CN110718190A - Voltage adjustment method, pixel circuit, and electronic device - Google Patents

Abstract

The embodiment of the present application discloses a voltage adjustment method, a pixel circuit, and an electronic device, wherein the method includes: determining the working voltage of at least one light-emitting element in the first display area covering the camera, the light-emitting element being arranged in the first display area of the camera. In a pixel circuit in a display area, the voltage adjustment amount of the cathode voltage terminal VSS of the first display area is determined according to the variation of each of the working voltages relative to the reference voltage; The voltage of the VSS is used to restore the working voltage of the light-emitting element to a specific voltage range, so that the driving element in the pixel circuit for driving the light-emitting element to emit light works in the saturation region.

Description

Voltage adjustment method, pixel circuit, and electronic device

technical field

The embodiments of the present application relate to electronic technologies, but are not limited to voltage adjustment methods, pixel circuits, and electronic devices.

Background technique

Display panels, such as organic light-emitting diode (Organic Light-Emitting Diode, OLED) displays, have many advantages such as wide viewing angle, high contrast, fast response, low power consumption, foldable and flexible, etc. Has a strong competitiveness.

With the extensive development and application of OLED technology, high screen-to-body ratio displays with better visual experience have become the mainstream direction of current display technology development, especially mobile phones with truly full-screen displays are favored by consumers. In order not to affect the camera function of the mobile phone, the camera is covered by the screen, that is, the camera is set at the bottom of the screen.

However, such a mobile phone with an under-screen camera has the problem of uneven brightness when displaying content, resulting in a degraded user's visual experience.

SUMMARY OF THE INVENTION

In view of this, embodiments of the present application provide a voltage adjustment method, a pixel circuit, and an electronic device.

The technical solutions of the embodiments of the present application are implemented as follows:

In a first aspect, an embodiment of the present application provides a voltage adjustment method, the method includes: determining a working voltage across at least one light-emitting element in a first display area covering a camera, the light-emitting element being disposed in the first display area In the pixel circuit of ; determine the voltage adjustment amount of the cathode voltage terminal VSS of the first display area according to the variation of each of the working voltages relative to the reference voltage; adjust the VSS according to the voltage adjustment The voltage of the light-emitting element is restored to a specific voltage range, so that the driving element in the pixel circuit for driving the light-emitting element to emit light works in the saturation region.

In a second aspect, an embodiment of the present application provides a pixel circuit, the pixel circuit is disposed in a first display area covering a camera, and the pixel circuit includes: a driving element, a light-emitting control module, a light-emitting element, a voltage detection module, and a voltage Adjustment module; wherein, the light-emitting control module has a first end and a second end, the first end is connected to the first end of the driving element, the second end is connected to the anode of the light-emitting element, The light-emitting control module is used to control the current flowing through the driving element to be transmitted to the anode of the light-emitting element, so as to drive the light-emitting element to emit light; the voltage detection module is connected to the anode of the light-emitting element and uses When the light-emitting element is in the light-emitting stage, the anode voltage of the light-emitting element is detected; the cathode of the light-emitting element is connected to the cathode voltage terminal VSS of the first display area; the voltage adjustment module is used for The difference between the anode voltage of the light-emitting element and the voltage of the VSS is determined as the working voltage of the light-emitting element, and the voltage of the VSS is adjusted according to the change of the working voltage relative to the reference voltage. voltage, so that the working voltage of the light-emitting element is restored to within a specific voltage range, so that the driving element works in the saturation region.

In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and when the processor executes the program, any of the embodiments of the present application can be implemented. a step in the voltage regulation method.

In a fourth aspect, an embodiment of the present application provides an electronic device, including a display screen body, wherein the pixel density of the first display area of the display screen body is less than or equal to the pixel density of the second display area of the display screen body, so The first display area includes the pixel circuit described in any one of the embodiments of the present application.

In the embodiment of the present application, the electronic device adjusts the cathode voltage of the light-emitting element by determining the change of the working voltage of the light-emitting element in the first display area, so that the working voltage of the light-emitting element is restored to a specific voltage range, thereby making the pixel circuit The driving element for driving the light-emitting element to emit light works in the saturation region; in this way, the problem of uneven display on the entire screen caused by the aging of the light-emitting element is solved, thereby improving the user's visual experience.

Description of drawings

1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

2A is a schematic structural diagram of a pixel circuit according to an embodiment of the present application;

FIG. 2B is a schematic structural diagram of another pixel circuit according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an implementation flowchart of a voltage regulation method according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of an implementation of another voltage adjustment method according to an embodiment of the present application;

6 is a schematic structural diagram of yet another pixel circuit according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of another pixel circuit according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a hardware entity of an electronic device according to an embodiment of the present application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are used to illustrate the present application, but are not intended to limit the scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" can be the same or a different subset of all possible embodiments, and Can be combined with each other without conflict.

It should be pointed out that the term "first\second\third" involved in the embodiments of the present application is only to distinguish similar objects, and does not represent a specific ordering of objects. It is understandable that "first\second\third" "Where permitted, the specific order or sequence may be interchanged to enable the embodiments of the application described herein to be practiced in sequences other than those illustrated or described herein.

The embodiment of the present application first provides an electronic device. FIG. 1 is a schematic structural diagram of the electronic device according to the embodiment of the present application. As shown in FIG. 1 , the electronic device 10 includes a display screen body 101 and a camera, and displays a first display area of the screen body 101 The pixel density of 1011 is less than or equal to the pixel density of the second display area 1012 of the display screen body 101; wherein, the first display area 1011 covers the top of the camera, and both the first display area 1011 and the second display area 1012 include the The pixel circuit described in any one of the application embodiments. Generally speaking, the display screen of the display screen body is a rectangular or square whole screen.

It should be noted that, in this embodiment of the present application, the shape of the first display area may be various, for example, the shape of the first display area is a circle, a square, an ellipse, and the like. The pixel circuits of the first display area may be the same as or different from the pixel circuits of the second display area. The pixel circuit or the voltage adjustment method described in the embodiments of the present application is also applicable to the second display area.

In some embodiments, the structure of at least one pixel circuit in the first display area, as shown in FIG. 2A , the pixel circuit 20 includes: a driving element 201 , a light-emitting control module 202 , a light-emitting element 203 , a voltage detection module 204 and a voltage Adjustment module 205; wherein,

The light-emitting control module 202 has a first end and a second end. The first end is connected to the first end of the driving element 201, and the second end is connected to the anode of the light-emitting element 203. The light-emitting control module 202 is used to control the The current flowing through the driving element 201 is transferred to the anode of the light emitting element 203 to drive the light emitting element 203 to emit light.

In the pixel circuit 20, the light emission control module 202 may include a second thin film transistor (Thin Film Transistor, TFT) and a second control terminal EM2. The driving element 201 may be a component with a driving function. For example, the driving element 201 is a driver thin film transistor (Driver Thin Film Transistor, DTFT), but the device model of the driving element 201 is not limited in the embodiments of the present application.

The voltage detection module 204 is connected to the anode of the light-emitting element 203 for detecting the anode voltage of the light-emitting element 203 when the light-emitting element 203 is in the light-emitting stage; the cathode of the light-emitting element 203 is connected to the cathode voltage terminal VSS of the first display area .

It should be noted that the VSS of the first display area may be shared with the VSS of the second display area, or each may be independently connected to a VSS.

In the pixel circuit 20, the voltage detection module 204 may include a third TFT (T3 for short), a third control terminal Con, and a sensor, wherein T3 is controlled by a third control signal output from the third control terminal Con to turn on the sensor and the sensor. The circuit between the anodes of the light-emitting element 203 enables the sensor to detect the anode voltage of the light-emitting element 203 . During implementation, the voltage detection module 204 may periodically collect the anode voltage of the light-emitting element 203 according to a certain sampling frequency, and transmit the collected anode voltage to the voltage adjustment module 205 in real time.

The voltage adjustment module 205 is used to determine the difference between the anode voltage of the light-emitting element 203 and the voltage of the VSS as the working voltage across the light-emitting element 203, and according to the change of the working voltage relative to the reference voltage The voltage of the VSS is adjusted to restore the operating voltage of the light-emitting element 203 to a specific voltage range, so that the driving element 201 operates in the saturation region.

Understandably, since the cathode of the light-emitting element 203 is connected to VSS, the voltage of VSS is the cathode voltage of the light-emitting element 203 . Generally speaking, the reference voltage may be the operating voltage of the light-emitting element 203 when the driving element 201 operates in the saturation region.

It should be noted that the manner of adjusting the voltage of the VSS is related to the variation. For example, the variation indicates that when the working voltage across the light-emitting element increases relative to the reference voltage, the voltage of the VSS is pulled down; otherwise, the voltage of the VSS is increased. In another embodiment, the voltage of the VSS is adjusted only when the variation satisfies a specific condition, otherwise the current voltage of the VSS is maintained, and the current voltage of the VSS is not adjusted.

The display area of the display screen body is set to have a second display area and a first display area covering the camera, thereby realizing an electronic device with a full screen. However, as the use time of this type of electronic equipment increases, the problem of uneven display brightness of the entire screen gradually occurs.

Based on this, the inventor found in research that since the pixel density of the first display area is smaller than that of the second display area, in order to keep the brightness of the first display area and the second display area consistent, it is generally required that the first display area The pixel brightness is higher than the pixel brightness of the second display area; however, this causes the transistors (such as TFT, OLED, etc.) in the first display area to gradually age, and the aging of the OLED will increase the operating voltage of the OLED. As a result, the driving element (eg, DTFT) for driving the OLED to emit light is shifted from the saturation region, thereby causing uneven brightness between the first display area and the second display area.

In order to solve the problem of uneven display brightness of the screen as a whole, in an embodiment of the present application, a pixel circuit is provided. When the pixel circuit is working, the voltage detection module in the pixel circuit detects the anode voltage of the light-emitting element; The module determines the working voltage of the light-emitting element according to the difference between the anode voltage of the light-emitting element and the voltage of the VSS; and adjusts the voltage of the VSS according to the variation of the working voltage relative to the reference voltage, so that the light-emitting element can emit light. The operating voltage of the element is restored to within a specific voltage range, so that the driving element operates in the saturation region, so that the display brightness of the first display area is consistent with the display brightness of the second display area.

In some embodiments, the voltage adjustment module 205 is configured to: when the variation represents an increase in the working voltage across the light-emitting element 203 , pull down the voltage of the VSS by the variation, so that the voltage of the light-emitting element 203 is increased. The operating voltage is restored to within the specified voltage range.

In another embodiment, the voltage adjustment module 205 is configured to: when the variation represents an increase in the working voltage across the light-emitting element 203, and the variation is greater than a specific threshold, pull the voltage of the VSS down by a predetermined amount. the amount of change described.

In some embodiments, as shown in FIG. 2B, the pixel circuit 20 further includes: a voltage writing control module 206, the module 206 has a third terminal and a fourth terminal, the third terminal is connected to the anode of the first display area The voltage terminal VDD is connected, and the fourth terminal is connected to the second terminal of the driving element 201 ; the voltage writing control module 206 is used for controlling the VDD to write the output power supply voltage signal into the driving element 201 .

In the pixel circuit, the voltage writing control module may include a first TFT (T1 for short) and a first control terminal EM1. Under the control of the first control signal output from the first control terminal EM1, T1 turns on the circuit between VDD and the driving element, thereby writing the power supply voltage signal output by VDD into the driving element.

It should be noted that the first display area and the second display area may share one VDD or not, that is, the first display area is connected to the first VDD, and the second display area is connected to the second VDD.

An embodiment of the present application further provides a pixel circuit in the first display area. FIG. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present application. As shown in FIG. 3 , the pixel circuit 30 includes: a first thin film transistor T1 , a first control terminal EM1, a driving transistor DTFT, a second thin film transistor T2, a second control terminal EM2, a third thin film transistor T3, a third control terminal Con, an organic light emitting diode OLED, a capacitor C, a sensor 301 and a controller 302; in,

The first terminal of T1 is connected to VDD, the second terminal of T1 is connected to the first control terminal EM1, and the third terminal of T1 is connected to the source (Source, S) of the DTFT.

It should be noted that T1 and the first control terminal EM1 belong to the circuit elements in the voltage writing module described in the above embodiments.

The first end of the capacitor C is connected to VDD, and the second end of the capacitor C is connected to the gate (Grid, G) of the DTFT;

The first end of T2 is connected to the drain (Drain, D) of the DTFT, the second end of T2 is connected to the second control end EM2, the third end of T3 is connected to the anode of the OLED, and the cathode of the OLED is connected to VSS.

It should be noted that, T2 and the second control terminal EM2 belong to the circuit elements in the lighting control module described in the above embodiments.

The first end of T3 is connected to the anode of the OLED, the second end of T3 is connected to the sensor 302, and the third end of T3 is connected to the third control end Con. The sensor 301 is connected to the controller 302 .

It should be noted that T3, the sensor 301 and the third control terminal Con belong to the circuit elements in the voltage detection module described in the embodiment.

When the pixel circuit is working, under the control of the first control signal output by EM1, T1 turns on the circuit between VDD and the S pole of DTFT, so that the power supply voltage signal output by VDD is written into the source of DTFT; T2 is in EM2 Under the control of the output second control signal, the circuit between the D electrode of the DTFT and the anode of the OLED is turned on, so that the current flowing through the DTFT is transmitted to the anode of the OLED, thereby driving the OLED to emit light. When the OLED is in the light-emitting stage, T3 turns on the circuit between the anode of the OLED and the sensor 301 under the control of the third control signal output by Con, so that the sensor 301 obtains the anode voltage of the OLED; the sensor 301 converts the anode voltage of the OLED to It is transmitted to the controller 302, and the controller 302 is configured to: determine the working voltage across the OLED according to the anode voltage of the OLED and the voltage of the VSS, and determine the voltage increment of the OLED according to the working voltage and the reference voltage, The voltage of VSS is then pulled down by the voltage increment. In addition, the capacitor C is used to stabilize the voltage of the G electrode of the DTFT when the pixel circuit works.

Based on the pixel circuit provided by the foregoing embodiment, the embodiment of the present application provides a voltage adjustment method, and the method is applied to an electronic device. The electronic device may be any device with an under-screen camera. For example, the electronic device is Phones, tablets, smart watches, etc. with full screen.

FIG. 4 is a schematic flowchart of the implementation of the voltage regulation method according to an embodiment of the present application. As shown in FIG. 4 , the method may at least include the following steps 401 to 403:

Step 401: Determine the working voltage of at least one light-emitting element in the first display area covering the camera, where the light-emitting element is arranged in the pixel circuit of the first display area.

In one example, the difference between the anode voltage and the cathode voltage of the light-emitting element is determined as the working voltage of the light-emitting element, wherein the cathode of the light-emitting element can be connected to the VSS of the first display area, so that the cathode of the light-emitting element can be connected to the VSS of the first display area. The voltage is equal to the voltage of VSS. In addition, one pixel circuit includes at least a light-emitting element and a driving element for driving the light-emitting element to emit light. For example, the driving element is a DTFT.

In some embodiments, the electronic device may start to perform step 401 when its accumulated display duration exceeds a certain duration threshold. In this way, on the one hand, the problem of uneven brightness of the entire screen caused by the aging of the light-emitting elements in the pixel circuit can be solved; on the other hand, step 401 is not executed after the electronic device leaves the factory, which can reduce the workload of the electronic device. , thereby saving power consumption for the electronic device, so as to improve the battery life of the electronic device.

Step 402: Determine the voltage adjustment amount of the cathode voltage terminal VSS of the first display area according to the variation of each of the working voltages relative to the reference voltage.

In some embodiments, the electronic device may select a target change amount greater than a certain threshold from all the determined change amounts, and then determine the voltage adjustment amount of the VSS according to the target change amount. The number of the determined target change amounts is different, and the methods for determining the voltage adjustment amount of the VSS are also different correspondingly. For example, when there are multiple target variation amounts, the average value of the multiple target variation amounts may be determined as the voltage regulation amount of the VSS, so that the accuracy of the voltage regulation can be improved, and the driving element can work in saturation Or, determine the maximum variation among the plurality of target variation as the voltage adjustment value of the VSS; when there is only one target variation, the target variation may be determined as the VSS voltage adjustment Voltage adjustment amount; when the number of the target change amount is 0, return to step 401 .

Step 403: Adjust the voltage of the VSS according to the voltage adjustment amount, so that the working voltage of the light-emitting element is restored to a specific voltage range, so that the pixel circuit for driving the light-emitting element to emit light can be adjusted. The driving element works in the saturation region.

In some embodiments, when the working voltage across the light-emitting element is increased relative to the reference voltage, the voltage of the VSS can be pulled down by the voltage adjustment amount; on the contrary, when the working voltage of the light-emitting element is higher than the reference voltage When the voltage decreases, the voltage of the VSS may be increased by the voltage regulation amount.

It should be noted that the voltage adjustment method provided by the embodiment of the present application can also act on the second display area of the electronic device, and the second display area may have the pixel circuit described in any embodiment of the present application. In this way, the problem of uneven display on the entire screen caused by the aging of the OLED elements in the second display area can be solved.

In the embodiment of the present application, the electronic device adjusts the cathode voltage of the light-emitting element by determining the variation of the operating voltage across the light-emitting element in the first display area, so that the operating voltage of the light-emitting element is restored to a specific voltage range, thereby making the pixel The driving element in the circuit for driving the light-emitting element to emit light works in the saturation region; in this way, the problem of uneven display on the entire screen caused by the aging of the light-emitting element is solved, thereby improving the user's visual experience.

An embodiment of the present application further provides a voltage regulation method. FIG. 5 is a schematic flowchart of an implementation of another voltage regulation method according to an embodiment of the present application. As shown in FIG. 5 , the method may at least include the following steps 501 to 506 :

Step 501: Detect the anode voltage of at least one light-emitting element in the first display area covering the camera and the voltage of the cathode voltage terminal VSS of the first display area, and the light-emitting element is arranged in the pixel circuit of the first display area .

In some embodiments, the electronic device may start to perform the implementation steps included in the voltage adjustment method when the accumulated display duration of the electronic device exceeds a specific duration threshold and the electronic device is performing content display. For example, when the accumulated display time of the smartphone exceeds 720 hours after the smartphone is shipped, the smartphone starts to detect the anode voltage of the light-emitting element and the voltage of the VSS when displaying content. Instead of performing step 501 once the mobile phone displays content after the mobile phone leaves the factory, on the one hand, the power consumption of the mobile phone can be saved, and on the other hand, the problem of uneven brightness caused by the aging of light-emitting elements such as OLEDs can be solved.

In addition, the electronic device can sample the anode voltage through a sensor directly connected to the light-emitting element; and can also sample the anode voltage through a sensor indirectly connected to the light-emitting element.

When performing step 501, the electronic device can detect the anode voltage of the light-emitting element and the voltage of the VSS in real time according to a specific sampling frequency. In one example, the electronic device can directly determine the difference between the anode voltage collected in real time and the voltage of the VSS as the working voltage across the light-emitting element; A plurality of anode voltages in a sliding window determine an average anode voltage, and then the difference between the average anode voltage and the voltage of the VSS is determined as the working voltage across the light-emitting element.

Step 502: Determine the difference between the anode voltage and the voltage of the VSS as the working voltage across the light-emitting element.

Step 503, determining the variation of the working voltage across the light-emitting element in each of the pixel circuits relative to the reference voltage;

Step 504, from at least one of the variation amounts, determine whether there is a target variation amount greater than a certain threshold; if yes, go to step 505; otherwise, return to step 501 to re-detect the anode voltage of the light-emitting element.

It should be noted that when there is no target change greater than a specific threshold among all the determined changes, the electronic device may return to and re-execute step 501 after a preset period of time. In this way, the workload of the electronic device can be reduced, thereby saving power. consumption.

In some embodiments, the electronic device may further take any variation from at least one of the variation as the target variation.

Step 505: Determine the voltage adjustment amount of the VSS according to the determined target change amount.

In some embodiments, the largest change amount among the determined target change amounts is determined as the voltage adjustment amount. In another embodiment, the electronic device may determine any target change amount determined as the voltage adjustment amount of the VSS.

Step 506 , when the target variation represents an increase in the working voltage of the light-emitting element, the voltage of the VSS is pulled down by the voltage adjustment value, so that the working voltage of the light-emitting element is restored to the specified value. within a specific voltage range, so that the driving elements in the pixel circuit work in the saturation region.

It can be understood that, as the use time of the electronic device increases, the light-emitting element gradually ages, which leads to an increase in the operating voltage of the light-emitting element, and further causes the driving element connected to the light-emitting element to shift from the saturation region. Based on this, in the embodiment of the present application, the voltage of the VSS is lowered as much as the operating voltage of the light-emitting element increases, so as to ensure that the anode voltage of the light-emitting element returns to a specific voltage range, thereby ensuring that the driving element operates in the saturation region; In this way, the problem of uneven display brightness of the entire screen caused by the aging of the light-emitting element is solved.

A mobile phone screen using an under-screen camera, such as shown in FIG. 1, is divided into a normal pixel density (Pixels PerInch, PPI) area and a low PPI area; wherein, the normal PPI area, that is, the second display area 1012 shown in FIG. 1, also It is called the H area; the low PPI area, that is, the first display area 1011 shown in FIG. 1 , is also called the L area. For example, the pixel density of the H area is 400, and the pixel density of the L area is 200, so that the pixel density of the L area is less than that of the H area. In order to keep the brightness of the H area and the L area consistent, the pixel brightness of the L area must be higher than that of the H area. However, this causes aging of the TFT devices and OLED devices in the L region. The aging of the OLED device will cause the working voltage of the OLED device to increase, which will cause the DTFT to shift to the saturation region, thereby causing the overall display brightness uniformity of the screen to deteriorate.

Based on this, an exemplary application of the embodiments of the present application in a practical application scenario will be described below.

The embodiment of the present application proposes to add a TFT to the pixel circuit in the L region to detect the voltage Voled of the _OLED (that is, the working voltage across the voltage), or add a TFT to all the pixel circuits in the L region, or choose any one or a few pixels to increase the TFT. As shown in FIG. 6 , it shows the pixel circuit in the H region. In the embodiment of the present application, there is no requirement for the structure of the pixel circuit, as long as the pixel circuit includes a TFT that can be used to detect the anode voltage of the OLED.

It should be noted that the pixel circuit in the H region may be the same as or different from the pixel circuit in the L region.

As shown in Figure 7, the left figure shows a pixel circuit with one TFT (ie T3) added, and the equivalent circuit of the pixel circuit in the L region when it emits light is shown in the right figure in Figure 7, which is integrated when it emits light. A circuit (Integrated Circuit, IC) samples the anode voltage of the OLED. T1 and T2 are in the linear region under the control of the luminescence control signal EM. For the consistency of light emission, Vgs and Vgd of DTFT work together to ensure that DTFT works in the saturation region.

Understandably, because the L region is a low PPI region, the number of light-emitting pixels is less than the number of light-emitting pixels in the H region. Therefore, in order to make the brightness of the H and L regions consistent, the OLED device in the L region must increase the brightness, so that the cross voltage Voled of the _OLED increases accordingly, that is, the Vo-VSS voltage difference increases. The increase in the OLED cross-voltage in the L region due to this reason is denoted as: VOLEDL-VOLEDH=δV1.

In addition, because the OLED in the L region is in a high brightness state for a long time, the aging of the OLED device in the L region is larger and faster than that of the OLED in the H region, and the aging brings about an increase in the _OLED cross-voltage Voled. The increase in the OLED cross-voltage in the L region due to this reason is denoted as: VOLEDL-VOLEDH=δV2.

In the embodiment of the present application, in order to ensure that the DTFT works in the saturation region, δV1 and δV2 are consumed by pulling down the voltage of VSS, that is, the voltage of the VSS is pulled down as much as the operating voltage of the OLED increases, which can ensure that the OLED is pulled down. The device anode voltage Vo remains unchanged, thereby ensuring that the VDS of the DTFT is not affected, thereby ensuring that the DTFT operates in the saturation region.

In the embodiment of the present application, in order to timely understand the change of the OLED cross-voltage, TFT3 (ie, T3 shown in FIG. 7 ) is added to the pixel circuit in the L area, and T8 is turned on in the light-emitting area, and the IC samples the voltage of the anode of the OLED, and Feedback to VSS to adjust the amount by which VSS is pulled down. With the different use time, the sampled anode voltage becomes larger and larger, and the Vo-VSS becomes larger and larger. In some embodiments, the increased OLED operating voltage is consumed by pulling down VSS. Moreover, the sampling frequency of the OLED anode by the IC is adjustable.

In some embodiments, the VSS of the H region can be shared with the VSS of the L region, but this will increase power consumption because the VSS pull-down magnitude of the H region is smaller than that of the L region. In another embodiment, the VSS of the H region and the VSS of the L region are separated, so that the VSS adjustment of the L region does not affect the VSS of the H region, but the power consumption of the L region is increased, but the H region does not increase.

In the embodiment of the present application, firstly, the voltage across the OLED is increased by pulling down the VSS, so as not to affect the DTFT, thereby ensuring display uniformity; secondly, by pulling down the VSS to increase the consumption of the OLED Large OLED cross-voltage to keep the OLED anode voltage unchanged; third, by increasing T3, the IC samples the OLED anode voltage and feeds it back to VSS to determine the amount of VSS pulled down; fourth, the VSS and L regions in the H region The VSS can be shared or separated and used independently.

An embodiment of the present application provides an electronic device, and FIG. 8 is a schematic diagram of a hardware entity of the electronic device according to the embodiment of the present application. As shown in FIG. 8 , the hardware entity of the electronic device 800 includes: a memory 801 and a processor 802 . The memory 801 stores a computer program that can be executed on the processor 802, and when the processor 802 executes the program, the steps in the voltage regulation method provided in the above embodiment are implemented.

The memory 801 is configured to store instructions and applications executable by the processor 802, and can also cache data to be processed or processed by the processor 802 and various modules in the electronic device 800 (eg, image data, audio data, voice communication data and video communication data), which can be implemented by flash memory (FLASH) or random access memory (Random Access Memory, RAM).

It should be noted that, in the embodiments of the present application, if the above-mentioned voltage adjustment method is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be embodied in the form of software products in essence or the parts that contribute to related technologies. The computer software products are stored in a storage medium and include several instructions to make Electronic devices (which may be mobile phones, tablet computers, smart watches, notebook computers, desktop computers, robots, drones, etc.) perform all or part of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a read only memory (Read Only Memory, ROM), a magnetic disk or an optical disk and other mediums that can store program codes. As such, the embodiments of the present application are not limited to any specific combination of hardware and software.

It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation. The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the coupling, or direct coupling, or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical or other forms. of.

The units or modules described above as separate components may or may not be physically separated, and the components displayed as units or modules may or may not be physical units; some or all of them can be selected according to actual needs modules or units to achieve the purpose of the solution in this embodiment.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by program instructions related to hardware, the aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, the execution includes: The steps of the above method embodiments; and the aforementioned storage medium includes: a removable storage device, a read only memory (Read Only Memory, ROM), a magnetic disk or an optical disk and other media that can store program codes.

The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined under the condition of no conflict to obtain new method embodiments.

The features disclosed in the several product embodiments provided in this application can be combined arbitrarily without conflict to obtain a new product embodiment.

The features disclosed in several method or device embodiments provided in this application can be combined arbitrarily without conflict to obtain new method embodiments or device embodiments.

The above is only the embodiment of the present application, but the protection scope of the present application is not limited to this. Covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (10)

1. A method of voltage regulation, the method comprising:

determining an operating overpressure of at least one light emitting element in a first display area covering a camera, the light emitting element being arranged in a pixel circuit of the first display area;

determining the voltage regulation quantity of a cathode voltage terminal VSS of the first display area according to the variation quantity of each working voltage relative to a reference voltage;

and adjusting the voltage of the VSS according to the voltage adjustment quantity to restore the working cross voltage of the light-emitting element to a specific voltage range, so that a driving element used for driving the light-emitting element to emit light in the pixel circuit works in a saturation region.

2. The method of claim 1, wherein determining the operating cross-voltage of at least one light emitting element in the first display region overlying the camera comprises:

detecting an anode voltage of the light emitting element and a voltage of the VSS;

and determining the difference between the anode voltage and the VSS voltage as the working voltage of the light-emitting element.

3. The method of claim 2, further comprising:

determining from at least one of the variations whether there is a target variation greater than a particular threshold;

if not, the anode voltage of the light emitting element is detected again;

correspondingly, the determining the voltage adjustment amount of the cathode voltage terminal VSS of the first display region according to the variation of each working voltage with respect to the reference voltage includes:

and if the target variation which is larger than the specific threshold value exists in at least one variation, determining the voltage regulating quantity according to the determined target variation.

4. The method of claim 3, wherein determining the voltage adjustment based on the determined target amount of change comprises:

and determining the maximum variation in the determined target variations as the voltage adjustment amount.

5. The method of claim 3, wherein the adjusting the voltage of the VSS according to the voltage adjustment amount comprises:

and when the target variation quantity represents that the working voltage across the light-emitting element is increased, pulling the voltage of the VSS down by the voltage adjustment quantity so as to restore the working voltage across the light-emitting element to be within the specific voltage range.

6. A pixel circuit, wherein the pixel circuit is disposed in a first display region covering a camera, the pixel circuit comprising: the device comprises a driving element, a light emitting control module, a light emitting element, a voltage detection module and a voltage regulation module; wherein,

the light-emitting control module is provided with a first end and a second end, the first end is connected with the first end of the driving element, the second end is connected with the anode of the light-emitting element, and the light-emitting control module is used for controlling the current flowing through the driving element to be transmitted to the anode of the light-emitting element so as to drive the light-emitting element to emit light;

the voltage detection module is connected with the anode of the light-emitting element and is used for detecting the anode voltage of the light-emitting element when the light-emitting element is in a light-emitting stage; the cathode of the light emitting element is connected with a cathode voltage terminal VSS of the first display region;

the voltage adjusting module is configured to determine a difference between an anode voltage of the light emitting element and the VSS voltage as a working voltage of the light emitting element, and adjust the VSS voltage according to a variation of the working voltage with respect to a reference voltage, so that the working voltage of the light emitting element is restored to a specific voltage range, and the driving element operates in a saturation region.

7. The pixel circuit according to claim 6, further comprising:

a voltage write control module having a third terminal connected to an anode voltage terminal VDD of the first display region and a fourth terminal connected to a second terminal of the driving element; and the voltage write-in control module is used for controlling the VDD to write the output power supply voltage signal into the driving element.

8. The pixel circuit of claim 6, wherein the voltage adjustment module is configured to:

when the variation represents that the working voltage across the light-emitting element is increased, the voltage of the VSS is reduced by the variation, so that the working voltage across the light-emitting element is restored to be within the specific voltage range.

9. An electronic device comprising a memory and a processor, the memory storing a computer program operable on the processor, wherein the processor implements the steps of the voltage regulation method of any one of claims 1 to 5 when executing the program.

10. An electronic device, comprising a display screen body, wherein a pixel density of a first display region of the display screen body is less than or equal to a pixel density of a second display region of the display screen body, and the first display region comprises the pixel circuit according to any one of claims 6 to 8.

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