Detection method of display panel and light sensor in display panel

Abstract

This invention discloses a display panel and a method for detecting a light sensor in the display panel. The display panel includes a light sensor, pixel electrodes, and a detection electrode. The detection electrode is disposed on the same layer as the pixel electrodes and is insulated from them. The electrodes of the light sensor are electrically connected to the detection electrode through vias. A preset voltage is applied to the detection electrode to determine whether the light sensor is functioning properly. This method allows for the functional testing of the light sensor using existing array test equipment, effectively improving the yield of display panels with integrated light sensors.

Description

Technical Field

[0001] This invention relates to the field of display panels, and particularly to a display panel and a method for detecting light sensors in the display panel. Background Technology

[0002] One research direction in full-screen technology is how to integrate fingerprint recognition, camera, facial recognition, proximity sensor, and light sensor of the display terminal into the display area of ​​the display panel, so that the display panel gradually transitions from a simple display interface to a comprehensive perception and interaction interface.

[0003] Optical sensors are used to detect light to enable user interaction. Existing technologies can detect the light from a laser pointer to enable remote laser pointer interaction or laser pointer handwriting, and can also recognize the weakening of light when handwriting is applied to enable touch control.

[0004] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a display panel in the prior art. The display panel 100 includes a light sensor, a data line 3, a scan line 4, pixel electrodes, a common electrode line 5, a first power supply voltage line 1, and a second power supply voltage line 2. The light sensor includes a first transistor 12 and a second transistor 13. Currently, the light sensor cannot perform detection in the array segment until the module is completed, which wastes the corresponding CF, cell, and module production capacity and cannot effectively control the yield.

[0005] In view of this, it is necessary to develop a new detection method for display panels and light sensors to solve the technical problem of wasted production capacity caused by the inability of light sensors to perform detection in the array segment in the existing technology. Summary of the Invention

[0006] Embodiments of the present invention provide a display panel and a method for detecting a light sensor in the display panel, to solve the technical problem in the prior art where the light sensor cannot be detected in the array segment, resulting in wasted production capacity. To solve the above technical problem, embodiments of the present invention disclose a display panel comprising: a light sensor; a pixel electrode, insulated from the light sensor; and a detection electrode, on the same layer as the pixel electrode and insulated from it, wherein the electrode of the light sensor is electrically connected to the detection electrode through a via.

[0007] Furthermore, the display panel includes a display signal line, a read signal line, a first power supply voltage line, and a second power supply voltage line; the light sensor includes a first transistor and a second transistor, both of which include a gate, a source, and a drain. The gate of the second transistor is connected to the display signal line, the source of the second transistor is connected to the read signal line, the drain of the second transistor is connected to the source of the first transistor, the gate of the first transistor is connected to the second power supply voltage line, and the drain of the first transistor is connected to the first power supply voltage line.

[0008] Furthermore, the connection line between the drain of the second transistor and the source of the first transistor is at least partially overlapped with the detection electrode, and the detection electrode is electrically connected to the connection line through a via.

[0009] Furthermore, the display panel includes a data line, the read signal line is disposed on the same layer as the data line, the read signal line is disposed at least partially overlapping the detection electrode, and the detection electrode is electrically connected to the read signal line through a via.

[0010] Furthermore, the display panel includes a data line, the read signal line is disposed on the same layer as the data line, the read signal line is disposed at least partially overlapping with the detection electrode, the detection electrode is electrically connected to the read signal line through a via, and the connection line between the drain of the second transistor and the source of the first transistor is disposed at least partially overlapping with the detection electrode, the detection electrode is electrically connected to the connection line through a via.

[0011] Furthermore, the read signal line is disposed between the first power supply voltage line and the first transistor. The display panel includes a data line and a first connection electrode. The first connection electrode is disposed on the same layer as the pixel electrode. The first power supply voltage line is disposed on the same layer as the data line. The first power supply voltage line is electrically connected to the first connection electrode through a via. The drain of the first transistor is electrically connected to the first connection electrode through a via.

[0012] Furthermore, the display panel includes scan lines, data lines, a second connection electrode, and a third connection electrode. The second power supply voltage line is disposed on the same layer as the data line, the second connection electrode is disposed on the same layer as the pixel electrode, and the third connection electrode is disposed on the same layer as the scan lines. The second power supply voltage line is electrically connected to the second connection electrode through a via, and the second connection electrode is electrically connected to the third connection electrode through a via. The third connection electrode is multiplexed as the gate of the first transistor.

[0013] Furthermore, the optical sensor also includes: a first capacitor (C1), the first end of which is electrically connected to the drain and source of the second transistor; and a second capacitor (C2), the first end of which is electrically connected to the source of the second transistor, and the second end of which is grounded.

[0014] Furthermore, the first transistor is a photosensitive transistor, and the second transistor is a switching transistor.

[0015] To address the aforementioned technical problems, embodiments of the present invention also disclose a detection method for a light sensor in a display panel, used to detect whether the light sensor functions normally. The method includes the following steps: applying a preset voltage to the detection electrode; if the potential of the detection electrode is the same as the potential of the pixel electrode, then the light sensor functions normally.

[0016] The advantages of this invention are: by electrically connecting the electrodes of the optical sensor to the detection electrode through a via and applying a preset voltage to the detection electrode, it is possible to determine whether the optical sensor is functioning properly. This allows for the functional testing of the optical sensor using existing array test equipment, effectively improving the yield of display panels with integrated optical sensors. Attached Figure Description

[0017] The technical solution and other beneficial effects of the present invention will become apparent from the following detailed description of specific embodiments of the invention, in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of a display panel in the prior art;

[0019] Figure 2 This is a schematic diagram of the display panel structure according to Embodiment 1 of the present invention;

[0020] Figure 3 This is a circuit diagram of the display panel of the present invention;

[0021] Figure 4 This is a flowchart of the detection method of the light sensor of the display panel of the present invention;

[0022] Figure 5 This is a schematic diagram of the display panel structure according to Embodiment 2 of the present invention;

[0023] Figure 6 This is a schematic diagram of the display panel structure according to Embodiment 3 of the present invention.

[0024] Figure label:

[0025] 100. Display panel;

[0026] 1. First power supply voltage line; 2. Second power supply voltage line;

[0027] 3. Data cable; 4. Scan line;

[0028] 5. Common electrode line; 6. Detection electrode;

[0029] 7. Display signal line; 8. Read signal line;

[0030] 9. First connecting electrode; 10. Second connecting electrode;

[0031] 11. Third connecting electrode; 12. First transistor;

[0032] 13. Second transistor. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] Example 1

[0036] like Figure 2 As shown, Figure 2This is a schematic diagram of the structure of the display panel 100 provided in an embodiment of this application. The display panel 100 provided in this embodiment of the invention can be a product or component with display function, such as a mobile phone, tablet computer, laptop computer, digital camera, or navigator. The display panel 100 includes a light sensor, a pixel electrode (not shown), a first power supply voltage line 1, a second power supply voltage line 2, a data line 3, a scan line 4, a common electrode line 5, a detection electrode 6, a display signal line 7, a read signal line 8, a first connection electrode 9, a second connection electrode 10, and a third connection electrode 11.

[0037] The pixel electrodes are insulated from the light sensor. The light sensor is configured to perform optical signal acquisition operations.

[0038] The detection electrode 6 is disposed on the same layer as the pixel electrode and is insulated from it. The electrode of the light sensor is electrically connected to the detection electrode 6 through a via.

[0039] like Figure 2 As shown, multiple data lines 3 are arranged parallel to each other and spaced apart. A read signal line 8 is parallel to and on the same layer as the data lines 3. The first power supply voltage line 1 is parallel to and on the same layer as the data lines 3, and the second power supply voltage line 2 is parallel to and on the same layer as the data lines 3. The read signal line 8 is positioned between the first power supply voltage line 1 and the first transistor 12. The optical sensor is integrated between the first power supply voltage line 1 and the data lines 3 using semiconductor technology.

[0040] like Figure 2 As shown, the first connecting electrode 9 is disposed in the same layer as the pixel electrode, and the second connecting electrode 10 is disposed in the same layer as the pixel electrode.

[0041] like Figure 2 As shown, multiple scan lines 4 are arranged parallel to each other and spaced apart. The scan lines 4 intersect with the data lines 3. In this embodiment, the scan lines 4 and the data lines 3 are perpendicular to each other. The light sensor is located in the region formed by the perpendicular intersection of the scan lines 4 and the data lines 3. The third connecting electrode 11 is arranged in the same layer as the scan lines 4.

[0042] like Figure 2 As shown, the light sensor includes a first transistor 12 and a second transistor 13. Both the first transistor 12 and the second transistor 13 include a gate, a source, and a drain. In this embodiment, the first transistor 12 is a photosensitive transistor, and the second transistor 13 is a switching transistor.

[0043] In this configuration, the gate of the second transistor 13 is connected to the display signal line 7, the source of the second transistor 13 is connected to the read signal line 8, the drain of the second transistor 13 is connected to the source of the first transistor 12, the gate of the first transistor 12 is connected to the second power supply voltage line 2, and the drain of the first transistor 12 is connected to the first power supply voltage line 1.

[0044] like Figure 3 As shown, the optical sensor also includes a first capacitor (C1) and a second capacitor (C2). The first terminal of the first capacitor (C1) is electrically connected to the drain of the second transistor (T2) and the source of the first transistor (T1). The first terminal of the second capacitor (C2) is electrically connected to the source of the second transistor (T2), and the second terminal of the second capacitor (C2) is grounded.

[0045] like Figure 2 As shown, in this embodiment, the read signal line 8 and the detection electrode 6 are at least partially overlapped. The detection electrode 6 is electrically connected to the read signal line 8 through a via. Furthermore, the connection line between the drain of the second transistor 13 and the source of the first transistor 12 is at least partially overlapped with the detection electrode 6, and the detection electrode 6 is electrically connected to the connection line through a via. This allows the electrodes of the light sensor to be electrically connected to the detection electrode 6 through vias, and a preset voltage to be applied to the detection electrode 6. This enables the determination of whether the light sensor is functioning correctly, allowing for functional testing of the light sensor using existing arraytest equipment, effectively improving the yield of the display panel 100 with integrated light sensor.

[0046] like Figure 2 As shown, the first power supply voltage line 1 is electrically connected to the first connection electrode 9 through a via, and the drain of the first transistor 12 is electrically connected to the first connection electrode 9 through a via.

[0047] like Figure 2 As shown, the second power supply voltage line 2 is electrically connected to the second connection electrode 10 through a via, and the second connection electrode 10 is electrically connected to the third connection electrode 11 through a via. The third connection electrode 11 is multiplexed as the gate of the first transistor 12.

[0048] like Figure 4 As shown, this embodiment also discloses a detection method for a light sensor in a display panel described in this embodiment, used to detect whether the light sensor is functioning normally, which includes the following steps: S1, applying a preset voltage to the detection electrode; S2, if the potential of the detection electrode is the same as the potential of the pixel electrode, then the light sensor is functioning normally.

[0049] In this embodiment, the detection electrode 6 is electrically connected to the read signal line 8 through a via. The detection electrode 6 is also electrically connected to the connection line between the drain of the second transistor 13 and the source of the first transistor 12 through a via. This achieves the effect of connecting the electrodes of the optical sensor to the detection electrode through vias. By applying a preset voltage to the detection electrode, it is possible to determine whether the optical sensor is functioning properly. This allows for the functional testing of the optical sensor using existing array test equipment, effectively improving the yield of display panels with integrated optical sensors.

[0050] Example 2

[0051] like Figure 5 As shown, this embodiment includes most of the technical features of embodiment 1. The difference between this embodiment and embodiment 1 is that in this embodiment, only the connection line between the drain of the second transistor 13 and the source of the first transistor 12 is at least partially overlapped with the detection electrode 6, and the detection electrode 6 is electrically connected to the connection line through a via.

[0052] In this embodiment, the detection electrode 6 is electrically connected to the connection line between the drain of the second transistor 13 and the source of the first transistor 12 through a via, thereby achieving the effect of connecting the electrode of the optical sensor to the detection electrode through the via. By applying a preset voltage to the detection electrode, it is possible to determine whether the optical sensor is functioning properly. This allows for the functional testing of the optical sensor using existing arraytest equipment, effectively improving the yield of display panels with integrated optical sensors.

[0053] Example 3

[0054] like Figure 6 As shown, this embodiment includes most of the technical features of embodiment 1. The difference between this embodiment and embodiment 1 is that in this embodiment, the read signal line 8 and the detection electrode 6 are at least partially overlapped, and the detection electrode 6 is electrically connected to the read signal line 8 through a via.

[0055] In this embodiment, the detection electrode 6 is electrically connected to the read signal line 8 through a via, thereby achieving the effect of connecting the electrodes of the optical sensor to the detection electrode through a via. A preset voltage is applied to the detection electrode to determine whether the optical sensor is functioning properly. This allows for the functional testing of the optical sensor using existing array test equipment, effectively improving the yield of display panels with integrated optical sensors.

[0056] The foregoing has provided a detailed description of a display panel and a detection method for a light sensor in the display panel provided by the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, include: A light sensor; The pixel electrode is insulated from the light sensor; as well as The detection electrode is disposed on the same layer as the pixel electrode and is insulated therefrom. The electrode of the light sensor is electrically connected to the detection electrode through a via. The display panel includes display signal lines, read signal lines, a first power supply voltage line, and a second power supply voltage line; The optical sensor includes a first transistor and a second transistor. Both the first transistor and the second transistor include a gate, a source, and a drain. The gate of the second transistor is connected to the display signal line, the source of the second transistor is connected to the read signal line, the drain of the second transistor is connected to the source of the first transistor, the gate of the first transistor is connected to the second power supply voltage line, and the drain of the first transistor is connected to the first power supply voltage line. The optical sensor also includes: A first capacitor, the first terminal of which is electrically connected to the drain of the second transistor and the source of the first transistor; The second capacitor has its first terminal electrically connected to the source of the second transistor, and its second terminal grounded.

2. The display panel as described in claim 1, characterized in that, The connection line between the drain of the second transistor and the source of the first transistor is disposed at least partially overlapping with the detection electrode, and the detection electrode is electrically connected to the connection line through a via.

3. The display panel as described in claim 1, characterized in that, The display panel includes a data line, the read signal line is disposed on the same layer as the data line, the read signal line is disposed at least partially overlapping the detection electrode, and the detection electrode is electrically connected to the read signal line through a via.

4. The display panel as described in claim 1, characterized in that, The display panel includes a data line, the read signal line is disposed on the same layer as the data line, the read signal line is disposed at least partially overlapping the detection electrode, the detection electrode is electrically connected to the read signal line through a via, and the connection line between the drain of the second transistor and the source of the first transistor is disposed at least partially overlapping the detection electrode, the detection electrode is electrically connected to the connection line through a via.

5. The display panel as described in claim 1, characterized in that, The read signal line is disposed between the first power supply voltage line and the first transistor. The display panel includes a data line and a first connection electrode. The first connection electrode is disposed on the same layer as the pixel electrode. The first power supply voltage line is disposed on the same layer as the data line. The first power supply voltage line is electrically connected to the first connection electrode through a via. The drain of the first transistor is electrically connected to the first connection electrode through a via.

6. The display panel as described in claim 1, characterized in that, The display panel includes scan lines, data lines, a second connection electrode, and a third connection electrode. The second power supply voltage line is disposed on the same layer as the data line, the second connection electrode is disposed on the same layer as the pixel electrode, and the third connection electrode is disposed on the same layer as the scan lines. The second power supply voltage line is electrically connected to the second connection electrode through a via, and the second connection electrode is electrically connected to the third connection electrode through a via. The third connection electrode is multiplexed as the gate of the first transistor.

7. The display panel as described in claim 1, characterized in that, The first transistor is a photosensitive transistor, and the second transistor is a switching transistor.

8. A method for detecting a light sensor in a display panel as described in any one of claims 1-7, used to detect whether the light sensor is functioning properly, characterized in that, Includes the following steps: A preset voltage is applied to the detection electrode; If the potential of the detection electrode is the same as the potential of the pixel electrode, then the optical sensor is functioning normally.

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