Display brightness control method, display panel and display device

Abstract

The invention discloses a display brightness control method, a display panel and a display device. The display brightness control method comprises the steps that the working state of pixels in the display panel is recognized; detecting ambient light of an area where the pixels are located; when the working state of the pixel and the ambient light of the area where the pixel is located meet a preset condition, controlling free charges in a semiconductor layer in an optical sensor in the area where the pixel is located to move towards a preset direction; and controlling the luminance of the display area according to the magnitude of the light current in the light sensor. Through the above design, the free charges in the semiconductor layer can move towards an ideal position under the illumination condition, and the effect of increasing or reducing the light current is achieved, so that the detection result of the light sensor is prevented from being adversely affected by ambient light, and the detection precision of the light sensor is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display brightness control method, a display panel, and a display device. Background Technology

[0002] With the rapid development of electronic technology, electronic display devices such as smartphones and tablets have become increasingly popular. These electronic display devices usually have an ambient light sensor installed under the screen. The ambient light sensor is used to detect the brightness of the external ambient light. The electronic display device can control the brightness of the screen according to the detected ambient light brightness so that the brightness of the screen is adapted to the external environment.

[0003] However, current displays cannot accurately dim the area where each pixel is located, failing to meet users' increasingly demanding needs. Summary of the Invention

[0004] The purpose of this application is to provide a display brightness control method, display panel, and display device capable of precisely dimming the area where each pixel is located.

[0005] This application discloses a display brightness control method, which is used to control the luminous brightness of a display panel. The display brightness control method includes the following steps: Identify the working status of pixels in the display panel; Detect the ambient light in the area where the pixel is located; When the working state of the pixel and the ambient light in the area where the pixel is located meet preset conditions, the free charges in the semiconductor layer of the light sensor in the area where the pixel is located are controlled to move in a preset direction; and The brightness of the display area is controlled based on the magnitude of the photocurrent in the optical sensor.

[0006] Optionally, the preset conditions include a first condition: when the working state of the pixel and the ambient light in the area where the pixel is located meet the first condition, the free charge in the semiconductor layer of the photosensor in the area where the pixel is located is controlled to move towards the area where the drain electrode in the photosensor is located; wherein, the first condition is that the pixel is in a working state and the ambient light intensity in the area where the pixel is located reaches a first preset value.

[0007] Optionally, the preset condition includes a second condition: when the working state of the pixel and the ambient light in the area where the pixel is located meet the second condition, the free charge in the semiconductor layer of the photosensor in the area where the pixel is located is controlled to move away from the area where the drain electrode in the photosensor is located; wherein, the second condition is that the pixel is in a non-working state and the ambient light intensity in the area where the pixel is located reaches a first preset value.

[0008] Optionally, each frame of the display panel includes a display time period, a touch time period, and a blank time period; when the working state of the pixel and the ambient light in the area where the pixel is located meet the preset conditions, the step of controlling the free charge in the semiconductor layer of the light sensor in the area where the pixel is located to move in a preset direction is set in the blank time period.

[0009] This application also discloses a display panel that employs the display brightness control method described above. The display panel includes multiple display areas, each including at least one pixel and at least one light sensor. The light sensor includes a substrate, a source electrode, a drain electrode, and a semiconductor layer. The source electrode and the drain electrode are both disposed on the substrate and are arranged side by side. The semiconductor layer is disposed on the substrate and stacked with the source electrode and the drain electrode. The display panel further includes a charge control component for controlling the movement of free charges within the semiconductor layer in a preset direction.

[0010] Optionally, the charge control component includes a guide layer and a control chip. The guide layer is stacked with the semiconductor layer, and the guide layer and the source electrode are respectively disposed on opposite sides of the semiconductor layer. The orthographic projection of the guide layer on the substrate covers the orthographic projection of the source electrode on the substrate. The control chip is electrically connected to the guide layer and provides an electrical signal to the guide layer to control the free charge in the semiconductor layer to move in a preset direction.

[0011] Optionally, the source and the drain are both disposed on the side of the semiconductor layer facing the substrate, and the guiding layer is disposed on the side of the semiconductor layer away from the substrate.

[0012] Optionally, the semiconductor layer includes a receiving trench disposed on the side of the semiconductor layer facing the guiding layer, and the guiding layer is disposed in the receiving trench.

[0013] Optionally, the material of the semiconductor layer includes amorphous silicon, indium gallium zinc oxide, low-temperature polycrystalline silicon, or low-temperature polycrystalline oxide.

[0014] This application also discloses a display device, which includes a driving circuit and a display panel as described above. The driving circuit is connected to the display panel and is used to drive the display panel.

[0015] The beneficial effects of this application embodiment are as follows: This application embodiment controls the free charge in the semiconductor layer of the photosensor in the pixel area according to the working state of the pixel and the ambient light in the pixel area. Under illumination, the free charge can move to the ideal position, thereby increasing or decreasing the photocurrent. This prevents the detection result of the photosensor from being adversely affected by the ambient light and improves the detection accuracy of the photosensor. Moreover, each pixel area has a corresponding photosensor, which enables precise dimming of each pixel area. Attached Figure Description

[0016] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a flowchart of a display brightness control method provided in the first embodiment of this application; Figure 2 This is a timing diagram of a display panel provided in the first embodiment of this application; Figure 3 This is a timing diagram of another display panel provided in the first embodiment of this application; Figure 4 This is a cross-sectional schematic diagram of a display panel provided in the second embodiment of this application; Figure 5 This is a plan view of a display panel provided in the second embodiment of this application; Figure 6 This is a schematic diagram of the movement path of electrons inside a semiconductor layer provided in the second embodiment of this application; Figure 7 This is a schematic diagram of another electron movement path inside a semiconductor layer provided in the second embodiment of this application; Figure 8 This is a schematic diagram of another electron movement path inside a semiconductor layer provided in the second embodiment of this application; Figure 9 This is a cross-sectional schematic diagram of another display panel provided in the second embodiment of this application; Figure 10This is a cross-sectional schematic diagram of another display panel provided in the second embodiment of this application; Figure 11 This is a schematic diagram of a display device provided in the third embodiment of this application.

[0017] Among them, 10 is a display device; 20 is a driving circuit; 30 is a display panel; 100 is a light sensor; 110 is a substrate; 111 is a gate; 112 is a gate insulating layer; 120 is a source; 130 is a drain; 140 is a semiconductor layer; 141 is a receiving trench; 150 is a charge control component; 160 is a guide layer; and 170 is a control chip. Detailed Implementation

[0018] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0019] Furthermore, unless otherwise explicitly specified and limited, "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0021] In the dimming design of the display panel, the light sensor in the display panel needs to expose the photosensitive layer to ambient light. When the ambient light shines on the photosensitive layer, a photocurrent is generated. The signal line detects the photocurrent generated by the photosensitive layer and transmits it to the driver chip. The chip provides a corresponding preset pixel driving voltage based on the magnitude of the photocurrent to improve the brightness of the display panel and achieve the goal of clearly seeing the screen content even in strong light.

[0022] However, current display panel dimming designs can only dim the brightness of all pixels simultaneously. When ambient light shines on part of the screen, or when the intensity of ambient light varies across different areas of the screen, the display panel cannot dim individual pixels or a subset of pixels. Whenever strong light shines on the area where the light sensor is located, the brightness of all pixels on the display panel is increased, or the overall backlight brightness is raised. This cannot meet the needs of use in complex environments. Specifically, firstly, because the brightness of all pixels increases synchronously, it increases the power consumption of the display product; secondly, pixels that do not need increased brightness are also brightened, resulting in a worse overall brightness perception for the human eye; thirdly, if strong light only shines on areas without light sensors (for example, some display panels only have light sensors in non-display areas, while strong light only shines on the display area), then light sensing and dimming functions cannot be achieved.

[0023] Based on this, embodiments of this application provide a display brightness control method, a display panel, and a display device, which solve the above problems by precisely dimming the area where each pixel is located.

[0024] like Figure 1 As shown, the first embodiment of this application provides a display brightness control method, which is used to control the luminous brightness of a display panel. The display brightness control method includes the following steps: S1: Identify the working status of pixels in the display panel; S2: Detect the ambient light in the area where the pixel is located; S3: When the working state of the pixel and the ambient light in the area where the pixel is located meet the preset conditions, control the free charge in the semiconductor layer of the light sensor in the area where the pixel is located to move in the preset direction; S4: Control the brightness of the display area according to the magnitude of the photocurrent in the light sensor.

[0025] According to the embodiments of this application, the free charges in the semiconductor layer of the photosensor in the pixel area are controlled based on the working state of the pixel and the ambient light in the pixel area. Under illumination, the free charges in the semiconductor layer can move to an ideal position, thereby increasing or decreasing the photocurrent. This prevents the detection results of the photosensor from being adversely affected by ambient light and improves the detection accuracy of the photosensor. Moreover, each pixel area has a corresponding photosensor, which enables precise dimming of the area where each pixel is located.

[0026] It should be noted that the optical sensor in this embodiment employs a thin-film transistor (TFT) structure. Generally, when the semiconductor layer in the optical sensor is illuminated by ambient light, photogenerated carriers are generated. These photogenerated carriers enter the channel region of the TFT, causing the channel to conduct and achieving the conversion of optical signals to electrical signals. Normally, when the source of a TFT is energized, all the charges in the semiconductor layer move directionally to form a current flowing to the drain. However, in the optical sensor, when the semiconductor layer is illuminated, the charges generated by the illumination do not all move in the same direction. This means that only a portion of the charges participate in the formation of the photocurrent, while the remaining charges do not participate in the current operation, resulting in inaccurate ambient light detection. In this embodiment, "ionized charges within the semiconductor layer" refers to charges that did not originally participate in the current operation.

[0027] In some embodiments, the region where a pixel is located may refer to a single pixel region or a region composed of multiple adjacent pixels.

[0028] In some embodiments, the preset condition includes a first condition: when the working state of the pixel and the ambient light in the area where the pixel is located meet the first condition, the free charge in the semiconductor layer of the photosensor in the area where the pixel is located is controlled to move towards the area where the drain electrode of the photosensor is located; wherein, the first condition is that the pixel is in a working state and the ambient light intensity in the area where the pixel is located reaches a first preset value.

[0029] The first condition can be understood as the pixel emitting its own light, being illuminated, and the illumination reaching a certain level. Under this condition, because some charges in the semiconductor layer do not participate in the current operation, the photocurrent decreases. The ambient light intensity determined by the driver chip is lower than the external ambient light intensity, resulting in a weaker brightness adjustment of the display panel, failing to reach the ideal state and not meeting the user's needs. Therefore, this embodiment controls the free charges in the semiconductor layer to move towards the drain area of ​​the light sensor, allowing most or all of the charges generated by ambient light to participate in the current operation, thus increasing the photocurrent. This makes the ambient light intensity determined by the driver chip closer to the external ambient light intensity, thereby increasing the brightness of the display panel and reaching the ideal state.

[0030] In some embodiments, the preset condition includes a second condition: when the working state of the pixel and the ambient light in the area where the pixel is located meet the second condition, the free charge in the semiconductor layer of the photosensor in the area where the pixel is located is controlled to move away from the area where the drain electrode in the photosensor is located; wherein, the second condition is that the pixel is in a non-working state and the ambient light intensity in the area where the pixel is located reaches a first preset value.

[0031] The second condition can be understood as the pixel not emitting light, but being illuminated, and the illumination reaching a certain level. Under this condition, leakage current occurs in the semiconductor layer of the photosensor due to illumination. In other words, ideally, electrons should not flow when the pixel is not powered, but strong ambient light provides energy to the electrons in the semiconductor layer. The source receiving electrons causes the driver chip to power the pixel, causing a pixel that is not normally active to become active. To avoid this problem, this embodiment controls the free charges within the semiconductor layer to move away from the drain in the photosensor, preventing these charges from participating in the current operation, thereby avoiding the problem of pixels that are not normally active being turned on due to leakage current.

[0032] In some embodiments, the first preset value is a light intensity of not less than 300 lux, that is, the area where the pixel is located is under normal ambient light or strong light.

[0033] like Figure 2 As shown, in some embodiments, the display panel can be a touch panel. Each frame of the display panel includes a display time period and a touch time period. There is a gap between two adjacent frames. The light sensing detection time period of step S3 is located within the gap, thereby accurately detecting ambient light between every two adjacent frames without affecting the timing of display and touch. Steps S1 and S2 can also be performed within the gap, where ambient light detection, pixel state recognition, and detection adjustment can be performed simultaneously. Of course, in other embodiments, steps S1 and S2 can be performed in other time periods.

[0034] like Figure 3 As shown, in some embodiments, each frame of the display panel includes a display time period, a touch time period, and a blank time period. Specifically, the touch time can be reduced by designing the calculation module so that a blank time period is left in each frame. In this embodiment, step S3 is implemented within the blank time period to add a light-sensing detection time period after each frame's touch time period. Based on the magnitude of the feedback current value, the source drive voltage output by the source drive chip is increased when the next frame starts to be output.

[0035] Of course, in other embodiments, the time of each frame of the display panel may not include the touch time period, and the light sensing time period of step S3 may be located in the gap area between two adjacent frames or in the blank time period after the display time period for each frame.

[0036] like Figure 4 and Figure 5As shown, the second embodiment of this application provides a display panel 30. The display panel 30 employs the display brightness control method described above. The display panel 30 includes multiple display areas, each display area including at least one pixel and at least one light sensor 100. The light sensor 100 includes a substrate 110, a source 120, a drain 130, and a semiconductor layer 140. The source 120 and the drain 130 are both disposed on the substrate 110, and the source 120 and the drain 130 are arranged side by side. The semiconductor layer 140 is disposed on the substrate 110 and stacked with the source 120 and the drain 130. The display panel 30 also includes a charge control component 150, which is used to control the movement of free charges in the semiconductor layer 140 in a preset direction.

[0037] In the embodiments of this application, the display area may refer to a single pixel area or an area containing multiple pixels, and is not limited thereto.

[0038] In this embodiment, the optical sensor 100 adopts a thin-film transistor structure. In addition to the substrate 110, source 120, drain 130 and semiconductor layer 140 mentioned above, it also includes a gate 111 and a gate insulating layer 112. The gate 111 is disposed on the substrate 110, the gate insulating layer 112 is disposed on the gate 111, and the source 120, drain 130 and semiconductor layer 140 are disposed on the gate insulating layer 112.

[0039] In this embodiment, the material of the semiconductor layer 140 includes amorphous silicon, indium gallium zinc oxide, low-temperature polycrystalline silicon, or low-temperature polycrystalline oxide. Any material capable of generating photocurrent under ambient light irradiation can meet the requirements of the semiconductor layer 140 in this embodiment.

[0040] It should be noted that the top of the semiconductor layer 140 in the optical sensor 100 is not blocked by the light-shielding structure, so that ambient light can shine on the semiconductor layer 140 to realize the function of photoelectric generation.

[0041] In this embodiment, the charge control component 150 moves the free charges within the semiconductor layer 140 of the light sensor 100 in a preset direction to control the magnitude of the photocurrent in the semiconductor layer 140. This prevents the detection results of the light sensor 100 from being adversely affected by ambient light, thereby improving the detection performance of the light sensor 100. When ambient light is present, the display panel 30 can perform individual optimization based on the light intensity received by each pixel area. While ensuring high-quality display, this can save more power consumption and avoid the problem of dimming functionality being lost because ambient light does not reach the light sensor 100 outside the display area.

[0042] like Figure 5 As shown, in some embodiments, the charge control component 150 includes a guide layer 160 and a control chip 170. The guide layer 160 is stacked with the semiconductor layer 140, and the guide layer 160 and the source electrode 120 are respectively disposed on opposite sides of the semiconductor layer 140. The orthographic projection of the guide layer 160 on the substrate 110 covers the orthographic projection of the source electrode 120 on the substrate 110, that is, the guide layer 160 covers the source electrode 120 in both width and length. Moreover, the control chip 170 is electrically connected to the guide layer 160, and the control chip 170 provides an electrical signal to the guide layer 160 to control the movement of free charges within the semiconductor layer 140 in a preset direction.

[0043] The guiding layer 160 is made of a metal material, specifically the same material as the source 120 and drain 130. When the control chip 170 provides an electrical signal to the guiding layer 160, the guiding layer 160 generates an electric field. Since the guiding layer 160 covers the source 120, the electric field covers the source 120. Under the action of the electric field, the charge in the semiconductor is controlled to move away from or closer to the source 120, thereby achieving the purpose of charge control.

[0044] When the semiconductor layer 140 is irradiated by ambient light, a photocurrent is generated. The photocurrent is transmitted to the control chip 170 through the guide layer 160. The control chip 170 provides a corresponding electrical signal to the guide layer 160 based on the photocurrent generated by the semiconductor layer 140 and the pixel working state obtained from the driving current, so that the guide layer 160 generates a responsive electric field, controlling the free charge in the semiconductor layer 140 of the light sensor 100 to move in a preset direction.

[0045] In this embodiment, a charge control component 150, consisting of a guide layer 160 and a control chip 170, is used to control the movement of charge in a semiconductor. In the manufacturing process of the display panel 30, the guide layer 160 can be completed in the manufacturing process of the light sensor 100. The control chip 170 can be integrated with the gate driving circuit on the display panel 30, or it can be mounted on the display panel 30 as a separate chip, or it can be set in the driving circuit, thereby simplifying the design of the display panel 30.

[0046] As a specific example, such as Figure 6As shown, in the first application scenario, when a pixel is under strong light (60,000-100,000 lux) and the pixel is in working state, the control chip 170 sends a low-level signal or a negative voltage signal. The electric field generated by the guide layer 160 under the action of the low-level signal repels electrons and quickly pushes the electrons to the vicinity of the source 120, making it easier for the source 120 to receive current signals affected by ambient light. At this time, the corresponding N curve is the shape after strong light irradiation. When working in the next frame, the driving circuit processes the signal detected by the ambient light and increases the driving voltage of the pixel under the preset conditions (the correspondence between the current caused by the intensity of ambient light and the brightness of the display panel 30) to achieve a high brightness effect.

[0047] In the second application scenario, such as Figure 7 As shown, when a pixel is under strong light and is not in operation, considering that strong light shining on the semiconductor layer 140 will generate leakage current, causing the driving circuit to provide driving voltage to the non-working pixel, the control chip 170 in this embodiment of the application sends a high-level signal or a positive voltage signal to attract most of the electrons to the junction of the adsorption layer and the semiconductor layer 140. At this time, only a very small number of electrons reach the source 120, which almost avoids the generation of leakage current in the semiconductor layer 140, thereby avoiding the situation where the non-working pixel is accidentally turned on due to the leakage current on the light sensor 100.

[0048] In the third application scenario, when the pixel is exposed to ambient light (300-500 lux) and is in working condition, the control chip 170 emits a low-level signal or a negative voltage signal. The electric field generated by the guide layer 160 under the influence of the low-level signal repels electrons, quickly displacing them near the source electrode 120. In the fourth application scenario, when the pixel is exposed to ambient light and is not in working condition, the control chip 170 emits a high-level signal or a positive voltage signal, attracting most electrons to the interface between the adsorption layer and the semiconductor layer 140.

[0049] It should be noted that the electrical signal emitted by the control chip 170 is not fixed. From the second application scenario to the fourth application scenario, due to the decrease in light intensity, the activity of electrons in the semiconductor layer 140 is less. Therefore, the voltage on the guide layer 160 in the fourth application scenario can be lower than the voltage on the guide layer 160 in the second application scenario to avoid increased power consumption.

[0050] In the fifth application scenario, such as Figure 8As shown, when a pixel is in a dark environment and is in working mode, the control chip 170 does not emit an electrical signal, the guide layer 160 does not generate an electric field, and the light sensor 100 switches to normal mode. In the sixth application scenario, when a pixel is in a dark environment and is not in working mode, the control chip 170 still does not emit an electrical signal, the guide layer 160 does not generate an electric field, and the light sensor 100 switches to normal mode.

[0051] Under normal conditions, the drain 130 provides electrons and the source 120 receives electrons. However, since the guide layer 160 is in contact with the semiconductor layer 140, the guide layer 160 will turn on a voltage during the detection period and absorb electrons, causing a portion of the voltage that the source 120 needs to obtain to be diverted. To avoid this situation, in some embodiments, when the drain 130 provides a positive voltage, the guide layer 160 controls the chip 170 to provide a positive voltage in order not to attract electrons; when the drain 130 provides a negative voltage, the guide layer 160 controls the chip 170 to provide a negative voltage in order not to attract holes.

[0052] In some embodiments, such as Figure 4 As shown, the source 120 and the drain 130 are both disposed on the side of the semiconductor layer 140 facing the substrate 110, and the guide layer 160 is disposed on the side of the semiconductor layer 140 away from the substrate 110. Because the guide layer 160 is disposed on the side of the semiconductor closer to the light-emitting surface of the display panel 30, it receives better illumination, resulting in more active electrons in the semiconductor layer 140. When the guide layer 160 generates an electric field, the electric field has a better effect on the electrons in the semiconductor layer 140.

[0053] In other embodiments, such as Figure 9 As shown, the source 120 and the drain 130 can both be disposed on the side of the semiconductor layer 140 away from the substrate 110, while the guide layer 160 is disposed on the side of the semiconductor layer 140 facing the substrate 110.

[0054] As a further implementation method, such as Figure 10 As shown, the semiconductor layer 140 includes a receiving groove 141, which is disposed on the side of the semiconductor layer 140 facing the guiding layer 160, and the guiding layer 160 is disposed in the receiving groove 141. With this design, the bottom and sides of the guiding layer 160 are in close contact with the semiconductor layer 140, which not only reduces the distance between the guiding layer 160 and the source electrode 120, but also increases the range and effect of the electric field of the guiding layer 160, making it easier for electrons in the semiconductor layer 140 to move away from or towards the source electrode 120.

[0055] This application embodiment also provides a method for manufacturing a display panel 30. Specifically, a gate metal layer is first formed on a substrate, and then the gate metal layer is etched into a gate by exposure-development-etching. Next, a gate insulating layer is formed on the gate, and then a first metal layer is formed on the gate insulating layer. After exposure-development-etching of the first metal layer, a source and a drain are formed. Then, a semiconductor layer is formed on the source and drain, and then a second metal layer is formed on the semiconductor layer. After exposure-development-etching of the second metal layer, a guide layer is formed.

[0056] like Figure 11 As shown, a display device 10 provided in the third embodiment of this application includes a driving circuit 20 and a display panel 30 as described above. The driving circuit 20 is connected to the display panel 30 and is used to drive the display panel 30. The display panel 30 may be a liquid crystal panel, an organic electro-laser display panel 30 or other types of display panels 30, which are not limited here.

[0057] It should be noted that the limitations of each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. Solutions from different embodiments can be combined and applied without conflict. As long as this solution can be implemented, they should be considered to fall within the protection scope of this application.

[0058] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A display luminance control method for controlling luminous intensity of a display panel, characterized by, The display brightness control method includes the following steps: Identify the working status of pixels in the display panel; Detect the ambient light in the area where the pixel is located; When the working state of the pixel and the ambient light in the area where the pixel is located meet the preset conditions, the free charge in the semiconductor layer of the light sensor in the area where the pixel is located is controlled to move in the preset direction; as well as The brightness of the display area is controlled based on the magnitude of the photocurrent in the optical sensor.

2. The display brightness control method as described in claim 1, characterized in that, The preset conditions include a first condition: when the working state of the pixel and the ambient light in the area where the pixel is located meet the first condition, the free charge in the semiconductor layer of the light sensor in the area where the pixel is located is controlled to move towards the area where the drain electrode of the light sensor is located. The first condition is that the pixel is in a working state and the ambient light intensity of the area where the pixel is located reaches a first preset value.

3. The display brightness control method as described in claim 1, characterized in that, The preset conditions include a second condition: when the working state of the pixel and the ambient light in the area where the pixel is located meet the second condition, the free charge in the semiconductor layer of the photosensor in the area where the pixel is located is controlled to move away from the area where the drain electrode in the photosensor is located. The second condition is that the pixel is in a non-working state and the ambient light intensity of the area where the pixel is located reaches a first preset value.

4. The display brightness control method as described in claim 1, characterized in that, Each frame of the display panel includes a display time period, a touch time period, and a blank time period. When the working state of the pixel and the ambient light in the area where the pixel is located meet the preset conditions, the step of controlling the free charge in the semiconductor layer of the light sensor in the area where the pixel is located to move in a preset direction is set in the blank time period.

5. A display panel, employing the display brightness control method as described in any one of claims 1-4, characterized in that, The display panel includes multiple display areas, each of which includes at least one pixel and at least one light sensor; The optical sensor includes: Substrate; The source electrode is disposed on the substrate; A drain electrode, disposed on the substrate, is arranged parallel to the source electrode; and A semiconductor layer is disposed on the substrate and stacked with the source and the drain. The display panel further includes a charge control component, which is used to control the movement of free charges within the semiconductor layer in a preset direction.

6. The display panel as described in claim 5, characterized in that, The charge control component includes a guide layer and a control chip. The guide layer is stacked with the semiconductor layer, and the guide layer and the source electrode are respectively disposed on opposite sides of the semiconductor layer. The orthogonal projection of the guide layer on the substrate covers the orthogonal projection of the source electrode on the substrate. The control chip is electrically connected to the guide layer, and the control chip provides an electrical signal to the guide layer to control the free charges in the semiconductor layer to move in a preset direction.

7. The display panel as described in claim 6, characterized in that, The source and the drain are both disposed on the side of the semiconductor layer facing the substrate, and the guiding layer is disposed on the side of the semiconductor layer away from the substrate.

8. The display panel as described in claim 6, characterized in that, The semiconductor layer includes a receiving trench disposed on the side of the semiconductor layer facing the guiding layer, and the guiding layer is disposed in the receiving trench.

9. The display panel as described in claim 5, characterized in that, The semiconductor layer is made of amorphous silicon, indium gallium zinc oxide, low-temperature polycrystalline silicon, or low-temperature polycrystalline oxide.

10. A display device, characterized in that, It includes a driving circuit and a display panel as described in any one of claims 5-9, wherein the driving circuit is connected to the display panel and is used to drive the display panel.

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