Display panel, brightness control method thereof and display device

Abstract

The application discloses a display panel, a brightness control method thereof and a display device. The brightness control method of the display panel comprises the following steps: receiving ambient light and storing photoelectric current converted from the ambient light to form storage electric energy; detecting the brightness of the ambient light and analyzing the brightness level of the ambient light; when the brightness level of the ambient light reaches a preset level, providing a compensation current to a light emitting unit in the display panel through the storage electric energy in a light emitting stage of the display panel. Through the above design, when the ambient light reaches a certain brightness, the originally provided voltage of the display panel does not need to be changed for brightness adjustment, but the stored current is compensated to the light emitting unit to achieve the effect of dimming. Moreover, the current compensated to the light emitting unit is not provided by a battery in the display product, but provided by the storage electric energy composed of the converted photoelectric current, so that the loss of the battery is reduced, and the service life of the battery and the display panel can be greatly increased.

Description

Technical Field

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

[0002] Organic light-emitting diode (OLED) displays are widely used in portable electronic products such as mobile phones due to their advantages of being thin and light, having fast response times, low power consumption, high contrast, and high brightness. OLED driving methods are mainly divided into two types: passive-matrix organic light-emitting diode (PMOLED) and active-matrix organic light-emitting diode (AMOLED). Passive-matrix OLED displays use vertically intersecting cathode and anode strips to form pixel light-emitting units, and pixel brightness is controlled by applying current through external circuitry. Active-matrix OLED displays, on the other hand, require each pixel light-emitting unit to be independently controlled by a driving unit. Active-matrix OLED displays only need to illuminate the pixels to be displayed, unlike passive-matrix OLED displays which require higher operating current to maintain brightness, thus resulting in lower power consumption and wider application.

[0003] To further reduce power consumption, automatic dimming technology is often incorporated into displays, adjusting the screen brightness to adapt to different ambient light levels. However, automatic dimming typically uses an IC to control the on / off time ratio of pixels to adjust brightness. In brightly lit environments, this requires consuming battery power to increase screen brightness, resulting in significant battery wear and greatly reducing battery life. Summary of the Invention

[0004] The purpose of this application is to provide a display panel and its brightness control method and display device, so as to reduce battery consumption and improve the service life of the battery and display panel.

[0005] This application discloses a brightness control method for a display panel, the brightness control method for the display panel including the following steps:

[0006] It receives ambient light and stores the photocurrent converted from the ambient light, thus forming stored electrical energy;

[0007] Detect ambient light brightness and analyze the brightness level of ambient light; and

[0008] When the ambient light brightness level reaches a preset level, during the light-emitting phase of the display panel, the stored electrical energy provides compensation current to the light-emitting units in the display panel.

[0009] Optionally, the step of detecting ambient light brightness and analyzing the ambient light brightness level includes:

[0010] Establish a digital compensation model for ambient light brightness levels and compensation current;

[0011] Detect ambient light intensity and acquire an analog signal of ambient light intensity;

[0012] The analog signal of the ambient light brightness is converted into a corresponding light intensity value; and

[0013] The brightness level corresponding to the light intensity value in the digital compensation model is analyzed.

[0014] Optionally, in the digital compensation model, the ambient light brightness level includes a first brightness level, a second brightness level, and a third brightness level. The brightness range of the first brightness level is 0 lux-100 lux, the brightness range of the second brightness level is 100 lux-1000 lux, and the brightness range of the third brightness level is 1000 lux-10000 lux. When the ambient light brightness level reaches the second brightness level, a first compensation current is provided to the light-emitting unit in the display panel through the stored electrical energy. When the ambient light brightness level reaches the third brightness level, a second compensation current is provided to the light-emitting unit in the display panel through the stored electrical energy. The second compensation current is greater than the first compensation current.

[0015] Optionally, when the ambient light brightness level reaches a preset level, in the step of providing compensation current to the light-emitting units in the display panel through the stored electrical energy during the light-emitting phase of the display panel, the stored electrical energy provides a first compensation current to the light-emitting units in the display area of ​​the display panel, and the stored electrical energy provides a second compensation current to the light-emitting units in the camera area of ​​the display panel, and the second compensation current is greater than the first compensation current.

[0016] This application also discloses a display panel that employs the brightness control method described above. The display panel includes a light sensor, an energy storage unit, a brightness analysis unit, and a brightness compensation unit. The light sensor detects the brightness of ambient light, and the energy storage unit stores current converted from ambient light to form stored electrical energy. The brightness analysis unit is connected to the light sensor and analyzes the brightness level of the ambient light. The brightness compensation unit is connected to the brightness analysis unit and the energy storage unit. When the brightness level of the ambient light reaches a preset level, during the light emission phase of the display panel, the brightness compensation unit provides compensation current to the light emission unit in the display panel through the stored electrical energy, thereby increasing the brightness of the light emission unit.

[0017] Optionally, after analyzing the brightness level of the ambient light, the brightness analysis unit outputs a corresponding first current control signal; the brightness compensation unit includes a first current control switch, which is a single-gate transistor. The input terminal of the first current control switch is connected to the energy storage unit to receive the compensation current provided by the energy storage unit. The control terminal of the first current control switch is connected to the brightness analysis unit to receive the first current control signal. The output terminal of the first current control switch is connected to the light-emitting unit; wherein, the brightness level of the ambient light includes a first brightness level, a second brightness level, and a third brightness level, and the first brightness level... The brightness range of the first brightness level is 0 lux-100 lux, the brightness range of the second brightness level is 100 lux-1000 lux, and the brightness range of the third brightness level is 1000 lux-10000 lux. When the ambient light brightness level is at the first brightness level, the voltage of the first current control signal is 0. When the ambient light brightness level is at the second brightness level, the voltage of the first current control signal is greater than 0 and less than the threshold voltage of the first current control switch. When the ambient light brightness level is at the third brightness level, the voltage of the first current control signal is greater than or equal to the threshold voltage of the first current control switch.

[0018] Optionally, the display panel includes a plurality of first pixel units, which are arranged in an array in the display area of ​​the display panel; each first pixel unit includes a first scan line, a second scan line, a data line, a reset line, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a capacitor, and a light-emitting unit; the input terminal of the first switch is connected to the reset line, and the control terminal of the first switch is connected to the first scan line; the input terminal of the second switch is connected to the data line, and the control terminal of the second switch is connected to the second scan line; the input terminal of the third switch receives a power signal, and the control terminal of the third switch receives a light-emitting control signal; the input terminal of the fourth switch is connected to the output terminal of the third switch, and the control terminal of the fourth switch... The capacitor is connected to the output terminals of the first and second switches; one end of the capacitor is connected to the input terminal of the fourth switch, and the other end of the capacitor is connected to the control terminal of the fourth switch; the input terminal of the fifth switch is connected to the output terminal of the fourth switch, the control terminal of the fifth switch receives the light emission control signal, and the output terminal of the fifth switch is connected to the light emission unit; the input terminal of the sixth switch is connected to the reset line, the control terminal of the sixth switch is connected to the second scan line, and the output terminal of the sixth switch is connected to the output terminal of the fifth switch, intersecting at the first connection point; the output terminal of the first current control switch is connected to the output terminal of the fifth switch, intersecting at the second connection point, which is located between the first connection point and the light emission unit.

[0019] Optionally, each of the first pixel units is provided with the first current control switch and the energy storage unit.

[0020] Optionally, the display panel includes a plurality of second pixel units, which are arranged in an array in the camera area of ​​the display panel; the brightness compensation unit includes a second current control switch, which is a dual-gate transistor; the input terminal of the second current control switch is connected to the energy storage unit to receive the compensation current provided by the energy storage unit; the first control terminal of the second current control switch is connected to the brightness analysis unit to receive the first current control signal; the second control terminal of the second current control switch is connected to the brightness analysis unit to receive the second current control signal, which is of a different type from the first current control signal; the output terminal of the second current control switch is connected to the light-emitting unit in the second pixel unit.

[0021] 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.

[0022] The beneficial effects of this application embodiment are as follows: By storing the photocurrent converted from ambient light, when the brightness level of the ambient light reaches a certain level (preset level), it is not necessary to change the voltage originally provided by the display panel for brightness adjustment. Instead, on the basis of the normal light emission of the light-emitting units in the display panel, the stored current is additionally used to compensate the light-emitting units, making the light-emitting units brighter than usual, thus achieving the effect of adapting to the external ambient light through brightness adjustment. Moreover, the current compensated to the light-emitting units is not provided by the battery in the display product, but by the stored electrical energy composed of the converted photocurrent, thereby reducing battery wear and significantly increasing the lifespan of the battery and the display panel. Attached Figure Description

[0023] 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:

[0024] Figure 1 This is a schematic diagram of a display panel provided in the first embodiment of this application;

[0025] Figure 2 This is a schematic diagram of a first pixel unit provided in the first embodiment of this application;

[0026] Figure 3 This is a schematic diagram illustrating the relationship between ambient light intensity and the voltage of a first current control signal, provided in the first embodiment of this application.

[0027] Figure 4 This is a schematic diagram of a second pixel unit provided in the first embodiment of this application;

[0028] Figure 5 This is a timing diagram provided in the first embodiment of this application;

[0029] Figure 6 This is a flowchart of a brightness control method for a display panel provided in the second embodiment of this application;

[0030] Figure 7 Based on Figure 5 Detailed flowchart;

[0031] Figure 8 This is a schematic diagram of a display device provided in the third embodiment of this application.

[0032] Among them, 10 is a display device; 20 is a display panel; 20A is a first pixel unit; 20B is a second pixel unit; 21 is a light sensor; 22 is an energy storage unit; 23 is a brightness analysis unit; 24 is a brightness compensation unit; 241 is a first current control switch; 242 is a second current control switch; 30 is a driving circuit; Scan1 is a first scan line; Scan2 is a second scan line; Data is a data line; Reset is a reset line; T1 is a first switch; T2 is a second switch; T3 is a third switch; T4 is a fourth switch; T5 is a fifth switch; T6 is a sixth switch; Cst is a capacitor; OLED is a light-emitting unit; C1 is a storage capacitor; and 100 is a photosensitive sensor. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0036] Figure 1 This is a display panel provided in an embodiment of this application, such as... Figure 1 As shown, the display panel 20 includes a light sensor 21, an energy storage unit 22, a brightness analysis unit 23, and a brightness compensation unit 24. The light sensor 21 is used to detect the brightness of ambient light. The energy storage unit 22 is used to store the current converted from ambient light to form stored electrical energy. The brightness analysis unit 23 is connected to the light sensor 21 and is used to analyze the brightness level of ambient light. The brightness compensation unit 24 is connected to the brightness analysis unit 23 and the energy storage unit 22. When the brightness level of the ambient light reaches a preset level, during the light emission stage of the display panel 20, the brightness compensation unit 24 provides compensation current to the light emission unit in the display panel 20 through the stored electrical energy to improve the brightness of the light emission unit.

[0037] This embodiment stores the photocurrent converted from ambient light. When the brightness level of the ambient light reaches a certain level (preset level), it is not necessary to change the voltage originally provided by the display panel 20 for brightness adjustment. Instead, on the basis of the normal light emission of the light-emitting units in the display panel 20, the stored current is additionally used to compensate the light-emitting units, making the light-emitting units brighter than usual. This achieves the effect of adapting to the external ambient light through brightness adjustment. Moreover, the current compensated to the light-emitting units is not provided by the battery in the display product, but by the stored electrical energy composed of the converted photocurrent, thereby reducing battery consumption and significantly increasing the lifespan of the battery and the display panel 20.

[0038] In some embodiments, the light sensor 21 is located in the non-display area of ​​the display panel 20. An opening is provided at the top of the light sensor 21 to allow ambient light to illuminate it for ambient light sensing. Furthermore, there can be multiple light sensors 21, distributed on different sides of the display panel 20. The light sensor 21 that detects the brightest ambient light is used as a reference, and its detection result is output to the brightness analysis unit 23, which analyzes the brightness level of the brightest ambient light. This design avoids inaccurate ambient light detection when individual light sensors 21 are blocked, thus improving detection accuracy. Of course, detection accuracy can also be improved in other ways, such as averaging the detection results of multiple light sensors 21, or placing the light sensor 21 in a position that is less likely to be blocked.

[0039] In some embodiments, the light sensor 21 can also be made within the pixel unit, which can perform local light sensing on the pixel area, and can even work with the brightness analysis unit 23 and the brightness compensation unit 24 to achieve local brightness compensation.

[0040] In some embodiments, the energy storage unit 22 includes a storage capacitor C1 and a photosensor 100. The photosensor 100 converts ambient light into photocurrent, and the storage capacitor C1 is connected to the photosensor 100 to store the photocurrent converted by the photosensor 100. The photosensor 100 and the photosensor 21 may both employ the same thin-film transistor structure and be formed using the same process as the active switching structure in the display panel 20 to improve the overall process efficiency of the display panel 20. Of course, in some other embodiments, the storage capacitor C1 can be replaced with an inductor, battery, or other structure, and the photosensor 100 can be replaced with a photodiode or other optoelectronic structure, depending on the specific circumstances.

[0041] In some embodiments, the brightness analysis unit 23 includes an analog-to-digital converter (ADC) that converts the photocurrent detected by the light sensor 21 into a digital signal to obtain a corresponding light intensity value. This light intensity value is then substituted into a pre-established digital compensation model or a pre-defined brightness range to determine the brightness level of the light intensity value and the corresponding required compensation current. The digital compensation model can be represented in tabular form, or it can be represented using a coordinate system, formulas, or other methods.

[0042] In one specific implementation, the ambient light brightness levels include a first brightness level, a second brightness level, and a third brightness level. The brightness range of the first brightness level is 0 lux-100 lux, the brightness range of the second brightness level is 100 lux-1000 lux, and the brightness range of the third brightness level is 1000 lux-10000 lux. When the ambient light brightness reaches or exceeds the second brightness level, it indicates that the ambient light is relatively bright, exceeding the light output brightness of the display panel 20, requiring brightness compensation and providing additional compensation current to the OLED light-emitting unit. The preset levels at this time are the second and third brightness levels.

[0043] The first brightness level can be further divided into a dark state level and a normal brightness level. The brightness range of the dark state level is 0-50 lux, and the brightness range of the normal brightness level is 50 lux-100 lux. At this time, the second brightness level is the sub-brightness state, and the third brightness level is the high brightness state. Brightness compensation is only performed when the ambient light reaches the sub-brightness state and the high brightness state. At the dark state level and the normal brightness level, the battery can supply power to the display panel 20 normally. At this time, the battery power consumption is small, and no additional brightness compensation is required.

[0044] It should be noted that the above brightness level range is only an illustration of an embodiment of this application. Depending on the type of display product, the brightness range of these brightness levels can be adjusted accordingly.

[0045] In some embodiments, when the ambient light brightness level reaches a second brightness level or higher, regardless of whether it specifically reaches a second or third brightness level, the brightness compensation unit 24 outputs a fixed compensation value. In other embodiments, when the ambient light brightness level reaches a second brightness level, the brightness compensation unit 24 outputs a fixed compensation value; when the ambient light brightness level reaches a third brightness level, the brightness compensation unit 24 outputs another fixed compensation value, and the latter is greater than the former.

[0046] In other embodiments, the brightness of the ambient light is related to the compensation current output by the brightness compensation unit 24. When the brightness level of the ambient light reaches the second brightness level or above, even within the same brightness level range, the greater the brightness of the ambient light, the greater the compensation current output by the brightness compensation unit 24.

[0047] In some embodiments, the brightness compensation unit 24 includes a first current control switch 241, which is a single-gate transistor. After analyzing the brightness level of the ambient light, the brightness analysis unit 23 outputs a corresponding first current control signal Vsus. The input terminal of the first current control switch 241 is connected to the energy storage unit 22 to receive the compensation current provided by the energy storage unit 22; the control terminal of the first current control switch 241 is connected to the brightness analysis unit 23 to receive the first current control signal Vsus; and the output terminal of the first current control switch 241 is connected to the light-emitting unit OLED.

[0048] Correspondingly, when the ambient light brightness level is at the first brightness level, the voltage of the first current control signal Vsus is 0; when the ambient light brightness level is at the second brightness level, the voltage of the first current control signal Vsus is greater than 0 and less than the threshold voltage of the first current control switch 241; when the ambient light brightness level is at the third brightness level, the voltage of the first current control signal Vsus is greater than or equal to the threshold voltage of the first current control switch 241.

[0049] In this embodiment, the opening degree of the first current control switch 241 is controlled by a first current control signal Vsus. The first current control signal Vsus acts as the gate voltage of the first current control switch 241. The energy storage unit 22 outputs a fixed current value. The larger the voltage of the first current control signal Vsus, the greater the opening degree of the first current control switch 241, the more current passes through, and the greater the compensation current provided to the light-emitting unit OLED, thereby achieving the purpose of adaptive adjustment. Moreover, this design simplifies the circuit structure and facilitates structural design.

[0050] In some embodiments, a first current control switch 241 is provided in each pixel to facilitate brightness compensation of the OLED light-emitting units in each pixel. Furthermore, an energy storage unit 22 can also be provided in each pixel, allowing for both energy storage and supply within each pixel. Since there are many energy storage units 22, and each pixel can be individually powered, the problem of insufficient power supply is avoided. Of course, in other embodiments, the first current control switch 241 and the energy storage units 22 can be located in the non-display area. The first current control switch 241 simultaneously connects all the OLED light-emitting units in the display area, and power is supplied through several or one energy storage unit 22.

[0051] In some embodiments, such as Figure 2 As shown, the display panel 20 includes a plurality of first pixel units 20A, which are arranged in an array in the display area of ​​the display panel 20; the first pixel unit 20A includes a first scan line Scan1, a second scan line Scan2, a data line Data, a reset line Reset, a first switch T1, a second switch T2, a third switch T3, a fourth switch T4, a fifth switch T5, a sixth switch T6, a capacitor Cst, and a light-emitting unit OLED.

[0052] In this configuration, the input terminal of the first switch T1 is connected to the reset line Reset, and the control terminal of the first switch T1 is connected to the first scan line Scan1 to receive a first scan signal; the input terminal of the second switch T2 is connected to the data line Data, and the control terminal of the second switch T2 is connected to the second scan line Scan2 to receive a second scan signal; the input terminal of the third switch T3 receives the power signal VDD, and the control terminal of the third switch T3 receives the light emission control signal EMIT; the input terminal of the fourth switch T4 is connected to the output terminal of the third switch T3, and the control terminal of the fourth switch T4 is connected to the output terminals of the first switch T1 and the second switch T2; one end of the capacitor Cst is connected to the input terminal of the fourth switch T4, and the other end of the capacitor Cst is connected to the control terminal of the fourth switch T4.

[0053] The input terminal of the fifth switch T5 is connected to the output terminal of the fourth switch T4. The control terminal of the fifth switch T5 receives the light emission control signal EMIT. The output terminal of the fifth switch T5 is connected to the light emission unit OLED. The input terminal of the sixth switch T6 is connected to the reset line Reset. The control terminal of the sixth switch T6 is connected to the second scan line Scan2. The output terminal of the sixth switch T6 is connected to the output terminal of the fifth switch T5 and intersects at the first connection point A. The output terminal of the first current control switch 241 is connected to the output terminal of the fifth switch T5 and intersects at the second connection point B. The second connection point B is located between the first connection point A and the light emission unit OLED.

[0054] exist Figure 2 In this circuit, the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, and the photosensitive sensor 100 are all of the same type; they can all be N-type MOSFETs or P-type MOSFETs. Furthermore, the control terminals of the third switch T3, the fifth switch T5, and the photosensitive sensor 100 all receive and are controlled by the light emission control signal EMIT. Taking an N-type MOSFET as an example, when the light emission control signal EMIT is high, the third switch T3, the fifth switch T5, and the photosensitive sensor 100 are turned on; when the light emission control signal EMIT is low, the third switch T3, the fifth switch T5, and the photosensitive sensor 100 are turned off.

[0055] In this embodiment, each frame of the image goes through an initialization stage, a threshold value selection stage, and a light emission stage to ensure that the OLED light-emitting unit is restored to an ideal state before each current compensation and achieves the ideal brightness effect after compensation.

[0056] During the initialization phase, the first scan signal is a high-level signal, the second scan signal and the light emission control signal EMIT are low-level signals, the first switch T1 is turned on, and the fourth switch T4 is initialized.

[0057] During the threshold selection phase, the second scan signal is a high-level signal, while the first scan signal and the light emission control signal EMIT are low-level signals. The second switch T2 is turned on, allowing the data signal provided by the data line Data to be written into the gate of the fourth switch T4 and complete self-compensation. At the same time, the sixth switch T6 is turned on, and the initialization signal provided by the reset line Reset is transmitted to the light emission unit OLED, causing the light emission unit OLED to reset.

[0058] During the light-emitting phase, the light-emitting control signal EMIT is a high-level signal, while the first and second scan signals are low-level signals. The fourth switch T4 generates a driving current and causes the OLED to emit light. Simultaneously, the third switch T3 is turned on, and the power signal VDD is transmitted to the input of the fourth switch T4, causing the fourth switch T4 to generate a driving current. The fifth switch T5 is also turned on, transmitting the driving current to the OLED.

[0059] Under illumination, the photosensitive sensor 100 performs photoelectric conversion, forming electron-hole pairs inside the photosensitive sensor 100. During the light emission stage, the control terminal of the photosensitive sensor 100 is connected to a high-level light emission control signal EMIT, causing the electron-hole pairs in the photosensitive sensor 100 to separate under the action of an electric field, forming a photocurrent. When the first current control switch 241 is not yet turned on, the circuit in the closed state will first store the photocurrent in the energy storage unit 22.

[0060] In one specific implementation, when the ambient light brightness level is at the first brightness level, the first current control signal Vsus output by the brightness analysis unit 23 is 0, and the first current control switch 241 is closed. At this time, no compensation current is input to the OLED light-emitting unit. When the ambient light brightness level is at the second brightness level, the first current control signal Vsus output by the brightness analysis unit 23 is greater than 0 and less than the threshold voltage Vth of the first current control switch 241. At this time, only a portion of the current provided by the energy storage unit 22 flows into the OLED light-emitting unit. When the ambient light brightness level is at the third brightness level, the voltage of the first current control signal Vsus is greater than or equal to the threshold voltage Vth of the first current control switch 241, and as the voltage of the first current control signal Vsus increases, the threshold voltage Vth of the first current control switch 241 gradually increases.

[0061] like Figure 3 As shown, Figure 3 The horizontal axis in the graph represents the ambient light brightness value, and the vertical axis represents the voltage of the first current control signal Vsus. M represents the darkness level in the first brightness level, O represents the normal brightness level, P represents the second brightness level, and Q represents the third brightness level. As can be seen from the graph, the ambient light brightness is positively correlated with the voltage of the first current control signal Vsus, meaning the ambient light brightness is positively correlated with the current output by the first current control switch 241.

[0062] In some embodiments, each pixel in the display panel 20 is employed Figure 2The first pixel unit 20A is designed, and each pixel includes an energy storage unit 22 and a first current control switch 241. After determining the brightness level of the ambient light where the display panel 20 is located, the brightness analysis unit 23 performs brightness compensation for all display areas of the entire display panel 20 to improve the uniformity of overall brightness.

[0063] In some embodiments, the pixel units in the display panel 20 may also adopt a general 2T1C architecture or 3T1C architecture without the need for a reset design.

[0064] In some embodiments, such as Figure 4 As shown, the display panel 20 can also perform local brightness compensation. Specifically, the display panel 20 is divided into a display area, a camera area, and a non-display area. In the display area, each first pixel unit 20A contains an energy storage unit 22 and a first current control switch 241. In the camera area, the display panel 20 includes multiple second pixel units 20B, which are arranged in an array in the camera area of ​​the display panel 20. The brightness compensation unit 24 includes a second current control switch 242, which is disposed within the second pixel unit 20B. Each second pixel unit 20B contains an energy storage unit 22 and is connected to the second current control switch 242.

[0065] It should be noted that the structure of the first pixel unit 20A is the same as that of the second pixel unit 20B, except that the first pixel unit 20A is located in the display area of ​​the display panel, while the second pixel unit 20B is located in the camera area of ​​the display panel. Furthermore, the light-emitting unit in the first pixel unit 20A is connected to the first current control switch 241, and the light-emitting unit in the second pixel unit 20B is connected to the second current control switch 242. For the specific structural design of the second pixel unit 20B, please refer to the previous description; it will not be elaborated upon here.

[0066] The second current control switch 242 is a dual-gate transistor. Its input terminal is connected to the energy storage unit 22, receiving compensation current from the energy storage unit 22. Its first control terminal is connected to the brightness analysis unit 23, receiving the first current control signal Vsus. Its second control terminal is also connected to the brightness analysis unit 23, receiving a second current control signal. The second current control signal and the first current control signal Vsus are of different types. The output terminal of the second current control switch 242 is connected to the light-emitting unit OLED in the second pixel unit 20B.

[0067] With the rapid development of full-screen display technology, more and more screens are adopting punch-hole or aperture designs due to the presence of front-facing cameras, meaning that a portion of the screen surrounds the front-facing camera. In practical applications, such as in bright outdoor environments, the high brightness of the ambient light and the low brightness of the display area around the camera result in poor image quality. Therefore, this application embodiment provides stronger brightness compensation for the camera area.

[0068] like Figure 4 and Figure 5 As shown, the first control terminal of the second current control switch 242 receives the first current control signal Vsus. When the ambient light intensity is higher than the brightness of the display panel 20 itself (the brightness of the ambient light reaches the second brightness level or the third brightness level), the high-brightness ambient light is collected. At this time, the first current control signal Vsus is at a high level, and the voltage of the first current control signal Vsus is greater than or equal to the threshold voltage Vth of the first current control switch 241. At this time, photocurrent compensation is performed on the current of the light-emitting unit OLED according to the ambient light, thereby improving the brightness of the display panel 20. The second control terminal of the second current control switch 242 is used to receive the second current control signal Vsus'. When the camera function is turned on and the ambient light intensity is higher than the brightness of the display panel 20 itself (the brightness of the ambient light reaches the second brightness level or the third brightness level), the brightness analysis unit 23 outputs the second current control signal Vsus' to the second control terminal of the second current control switch 242. The second current control signal Vsus' is at a low level. At this time, since the voltage directions of the first control terminal and the second control terminal of the second current control switch 242 are opposite, they form electric fields with opposite directions with the source and drain, respectively, which have opposite effects on holes and electrons. Under the action of the two electric fields, the electron flow rate in the active layer of the second current control switch 242 is faster, the number of electrons attracted is more, and the on-state current is larger. At this time, the current input to the light-emitting unit OLED is larger, thereby making the brightness in the camera area greater than that in other areas, realizing local brightening of the camera position, so as to achieve the effect of targeted brightness compensation for the camera area and improve the overall display effect of the display panel 20.

[0069] like Figure 6 As shown, a brightness control method for a display panel is provided as a second embodiment of this application. The brightness control method is used to control the brightness of the display panel in the first embodiment, and the brightness control method includes the following steps:

[0070] S1: Receives ambient light and stores the photocurrent converted from the ambient light to form stored electrical energy;

[0071] S2: Detect ambient light brightness and analyze the brightness level of ambient light;

[0072] S3: When the brightness level of the ambient light reaches a preset level, during the light-emitting phase of the display panel, the stored electrical energy is used to provide compensation current to the light-emitting units in the display panel.

[0073] This application embodiment adjusts the brightness of the display panel by utilizing the intensity of ambient light, rather than by changing the voltage of the display panel itself. This reduces power consumption and significantly increases the lifespan of the display panel.

[0074] Specifically, in step S1, the ambient light brightness is detected using a light sensor. In step S2, such as... Figure 7 As shown, step S2 includes:

[0075] S21: Establish a digital compensation model for ambient light brightness levels and compensation current;

[0076] S22: Detect ambient light intensity and acquire an analog signal of ambient light intensity;

[0077] S23: Convert the analog signal of the ambient light brightness into a corresponding light intensity value;

[0078] S24: Analyze the brightness level corresponding to the light intensity value in the digital compensation model.

[0079] The digital compensation model can be similar to Figure 3 The two-dimensional coordinate system shown can also be represented by tables, formulas, software, etc. The digital compensation model is pre-stored in the register of the brightness analysis unit, which can be a chip. After the light sensor detects the ambient light brightness and outputs an analog signal, it converts the analog signal into a digital signal of light intensity value through an analog-to-digital converter. Then, the brightness analysis unit calls the digital compensation model to analyze the brightness level corresponding to the light intensity value in the digital compensation model.

[0080] In one specific implementation, the ambient light brightness level in the digital compensation model includes a first brightness level, a second brightness level, and a third brightness level. The brightness range of the first brightness level is 0 lux-100 lux, the brightness range of the second brightness level is 100 lux-1000 lux, and the brightness range of the third brightness level is 1000 lux-10000 lux. When the ambient light brightness level reaches the second brightness level, a first compensation current is provided to the light-emitting unit in the display panel through the stored electrical energy. When the ambient light brightness level reaches the third brightness level, a second compensation current is provided to the light-emitting unit in the display panel through the stored electrical energy. The second compensation current is greater than the first compensation current. This implementation can perform targeted current compensation according to different ambient light brightness levels, so that the output brightness of the display panel after compensation matches the ambient light brightness, improving the display effect of the display panel without depleting the battery.

[0081] In some embodiments, during step S3, the stored electrical energy provides a first compensation current to the light-emitting units located in the display area of ​​the display panel, and the stored electrical energy provides a second compensation current to the light-emitting units located in the camera area of ​​the display panel, wherein the second compensation current is greater than the first compensation current. This embodiment of the application improves the problem of poor image quality due to low brightness in the display area around the camera by performing targeted dimming on the camera area. For the structural design of the camera area and the display area, please refer to the description of the first pixel unit and the second pixel unit in the first embodiment, which will not be repeated here.

[0082] like Figure 8 As shown, the display device 10 provided in the third embodiment of this application includes a driving circuit 30 and a display panel 20 in the first embodiment. The driving circuit 30 is connected to the display panel 20 and is used to drive the display panel 20.

[0083] 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.

[0084] 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 method of brightness control of a display panel, characterized by, The method comprises the steps of: receiving ambient light and storing the photocurrent converted from the ambient light to form stored electric energy; establishing a digital compensation model of the brightness level of the ambient light and the compensation current; detecting the brightness of the ambient light to obtain an analog signal of the brightness of the ambient light; converting the analog signal of the brightness of the ambient light into a corresponding light intensity value; analyzing the corresponding brightness level of the light intensity value in the digital compensation model; and when the brightness level of the ambient light reaches a preset level, providing compensation current to the light emitting unit in the display panel through the stored electric energy in the light emitting stage of the display panel; wherein, in the step of providing compensation current to the light emitting unit in the display panel through the stored electric energy when the brightness level of the ambient light reaches a preset level, a first compensation current is provided to the light emitting unit in the display panel in the display area through the stored electric energy, a second compensation current is provided to the light emitting unit in the display panel in the camera area through the stored electric energy, and the second compensation current is greater than the first compensation current. The display panel comprises:

2. A display panel employing the brightness control method of claim 1, wherein a light sensor for detecting the brightness of the ambient light; an energy storage unit for storing the current converted from the ambient light to form stored electric energy; a brightness analysis unit connected with the light sensor, for analyzing the brightness level of the ambient light; and a brightness compensation unit connected with the brightness analysis unit and the energy storage unit, for providing compensation current to the light emitting unit in the display panel through the stored electric energy when the brightness level of the ambient light reaches a preset level, to improve the brightness of the light emitting unit. The brightness analysis unit outputs a corresponding first current control signal after analyzing the brightness level of the ambient light; the brightness compensation unit comprises a first current control switch, which is a single-gate transistor, the input end of the first current control switch is connected with the energy storage unit to receive the compensation current provided by the energy storage unit, the control end of the first current control switch is connected with the brightness analysis unit to receive the first current control signal, and the output end of the first current control switch is connected with the light emitting unit; 3. The display panel of claim 2, wherein, wherein, the brightness level of the ambient light comprises a first brightness level, a second brightness level and a third brightness level, the brightness range of the first brightness level is 0 lux-100 lux, the brightness range of the second brightness level is 100 lux-1000 lux, and the brightness range of the third brightness level is 1000 lux-10000 lux; when the brightness level of the ambient light is in the first brightness level, the voltage of the first current control signal is 0; when the brightness level of the ambient light is in the second brightness level, the voltage of the first current control signal is greater than 0 and less than the threshold voltage of the first current control switch; when the brightness level of the ambient light is in the third brightness level, the voltage of the first current control signal is greater than or equal to the threshold voltage of the first current control switch. ​ 4. The display panel of claim 3, wherein, The display panel comprises a plurality of first pixel units arranged in an array in a display area of the display panel; the first pixel unit comprises a first scan line, a second scan line, a data line, a reset line, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a capacitor and a light-emitting unit; The input end of the first switch is connected with the reset line, and the control end of the first switch is connected with the first scan line; the input end of the second switch is connected with the data line, and the control end of the second switch is connected with the second scan line; the input end of the third switch receives a power supply signal, and the control end of the third switch receives a light-emitting control signal; the input end of the fourth switch is connected with the output end of the third switch, and the control end of the fourth switch is connected with the output end of the first switch and the output end of the second switch; one end of the capacitor is connected with the input end of the fourth switch, and the other end of the capacitor is connected with the control end of the fourth switch; The input end of the fifth switch is connected with the output end of the fourth switch, the control end of the fifth switch receives the light-emitting control signal, and the output end of the fifth switch is connected with the light-emitting unit; the input end of the sixth switch is connected with the reset line, the control end of the sixth switch is connected with the second scan line, the output end of the sixth switch is connected with the output end of the fifth switch and is connected to a first connection point, and the output end of the first current control switch is connected with the output end of the fifth switch and is connected to a second connection point, the second connection point being located between the first connection point and the light-emitting unit.

5. The display panel of claim 4, wherein, The first current control switch and the energy storage unit are arranged in each first pixel unit.

6. The display panel of any of claims 3-5, wherein, The display panel comprises a plurality of second pixel units arranged in an array in a camera area of the display panel; The brightness compensation unit comprises a second current control switch, the second current control switch being a double-gate transistor, the input end of the second current control switch being connected with the energy storage unit and receiving a compensation current provided by the energy storage unit, and the first control end of the second current control switch being connected with the brightness analysis unit and receiving the first current control signal; The second control end of the second current control switch is connected with the brightness analysis unit and receives a second current control signal, the second current control signal and the first current control signal being different in type; The output end of the second current control switch is connected with a light-emitting unit in the second pixel unit.

7. A display device, characterized by comprising: The display panel comprises a plurality of first pixel units arranged in an array in a display area of the display panel; the first pixel unit comprises a first scan line, a second scan line, a data line, a reset line, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a capacitor and a light-emitting unit;

Images