Brightness compensation circuit, brightness compensation method and display panel

Abstract

The embodiment of the invention discloses a brightness compensation circuit, a brightness compensation method and a display panel, and belongs to the technical field of display. The brightness compensation circuit comprises an ambient light detection module, a time sequence control module and a data driving module which are connected in sequence, the ambient light detection module is used for detecting ambient light intensity, converting the ambient light intensity into ambient light intensity information and transmitting the ambient light intensity information to the time sequence control module; the time sequence control module is used for receiving an image display signal, determining an initial control signal according to the image display signal, determining a weight parameter according to ambient light intensity information and preset contrast information, and performing coupling operation based on the initial control signal and the weight parameter to obtain a light-emitting control signal. The light-emitting control signal is output to the data driving module and the in-plane display area; the data driving module is used for adjusting data voltage according to the light-emitting control signal and outputting the data voltage to the in-plane display area. According to the embodiment of the invention, brightness compensation can be realized without improving an in-plane process.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular to a brightness compensation circuit, a brightness compensation method and a display panel. Background Art

[0002] With the vigorous development of display technology, high color gamut has become an important development direction. In order to improve the display effect of display devices, a technology of setting a QD (quantum dot) layer on an OLED (Organic Light-Emitting Diode) display device can be used to achieve the effect of improving the viewing angle and color gamut.

[0003] However, due to the introduction of QD display technology, the display panel is greatly affected by ambient light, so it is necessary to add circular polarizers and color film layers to shield the ambient light. However, this will cause the intensity of the QD-OLED's outgoing light to weaken, making the actual display brightness lower than the ideal brightness. Therefore, brightness compensation of QD-OLED is also required.

[0004] At present, the main means of brightness compensation for QD-OLED is to change the mixing method of the OLED light source in the process and improve the process section, but these methods are all in-plane process improvements, which are costly and complex, have low replaceability and adjustability, and are not convenient for evaluating whether the performance meets the standards. Summary of the invention

[0005] The main purpose of the embodiments of the present application is to provide a brightness compensation circuit, a brightness compensation method and a display panel, aiming to solve the technical problem of how to achieve brightness compensation without improving the in-plane process.

[0006] To achieve the above object, an embodiment of the present application provides a brightness compensation circuit, the brightness compensation circuit comprising: an ambient light detection module, a timing control module and a data driving module connected in sequence;

[0007] The ambient light detection module is used to detect the ambient light intensity, convert the ambient light intensity into ambient light intensity information and transmit it to the timing control module;

[0008] The timing control module is used to receive an image display signal, determine an initial control signal according to the image display signal, determine a weight parameter according to the ambient light intensity information and the preset comparison information, perform a coupling operation based on the initial control signal and the weight parameter to obtain a light emitting control signal, and output the light emitting control signal to the data driving module and the in-plane display area;

[0009] The data driving module is used to generate a corresponding data voltage according to a change of the light emitting control signal, and output the data voltage to the in-plane display area.

[0010] In one embodiment, the ambient light detection module includes:

[0011] A photodiode, wherein the anode of the photodiode is connected to a DC power supply, and the photodiode is used to convert the ambient light intensity into a photocurrent;

[0012] An analog-to-digital converter, wherein the input end of the analog-to-digital converter is connected to the cathode of the photodiode, the output end of the analog-to-digital converter is connected to the timing control module, and the analog-to-digital converter is used to convert the photocurrent into the ambient light intensity information and transmit it to the timing control module.

[0013] In one embodiment, the data driving module includes:

[0014] A push-pull unit, wherein an input end of the push-pull unit is connected to the light-emitting control signal, a first polarity end of the push-pull unit is connected to a power supply voltage, a second polarity end of the push-pull unit is grounded, and the push-pull unit is used to pull up the voltage of the light-emitting control signal to obtain a digital control voltage;

[0015] A filter unit, wherein an input end of the filter unit is connected to an output end of the push-pull unit, a ground end of the filter unit is grounded, and the filter unit is used to perform digital-to-analog conversion on the digital control voltage to obtain an analog control voltage;

[0016] a voltage regulating unit, wherein a controlled end of the voltage regulating unit is connected to an output end of the filtering unit, a first end of the voltage regulating unit is grounded, and an on / off state of the voltage regulating unit is determined based on the analog control voltage;

[0017] A voltage conversion unit, wherein a first input terminal of the voltage conversion unit is connected to an input voltage, a second input terminal of the voltage conversion unit is grounded, a feedback terminal of the voltage conversion unit is connected to a second terminal of the voltage regulating unit, an output terminal of the voltage conversion unit is connected to the in-plane display area, and the voltage conversion unit is used to convert the input voltage and a gain multiple to obtain the data voltage; wherein the gain multiple changes with the on-off state of the voltage regulating unit.

[0018] In one embodiment, the push-pull unit comprises:

[0019] An N-type transistor, wherein the base of the N-type transistor is connected to the light-emitting control signal, the collector of the N-type transistor is connected to the power supply voltage, and the emitter of the N-type transistor is connected to the input end of the filtering unit;

[0020] A P-type transistor, wherein the base of the P-type transistor is connected to the light-emitting control signal, the collector of the P-type transistor is grounded, and the emitter of the P-type transistor is connected to the input end of the filtering unit.

[0021] In one embodiment, the filtering unit comprises:

[0022] A first capacitor, wherein a first end of the first capacitor is connected to the output end of the push-pull unit, and a second end of the first capacitor is grounded;

[0023] A first resistor, wherein a first end of the first resistor is connected to an output end of the push-pull unit.

[0024] In one embodiment, the voltage regulating unit includes:

[0025] a transistor, wherein a gate of the transistor is connected to an output terminal of the filtering unit, a first terminal of the transistor is connected to a feedback terminal of the voltage conversion unit, and an on-off state of the transistor is determined based on the analog control voltage;

[0026] A second resistor, wherein a first end of the second resistor is connected to the second end of the transistor, and a second end of the second resistor is grounded.

[0027] In one embodiment, the voltage conversion unit includes:

[0028] a third resistor, a first end of the third resistor being connected to the input voltage;

[0029] A fourth resistor, a first end of the fourth resistor is grounded;

[0030] a fifth resistor, wherein a first end of the fifth resistor is connected to a second end of the third resistor, and a second end of the fifth resistor is connected to a second end of the voltage regulating unit;

[0031] a sixth resistor, a first end of the sixth resistor being connected to the second end of the fifth resistor;

[0032] An operational amplifier, wherein the inverting input terminal of the operational amplifier is connected to the second end of the third resistor, the non-inverting input terminal of the operational amplifier is connected to the second end of the fourth resistor, and the output terminal of the operational amplifier is connected to the second end of the sixth resistor and the in-plane display area.

[0033] In one embodiment, the brightness compensation circuit further includes:

[0034] A connector, the connector being connected to the timing control module and the signal input source respectively, and the connector being used to transmit the image display signal from the signal input source to the timing control module;

[0035] A memory, wherein the memory is connected to the timing control module, and the memory is used to pre-store the preset comparison information for the timing control module to call.

[0036] In addition, to achieve the above purpose, an embodiment of the present application further provides a brightness compensation method, which is applied to the brightness compensation circuit as described above, and includes:

[0037] Detecting ambient light intensity, converting the ambient light intensity into ambient light intensity information, and determining a weight parameter according to the ambient light intensity information and preset comparison information;

[0038] receiving an image display signal, and determining an initial control signal according to the image display signal;

[0039] Performing a coupling operation based on the initial control signal and the weight parameter to obtain a light emitting control signal, and outputting the light emitting control signal to an in-plane display area;

[0040] A corresponding data voltage is generated according to a change of a light emitting control signal, and the data voltage is output to the in-plane display area.

[0041] In addition, to achieve the above-mentioned purpose, an embodiment of the present application further provides a display panel, wherein the display panel includes the brightness compensation circuit as described above.

[0042] The embodiment of the present application proposes a brightness compensation circuit, a brightness compensation method and a display panel. The brightness compensation circuit includes: an ambient light detection module, a timing control module and a data driving module connected in sequence; the ambient light detection module is used to detect the ambient light intensity, convert the ambient light intensity into ambient light intensity information and transmit it to the timing control module; the timing control module is used to receive an image display signal, determine an initial control signal according to the image display signal, determine a weight parameter according to the ambient light intensity information and preset control information, perform a coupling operation based on the initial control signal and the weight parameter to obtain a light-emitting control signal, and output the light-emitting control signal to the data driving module and the in-plane display area; the data driving module is used to adjust the data voltage according to the light-emitting control signal, and output the data voltage to the in-plane display area.

[0043] The embodiment of the present application acquires ambient light intensity information by adding an ambient light detection module in the non-display area, determines weight parameters in combination with the ambient light intensity information and preset control information, and performs coupling operation on the initial control signal originally generated by the timing control module based only on the image display signal based on the weight parameters, thereby obtaining a light emitting control signal that takes into account the influence of ambient light. At the same time, the data driving module for generating the data voltage is improved in combination with the light emitting control signal, so that the size of the data voltage can be changed by the light emitting control signal, thereby realizing brightness compensation for the in-plane display area by controlling a single variable. In addition, compared with the in-plane process improvement method, the brightness compensation circuit has lower cost and complexity, higher replaceability and adjustability, and is easier to evaluate whether various parameters meet the performance standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a brightness compensation circuit provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of the structure of an ambient light detection module in a brightness compensation circuit provided in an embodiment of the present application;

[0047] Figure 3 A schematic diagram of the structure of a data driving module in a brightness compensation circuit provided in an embodiment of the present application;

[0048] Figure 4 A detailed structural diagram of a data driving module in a brightness compensation circuit provided in an embodiment of the present application;

[0049] Figure 5 A schematic flow chart of a brightness compensation method provided in an embodiment of the present application.

[0050] Description of Figure Numbers:

[0051] 100, ambient light detection module; 200, timing control module; Em, light control signal; 300, data drive module; Vdata, data voltage; D1, photodiode; DC, direct current power supply; ADC, analog-to-digital converter; 301, push-pull unit; VCC, power supply voltage; 302, filtering unit; 303, voltage regulation unit; 304, voltage conversion unit; Ui, input voltage; Uo, output voltage; Q1, N-type transistor; Q2, P-type transistor; C1, first capacitor; R1, first resistor; T1, transistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; OP, operational amplifier.

[0052] The realization of the purpose, functional features and advantages of the embodiments of the present application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] In the following description, specific details such as specific system structures, technologies, etc. are proposed for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the embodiments of the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from hindering the description of the embodiments of the present application.

[0054] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0055] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0056] With the vigorous development of display technology, high color gamut has become an important development direction. High color gamut means that the display screen has more colorful colors and stronger color display capabilities. QD (quantum dot) display technology is an innovative semiconductor nanocrystal technology that can accurately transmit light and efficiently improve the color gamut value and viewing angle of the display screen, making the colors purer and brighter, and making the color performance more dynamic. Displays using this technology can not only produce dynamic colors with a wider color gamut range, but also show real color palettes in the picture quality, surpassing the traditional backlight technology.

[0057] In recent years, the rapid development of OLED (Organic Light-Emitting Diode) display technology has promoted the rapid entry of curved and flexible display touch products into the market, and the technology updates in related fields are also changing with each passing day. OLED refers to a diode that uses organic semiconductor materials and luminescent materials to emit light through carrier injection and recombination under the drive of an electric field. OLED display devices have many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, high clarity and contrast, nearly 180° viewing angle, wide operating temperature range, flexible display and large-area full-color display, etc., and are recognized by the industry as the display device with the most development potential.

[0058] OLED is a current-driven device. When current flows through it, it emits light, and the brightness of the light is determined by the current flowing through the OLED itself. Most existing ICs (integrated circuits, integrated circuits, chips) only transmit voltage signals, so the pixel driving circuit of OLED needs to complete the task of converting voltage signals into current signals.

[0059] In order to improve the display effect of the display device, the technology of setting a quantum dot layer on the OLED device can be used to achieve the effect of improving the viewing angle and color gamut. However, due to the introduction of QD display technology, the panel is greatly affected by ambient light. In order to improve the display effect of the QD-OLED display device and prevent external light from exciting QD, causing the QD-OLED display device to present a yellowish reflective state when not displaying, the QD-OLED display device in the related technology will set a circular polarizer on the side close to the external light, and set a color film layer on the quantum dot layer to filter the external ambient light and reduce the impact of external light on the QD-OLED. However, this design will cause the light intensity of the QD-OLED's output light to weaken, that is, the actual brightness of the panel is lower than the ideal brightness, and will also increase the power consumption of the QD-OLED.

[0060] At present, the main means of compensating for QD-OLED brightness is to change the mixing method of the OLED light source in the process and to improve the process section. However, these methods are all in-plane process improvements, which are costly and complex, have low replaceability and adjustability, and are not convenient for evaluating whether the performance meets the standards.

[0061] Based on this, the embodiments of the present application provide a brightness compensation circuit, a brightness compensation method and a display panel, by adding an ambient light detection module to the non-display area to obtain ambient light intensity information, combining the ambient light intensity information and preset control information to determine weight parameters, and based on the weight parameters, a coupling operation is performed on the initial control signal originally generated by the timing control module only based on the image display signal to obtain a light-emitting control signal that takes into account the influence of ambient light. At the same time, the data driving module for generating a data voltage is improved in combination with the light-emitting control signal, so that the size of the data voltage can be changed by the light-emitting control signal, thereby realizing brightness compensation for the in-plane display area by controlling a single variable. In addition, compared with the in-plane process improvement method, the brightness compensation circuit has lower cost and complexity, higher replaceability and adjustability, and is easier to evaluate whether various parameters meet the performance standards.

[0062] The brightness compensation circuit, brightness compensation method and display panel provided in the embodiments of the present application are specifically described through the following embodiments. First, the brightness compensation circuit in the embodiments of the present application is described.

[0063] The present application embodiment provides a brightness compensation circuit, referring to Figure 1 , Figure 1 This is a schematic diagram of the structure of a brightness compensation circuit provided in an embodiment of the present application. In this embodiment, the brightness compensation circuit includes:

[0064] An ambient light detection module 100, a timing control module 200 and a data driving module 300 connected in sequence;

[0065] The ambient light detection module 100 is used to detect the ambient light intensity, convert the ambient light intensity into ambient light intensity information and transmit it to the timing control module 200;

[0066] The timing control module 200 is used to receive an image display signal, determine an initial control signal according to the image display signal, determine a weight parameter according to ambient light intensity information and preset control information, perform a coupling operation based on the initial control signal and the weight parameter to obtain a light emitting control signal Em, and output the light emitting control signal Em to the data driving module 300 and the in-plane display area;

[0067] The data driving module 300 is used to generate a corresponding data voltage Vdata according to a change of the light emitting control signal Em, and output the data voltage Vdata to the in-plane display area.

[0068] It should be noted that the preset control information may include multiple weight parameters of the control signal corresponding to each stage of ambient light collected or tested in advance. The preset control information can be burned in advance in a storage space that can be called by the timing control module 200. The storage space can be an internal or external memory of the timing control module 200, and this embodiment does not limit this.

[0069] In this embodiment, the timing control module 200 may be a TCON (timing controller) board, which may receive an image display signal from a signal input source, and generate a corresponding initial control signal Em' according to the image display signal, and the original edge of the initial control signal Em' is used to directly output to the in-plane display area for light control. However, in order to overcome the situation that the actual brightness of the panel is lower than the ideal brightness due to the shielding of ambient light by the addition of a circular polarizer and a color film layer in the QD-OLED, a new ambient light sensing circuit is added to the external drive circuit of the display panel, that is, the ambient light detection module 100 connected to the timing control module 200, which can determine the weight parameter F for adjusting the initial control signal Em' in combination with the ambient light intensity information collected and the preset control information, so that the light control signal Em actually output by the TCON is equal to F*Em'. As an example, after the timing control module 200 receives the ambient light intensity information, different weight parameters stored at different addresses can be selected from the storage space according to the specific data of the ambient light intensity information.

[0070] In the present embodiment, the data driving module 300 is different from the P_Gamma IC (programmable gamma correction buffer circuit chip) commonly used in the external driving circuit of the display panel to generate a fixed data voltage value. The voltage value of the data voltage Vdata will change according to the change of the light control signal Em output by the timing control module 200. For example, the size of the data voltage Vdata is controlled by the duty cycle of the light control signal Em. Therefore, in the present embodiment, by adding an ambient light detection module 100, improving the logic of the timing control module 200 outputting the light control signal Em, and changing the generation method of the data voltage Vdata, it is achieved that only a single variable light control signal Em needs to be changed to adjust the size of the data voltage Vdata accordingly. The light control signal Em and the data voltage Vdata are transmitted to the in-plane display area to complete the brightness control of the display panel. The brightness control of the display panel only by the light control signal Em can have better linkage with the ambient light detection, so that the brightness compensation effect is better.

[0071] The embodiment of the present application provides a brightness compensation circuit, which obtains ambient light intensity information by adding an ambient light detection module in the non-display area, determines weight parameters in combination with the ambient light intensity information and preset control information, and performs coupling operation on the initial control signal originally generated by the timing control module based only on the image display signal based on the weight parameters, so as to obtain a light-emitting control signal that takes into account the influence of ambient light. At the same time, the data driving module for generating the data voltage is improved in combination with the light-emitting control signal, so that the size of the data voltage can be changed by the light-emitting control signal, thereby realizing brightness compensation for the in-plane display area by controlling a single variable. In addition, compared with the in-plane process improvement method, the brightness compensation circuit has lower cost and complexity, higher replaceability and adjustability, and is easier to evaluate whether various parameters meet the performance standards.

[0072] Reference Figure 2 In some feasible embodiments, the ambient light detection module 100 may include:

[0073] A photodiode D1, wherein the anode of the photodiode D1 is connected to a direct current power supply DC, and the photodiode D1 is used to convert the ambient light intensity into a photocurrent;

[0074] Analog-to-digital converter ADC, the input end of the analog-to-digital converter ADC is connected to the cathode of the photodiode D1, the output end of the analog-to-digital converter ADC is connected to the timing control module 200, and the analog-to-digital converter ADC is used to convert the photocurrent into ambient light intensity information and transmit it to the timing control module 200.

[0075] In this embodiment, the ambient light intensity is detected by the photodiode D1, the direct current power supply DC can be a negative voltage power supply, the photodiode D1 can convert the ambient light intensity into a photocurrent, and the photocurrent can be converted into a binary digital format after quantization through an analog to digital converter ADC (analog to digital converter). Generally speaking, in an indoor environment, assuming that the ambient light current is 0-10mA and the diode accuracy is 1uA, the quantized value range can be set to 0-10000, and the highest bit after conversion to binary is 0010011100010000 (16-bit number), which does not exceed the value range that the I / O port of TCON can receive, so the value is successfully sent to the I / O port of TCON so that TCON receives the ambient light intensity information.

[0076] Reference Figure 3 In some feasible embodiments, the data driving module 300 may include:

[0077] A push-pull unit 301, wherein the input end of the push-pull unit 301 is connected to the light-emitting control signal Em, the first polarity end of the push-pull unit 301 is connected to the power supply voltage VCC, the second polarity end of the push-pull unit 301 is grounded, and the push-pull unit 301 is used to pull up the voltage of the light-emitting control signal Em to obtain a digital control voltage;

[0078] A filter unit 302, wherein the input end of the filter unit 302 is connected to the output end of the push-pull unit 301, the ground end of the filter unit 302 is grounded, and the filter unit 302 is used to perform digital-to-analog conversion on the digital control voltage to obtain an analog control voltage;

[0079] A voltage regulating unit 303, wherein a controlled end of the voltage regulating unit 303 is connected to an output end of the filter unit 302, a first end of the voltage regulating unit 303 is grounded, and an on / off state of the voltage regulating unit 303 is determined based on an analog control voltage;

[0080] A voltage conversion unit 304, wherein a first input terminal of the voltage conversion unit 304 is connected to an input voltage Ui, a second input terminal of the voltage conversion unit 304 is grounded, a feedback terminal of the voltage conversion unit 304 is connected to a second terminal of the voltage regulating unit 303, an output terminal of the voltage conversion unit 304 is connected to an in-plane display area, and the voltage conversion unit 304 is used to convert the input voltage Ui and a gain multiple to obtain a data voltage Vdata; wherein the gain multiple changes with the on-off state of the voltage regulating unit 303.

[0081] In this embodiment, by designing Figure 3 The data driving module 300 shown, which is composed of a push-pull unit 301, a filtering unit 302, a voltage regulating unit 303 and a voltage converting unit 304, can make the magnitude of the data voltage Vdata controlled by the light emitting control signal Em.

[0082] In this embodiment, the push-pull unit 301 is used to increase the voltage value of the light-emitting control signal Em, thereby obtaining a digital control voltage; the filtering unit 302 is used to perform digital-to-analog conversion on the digital control voltage to obtain an analog control voltage, thereby reducing the conversion energy consumption of the DAC (digital to analog converter) on the external driving circuit of the display panel; the level of the analog control voltage will affect the on-off state of the voltage regulating unit 303, thereby affecting the gain multiple of the voltage conversion unit 304. When the input voltage Ui remains basically unchanged, the output voltage Uo can be changed by changing the gain multiple, that is, the size of the data voltage Vdata that needs to be output to the in-plane display area is changed. It can be seen that in the data driving module 300 provided in this embodiment, the data voltage Vdata will change with the change of the light-emitting control signal Em.

[0083] As an example, in this embodiment, the input voltage Ui may adopt AVDD 15-16V.

[0084] Reference Figure 4 In some feasible embodiments, the push-pull unit 301 may include:

[0085] N-type transistor Q1, the base of the N-type transistor Q1 is connected to the light-emitting control signal Em, the collector of the N-type transistor Q1 is connected to the power supply voltage VCC, and the emitter of the N-type transistor Q1 is connected to the input end of the filter unit 302;

[0086] The P-type transistor Q2 has its base connected to the light-emitting control signal Em, its collector connected to the ground, and its emitter connected to the input end of the filter unit 302 .

[0087] In this embodiment, the push-pull unit 301 is composed of an N-type transistor Q1 and a P-type transistor Q2. The bases of the N-type transistor Q1 and the P-type transistor Q2 are connected together as the input end of the push-pull unit 301. The collector of the N-type transistor Q1 is equivalent to the first polarity end of the push-pull unit 301. The collector of the P-type transistor Q2 is equivalent to the second polarity end of the push-pull unit 301. The emitters of the N-type transistor Q1 and the P-type transistor Q2 are connected together as the output end of the push-pull unit 301.

[0088] Reference Figure 4 In some feasible embodiments, the filtering unit 302 may include:

[0089] A first capacitor C1, wherein a first end of the first capacitor C1 is connected to the output end of the push-pull unit 301, and a second end of the first capacitor C1 is grounded;

[0090] A first resistor R1 , wherein a first end of the first resistor R1 is connected to an output end of the push-pull unit 301 .

[0091] In this embodiment, the first end of the first capacitor C1 and the first end of the first resistor R1 are connected together as the input end of the filter unit 302, the second end of the first capacitor C1 is equivalent to the ground end of the filter unit 302, and the second end of the first resistor R1 is equivalent to the output end of the filter unit 302.

[0092] In this embodiment, the first resistor R1 and the first capacitor C1 can form a simple first-order low-pass filter, which performs digital-to-analog conversion on the light emitting control signal Em, ie, the digital control voltage, pulled up by the push-pull unit 301 to obtain an analog control voltage.

[0093] Reference Figure 4 In some feasible embodiments, the voltage regulating unit 303 may include:

[0094] A transistor T1, wherein a gate of the transistor T1 is connected to an output terminal of the filter unit 302, a first terminal of the transistor T1 is connected to a feedback terminal of the voltage conversion unit 304, and an on-off state of the transistor T1 is determined based on an analog control voltage;

[0095] The second resistor R2 has a first end connected to the second end of the transistor T1 and a second end grounded.

[0096] In this embodiment, the gate of the transistor T1 is equivalent to the controlled end of the voltage regulating unit 303 , the second end of the second resistor R2 is equivalent to the first end of the voltage regulating unit 303 , and the first end of the transistor T1 is equivalent to the second end of the voltage regulating unit 303 .

[0097] In this embodiment, the transistor T1 may be a TFT (Thin Film Transistor), a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) or other devices with the same characteristics. Since the source and drain of the transistor used here are symmetrical, the source and drain are interchangeable. In this embodiment, in order to distinguish the two poles of the transistor except the gate, one of the poles is called the source and the other is called the drain. Since the transistor used in this embodiment may include a P-type transistor and / or an N-type transistor, the P-type transistor is turned on when the gate is at a low level and is turned off when the gate is at a high level, and the N-type transistor is turned on when the gate is at a high level and is turned off when the gate is at a low level. The source and drain of the P-type transistor and the N-type transistor are opposite. Therefore, in this embodiment, the two stages of the transistor T1 except the gate are only named as the first end and the second end, and the specific source and drain are determined by whether the transistor T1 is a P-type transistor or an N-type transistor.

[0098] In this embodiment, when the filtering unit 302 sends an analog voltage signal to the gate of the transistor T1, the on and off of the transistor T1 can be controlled, thereby changing the resistance value r between the first end and the second end (the resistance between the drain and the source of the transistor T1). Since the resistance r affects the gain multiple of the voltage conversion unit 304, the automatic gain multiple switching can be achieved by changing the on and off of the transistor T1 by changing the value of the resistance r, thereby achieving the purpose of controlling the size of the data voltage Vdata through the light-emitting control signal Em.

[0099] Reference Figure 4 In some feasible embodiments, the voltage conversion unit 304 may include:

[0100] A third resistor R3, a first end of the third resistor R3 is connected to the input voltage Ui;

[0101] A fourth resistor R4, a first end of the fourth resistor R4 is grounded;

[0102] a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to a second end of the third resistor R3, and a second end of the fifth resistor R5 is connected to a second end of the voltage regulating unit 303;

[0103] a sixth resistor R6, wherein a first end of the sixth resistor R6 is connected to a second end of the fifth resistor R5;

[0104] An operational amplifier OP, an inverting input terminal of the operational amplifier OP is connected to the second end of the third resistor R3, a non-inverting input terminal of the operational amplifier OP is connected to the second end of the fourth resistor R4, and an output terminal of the operational amplifier OP is connected to the second end of the sixth resistor R6 and the in-plane display area.

[0105] In this embodiment, the first end of the third resistor R3 is equivalent to the first input end of the voltage conversion unit 304, the first end of the fourth resistor R4 is equivalent to the second input end of the voltage conversion unit 304, the second end of the fifth resistor R5 and the first end of the sixth resistor R6 are connected together as the feedback end of the voltage conversion unit 304, and the output end of the operational amplifier OP and the second end of the sixth resistor R6 are connected together as the output end of the voltage conversion unit 304.

[0106] In this embodiment, after the input voltage Ui is converted by the voltage conversion unit 304, an output voltage Uo can be obtained. The relationship between the two is Uo=[(R5+R6+R5R6 / Rx) / R3]Ui, wherein Rx=R2+r. It can be seen that the gain multiple of the voltage conversion unit 304 is related to the variable resistance value r, and the variable resistance value r changes with the on-off state of the transistor T1. The on-off state of the transistor T1 is determined by the analog control voltage, and the change of the analog control voltage is due to the change of the light-emitting control signal Em.

[0107] As an example, by changing the duty cycle of the light emitting control signal Em through the timing control module 200, the data voltage Vdata can be flexibly adjusted.

[0108] In some feasible embodiments, the brightness compensation circuit may further include:

[0109] A connector, the connector is connected to the timing control module 200 and the signal input source respectively, and the connector is used to transmit the image display signal from the signal input source to the timing control module 200;

[0110] The memory is connected to the timing control module 200 , and is used to pre-store preset comparison information for the timing control module 200 to call.

[0111] In this embodiment, the brightness compensation circuit may further include a connector and a memory connected to the timing control module 200 . The connector and the memory may interact with the timing control module 200 via an I2C protocol to achieve the purpose of communication.

[0112] As an example, in this embodiment, the memory may be an EEPROM (Electrically Erasable Programmable read only memory), or a Flash (flash memory), or other types of memory, which are not limited in this embodiment.

[0113] In addition, the embodiment of the present application also provides a brightness compensation method, referring to Figure 5 , Figure 5 This is a flow chart of a brightness compensation method provided in an embodiment of the present application. In this embodiment, the brightness compensation method is applied to the brightness compensation circuit provided in the above embodiment, and the brightness compensation method includes steps S10 to S40.

[0114] Step S10, detecting the ambient light intensity, converting the ambient light intensity into ambient light intensity information, and determining a weight parameter according to the ambient light intensity information and preset comparison information;

[0115] Step S20, receiving an image display signal, and determining an initial control signal according to the image display signal;

[0116] Step S30, performing coupling operation based on the initial control signal and the weight parameter to obtain a light emitting control signal, and outputting the light emitting control signal to the in-plane display area;

[0117] Step S40 , generating a corresponding data voltage according to the change of the light emitting control signal, and outputting the data voltage to the in-plane display area.

[0118] The brightness compensation method provided in this embodiment and the brightness compensation circuit provided in the above-mentioned embodiment belong to the same technical concept. The specific structure and working principle of the brightness compensation circuit can refer to the above-mentioned embodiment. Since the display panel proposed in this embodiment adopts all the technical solutions of all the above-mentioned embodiments, this embodiment at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0119] In addition, an embodiment of the present application further provides a display panel, which includes the brightness compensation circuit provided by the above embodiment.

[0120] As an example, the display panel in this embodiment can be a QD-OLED display panel. Of course, it can also be other types of display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, etc. This embodiment is not limited to this.

[0121] As an example, the display panel can be applied to a display device, which can be a monitor, a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function.

[0122] The specific structure and working principle of the brightness compensation circuit in this embodiment can refer to the above embodiments. Since the display panel proposed in this embodiment adopts all the technical solutions of all the above embodiments and belongs to the same technical concept, this embodiment at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0123] It should be noted that the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0124] The above are only optional embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structures or equivalent process changes made using the contents of the present application specification and drawings under the application concept of the present application, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A brightness compensation circuit, characterized in that: The brightness compensation circuit comprises: an ambient light detection module, a timing control module and a data driving module connected in sequence; The ambient light detection module is used to detect the ambient light intensity, convert the ambient light intensity into ambient light intensity information and transmit it to the timing control module; The timing control module is used to receive an image display signal, determine an initial control signal according to the image display signal, determine a weight parameter according to the ambient light intensity information and the preset comparison information, perform a coupling operation based on the initial control signal and the weight parameter to obtain a light emitting control signal, and output the light emitting control signal to the data driving module and the in-plane display area; The data driving module is used to generate a corresponding data voltage according to a change of the light emitting control signal, and output the data voltage to the in-plane display area.

2. The brightness compensation circuit according to claim 1, characterized in that: The ambient light detection module comprises: A photodiode, wherein the anode of the photodiode is connected to a DC power supply, and the photodiode is used to convert the ambient light intensity into a photocurrent; An analog-to-digital converter, wherein the input end of the analog-to-digital converter is connected to the cathode of the photodiode, the output end of the analog-to-digital converter is connected to the timing control module, and the analog-to-digital converter is used to convert the photocurrent into the ambient light intensity information and transmit it to the timing control module.

3. The brightness compensation circuit according to claim 1, characterized in that: The data driving module comprises: A push-pull unit, wherein an input end of the push-pull unit is connected to the light-emitting control signal, a first polarity end of the push-pull unit is connected to a power supply voltage, a second polarity end of the push-pull unit is grounded, and the push-pull unit is used to pull up the voltage of the light-emitting control signal to obtain a digital control voltage; A filter unit, wherein an input end of the filter unit is connected to an output end of the push-pull unit, a ground end of the filter unit is grounded, and the filter unit is used to perform digital-to-analog conversion on the digital control voltage to obtain an analog control voltage; a voltage regulating unit, wherein a controlled end of the voltage regulating unit is connected to an output end of the filtering unit, a first end of the voltage regulating unit is grounded, and an on-off state of the voltage regulating unit is determined based on the analog control voltage; A voltage conversion unit, wherein a first input terminal of the voltage conversion unit is connected to an input voltage, a second input terminal of the voltage conversion unit is grounded, a feedback terminal of the voltage conversion unit is connected to a second terminal of the voltage regulating unit, an output terminal of the voltage conversion unit is connected to the in-plane display area, and the voltage conversion unit is used to convert the input voltage and a gain multiple to obtain the data voltage; wherein the gain multiple changes with the on-off state of the voltage regulating unit.

4. The brightness compensation circuit according to claim 3, characterized in that: The push-pull unit comprises: An N-type transistor, wherein the base of the N-type transistor is connected to the light-emitting control signal, the collector of the N-type transistor is connected to the power supply voltage, and the emitter of the N-type transistor is connected to the input end of the filtering unit; A P-type transistor, wherein the base of the P-type transistor is connected to the light-emitting control signal, the collector of the P-type transistor is grounded, and the emitter of the P-type transistor is connected to the input end of the filtering unit.

5. The brightness compensation circuit according to claim 3, characterized in that: The filtering unit comprises: A first capacitor, wherein a first end of the first capacitor is connected to the output end of the push-pull unit, and a second end of the first capacitor is grounded; A first resistor, wherein a first end of the first resistor is connected to an output end of the push-pull unit.

6. The brightness compensation circuit according to claim 3, characterized in that: The voltage regulating unit comprises: a transistor, wherein a gate of the transistor is connected to an output terminal of the filtering unit, a first terminal of the transistor is connected to a feedback terminal of the voltage conversion unit, and an on-off state of the transistor is determined based on the analog control voltage; A second resistor, wherein a first end of the second resistor is connected to the second end of the transistor, and a second end of the second resistor is grounded.

7. The brightness compensation circuit according to claim 3, characterized in that: The voltage conversion unit comprises: a third resistor, a first end of the third resistor being connected to the input voltage; A fourth resistor, a first end of the fourth resistor is grounded; a fifth resistor, wherein a first end of the fifth resistor is connected to a second end of the third resistor, and a second end of the fifth resistor is connected to a second end of the voltage regulating unit; a sixth resistor, a first end of the sixth resistor being connected to the second end of the fifth resistor; An operational amplifier, wherein the inverting input terminal of the operational amplifier is connected to the second end of the third resistor, the non-inverting input terminal of the operational amplifier is connected to the second end of the fourth resistor, and the output terminal of the operational amplifier is connected to the second end of the sixth resistor and the in-plane display area.

8. The brightness compensation circuit according to any one of claims 1 to 7, characterized in that: The brightness compensation circuit also includes: A connector, the connector being connected to the timing control module and the signal input source respectively, and the connector being used to transmit the image display signal from the signal input source to the timing control module; A memory, wherein the memory is connected to the timing control module, and the memory is used to pre-store the preset comparison information for the timing control module to call.

9. A brightness compensation method, characterized in that: The brightness compensation method is applied to the brightness compensation circuit according to any one of claims 1 to 8, comprising: Detecting ambient light intensity, converting the ambient light intensity into ambient light intensity information, and determining a weight parameter according to the ambient light intensity information and preset comparison information; receiving an image display signal, and determining an initial control signal according to the image display signal; Performing a coupling operation based on the initial control signal and the weight parameter to obtain a light emitting control signal, and outputting the light emitting control signal to an in-plane display area; A corresponding data voltage is generated according to a change of a light emitting control signal, and the data voltage is output to the in-plane display area.

10. A display panel, characterized in that: The display panel includes the brightness compensation circuit according to any one of claims 1 to 8.

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