes through the transmission electrode 315 and then receives image information. It is emitted from the display panel 300 as a second light included. Meanwhile, after the fourth light L4 incident through the upper substrate 340 is reflected by the reflective electrode 316, the fourth light L4 is reflected from the display panel 300 as the fifth light L5 including image information. It is emitted.

As described above, the second light L2 passes through the color filter 342 provided on the upper substrate 340 once, but the fifth light L5 passes through the color filter 342. It is the light that passed twice. Due to the difference in the number of times passing through the color filter 342, a difference in color visibility occurs between the transmission area TA and the reflection area RA. Therefore, the color filter 342 is partially removed in response to the reflection area RA.

6 and 7, in the red pixel R, a first hole H1 exposing the stack surface 340a of the upper substrate 340 is formed, and the blue color B is formed. ) Is formed a second hole H2 exposing the stacking surface 340a, and a third hole H3 exposing the stacking surface 340a is formed in the green color pixel G.

The first to third holes H1 to H3 have different sizes. In particular, the size of the third hole H3 formed in the green color pixel G is largest. The green pixel G has a smaller change in color coordinates in preparation for a change in area than the red and blue color pixels R and B. Therefore, it is preferable to reduce the area of the green color pixel G to be larger than the area of the red and blue color pixels R and B.

The sizes of the first to third holes H1 to H3 decrease in the order of the second hole H2, the first hole H1, and the third hole H3, and thus the red, green, and blue color pixels. The area of (R, G, B) increases in the order of green (G)-> red (R)-> blue (B) color pixels. As a result, it is possible to reduce the difference in color visibility and luminance occurring between the red, green, and blue color pixels R, G, and B.

The planarization layer 343 is provided on the stacking surface 340a, the light blocking layer 341, and the color filter 342 exposed by the first to third holes H1 to H3, and has a flat surface structure. Has Accordingly, the planarization layer 343 may have a step difference between the light blocking layer 341 and the color filter 342 and the stacking surface 340a exposed by the first to third holes H1 to H3. The step that occurs between the color filter 342 is removed. Thereafter, the common electrode 344 made of a transparent conductive material is stacked on the planarization layer 343 with a uniform thickness.

On the other hand, the light sensing unit LSP of the lower substrate 310 is provided corresponding to the green area GCA in which the green color G is formed among the red, blue, and green color pixels R, B, and G. do. The luminance reduction ratio of the light passing through the color filter 342 is reduced in the green pixel G than the red and blue color pixels R and B. Accordingly, since the light detector LSP is provided in the green area GCA, the luminance of the third light L3 provided to the light detector LSP may be reduced.

In particular, the light detector LSP is provided in an area in which the third hole H3 is formed in the green area GCA. The region in which the third hole H3 is formed is a region in which the green color G is removed, and the region in which the luminance decrease is the smallest in the green region GCA. Therefore, the brightness of the third light L3 provided to the light sensing unit LSP may be increased, thereby improving the sensitivity of the light sensing unit LSP.

Although not shown, the third light L3 may be external light present in an environment in which the display device 500 is used.

2 to 7 illustrate a transflective display device in which the display panel 300 is defined as a reflective area RA and a transmissive area TA, the transflective display device is only one embodiment of the present invention. Can be sufficiently applied to a transmissive or reflective display device.

According to such a display device, a display panel including an upper substrate and a lower substrate is formed of red, blue, and green regions, and a light sensing unit is formed on the lower substrate corresponding to the green region.

Therefore, the light generated by the user's manipulation passes through the green area and is provided to the light sensing unit. As a result, the luminance of the light provided to the light sensing unit may be increased, thereby improving the sensitivity of the light sensing unit.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

1 is a block diagram of a display device according to an exemplary embodiment of the present invention.

2 is a diagram illustrating a display device according to an exemplary embodiment of the present invention.

3 is a plan view of the display panel illustrated in FIG. 2.

4 is a cross-sectional view illustrating in detail the display panel illustrated in FIG. 2.

FIG. 5 is a circuit diagram of the light detector illustrated in FIG. 4.

6 is a diagram illustrating a display device according to another exemplary embodiment of the present invention.

FIG. 7 is a plan view of the upper substrate illustrated in FIG. 6.

<Explanation of symbols for the main parts of the drawings>

100: light generating unit 200: driving unit

300: display panel 310: lower substrate

320: upper substrate 400: reading part

500: display device LSP: light detector

PP: pixel part

Claims (5)

A display panel including red, green, and blue regions and emitting first light including image information in response to a driving signal; A sensing unit provided in the display panel corresponding to the green area and outputting a sensing signal in response to the second light incident from the outside; And And a driving unit which outputs the driving signal in response to the sensing signal. The display panel of claim 1, wherein the display panel comprises: A lower substrate including a pixel TFT, a plurality of pixel parts including a pixel electrode coupled to the pixel TFT, and the sensing part; And And an upper substrate having a color filter including a red pixel formed in the red region, a green color formed in the green region, and a blue color pixel formed in the blue region, and a common electrode provided on the color filter. Display. The display device of claim 2, wherein the pixel electrode includes a transmissive electrode and a reflective electrode formed on the transmissive electrode and having an opening window partially exposing the transmissive electrode. The method of claim 3, wherein the green color pixel is partially removed from an area where the reflective electrode is formed. And the sensing unit corresponds to a region from which the green color pixel is removed. The display apparatus of claim 1, wherein the second light is a part of the first light that is reflected and incident to the display panel by a user's manipulation.