TWI689861B - Display panel and opposite substrate thereof - Google Patents

Abstract

An opposite substrate is provided. The opposite substrate includes a support board, a plurality of touch-sensing pads, a plurality of first conductive layers, at least one photo-sensing layer, and at least one second conductive layer. The touch-sensing pads, the first conductive layers and the photo-sensing layer are formed on the flat surface of the support board. The touch-sensing pads are transparent. The first conductive layers are connected to the touch-sensing pads respectively, whereas the second conductive layer is connected to the photo-sensing layer. In addition, a display panel including the opposite substrate is provided.

Description

Display panel and its opposite substrate

The present invention relates to a display, and particularly to a display panel and its counter substrate.

At present, some mobile phones already have the function of screen brightness adjustment, and the screen brightness of such mobile phones can change with the intensity of ambient light. Such a mobile phone with an ambient light modulation function usually has an ambient light sensor (ALS), which is, for example, a photo diode. The ambient light sensor can receive light from the external environment to sense the intensity of ambient light. In this way, the mobile phone can adjust the screen brightness according to the change of the ambient light intensity.

The invention provides a counter substrate of a display panel, which includes a touch sensing pad and a light sensing layer, so that the display panel can provide touch and ambient light modulation functions.

The present invention provides a display panel including the above-mentioned counter substrate.

The counter substrate provided by the present invention includes a supporting plate, a plurality of touch sensing pads, a plurality of first conductive layers, at least one light sensing layer, and at least one second conductive layer. The support plate has a flat surface. The touch sensing pads, the first conductive layers and the at least one light sensing layer are all formed on the plane of the support plate. These touches The control sensing pads are all transparent. The first conductive layers are electrically connected to the touch sensing pads, respectively, and the second conductive layer is electrically connected to the light sensing layer.

In an embodiment of the invention, the counter substrate further includes a first insulating layer and a second insulating layer. Both the first insulating layer and the second insulating layer are formed on the plane of the support plate. The first insulating layer covers the touch sensing pads and at least one light sensing layer. The second insulating layer covers the first insulating layer, wherein at least one second conductive layer is disposed on the second insulating layer, and sequentially passes through the second insulating layer and the first insulating layer to electrically connect to the at least one light sensing layer.

In an embodiment of the invention, a portion of each first conductive layer is formed between the first insulating layer and the second insulating layer.

In an embodiment of the invention, the counter substrate further includes a plurality of conductive pads. The conductive pads are electrically connected to the first conductive layers, wherein the plane has a display area and a non-display area around the display area, and the conductive pads are disposed in the non-display area.

In an embodiment of the invention, the first conductive layers and the touch sensing pads are made of transparent conductive layers.

In an embodiment of the present invention, when the touch sensing pads are not performing touch sensing, the second conductive layer supplies a bias voltage to the light sensing layer. When these touch sensing pads perform touch sensing, the second conductive layer stops supplying the bias voltage to the light sensing layer.

In an embodiment of the present invention, each light sensing layer is located between the adjacent second conductive layer and the touch sensing pad.

The display panel provided by the present invention includes the above-mentioned counter substrate and a control substrate, wherein the control substrate is connected to the counter substrate, and the counter substrate is electrically connected via the conductive pads.

In an embodiment of the invention, the control substrate further includes a plurality of conductive bumps, wherein the conductive bumps are electrically connected to the conductive pads, respectively.

The counter substrate of the present invention uses a touch sensing pad and a light sensing layer, so that the counter substrate can not only touch the position of an object (such as a hand or a stylus), but also sense ambient light The intensity of the display panel allows the display panel to touch and adjust the brightness of the screen according to the ambient light.

To make the above and other objects, features, and advantages of the present invention more comprehensible, embodiments are described below in conjunction with the accompanying drawings, which are described in detail below.

10: Hand

20: signal processing unit

100: display panel

200, 400: opposite substrate

210: support plate

211: Flat

212: Touch surface

220: Touch sensing pad

230: Light sensing layer

241, 441: first conductive layer

242: second conductive layer

242a: surface

251: first insulating layer

252: Second insulating layer

260: conductive pad

300: control board

310: carrier board

314: buffer layer

320: channel layer

321, 341b, 342b, 343b, 361: cushion

341: Gate

342d: Drain

342s: source

343: conductive layer

344: conductive pattern layer

344a: anode

345: cathode

351: First gate insulating layer

352: Second gate insulating layer

353: Interlayer insulation

354: Flat layer

354b: bump

356: Pixel definition layer

360: conductive bump

369: Interlayer metal layer

370: Organic light-emitting layer

390: spacer

A11: Display area

A12: Non-display area

H56: opening

I21: Photocurrent

LH3, LL3: ambient light

FIG. 1A is a schematic top view of a display panel according to an embodiment of the invention.

FIG. 1B is a schematic cross-sectional view taken along the line 1B-1B in FIG. 1A.

FIG. 2 is a schematic cross-sectional view of the display panel in FIG. 1B when performing touch sensing.

3A and 3B are schematic cross-sectional views of the display panel in FIG. 1B when adjusting screen brightness according to ambient light.

4 is a schematic cross-sectional view of an opposite substrate according to another embodiment of the invention.

In the following text, the same element will be denoted by the same element symbol. Secondly, in order to clearly present the technical features of the present case, the dimensions (such as length, width, thickness, and depth) of elements (such as layers, films, substrates, and regions, etc.) in the drawings will be enlarged in unequal proportions. Therefore, the description and explanation of the following embodiments are not limited to the sizes and shapes presented by the elements in the drawings, but should cover the sizes, shapes, and deviations of the two due to actual manufacturing processes and/or tolerances. For example, the flat surface shown in the drawings may have rough and/or non-linear characteristics, and the acute angle shown in the drawings may be round. Therefore, the elements presented in the drawings in this case are mainly for illustration, and are not intended to accurately depict the actual shape of the elements, nor are they intended to limit the scope of patent applications in this case.

Secondly, the words "about", "approximately", or "substantially" appearing in the content of this case not only cover the clearly stated values and range of values, but also include those with ordinary knowledge in the technical field to which the invention belongs. The allowable deviation range, which can be determined by the error generated during the measurement, and the error is caused by the limitation of both the measurement system or the process conditions, for example. In addition, "about" may be expressed within one or more standard deviations of the above values, such as within ±30%, ±20%, ±10%, or ±5%. The words "about", "approximately" or "substantially" appearing in this text can choose acceptable deviation range or standard deviation according to optical properties, etching properties, mechanical properties or other properties, not just one Standard deviation to apply all the above optical properties, etching properties, mechanical properties and other properties.

FIG. 1A is a schematic top view of a display panel according to an embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view taken along the line 1B-1B in FIG. 1A, where FIG. 1B only shows a partial cross-sectional structure of the display panel 100. 1A and 1B, the display panel 100 includes a counter substrate 200 and a control substrate 300, wherein the counter substrate 200 and the control substrate 300 are arranged to face each other, and the control substrate 300 is connected to the counter substrate 200. For example, both the counter substrate 200 and the control substrate 300 can be connected to each other with a sealant (not shown).

The counter substrate 200 has functions of touch sensing and ambient light sensing. In detail, the counter substrate 200 includes a supporting plate 210, a plurality of touch sensing pads 220 and at least one light sensing layer 230, wherein the supporting plate 210 may be transparent. For example, the support plate 210 may be a glass plate or a sapphire substrate. The support plate 210 has a flat surface 211 facing the control substrate 300, and the flat surface 211 has a display area A11 and a non-display area A12 located around the display area A11. The touch-sensing pad 220 and the light-sensing layer 230 are both formed on the plane 211 of the support plate 210, and both can be located in the display area A11. In addition, the touch sensing pad 220 may be disposed between the light sensing layer 230 and the plane 211 of the support plate 210, as shown in FIG. 1B.

Although FIG. 1A does not show the light-sensing layer 230, and FIG. 1B only shows one light-sensing layer 230, in this embodiment, at least two touch-sensing pads 220 can each be located in the corresponding light-sensing layer. Between layer 230 and plane 211. In other words, at least two touch-sensing pads 220 can be in one-to-one contact with at least The measurement layers 230 are stacked on each other. Therefore, the opposite substrate 200 may include one or at least two light sensing layers 230, and the single light sensing layer 230 in FIG. 1B does not limit the number of the light sensing layers 230 included in the opposite substrate 200. In addition, the eight touch sensing pads 220 shown in FIG. 1A also do not limit the number of touch sensing pads 220 included in the counter substrate 200.

The support plate 210 also has a touch surface 212 which is opposite to the plane 211. In the display panel 100, the touch surface 212 is not only available for the user to perform touch operations, but also the image generated by the display panel 100 is displayed on the touch surface 212, that is, the user can view the display panel 100 from the touch surface 212 The provided image, and ambient light from outside (shown in subsequent drawings) enters the support plate 210 from the touch surface 212. These touch sensing pads 220 are all transparent. For example, the touch sensing pads 220 may be transparent conductive layers, which may be made of transparent conductive oxides (TCO) such as indium tin oxide (ITO) or indium zinc oxide (Indium Zinc Oxide). to make.

Since the touch sensing pad 220 is transparent, when ambient light enters from the touch surface 212, it can penetrate the touch sensing pad 220 and be incident on the light sensing layer 230. In this way, the light-sensing layer 230 can receive ambient light, thereby sensing the ambient light. The light-sensing layer 230 may have the characteristics of photoelectric effect, and have a material sensitive to light, such as silicon-rich oxide (SRO) or silicon material, wherein the silicon material may be amorphous silicon, single crystal silicon or Polycrystalline silicon. When external ambient light irradiates the light sensing layer 230, the light sensing layer 230 can generate photoelectrons, and the number of photoelectrons changes according to the intensity of the ambient light. The higher the intensity of ambient light, the greater the number of photoelectrons. Conversely, the lower the intensity of ambient light, the fewer the number of photoelectrons.

The counter substrate 200 further includes a plurality of first conductive layers 241 and at least one second conductive layer 242, wherein the first conductive layers 241 and the second conductive layers 242 are formed on the plane 211 of the support plate 210. The first conductive layers 241 are electrically connected to the touch sensing pads 220 respectively, and the light sensing layer 230 is located between the adjacent second conductive layer 242 and the touch sensing pad 220. The second conductive layer 242 is electrically connected to the photo-sensing layer 230 and can supply a bias to the photo-sensing layer 230 to drive the photoelectrons to move, thereby forming a photocurrent.

Although FIG. 1A does not show the second conductive layer 242, and FIG. 1B only shows one second conductive layer 242, in this embodiment, the opposite substrate 200 may include a plurality of second conductive layers 242 and a plurality of light sensing The sensing layer 230, wherein the second conductive layers 242 are electrically connected to the light sensing layers 230, respectively, and each light sensing layer 230 is located between the adjacent second conductive layer 242 and the touch sensing pad 220. Therefore, the single second conductive layer 242 in FIG. 1B does not limit the number of second conductive layers 242 included in the opposite substrate 200.

The opposite substrate 200 may further include a first insulating layer 251 and a second insulating layer 252, wherein the first insulating layer 251 and the second insulating layer 252 are both formed on the plane 211 of the support plate 210. Both the first insulating layer 251 and the second insulating layer 252 may be oxide layers or nitride layers, such as silicon oxide or silicon nitride, and the first insulating layer 251 and the second insulating layer 252 may be made of the same material or different. The first insulating layer 251 covers the touch sensing pads 220 and the light sensing layers 230, and the second insulating layer 252 covers the first insulating layer 251. A part of each first conductive layer 241 may be formed between the first insulating layer 251 and the second insulating layer 252, and another part of each first conductive layer 241 may pass through the first insulating layer 251 to be electrically connected to the touch sensing Pad 220, as shown in FIG. 1B. The second conductive layer 242 is disposed on the second insulating layer 252 and sequentially passes through the second insulating layer 252 and the first insulating layer 251 to be electrically connected to the light sensing layer 230.

The opposite substrate 200 further includes a plurality of conductive pads 260 disposed in the non-display area A12, and the control substrate 300 includes a plurality of conductive bumps 360. The conductive bumps 360 can be aligned with the conductive pads 260 and contact the conductive pads 260 respectively. For example, the conductive bumps 360 can be aligned and contacted with the conductive pads 260 one-to-one. As such, the conductive bumps 360 are electrically connected to the conductive pads 260 respectively, so that the control substrate 300 can be electrically connected to the counter substrate 200 via the conductive pads 260.

A plurality of conductive pads 260 are electrically connected to the first conductive layers 241, so that the first conductive layers 241 can electrically connect the conductive pads 260 and the touch sensing pads 220, wherein the conductive pads 260 can penetrate the second The insulating layer 252 is electrically connected to the first conductive layer 241. In this embodiment, using the first conductive layers 241, a plurality of conductive pads 260 can be electrically connected to the touch-sensing pads 220 one-to-one, but such conductive The electrical connection between the pad 260 and the touch sensing pad 220 is not used to limit other embodiments, as shown in FIG. 1B.

It should be noted that, in at least one embodiment, some conductive pads 260 may be electrically connected to all the first conductive layers 241, but other conductive pads 260 are not electrically connected to the first conductive layer 241. That is to say, not every conductive pad 260 will electrically connect the first conductive layer 241 and the touch sensing pad 220. In addition, the number of conductive pads 260 may be equal to the number of conductive bumps 360, but the number of conductive pads 260 may be greater than the number of touch sensing pads 220.

The first conductive layer 241 may be a metal layer, and has good conductivity. When the conductivity of the first conductive layer 241 made of metal is higher than that of the touch sensing pad 220 made of transparent conductive oxide, the impedance of the first conductive layer 241 will be lower than that of the touch sensing pad 220 The impedance facilitates the transmission of the touch signal generated by the touch sensing pad 220, and helps to maintain the integrity of the touch signal.

1B, the display panel 100 may be a liquid crystal display panel (Liquid Crystal Display Panel, LCD Panel), an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display panel or a micro-LED, μLED) display panel, and in the embodiment shown in FIG. 1B, the display panel 100 is an organic light emitting diode (OLED) display panel as an example. Therefore, it is emphasized here that FIG. 1B is for illustration only, and the display panel 100 is not limited to an organic light-emitting diode display panel.

In the display panel 100, the control substrate 300 further includes a carrier board 310, and a buffer layer 314 formed on the carrier board 310, wherein the buffer layer 314 can cover the carrier board 310 in its entirety. The control substrate 300 further includes a plurality of channel layers 320, a plurality of pad layers 321, and a first gate insulating layer 351. Since FIG. 1B only shows a partial cross-sectional structure of the display panel 100, FIG. 1B only shows one channel layer 320 and one cushion layer 321. However, in an actual situation, the control substrate 300 includes a plurality of channel layers 320 and a plurality of pad layers 321. The channel layer 320, the pad layer 321 and the first gate insulating layer 351 are all formed on the buffer layer 314, wherein the channel layer 320 and the pad layer 321 can be formed by lithography and etching of the same semiconductor layer.

The control substrate 300 further includes a plurality of gate electrodes 341, a plurality of pad layers 341b and a second gate insulating layer 352. Since FIG. 1B only shows a partial cross-sectional structure of the display panel 100, FIG. 1B only shows one gate electrode 341 and one pad layer 341b. The gate electrodes 341, the pad layers 341b and the second gate insulating layer 352 are all formed on the first gate insulating layer 351, wherein the second gate insulating layer 352 can cover the gate electrodes 341, the pad layers 341b and the first A gate insulating layer 351, and the gate 341 and the pad layer 341b can be formed by lithography and etching of the same metal layer.

The control substrate 300 further includes a plurality of interlayer metal layers (interlayer metal layer) 369 and interlayer dielectric layers (interlayer dielectric layer) 353. In the partial cross-sectional structure of the display panel 100 shown in FIG. 1B, FIG. 1B only shows one interlayer The metal layer 369, but the actual control substrate 300 includes a plurality of interlayer metal layers 369. The interlayer metal layer 369 and the interlayer insulating layer 353 are formed on the second gate insulating layer 352, wherein the interlayer insulating layer 353 covers the interlayer metal layer 369 and the second gate insulating layer 352.

The control substrate 300 further includes a plurality of pad layers 342b, a plurality of source electrodes 342s, a plurality of drain electrodes 342d, and a flat layer 354. Although the control substrate 300 shown in FIG. 1B includes the pad layer 342b, the source electrode 342s, and the drain electrode 342d, the number of each is one, but the actual control substrate 300 includes a plurality of pad layers 342b, a plurality of source electrodes 342s and multiple drains 342d. The flat layer 354 and the pad layers 342b are formed on the interlayer insulating layer 353, and the flat layer 354 covers the pad layers 342b, the source electrodes 342s, and the drain electrodes 342d. In addition, the pad layers 342b, the source electrodes 342s and the drain electrodes 342d can be formed by lithography and etching of the same metal material, where the metal material can be generated by physical vapor deposition (PVD), and The aforementioned physical vapor deposition is, for example, sputtering or evaporation.

A part of each source 342s is formed between the flat layer 354 and the interlayer insulating layer 353, and the other part of each source 342s passes through the interlayer insulating layer 353, the second gate insulating layer 352, and the first gate insulating layer 351 Whereas, the channel layer 320 is electrically connected. Similarly, a portion of each drain 342d is formed between the flat layer 354 and the interlayer insulating layer 353, while the other portion of each drain 342d passes through the interlayer insulating layer 353, the second gate insulating layer 352, and the first gate The insulating layer 351 is electrically connected to the channel layer 320, in which the interlayer insulating layer 353. The second gate insulating layer 352 and the first gate insulating layer 351 are formed by etching to form a plurality of holes (not shown), and the source electrode 342s and the drain electrode 342d can extend to the holes and pass through the holes. Through the interlayer insulating layer 353, the second gate insulating layer 352 and the first gate insulating layer 351.

The gate electrode 341 is located between the adjacent drain electrode 342d and source electrode 342s, as shown in FIG. 1B. Since the gate electrode 341 is located between the adjacent drain electrode 342d and the source electrode 342s, the drain electrode 342d and the source electrode 342s are both electrically connected to the channel layer 320, and the second gate insulating layer 352 is sandwiched between the gate electrode 341 and the channel layer 320 Therefore, the gate electrode 341, the drain electrode 342d, the source electrode 342s, and the channel layer 320 can form a field-effect transistor (FET).

In the partial cross-sectional structure of the display panel 100 shown in FIG. 1B, the control substrate 300 further includes a conductive layer 343, a pad layer 343b, a conductive pattern layer 344, an organic light-emitting layer 370, a cathode 345, and a pixel definition layer 356. In this case, the number of the conductive layer 343, the pad layer 343b, and the organic light-emitting layer 370 included in the control substrate 300 are multiple. The pad layer 343b, the conductive pattern layer 344, the organic light emitting layer 370, the cathode 345, and the pixel definition layer 356 are all formed on the flat layer 354, wherein a part of the conductive layer 343 is formed on the flat layer 354, and the other part of the conductive layer 343 is worn The drain electrode 342d is electrically connected through the flat layer 354. The flat layer 354 has a plurality of holes (not labeled), and the conductive layer 343 can pass through the flat layer 354 through the holes, wherein the holes can be formed by etching. In addition, the control substrate 300 may further include a plurality of spacers 390, wherein the spacers 390 are disposed on the pixel definition layer 356, and may be made of photoresist.

The conductive pattern layer 344 may be formed by lithography and etching of the same conductive layer, and may include a plurality of pad layers 361 and a plurality of anodes 344a (FIG. 1B shows one pad layer 361 and one anode 344a). The anode 344a is formed on the conductive layer 343, and is electrically connected to the conductive layer 343. Since the conductive layer 343 is electrically connected to the drain electrode 342d, the anode 344a may be electrically connected to the drain electrode 342d via the conductive layer 343. The organic light emitting layer 370 is formed on the anode 344a and has an organic light emitting diode structure, and the cathode 345 is formed on the organic light emitting layer 370 so that the organic light emitting layer 370 is formed between the cathode 345 and the anode 344a. The organic light-emitting layer 370 is electrically connected to the anode 344a, and the anode 344a is electrically connected to the drain 342d, so the gate 341, the drain 342d, and the source 342s The field effect transistor formed with the channel layer 320 can electrically connect the organic light emitting layer 370 and the anode 344a, and can control the light emission of the organic light emitting layer 370, so that the display panel 100 can display an image.

The pixel definition layer 356 has a plurality of openings H56 (only one is shown in FIG. 1B), and the organic light-emitting layers 370 are respectively disposed in the openings H56. These openings H56 extend to the anode 344a, so that the pixel definition layer 356 partially covers the anode 344a, but not completely covers the anode 344a, so that the organic light-emitting layer 370 in the opening H56 can be electrically connected to the anode 344a. In addition, the cathode 345 also extends into the opening H56 to electrically connect the organic light-emitting layer 370 so that the organic light-emitting layer 370 can be positioned between the cathode 345 and the anode 344a, and electrically connect the cathode 345 and the anode 344a.

The flat layer 354 may have a plurality of bumps 354b, and these bumps 354b will protrude from the pixel definition layer 356. The pad layers 343b and the pad layers 361 are respectively formed on the bumps 354b and cover the bumps 354b, wherein the pad layer 343b is sandwiched between the pad layers 361 and the bumps 354b, and the bumps 354b, the pads The layer 343b and the pad layers 361 can form a plurality of conductive bumps 360. The pad layer 361 can be electrically connected to the circuit in the control substrate 300, such as the conductive layer 343, so that the conductive bump 360 and the conductive pad 260 are electrically connected. In this way, by using the conductive pads 260 and the conductive bumps 360, the opposite substrate 200 can be electrically connected to the control substrate 300, and touch signals can be transferred from the opposite substrate 200 to the control via the conductive pads 260 and the conductive bumps 360 Substrate 300.

FIG. 2 is a schematic cross-sectional view of the display panel in FIG. 1B when performing touch sensing. Please refer to FIGS. 1B and 2, the display panel 100 can be electrically connected to the signal processing unit 20, wherein the signal processing unit 20 can be electrically connected to the control substrate 300 and has a function of processing touch signals generated by the touch sensing pad 220. For example, the signal processing unit 20 may be a Touch and Display Driver Integration (TDDI), but this does not limit the type of the signal processing unit 20. The signal processing unit 20 can be directly mounted on the control substrate 300 or connected to the control substrate 300 via an electrical connector (not shown), wherein the electrical connector is, for example, a flexible printed circuit board (Flexible Printed Circuit) , FPC).

When an object, such as the hand 10 or stylus shown in FIG. 2, touches the touch surface 212 of the opposite substrate 200, the object (such as the hand 10) and the touch sensing pad 220 directly below it Capacitors are formed so that the touch sensing pad 220 can generate touch signals. Since the conductive bump 360 and the conductive pad 260 are electrically connected, the above-mentioned touch signal can be sequentially transmitted to the control substrate 300 through the first conductive layer 241, the conductive pad 260 and the conductive bump 360. The signal processing unit 20 can receive the touch signal from the control substrate 300 and process the touch signal. In this way, the signal processing unit 20 can know the position of the object (such as the hand 10) on the touch surface 212 from the touch signal, so that the user can touch and operate the display panel 100.

It should be noted that, in this embodiment, the touch sensing pad 220 may be electrically connected to the light sensing layer 230. For example, the touch sensing pad 220 and the light sensing layer 230 may be electrically connected to each other due to the contact between the two. When the touch-sensing pads 220 perform touch sensing, the second conductive layers 242 stop supplying bias to the light-sensing layers 230 to avoid interference by the photocurrent generated by the light-sensing layer 230. Conversely, when the touch-sensing pads 220 are not touch-sensing, the second conductive layers 242 supply bias to the light-sensing layers 230 to sense the intensity of ambient light, so that the signal processing unit 20 can The intensity of the ambient light is used to brighten or dimme the screen brightness of the display panel 100.

Specifically, during the touch sensing process of the touch sensing pads 220, the signal processing unit 20 scans the touch sensing pads 220 within a period of time. In the interval between two adjacent cycle times, the signal processing unit 20 may suspend scanning the touch sensing pad 220. At this time, the second conductive layer 242 may supply a bias voltage to the light sensing layer 230 to sense the intensity of ambient light. The second conductive layer 242 may supply a bias voltage to the light sensing layer 230 after at least one cycle time has passed. For example, the second conductive layer 242 may supply a bias voltage to the light sensing layer 230 after one, two, three, or four cycle times have passed. In addition, the time required for the light sensing layer 230 to sense the ambient light intensity may be between about 10 microseconds and 100 microseconds, but the time required for the light sensing layer 230 to sense the ambient light intensity may also be in other time ranges That is, the above time range is not used to limit the sensing of the ambient light intensity by the light sensing layer 230.

3A and 3B are schematic cross-sectional views of the display panel in FIG. 1B when ambient light is adjusted, wherein FIG. 3A illustrates the display panel 100 in a bright environment, and FIG. 3B illustrates the display panel 100 in a dim environment. . Referring to FIG. 3A, when the display panel 100 is in a bright environment, ambient light LH3 from the outside is incident on the light sensing layer 230 after penetrating the support plate 210 and the touch sensing pad 220, wherein the ambient light LH3 has a relatively With high intensity, the light sensing layer 230 can be excited by ambient light LH3 with more photoelectrons.

At this time, the bias voltage received by the light-sensing layer 230 from the second conductive layer 242 can drive these photoelectrons to generate a larger photocurrent I21, wherein the photocurrent I21 will sequentially pass through the touch-sensing pad 220, the first A conductive layer 241, a conductive pad 260, and a conductive bump 360 (please refer to FIG. 1B) are transferred to the control substrate 300, and an ambient light signal is formed. The signal processing unit 20 receives and processes the ambient light signal, and adjusts the screen brightness of the display panel 100 according to the ambient light signal. In the embodiment shown in FIG. 3A, since the ambient light LH3 has a high intensity, the signal processing unit 20 can brighten the screen brightness of the display panel 100 to improve the screen contrast under high ambient light intensity.

Referring to FIG. 3B, when the display panel 100 is in a dim environment, ambient light LL3 having a lower intensity is incident on the light sensing layer 230 after penetrating the support plate 210 and the touch sensing pad 220, so the light sensing layer 230 Less photoelectrons can be excited by the ambient light LH3, so that the light-sensing layer 230 that receives the bias voltage will generate a smaller photocurrent I21, which will also pass through the touch-sensing pad 220 and the first conductive layer 241 in sequence , The conductive pad 260 and the conductive bump 360 (please refer to FIG. 1B) are transferred to the control substrate 300, and an ambient light signal is formed. The signal processing unit 20 receives and processes the ambient light signal, and adjusts the screen brightness of the display panel 100 according to the ambient light signal. In the embodiment shown in FIG. 3B, since the ambient light LL3 has a low intensity, the signal processing unit 20 can dim the screen brightness of the display panel 100 to save the power required by the display panel 100.

In particular, in the embodiments shown in FIGS. 3A and 3B, when the display panel 100 is undergoing ambient light modulation, the touch sensing pads 220 will not perform touch sensing, that is, the signal processing unit 20 Scanning the touch sensing pads 220 will be suspended until the second conductive layer 242 suspends the supply of the bias voltage to the light sensing layer 230 to avoid interference with the light sensing layer 230's sensing of ambient light (such as ambient light LH3 or LL3) .

4 is a schematic cross-sectional view of an opposite substrate according to another embodiment of the invention. Referring to FIG. 4, the counter substrate 400 of this embodiment is similar to the counter substrate 200 of the previous embodiment, and the counter substrate 400 can also be connected to the control substrate 300 or other types of control substrates to form a display panel, such as a liquid crystal display LCD panel, organic light-emitting diode display panel or miniature light-emitting diode display panel. The main difference between the counter substrate 400 and the counter substrate 200 is that the counter substrate 400 does not have a first conductive layer 241 made of metal, and the counter substrate 400 includes a plurality of first conductive layers 441 and a plurality of The touch sensing pads 220 are all made of transparent conductive layers.

In this embodiment, the transparent conductive layer may be a transparent conductive oxide, such as indium tin oxide (ITO) or indium zinc oxide (IZO), but the transparent conductive layer is not limited to a transparent conductive oxide. The first conductive layer 441 and the touch sensing pad 220 may be formed by the same layer of transparent conductive oxide after lithography and etching, so the first conductive layer 441 and the touch sensing pad 220 may be integrally formed (be integrally formed into one). In other words, both the first conductive layer 441 and the touch-sensing pad 220 are not only made of the same material (ie, transparent conductive layer), but also between the first conductive layer 441 and the touch-sensing pad 220 Form an obvious boundary.

In summary, in the display panel disclosed in the above embodiments, since the counter substrate includes the touch sensing pad and the light sensing layer, the counter substrate can not only touch the sensing object (such as the hand 10 or touch The location of the pen), and can also sense the intensity of the ambient light, so that the display panel has functions of touch control and screen brightness adjustment according to the ambient light.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make some modifications and retouching without departing from the spirit and scope of the present invention. The scope of protection of invention shall be subject to the scope defined in the appended patent application.

20: signal processing unit

100: display panel

200: counter substrate

210: support plate

211: Flat

212: Touch surface

220: Touch sensing pad

230: Light sensing layer

241: first conductive layer

242: second conductive layer

251: first insulating layer

252: Second insulating layer

I21: Photocurrent

LH3: ambient light

Claims (11)

A counter substrate of a display panel, comprising: a support board with a plane; a plurality of touch sensing pads formed on the plane of the support board, and the touch sensing pads are all transparent; A first conductive layer formed on the plane of the support plate and electrically connected to the touch sensing pads; at least one light-sensing layer formed on the plane of the support plate; and at least a second The conductive layer is electrically connected to the at least one light sensing layer. The counter substrate of claim 1, further comprising: a first insulating layer formed on the plane of the support plate and covering the touch sensing pads and the at least one light sensing layer; And a second insulating layer formed on the plane of the support plate and covering the first insulating layer, wherein the at least one second conductive layer is disposed on the second insulating layer and sequentially passes through the second The insulating layer and the first insulating layer are electrically connected to the at least one light sensing layer. The counter substrate of claim 2, wherein a part of each first conductive layer is formed between the first insulating layer and the second insulating layer. The counter substrate of claim 1, further comprising: a plurality of conductive pads electrically connected to the first conductive layers, wherein the plane has a display area and a non-display area around the display area, The conductive pads are arranged in the non-display area. The counter substrate of claim 1, wherein the first conductive layers and the touch sensing pads are made of transparent conductive layers. The counter substrate of claim 1, wherein when the touch sensing pads are not touch-sensed, the at least one second conductive layer supplies a bias voltage to the at least one light-sensing layer; when When the touch sensing pads perform touch sensing, the at least one second conductive layer stops supplying the bias voltage to the at least one light sensing layer. The counter substrate according to claim 1, wherein each of the at least one light sensing layer is located between the adjacent at least one second conductive layer and the touch sensing pad. A display panel includes: a pair of facing substrates, including: a support plate having a plane, wherein the plane has a display area and a non-display area around the display area; a plurality of touch sensing pads are formed in The plane of the support board, and the touch sensing pads are all transparent; a plurality of first conductive layers are formed on the plane of the support board, and are electrically connected to the touch sensing pads, respectively; At least one light-sensing layer is formed on the plane of the support plate; at least one second conductive layer is respectively electrically connected to the at least one light-sensing layer; a plurality of conductive pads are electrically connected to the first conductive layers, And disposed in the non-display area; and a control substrate, connected to the opposite substrate, and electrically connected to the opposite substrate through the conductive pads. The display panel according to claim 8, wherein the counter substrate further includes: A first insulating layer formed on the plane of the support plate and covering the touch sensing pads and the at least one light sensing layer; and a second insulating layer formed on the plane of the support plate And cover the first insulating layer, wherein the at least one second conductive layer is disposed on the second insulating layer, and sequentially passes through the second insulating layer and the first insulating layer to electrically connect the at least one light sensor Measured layer. The display panel according to claim 9, wherein a part of each first conductive layer is formed between the first insulating layer and the second insulating layer. The display panel according to claim 8, wherein the control substrate further includes a plurality of conductive bumps, wherein the conductive bumps are electrically connected to the conductive pads, respectively.

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