Screen compensation circuit, method and electronic device

Abstract

The present disclosure discloses a screen compensation circuit, method and electronic device, and relates to the technical field of screen display. The specific implementation scheme is: in the reset stage, a first scan signal line inputs a low potential, and a second scan signal line inputs a high potential, so that the potential of the first node is reset; in the detection stage, the first scan signal line inputs the high potential, the second scan signal line inputs the low potential, and the detection potential of the first node is obtained; in the compensation stage, the compensation data amount is obtained according to the detection potential, and the pixel driving circuit is compensated according to the compensation data amount. After the reset and detection, the present embodiment can obtain the compensation data amount according to the detection potential and compensate the pixel driving circuit. The present embodiment can reduce the brightness difference of different areas of the screen caused by temperature rise, and improve the screen display effect.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of screen display, and in particular to a screen compensation circuit, a method and an electronic device. BACKGROUND

[0002] Organic Light-Emitting Diode (OLED) screens have the characteristics of wide color gamut, high contrast, and flexible bending, and gradually become the standard configuration of high-end mobile phones. In recent years, OLED has moved from rigid glass substrates to Polyimide Film (PI) flexible substrate products, and PI film has also made new breakthroughs in large-size and camera under panel schemes. Since the PI substrate has poor heat dissipation, and there are some unbound and freely movable groups at the interface between PI and inorganic film layers, under a front electric field, the groups will form aggregation and diffusion. This will cause redistribution of the Thin Film Transistor (TFT) back channel parasitic capacitance, and the temperature will accelerate the movement of the above groups, causing the electrical property of the TFT to shift after the parasitic capacitance changes. And low-temperature polysilicon is very sensitive to temperature, which will cause changes in mobility and threshold voltage.

[0003] Therefore, temperature will affect the characteristics of flexible OLED TFT, causing product current and brightness attenuation, and chromaticity change. The problem will be more prominent in medium-size OLEDs with high heat generation. In the camera under panel (CUP) product, the TFT design in the CUP area is inconsistent with that in the normal area, and one TFT drives multiple OLED devices. Under the influence of temperature, the brightness attenuation in the normal area is greater, thereby causing a brightness difference between the CUP and the normal area after being used for a period of time. SUMMARY

[0004] The present disclosure provides a screen compensation circuit, a method, an electronic device, a storage medium and a computer program product.

[0005] According to a first aspect of the present disclosure, a screen compensation circuit is provided, comprising a detection module, a first capacitor module, a second capacitor module and a driving module.

[0006] A first end of the first capacitor module is connected to a first node, and a second end of the first capacitor is connected to a second node;

[0007] A control end of the detection module is connected to a second scan signal line, an input end of the detection module is connected to a detection signal line, and an output end of the detection module is connected to the first node;

[0008] A control end of the driving module is connected to the second node, an input end of the driving module is connected to the first node, and an output end of the driving module is grounded.

[0009] One end of the second capacitor is connected to the input end of the detection module through the detection signal line.

[0010] Optionally, the circuit further comprises a first initialization module and a second initialization module.

[0011] The control end of the first initialization module is connected to the first scan signal line, the input end of the first initialization module is connected to a constant high voltage, and the output end of the first initialization module is connected to the first node.

[0012] The control end of the second initialization module is connected to the first scan signal line, the input end of the second initialization module is connected to the second node, and the output end of the second initialization module is connected to the data signal line.

[0013] Optionally, the first initialization module comprises a first transistor, the gate of the first transistor is connected to the first scan signal line, the source of the first transistor is connected to the constant high voltage, and the drain of the first transistor is connected to the first node.

[0014] Optionally, the second initialization module comprises a second transistor, the gate of the second transistor is connected to the first scan signal line, the source of the second transistor is connected to the second node, and the drain of the second transistor is connected to the data signal line.

[0015] Optionally, the detection module comprises a third transistor, the gate of the third transistor is connected to the second scan signal line, the source of the third transistor is connected to the detection signal line, and the drain of the third transistor is connected to the first node.

[0016] Optionally, the driving module comprises a fourth transistor, the gate of the fourth transistor is connected to the second node, the source of the fourth transistor is connected to the first node, and the drain of the fourth transistor is grounded.

[0017] According to a second aspect of the present disclosure, a screen compensation method is provided for driving the screen compensation circuit according to any one of the above-mentioned first aspect, comprising:

[0018] In the detection stage, the first scan signal line outputs a high voltage, the second scan signal line outputs a low voltage, so that the detection module and the driving module are turned on, and the detection potential of the first node is obtained.

[0019] In the compensation stage, the compensation data amount is obtained according to the detection potential, and the pixel driving circuit is compensated according to the compensation data amount.

[0020] Optionally, the method further comprises:

[0021] In the reset stage, the first scan signal line outputs a low potential, the second scan signal line outputs a high potential, the first initialization module and the second initialization module are turned on, the detection module and the driving module are turned off, the potential of the first node is reset to the constant high potential, and the potential of the second node is reset to the output potential of the data signal line.

[0022] Optionally, the obtaining of the compensation data amount according to the detection potential comprises:

[0023] The first node potential change amount is obtained according to the detection potential and the constant high potential, and the data compensation amount is obtained according to the first node potential change amount.

[0024] Optionally, the obtaining of the data compensation amount according to the first node potential change amount comprises:

[0025] The threshold voltage of the driving module is obtained according to the first node potential change amount, the output potential of the data signal line, the constant high potential, and the capacitance of the second capacitance module, and the compensation data amount is obtained according to the threshold voltage.

[0026] Optionally, the threshold voltage of the driving module is obtained according to the following formula:

[0027] Wherein, t is the duration of the detection stage, C cp is the capacitance of the second capacitance module, V th is the threshold voltage of the driving module, V int is the potential value of the constant high potential, V1 is the detection potential, and K is a driving module parameter, wherein the formula of K is Wherein, u is the mobility, W is the width of the driving module, and L is the length of the driving module.

[0028] According to a third aspect of the present disclosure, an electronic device is provided, comprising:

[0029] at least one processor; and

[0030] a memory in communication with the at least one processor; wherein

[0031] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of the first aspect.

[0032] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, wherein the computer instructions are used to cause the computer to perform the method according to any one of the first aspect.

[0033] According to a fifth aspect of the present disclosure, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the method according to any one of the first aspect 9.

[0034] The scheme of the present disclosure has the following beneficial effects:

[0035] After the reset and detection, the compensation data amount is obtained according to the detection potential, and the pixel driving circuit is compensated, which can reduce the brightness difference of different areas of the screen caused by temperature rise, and improve the screen display effect.

[0036] The compensation is performed on each area of the screen respectively, and the different areas are compensated more accurately, thereby improving the screen display effect.

[0037] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present disclosure, nor to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are used to better understand the present scheme and do not limit the present disclosure. Among them:

[0039] Figure 1 is a schematic diagram of the brightness difference of the screen without compensation.

[0040] Figure 2 is a structural schematic diagram of a screen compensation circuit according to an embodiment of the present disclosure;

[0041] Figure 3 is a structural schematic diagram of a screen compensation circuit according to an embodiment of the present disclosure;

[0042] Figure 4 is a flowchart of a screen compensation method according to an embodiment of the present disclosure;

[0043] Figure 5 is a schematic diagram of the brightness difference of the screen after compensation.

[0044] Figure 6 is a scanning signal line potential diagram provided by an embodiment of the present application.

[0045] Figure 7 is a potential-data compensation amount relationship diagram provided by an embodiment of the present application.

[0046] Figure 8 is a temperature-potential relationship diagram provided by an embodiment of the present application.

[0047] Figure 9 is a screen compensation circuit setting diagram provided by an embodiment of the present application.

[0048] Figure 10 is a block diagram of an electronic device for implementing the screen compensation method of the embodiments of the present disclosure. DETAILED DESCRIPTION

[0049] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, which include various details of the embodiments of the present disclosure to assist in understanding, which should be considered in a descriptive sense only. Thus, it will be apparent to one of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Also, for the sake of brevity and clarity, descriptions of well-known functions and constructions are omitted from the following description.

[0050] An organic light-emitting diode (OLED) screen has the characteristics of wide color gamut, high contrast, and flexible bending, and gradually becomes a standard configuration of high-end mobile phones. In recent years, OLED has moved from rigid glass substrates to polyimide film (PI) flexible substrate products, and PI film has also made new breakthroughs in large size and under-screen camera schemes. Since the PI substrate has poor heat dissipation, and there are some unbound and freely movable groups at the interface between PI and inorganic film layers, under a front electric field, the groups will form aggregation and diffusion. This will cause redistribution of the parasitic capacitance of the thin film transistor (TFT) back channel, and the temperature will accelerate the movement of the above groups, causing the electrical property of the TFT to shift after the parasitic capacitance changes. And low-temperature polysilicon is very sensitive to temperature, which will cause changes in mobility and threshold voltage.

[0051] Therefore, temperature will affect the characteristics of flexible OLED TFT, causing product current and brightness attenuation, and chromaticity change. The problem will be more prominent in medium-sized OLEDs with high heat generation. The under-screen camera product has inconsistent TFT design in the CUP area and the normal area, and is driven by one TFT for multiple OLED devices. Under the influence of temperature, the brightness attenuation of the normal area is greater, thereby causing the brightness difference between the CUP and the normal area after a period of use.

[0052] Figure 1 is a schematic diagram of the brightness difference of the screen without compensation. As shown in Figure 1 , after the under-screen camera module is used for a period of time, the brightness at the CUP position will be brighter than that in the normal area, and it will take about 30 minutes from the initial state to the saturation of the brightness difference. With the passage of time, Figure 1The luminance difference between the central circular area, i.e. the CUP area, and the surrounding area (normal area) is getting larger and larger. This is because the PI charges of the flexible screen PI substrate will move to the back of the TFT under the action of the electric field, form a parasitic electric field and cause the TFT characteristic to deviate, and since the TFT at the CUP position is a 1-to-3 design driving current, which is about 3 times larger than that of the normal area, there is a difference in the TFT working interval between the normal area and the CUP position. As the temperature of the point screen increases, the characteristic difference will be amplified.

[0053] In the related art, there are two solutions. The first solution is to use an internal compensation circuit to compensate for the TFT characteristic deviation. Since the internal compensation circuit cannot completely compensate for the electrical changes, there is still a difference in luminance between the heating area and the normal temperature area. The second solution is to collect the luminance decay law of the panel at different temperatures, and make a 2D lookup table of the corresponding relationship between the temperature and the data compensation amount, so as to compensate for the luminance decay caused by the temperature change. Since this is an external compensation, and the decay law is greatly different due to the individual characteristics of the panel, it is difficult to take into account the decay characteristics of a wide range of panels, and a compensation solution that is accurate and takes into account individual dispersion is needed.

[0054] Figure 2 FIG. 1 is a structural schematic diagram of a screen compensation circuit according to an embodiment of the present disclosure, as shown in FIG. 1, the screen compensation circuit comprises: Figure 2

[0055] a detection module 230, a first capacitor module 240, a second capacitor module 250, and a driving module 260;

[0056] In the embodiment of the present disclosure, there are a plurality of TFTs under the screen to drive the corresponding OLED to emit light, and the screen compensation circuit is used to detect the temperature of the TFT in a certain range of the screen and the corresponding data compensation amount. The screen compensation circuit will consume the battery power during operation and generate a certain amount of heat. In order to save energy and reduce the heat generation of the screen, it is not necessary to configure a corresponding screen compensation circuit for each TFT. The screen is divided into a plurality of square detection areas with equal areas, and a screen compensation circuit is arranged at the lower right corner of each square detection area. One screen compensation circuit is used to detect the square detection area to which it belongs.

[0057] Figure 9 FIG. 2 is a screen compensation circuit setting diagram according to an embodiment of the present disclosure. As shown in FIG. 2, in a possible embodiment, the screen is divided into a plurality of square detection areas with equal areas, and a screen compensation circuit is arranged at the lower right corner of each square detection area. One screen compensation circuit is used to detect the square detection area to which it belongs. Figure 9

[0058] One end of the first capacitor module is connected to the first node, and the other end of the first capacitor is connected to the second node. ​​

[0059] In the embodiment of the present disclosure, the first capacitor module is used for storing electric energy, when the first initialization module and the second initialization module are turned on, the driving module is equivalent to a resistor, and the driving module is connected in parallel with the first capacitor module, so that the first capacitor module has a certain potential difference between both ends, that is, a voltage.

[0060] The control end of the detection module is connected with the second scan signal line, the input end of the detection module is connected with a detection signal line senseline, and the output end of the detection module is connected with the first node.

[0061] In the embodiment of the present disclosure, the detection module is used for detecting the potential change of the first node, after the second scan signal line controls the detection module to be turned on for a period of time, the potential of the first node changes, the potential change amount of the first node is related to the temperature of the screen compensation circuit, the temperature of the screen compensation circuit can be obtained according to the potential change amount, and further the compensation data amount required by the TFT in the corresponding area can be obtained.

[0062] The control end of the driving module is connected with the second node, the input end of the driving module is connected with the first node, and the output end of the driving module is grounded, that is, ELVSS in the figure.

[0063] In the embodiment of the present disclosure, when the first initialization module and the second initialization module are in the turned-on state, the driving module has a certain impedance, and the driving module is used for blocking current and can be equivalent to a resistor.

[0064] When the detection module is in the turned-on state, the driving module has a certain impedance, and the driving module is used for blocking current and can be equivalent to a resistor. At different temperatures, the impedance of the detection module is different, the strength of the current blocking is different, the potential change amount of the first node is different, the threshold voltage of the detection module can be obtained according to the potential change amount, and further the temperature can be obtained.

[0065] One end of the second capacitor is connected with the input end of the detection module through the detection signal line.

[0066] In the embodiment of the present disclosure, after the second scan signal line controls the detection module to be turned on for a period of time, the electric energy in the second capacitor is released, the first capacitor is charged, the potential of the first node and the second node changes, and the potential change amount is related to the impedance of the driving module. The higher the temperature is, the greater the impedance is.

[0067] Optionally, the circuit further comprises a first initialization module 210 and a second initialization module 220. A control end of the first initialization module is connected to a first scan signal line, an input end of the first initialization module is connected to a constant high voltage, and an output end of the first initialization module is connected to a first node.

[0068] In the embodiment of the present disclosure, the first initialization module is configured to reset the first node, i.e., to fix the potential of the first node as the potential of the constant high voltage. When the first scan signal line controls the first initialization module to be turned on and after a period of time, the potential of the first node is equal to the potential of the constant high voltage.

[0069] A control end of the second initialization module is connected to the first scan signal line, an input end of the second initialization module is connected to a second node, and an output end of the second initialization module is connected to a data signal line dataline.

[0070] In the embodiment of the present disclosure, the first initialization module is configured to reset the second node, i.e., to fix the potential of the second node as the potential of the data signal line. When the first scan signal line controls the second initialization module to be turned on and after a period of time, the potential of the second node is equal to the potential of the data signal line.

[0071] After the screen compensation circuit is reset and detected, the embodiment of the present disclosure can obtain compensation data according to the detected potential and compensate the pixel driving circuit. The embodiment of the present disclosure can reduce the brightness difference of different regions of the screen caused by temperature rise and improve the display effect of the screen.

[0072] Optionally, the first initialization module comprises a first transistor, a gate of the first transistor is connected to the first scan signal line, a source of the first transistor is connected to the constant high voltage, and a drain of the first transistor is connected to the first node.

[0073] The first transistor is a thin film transistor, which is an insulated gate field effect transistor, and includes a gate, a source and a drain. When a positive voltage is applied to the gate, an electric field is generated in the gate insulating layer, and the electric lines of force point from the gate electrode to the semiconductor surface, and an induced charge is generated at the surface. As the gate voltage increases, the semiconductor surface will change from a depletion layer to an electron accumulation layer, forming an inversion layer. When strong inversion is reached (i.e., when the threshold voltage is reached), a voltage applied between the source and the drain will cause carriers to pass through the channel. When the voltage between the source and the drain is small, the conductive channel is approximately a constant resistance, and the drain current increases linearly with the increase of the source-drain voltage. When the voltage between the source and the drain is large, it will affect the gate voltage, so that the electric field in the gate insulating layer gradually weakens from the source end to the drain end, and the electrons in the inversion layer of the semiconductor surface gradually decrease from the source end to the drain end, and the channel resistance increases with the increase of the source-drain voltage. The increase of the drain current becomes slow, and the linear region transitions to the saturation region. When the voltage between the source and the drain increases to a certain extent, the thickness of the inversion layer at the drain end decreases to zero, and when the voltage continues to increase, the transistor enters the saturation region.

[0074] When the input potential of the first scan signal line is lower than the threshold voltage of the first transistor, the first transistor is turned on, and current can pass between the source and the drain thereof, and at this time the first transistor can be equivalent to a closed switch. When the first scan signal line inputs a higher potential, the first transistor is turned off, and current cannot pass between the source and the drain thereof, and at this time the first transistor can be equivalent to an open switch.

[0075] Optionally, the second initialization module includes a second transistor, the gate of the second transistor is connected with the first scan signal line, the source of the second transistor is connected with the second node, and the drain of the second transistor is connected with the data signal line.

[0076] When the input potential of the first scan signal line is lower than the threshold voltage of the second transistor, the second transistor is turned on, and current can pass between the source and the drain thereof, and at this time the second transistor can be equivalent to a closed switch. When the first scan signal line inputs a higher potential, the second transistor is turned off, and current cannot pass between the source and the drain thereof, and at this time the second transistor can be equivalent to an open switch.

[0077] Optionally, the detection module includes a third transistor, the gate of the third transistor is connected with the second scan signal line, the source of the third transistor is connected with the detection signal line, and the drain of the third transistor is connected with the first node.

[0078] When the input potential of the second scan signal line is lower than the threshold voltage of the third transistor, the third transistor is turned on, and current can pass between the source and the drain of the third transistor, and the third transistor can be equivalent to a closed switch.

[0079] Optionally, the driving module comprises a fourth transistor, a gate of the fourth transistor is connected with the second node, a source of the fourth transistor is connected with the first node, and a drain of the fourth transistor is grounded.

[0080] When the input potential of the second scan signal line is lower than the threshold voltage of the fourth transistor, the fourth transistor is turned on, and current can pass between the source and the drain of the fourth transistor, and the fourth transistor can be equivalent to a closed switch. When the input potential of the second scan signal line is higher, the fourth transistor is turned off, and current cannot pass between the source and the drain of the fourth transistor, and the fourth transistor can be equivalent to an open switch.

[0081] Figure 3 A structure diagram of a screen compensation circuit is provided according to an embodiment of the present disclosure, as shown in the figure, the screen compensation circuit comprises a first transistor 310, a second transistor 320, a third transistor 330, a first capacitor module 340, a second capacitor module 350 and a fourth transistor 360. Figure 3

[0082] A control end of the first transistor 310 is connected with a first scan signal line, a gate of the first transistor is connected with the first scan signal line, a source of the first transistor is connected with a constant high potential, and a drain of the first transistor is connected with a first node.

[0083] A gate of the second transistor 320 is connected with the first scan signal line, a source of the second transistor is connected with the second node, and a drain of the second transistor is connected with a data signal line.

[0084] One end of the first capacitor module 340 is connected with the first node, and the other end of the first capacitor is connected with the second node.

[0085] A gate of the third transistor 330 is connected with a second scan signal line, a source of the third transistor is connected with a detection signal line, and a drain of the third transistor is connected with the first node.

[0086] A gate of the fourth transistor 360 is connected with the second node, a source of the fourth transistor is connected with the first node, and a drain of the fourth transistor is grounded.​

[0087] One end of the second capacitor 350 is connected to the input end of the detection module through the detection signal line.

[0088] Figure 4 is a flowchart of a screen compensation method according to an embodiment of the present disclosure. As shown in Figure 4 the method is used for controlling the screen compensation circuit, and the method comprises the following steps of:

[0089] In the reset phase, in order to reset the potential of the first node to be the same as the constant high potential and reset the potential of the second node to be the same as the potential of the data signal line, the first transistor and the second transistor need to be in the on state.

[0090] Figure 6 is a scanning signal line potential diagram provided by an embodiment of the present disclosure. As shown in Figure 6 in the reset phase, the first scanning signal line SCAN(1) outputs a low potential to make the first transistor and the second transistor in the on state, and the second scanning signal line SCAN(2) outputs a high potential to make the third transistor in the off state.

[0091] Step 401, detection phase, make the first scanning signal line output a high potential, and make the second scanning signal line output a low potential, so as to make the detection module and the driving module in the on state, and obtain the detection potential of the first node;

[0092] In the embodiment of the present disclosure, as shown in Figure 6 in the detection phase, the first scanning signal line SCAN(1) outputs a high potential to make the first transistor and the second transistor in the off state, and the second scanning signal line SCAN(2) outputs a low potential to make the third transistor in the on state. The second capacitor module is connected to the first node, and the potential of the first node changes. After the detection phase is completed, the SCAN(1) and the SCAN(2) both output a high potential to make the first transistor, the second transistor and the third transistor in the off state. At this time, the potential of the first node, i.e. the detection potential, is obtained.

[0093] Step 402, compensation phase, obtain compensation data according to the detection potential, and compensate the pixel driving circuit according to the compensation data.

[0094] In the embodiment of the present disclosure, after the reset phase, the potential of the first node is equal to the constant high potential. After the detection potential is obtained, the potential difference between the detection potential and the constant high potential is calculated. According to the elements and structures in the screen compensation circuit, the threshold voltage of the fourth transistor can be calculated, and the temperature and the corresponding compensation data can be further calculated.

[0095] The embodiment of the present disclosure can reset and detect the screen compensation circuit, obtain compensation data according to the detection potential, and compensate the pixel driving circuit. The embodiment of the present disclosure can reduce the brightness difference of different areas of the screen caused by temperature rise, and improve the display effect of the screen.

[0096] Optionally, before the detection stage of the method, the method further comprises:

[0097] In the reset stage, a low potential is input to the first scan signal line, and a high potential is input to the second scan signal line, so as to reset the potential of the first node.

[0098] In the embodiment of the present disclosure, the screen compensation circuit is controlled by the first scan signal line and the second scan signal line. The transistor in the screen compensation circuit can enter the conducting or closed state after a certain signal is input to the scan signal line. In the conducting state, the transistor can be equivalent to a wire; in the closed state, the transistor can be equivalent to an open switch. The state of the first transistor and the second transistor is controlled by the first scan signal line, and the state of the third transistor is controlled by the second scan signal line.

[0099] Optionally, the method further comprises:

[0100] According to the detection potential and the constant high potential, the first node potential change amount is obtained, and the data compensation amount is obtained according to the first node potential change amount.

[0101] In the embodiment of the present disclosure, the first node potential change amount is δv, and the formula of δv is δv=V int -V1, wherein V int is the potential of the constant high potential, and V1 is the detection potential.

[0102] In the reset stage, there is only a wire between the first node and the constant high potential, so after the reset stage ends, the potential of the first node is the same as the potential of the constant high potential, that is, the potential of the first node is V int . After the detection stage ends, the potential of the first node changes relative to V int , and the change amount is related to the temperature. The potential change amount is δv=V int -V1.

[0103] Optionally, the method further comprises: obtaining the threshold voltage of the driving module according to the first node potential variation, the output potential of the data signal line, the constant high potential, and the capacitance of the second capacitance module, and obtaining the compensation data quantity according to the threshold voltage. In the embodiment of the present disclosure, the threshold voltage Vth of the driving module is solved according to the above formula th and the statistical Vth th The temperature and the data compensation quantity are obtained according to the relationship data of the temperature. Figure 7 is a potential-data compensation quantity relationship diagram provided by the embodiment of the present disclosure. Figure 8 is a temperature-potential relationship diagram provided by the embodiment of the present disclosure. As shown in Figure 7 and Figure 8 When the temperature increases, the mobility mob will decrease and the Vth will be positive. For PMOS, the influence of Vth on the current is dominant. Due to the characteristic of the capacitance maintaining voltage, the potential difference between the first node and the second node is constant in the detection stage. Finally, the potential of the first node (detection potential) is only related to mob and Vth, and the higher the temperature is, the more negative the potential of the first node is (the potential of ELVSS is more negative than Vint), and thus the greater the compensation data quantity is. By establishing the relationship among the temperature, the Q point potential, and the compensation quantity, the characteristics of different screens / different positions can be accurately compensated. The TFT driving OLED pixel light emission is compensated according to the compensation data quantity, and the present disclosure does not limit the compensation method.

[0104] K is a parameter of the driving module, and the formulaic expression of K is wherein u is the mobility, W is the width of the driving module, and L is the length of the driving module W / L is the width-length ratio of the driving module.

[0105] In the embodiment of the present disclosure, K is obtained according to the above formula, and K is used for subsequent calculation of the threshold voltage of the driving module.

[0106] In the embodiment of the present disclosure, the δv is related to the threshold voltage of the driving module, and the threshold voltage is related to the temperature of the environment in which the first transistor is located. Therefore, the temperature of the driving module and the data compensation quantity can be obtained according to the δv.

[0107] Optionally, the formulaic expression for obtaining the threshold voltage of the driving module is: wherein t is the duration of the detection stage, C cp is the capacitance of the second capacitance module, V th is the threshold voltage of the driving module, V int is the potential value of the constant high potential, V1 is the detection potential,

[0108] Figure 5 is a schematic diagram of the brightness difference of the screen after compensation. As shown in Figure 5 the screen after compensation by the embodiment of the present disclosure, the brightness difference between different areas on the screen is significantly reduced, effectively improving the display effect of the screen.

[0109] According to the embodiments of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium and a computer program product.

[0110] Figure 10 A schematic block diagram of an example electronic device 1000 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices, and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit implementations of the present disclosure described and / or claimed in this document.

[0111] As shown in Figure 10 , the device 1000 includes a computing unit 1001 that can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 1002 or a computer program loaded into a random access memory (RAM) 1003 from a storage unit 1008. In the RAM 1003, various programs and data required for the operation of the device 1000 can also be stored. The computing unit 1001, the ROM 1002, and the RAM 1003 are connected to each other through a bus 1004. An input / output (I / O) interface 1005 is also connected to the bus 1004.

[0112] Various components in the device 1000 are connected to the I / O interface 1005, including: an input unit 1006, such as a keyboard, a mouse, etc.; an output unit 1007, such as various types of displays, speakers, etc.; a storage unit 1008, such as a magnetic disk, an optical disk, etc.; and a communication unit 1009, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 1009 allows the device 1000 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunications networks.

[0113] The computing unit 1001 can be various general purpose and / or special purpose processing components having processing and computing capabilities. Some examples of the computing unit 1001 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 1001 performs various methods and processes described above, such as the method of screen compensation. For example, in some embodiments, the method of screen compensation can be implemented as a computer software program tangibly embodied in a machine-readable medium, such as the storage unit 1008. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 1000 via the ROM 1002 and / or the communication unit 1009. When the computer program is loaded onto the RAM 1003 and executed by the computing unit 1001, one or more steps of the method of screen compensation described above can be performed. Alternatively, in other embodiments, the computing unit 1001 can be configured to perform the method of screen compensation by any other suitable means, such as by means of firmware.

[0114] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0115] Program code for carrying out methods of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the program code, when executed by the processor or controller, produces a means for implementing the functions / acts specified in the flowcharts and / or block diagrams. The program code can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0116] In the context of this disclosure, a machine-readable medium can be a tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0117] To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0118] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), the Internet, and a blockchain network.

[0119] The computer system can include clients and servers. This relationship can be. The servers are generally remote from the users and can be accessed via the Internet using a communication network. The relationship can be a client-server relationship over a communications network, and as such, the servers can be accessed by the clients using computer programs. The servers can be cloud servers, also known as cloud computing servers or cloud hosts, which are mainframe products in the cloud computing service system, and solve the defects of large management difficulty and weak business scalability in traditional physical hosts and VPS services ("Virtual Private Server", or simply "VPS").

[0120] It should be understood that the various forms of flow shown above can be reordered, added to, or have steps deleted. For example, the steps described in the present disclosure can be performed in parallel, in series, or in a different order, as long as the desired results of the technical solutions of the present disclosure can be achieved, and the present disclosure is not limited herein.

[0121] The above detailed description does not constitute a limitation on the protection scope of the present disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A screen compensation circuit, characterized by, The circuit comprises: a detection module, a first capacitance module, a second capacitance module and a driving module; a first end of the first capacitance module is connected with a first node, and a second end of the first capacitance is connected with a second node; a control end of the detection module is connected with a second scan signal line, an input end of the detection module is connected with a detection signal line, and an output end of the detection module is connected with the first node, the detection module is used for detecting a potential change of the first node, and the potential change of the first node is related to a temperature of the screen compensation circuit; a control end of the driving module is connected with the second node, an input end of the driving module is connected with the first node, and an output end of the driving module is grounded; one end of the second capacitance is connected with the input end of the detection module through the detection signal line; the circuit further comprises a first initialization module and a second initialization module; a control end of the first initialization module is connected with a first scan signal line, an input end of the first initialization module is connected with a constant high voltage, and an output end of the first initialization module is connected with the first node; a control end of the second initialization module is connected with the first scan signal line, an input end of the second initialization module is connected with the second node, and an output end of the second initialization module is connected with a data signal line.

2. The circuit of claim 1, wherein, the first initialization module comprises a first transistor, a gate of the first transistor is connected with the first scan signal line, a source of the first transistor is connected with the constant high voltage, and a drain of the first transistor is connected with the first node.

3. The circuit of claim 1, wherein, the second initialization module comprises a second transistor, a gate of the second transistor is connected with the first scan signal line, a source of the second transistor is connected with the second node, and a drain of the second transistor is connected with the data signal line.

4. The circuit of claim 1, wherein, the detection module comprises a third transistor, a gate of the third transistor is connected with the second scan signal line, a source of the third transistor is connected with the detection signal line, and a drain of the third transistor is connected with the first node.

5. The circuit of claim 1, wherein, the driving module comprises a fourth transistor, a gate of the fourth transistor is connected with the second node, a source of the fourth transistor is connected with the first node, and a drain of the fourth transistor is grounded.

6. A method of screen compensation, characterized by, a method for driving the screen compensation circuit as claimed in any one of claims 1-4, comprising: a detection stage, in which a high voltage is output by the first scan signal line, a low voltage is output by the second scan signal line, the detection module and the driving module are turned on, and a detection potential of the first node is obtained; a compensation stage, in which compensation data is obtained according to the detection potential, and a pixel driving circuit is compensated according to the compensation data.

7. The method of claim 6, wherein, further comprising: a reset stage, in which a low voltage is output by the first scan signal line, a high voltage is output by the second scan signal line, the first initialization module and the second initialization module are turned on, and the detection module and the driving module are turned off, so that the potential of the first node is reset to the constant high voltage, and the potential of the second node is reset to the output potential of the data signal line.

8. The method of claim 6, wherein, the compensation data obtained according to the detection potential comprises: According to the detection potential and the constant high potential, a first node potential variation is obtained, and according to the first node potential variation, the compensation data quantity is obtained.

9. The method of claim 8, wherein, The obtaining of the compensation data quantity according to the first node potential variation comprises: According to the first node potential variation, an output potential of the data signal line, the constant high potential, and a capacitance of the second capacitance module, a threshold voltage of the driving module is obtained, and according to the threshold voltage, the compensation data quantity is obtained.

10. The method of claim 9, wherein, The formulaic expression for obtaining the threshold voltage of the driving module is: wherein t is the time duration of the detection phase, C cp is the capacitance of the second capacitive module, V th is the threshold voltage of the driving module, V int is the potential value of the constant high potential, V1 is the detection potential, and K is a driving module parameter, wherein the formulaic expression of K is wherein u is the mobility, W is the width of the driving module, and L is the length of the driving module.

11. An electronic device, comprising: comprises: at least one processor; and a memory in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 6-10.

12. A non-transitory computer-readable storage medium having stored thereon computer instructions, wherein, The computer instructions are used to enable the computer to perform the method of any one of claims 6-10.

13. A computer program product comprising a computer program which, when executed by a processor, implements the method of any one of claims 6-10.

Images