Compensation circuit, circuit board assembly, and electronic device

Abstract

A compensation circuit (300), a circuit board assembly (400), and an electronic device (500), related to the technical field of displays, which are used for compensating a voltage drop of a power supply voltage signal received at two ends of a display panel (10), to improve a display effect of the display panel (10). The compensation circuit (300) comprises a receiving sub-circuit (301), a first computing sub-circuit (302), and a second computing sub-circuit (303). The receiving sub-circuit (301) comprises an adding module (310) and a voltage follower module (320). The adding module (310) is used to receive a first power supply voltage signal (Vdd1) and a second power supply voltage signal (Vdd2), and an output end of the adding module (310) is coupled to an input end of the voltage follower module (320). The voltage follower module (320) is used to output a follower voltage signal (Vg). The first computing sub-circuit (302) is used to receive a first reference voltage (V1) and the follower voltage signal (Vg) and output a first gamma signal (VGMH). The second computing sub-circuit (303) is used to receive a second reference voltage (V2) and the follower voltage signal (Vg), and output a second gamma signal (VGML). The compensation circuit (300) is applied to the electronic device (500), so as to improve the performance of the electronic device (500).

Description

Compensation circuits, circuit board assemblies and electronic devices

[0001] This application claims priority to Chinese patent application filed on October 31, 2024, with application number 202411547223.X and entitled "Compensation Circuit, Circuit Board Assembly and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, and more particularly to a compensation circuit, circuit board assembly, and electronic device. Background Technology

[0003] Organic light-emitting diode (OLED) display panels are widely used in electronic devices due to their self-emissive nature, low power consumption, high light conversion efficiency, short response time, and low cost. An OLED display panel consists of multiple sub-pixels, each comprising a pixel driving circuit and a light-emitting device. The pixel driving circuit is used to drive the light-emitting device to emit light.

[0004] Electronic devices can supply power voltage signals to both ends of the OLED display panel via a power management integrated circuit (PMIC). These power voltage signals are transmitted to the pixel driving circuit to generate driving current. The magnitude of the driving current affects the brightness of the light-emitting devices. Due to the long transmission path between the power management circuit and the OLED display panel, the power voltage signal is prone to significant IR drop during transmission. This IR drop not only affects the display effect of sub-pixels in the OLED display panel but also impacts the brightness consistency of different OLED display panels of the same specifications. Summary of the Invention

[0005] This application provides a compensation circuit, a circuit board assembly, and an electronic device for compensating for the voltage drop of the power supply voltage signal received at both ends of a display panel, thereby improving the display effect of the display panel and ensuring the consistency of brightness among different display panels of the same specifications.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] Firstly, a compensation circuit is provided. This compensation circuit includes a receiving sub-circuit, a first calculation sub-circuit, and a second calculation sub-circuit. The receiving sub-circuit includes an adder module and a voltage follower module. The adder module receives a first power supply voltage signal and a second power supply voltage signal, and its output terminal is coupled to the input terminal of the voltage follower module. The voltage follower module outputs a follower voltage signal. The first calculation sub-circuit receives a first reference voltage and the follower voltage signal, and outputs a first gamma signal. The voltage value of the first gamma signal is the sum of the voltage values ​​of the first reference voltage and the follower voltage signal. The second calculation sub-circuit receives a second reference voltage and the follower voltage signal, and outputs a second gamma signal. The voltage value of the second gamma signal is the difference between the voltage values ​​of the second reference voltage and the follower voltage signal.

[0008] The compensation circuit provided in this application first generates a following voltage signal based on a first power supply voltage signal and a second power supply voltage signal using an adder module and a voltage follower module. Then, based on the following voltage signal, it generates a first gamma signal and a second gamma signal using a first calculation sub-circuit and a second calculation sub-circuit. The voltage value of the first gamma signal is the sum of the voltage values ​​of the first reference voltage and the following voltage signal, so that the first gamma signal can compensate for the voltage values ​​of the first power supply voltage signal and the second power supply voltage signal. The second gamma signal is the difference between the voltage values ​​of the second reference voltage and the following voltage signal, so that the second gamma signal can also compensate for the voltage values ​​of the first power supply voltage signal and the second power supply voltage signal.

[0009] When the compensation circuit provided in this application embodiment is applied to an electronic device, the output terminal of the compensation circuit (i.e., the output terminal of the first calculation sub-circuit and the output terminal of the second calculation sub-circuit) can be connected to the input terminal of the source driver to transmit the first gamma signal and the second gamma signal to the source driver. The source driver can generate a data voltage signal based on the first gamma signal and the second gamma signal. In this way, the voltage values ​​of the first power supply voltage signal and the second power supply voltage signal are compensated in the data voltage signal.

[0010] After the data voltage signal is input to the pixel driving circuit, the pixel circuit generates a driving current based on the data voltage signal, the first power supply voltage signal, and the second power supply voltage signal. Since the voltage values ​​of the first and second power supply voltage signals are compensated in the data voltage signal, the influence of the voltage drop of the first and second power supply voltage signals on the magnitude of the driving current can be eliminated. This achieves compensation for the voltage drop of the first and second power supply voltage signals, thereby improving the problem of small driving current, dim display panel brightness, and poor display effect caused by the voltage drop of the first and second power supply voltage signals.

[0011] For different electronic devices of the same specifications, the voltage drop of the first power supply voltage signal and the voltage drop of the second power supply voltage signal may differ due to factors such as display panel loading and trace impedance, resulting in brightness differences between the display panels of electronic devices of the same specifications. This application embodiment utilizes a compensation circuit to compensate for the voltage drop of the first power supply voltage signal and the voltage drop of the second power supply voltage signal, thereby improving or even resolving the problem of brightness differences between the display panels caused by the different voltage drops of the first and second power supply voltage signals in different electronic devices of the same specifications.

[0012] In some embodiments, the adder module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier. The first terminal of the first resistor receives the first power supply voltage signal, the first terminal of the second resistor receives the second power supply voltage signal, and the second terminals of both the first and second resistors are connected to the non-inverting input of the first operational amplifier. The first terminal of the third resistor is connected to ground, and the second terminal of the third resistor is connected to the inverting input of the first operational amplifier. The first terminal of the fourth resistor is connected to the inverting input of the first operational amplifier, and the second terminal of the fourth resistor and the output of the first operational amplifier are both coupled to the input of the voltage follower module.

[0013] In some embodiments, the voltage follower module includes a voltage follower, a first input terminal of which is connected to the output terminal of the adder module, and a second input terminal of which is coupled to the output terminal of the voltage follower; the output terminal of the voltage follower is connected to the input terminals of the first calculation sub-circuit and the second calculation sub-circuit. The voltage follower is used to receive the following voltage signal output by the adder module and to output the following voltage signal to the first calculation sub-circuit and the second calculation sub-circuit.

[0014] In this embodiment, both the addition module and the voltage follower module are analog circuits. The follower voltage signal output by the receiving sub-circuit is an analog signal. Since analog signals have precise resolution and are easy to process, the accuracy of the first gamma signal and the second gamma signal can be improved when the follower voltage signal is used to generate the first gamma signal and the second gamma signal, thus ensuring the compensation effect of the compensation circuit on the voltage drop of the first power supply voltage signal and the voltage drop of the second power supply voltage signal.

[0015] In some embodiments, the voltage value of the following voltage signal is the sum of a first product and a second product. The first product is the product of the voltage value of the first power supply voltage signal and a first coefficient, and the second product is the product of the voltage value of the second power supply voltage signal and a second coefficient. Both the first coefficient and the second coefficient are greater than or equal to 0, and neither the first coefficient nor the second coefficient is simultaneously 0.

[0016] This application embodiment allows adjustment of the weights of the first and second power supply voltage signals in the following voltage signal by adjusting the values ​​of the first and second coefficients. The voltage value of the first gamma signal is the sum of the first reference voltage and the voltage value of the following voltage signal. Adjusting the weights of the first and second power supply voltage signals in the following voltage signal affects the weights of the first and second power supply voltage signals in the first gamma signal. The second gamma signal is the difference between the voltage values ​​of the second reference voltage and the following voltage signal. Adjusting the weights of the first and second power supply voltage signals in the following voltage signal affects the weights of the first and second power supply voltage signals in the second gamma signal.

[0017] Since the data voltage signal is obtained based on the first gamma signal and the second gamma signal, adjusting the values ​​of the first coefficient and the second coefficient can affect the weight of the first power supply voltage signal and the weight of the second power supply voltage signal in the data voltage signal, that is, affect the compensation strength of the first power supply voltage signal and the compensation strength of the second power supply voltage signal in the data voltage signal.

[0018] This allows the compensation circuit to be adapted to different electronic devices, improving its applicability. Furthermore, for a single electronic device, by setting a first coefficient and a second coefficient to adjust the compensation intensity of the first and second power supply voltage signals, compensation can be applied to the first and second power supply voltage signals according to actual needs when their voltage drops differ, improving the compensation effect and further enhancing the display panel's display performance.

[0019] In some embodiments, the first calculation sub-circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a third operational amplifier. The first terminal of the fifth resistor is used to receive the first reference voltage, and the first terminal of the sixth resistor is used to receive the following voltage signal; the second terminals of both the fifth and sixth resistors are connected to the non-inverting input of the third operational amplifier. The first terminal of the seventh resistor is connected to ground, and the second terminal of the seventh resistor is connected to the inverting input of the third operational amplifier. The first terminal of the eighth resistor is connected to both the inverting input of the third operational amplifier and the second terminal of the seventh resistor, and the second terminal of the eighth resistor is connected to the output of the third operational amplifier. The fifth and sixth resistors have the same resistance value, and the seventh and eighth resistors have the same resistance value.

[0020] In the embodiments of this application, the first calculation sub-circuit is also an analog circuit. The first gamma signal output by the first calculation sub-circuit is an analog signal. Analog signals have the characteristics of accurate resolution and easy processing. When using the first gamma signal to generate a data voltage signal, it is beneficial to improve the accuracy of the data voltage signal, thereby improving the compensation accuracy of the data voltage signal for the first power supply voltage signal and the second power supply voltage signal.

[0021] In some embodiments, the second calculation sub-circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a fourth operational amplifier. The first terminal of the ninth resistor receives the following voltage signal; the first terminal of the tenth resistor is connected to ground; and the second terminals of both the ninth and tenth resistors are connected to the non-inverting input of the fourth operational amplifier. The first terminal of the eleventh resistor receives the second reference voltage; and the second terminal of the eleventh resistor is connected to the inverting input of the fourth operational amplifier. The first terminal of the twelfth resistor is connected to both the inverting input of the fourth operational amplifier and the second terminal of the eleventh resistor; the second terminal of the twelfth resistor is connected to the output of the fourth operational amplifier. The ninth and tenth resistors have the same resistance value, and the eleventh and twelfth resistors have the same resistance value.

[0022] In the embodiments of this application, the second calculation sub-circuit is an analog circuit, and the second gamma signal output by the second calculation sub-circuit is an analog signal. The analog signal has the characteristics of accurate resolution and easy processing. When the second gamma signal is used to generate the data voltage signal, it is beneficial to improve the accuracy of the data voltage signal, thereby improving the compensation accuracy of the data voltage signal for the first power supply voltage signal and the second power supply voltage signal.

[0023] In some embodiments, the compensation circuit further includes a generation sub-circuit, wherein the input terminals of the first calculation sub-circuit and the second calculation sub-circuit are both connected to the output terminal of the generation sub-circuit; the generation sub-circuit is used to output the first reference voltage to the first calculation sub-circuit and the second reference voltage to the second calculation sub-circuit.

[0024] In some embodiments, the generation sub-circuit includes a first voltage divider unit and a second voltage divider unit. The input terminal of the first voltage divider unit is used to receive the reference voltage, and the output terminal of the first voltage divider unit outputs the first reference voltage. The input terminal of the second voltage divider unit is used to receive the reference voltage, and the output terminal of the second voltage divider unit outputs the second reference voltage.

[0025] In some embodiments, the first voltage divider unit includes a thirteenth resistor and a fourteenth resistor connected together. The first end of the thirteenth resistor is used to receive the reference voltage. The second end of the thirteenth resistor is connected to the first end of the fourteenth resistor, and the second end of the fourteenth resistor is connected to a ground terminal. The second end of the thirteenth resistor and the first end of the fourteenth resistor are both coupled to the input terminal of the first calculation sub-circuit.

[0026] In this embodiment, a voltage divider circuit is constructed using a thirteenth resistor and a fourteenth resistor to generate a first reference voltage from a reference voltage. The value of the first reference voltage is less than the value of the reference voltage. The resistance values ​​of the thirteenth and fourteenth resistors can be adjusted according to the magnitudes of the reference voltage and the first reference voltage.

[0027] The second voltage divider unit includes a fifteenth resistor and a sixteenth resistor connected together. The first end of the fifteenth resistor is used to receive the reference voltage. The second end of the fifteenth resistor is connected to the first end of the sixteenth resistor. The second end of the sixteenth resistor is connected to the ground terminal. The second end of the fifteenth resistor and the first end of the sixteenth resistor are both coupled to the input terminal of the second calculation sub-circuit.

[0028] In this embodiment, a voltage divider circuit is constructed using a fifteenth resistor and a sixteenth resistor to generate a second reference voltage from a reference voltage. The value of the second reference voltage is less than the value of the reference voltage. The resistance values ​​of the fifteenth and sixteenth resistors can be adjusted according to the magnitudes of the reference voltage and the second reference voltage.

[0029] In some embodiments, the generation sub-circuit includes a seventeenth resistor, an eighteenth resistor, and a nineteenth resistor. A first terminal of the seventeenth resistor receives the reference voltage. A second terminal of the seventeenth resistor is connected to the first terminal of the eighteenth resistor, and a second terminal of the eighteenth resistor is connected to the first terminal of the nineteenth resistor. The second terminal of the nineteenth resistor is connected to ground. The second terminal of the seventeenth resistor and the first terminal of the eighteenth resistor are both coupled to the input terminal of the first calculation sub-circuit. The second terminal of the eighteenth resistor and the first terminal of the nineteenth resistor are both coupled to the input terminal of the second calculation sub-circuit.

[0030] In this embodiment, a voltage divider circuit is constructed using the seventeenth, eighteenth, and nineteenth resistors, such that the node voltage (i.e., the first reference voltage) between the seventeenth and eighteenth resistors is less than the reference voltage, and the node voltage (i.e., the second reference voltage) between the eighteenth and nineteenth resistors is also less than the reference voltage. By adjusting the resistance values ​​of the seventeenth, eighteenth, and nineteenth resistors, the voltage division of the seventeenth, eighteenth, and nineteenth resistors can be adjusted, thereby adjusting the magnitudes of the first and second reference voltages.

[0031] In a second aspect, a circuit board assembly is provided. The circuit board assembly includes a first circuit board and a compensation circuit. The first circuit board includes a first power connection line and a feedback signal line. The compensation circuit is located on the first circuit board and connected to the first power connection line and the feedback signal line. The first power connection line is used to provide a first power supply voltage signal to the compensation circuit; the feedback signal line is used to provide a second power supply voltage signal to the compensation circuit.

[0032] In some embodiments, the circuit board assembly further includes a power supply circuit located on the first circuit board and connected to the compensation circuit. The power supply circuit is used to provide a reference voltage to the compensation circuit, and the compensation circuit is also used to generate a first reference voltage and a second reference voltage based on the reference voltage.

[0033] Thirdly, an electronic device is provided. The electronic device includes a display panel, a second circuit board, and a circuit board assembly as provided in any of the above embodiments.

[0034] The display panel includes multiple power supply voltage lines; the display panel has a first end and a second end opposite to each other in the extending direction of the power supply voltage lines. A circuit board assembly is connected to the first end of the display panel; a first power connection line of the circuit board assembly is connected to the first end of the multiple power supply voltage lines. A second circuit board is connected to the second end of the display panel; the second circuit board includes a second power connection line, the second power connection line is connected to the second end of the multiple power supply voltage lines, and the second power connection line is also connected to a feedback signal line of the circuit board assembly.

[0035] In some embodiments, the electronic device further includes a main circuit board, a first connection circuit board, and a second connection circuit board. The main circuit board includes a first transmission line. The first connection circuit board connects the circuit board assembly to the main circuit board; the first connection circuit board includes a first connection line. The second connection circuit board connects the second circuit board to the main circuit board, and the second connection circuit board includes a second connection line. A first end of the first connection line is connected to the feedback signal line, and a second end of the first connection line is connected to a first end of the first transmission line; a first end of the second connection line is connected to a second end of the first transmission line, and a second end of the second connection line is connected to a second power connection line.

[0036] In some embodiments, the main circuit board further includes a power supply circuit, a second transmission line, and a third transmission line; the first end of the second transmission line and the first end of the third transmission line are both connected to the power supply circuit. The first connection circuit board further includes a third connection line, the first end of which is connected to the second end of the second transmission line, and the second end of which is connected to the first power supply connection line. The second connection circuit board further includes a fourth connection line, the first end of which is connected to the second end of the third transmission line, and the second end of which is connected to the second power supply connection line.

[0037] In some embodiments, the display panel further includes multiple data lines, and the electronic device further includes at least one source driver connected to the multiple data lines. A compensation circuit of the circuit board assembly is connected to the at least one source driver, and the compensation circuit is used to output a first gamma signal and a second gamma signal to the at least one source driver.

[0038] The technical effects of any of the design methods in the second and third aspects can be found in the technical effects of different design methods in the first aspect, and will not be repeated here. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in some embodiments of this application will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this application.

[0040] Figure 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0041] Figure 2 is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0042] Figure 3 is a schematic diagram of a sub-pixel circuit structure provided in an embodiment of this application;

[0043] Figure 4 is a schematic diagram of the structure of another electronic device provided in an embodiment of this application;

[0044] Figure 5 is a structural block diagram of a compensation circuit provided in an embodiment of this application;

[0045] Figure 6 is a schematic diagram of the circuit structure of a compensation circuit provided in an embodiment of this application;

[0046] Figure 7 is a structural block diagram of another compensation circuit provided in an embodiment of this application;

[0047] Figure 8 is a schematic diagram of the circuit structure of another compensation circuit provided in an embodiment of this application;

[0048] Figure 9 is a schematic diagram of the circuit structure of another compensation circuit provided in an embodiment of this application;

[0049] Figure 10 is a schematic diagram of a circuit board assembly provided in an embodiment of this application;

[0050] Figure 11 is a schematic diagram of the structure of another electronic device provided in an embodiment of this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0052] In the following embodiments of this application, the terms "first," "second," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0053] In the embodiments of this application, "upper", "lower", "left" and "right" are not limited to the orientation of the components in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0054] In this application, unless the context otherwise requires, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to," throughout the specification and claims. In the description, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "exemplary," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0055] In describing some embodiments, the terms "coupled," "connected," and their derivatives may be used. For example, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. Similarly, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. However, the term "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0056] This application provides an electronic device. This electronic device can be, for example, a consumer electronics product with a display function, a home electronics product, an in-vehicle electronics product, or a financial electronics product. Consumer electronics products include mobile phones, tablets, laptops, e-readers, personal computers (PCs), personal digital assistants (PDAs), desktop monitors, smart wearable products (e.g., smartwatches, smart bracelets), virtual reality (VR) electronic devices, augmented reality (AR) electronic devices, drones, etc. Home electronics products include smart door locks, televisions, remote controls, refrigerators, and rechargeable small household appliances (e.g., soymilk makers, robot vacuum cleaners), etc. In-vehicle electronic products include in-vehicle navigation systems, in-vehicle high-density digital video discs (DVDs), etc. Financial electronics products include automated teller machines (ATMs), self-service electronic devices, etc. This application does not impose any special limitations on the specific form of the above-mentioned electronic devices.

[0057] Figure 1 is a structural block diagram of an electronic device. As shown in Figure 1, the electronic device 100 may include a display panel 10, a main circuit board 20, a first circuit board (i.e., a TCON board) 30, and at least one source driver 40.

[0058] Figure 2 is a schematic diagram of the structure of the display panel 10 provided in an embodiment of this application. As shown in Figure 2, the display panel 10 includes multiple subpixels P, multiple data lines DL, and multiple power supply lines 11. The multiple subpixels P can be classified into multiple types. For example, the multiple subpixels P can be classified into red subpixels, blue subpixels, and green subpixels. Alternatively, the multiple subpixels P can be classified into red subpixels, blue subpixels, green subpixels, and white subpixels, etc.

[0059] For example, multiple subpixels P can be arranged in an array. Multiple subpixels P located in the same row are arranged along a first direction X, and multiple subpixels P located in the same column are arranged along a second direction Y. The first direction X and the second direction Y intersect. For example, the first direction X and the second direction Y can be perpendicular.

[0060] Multiple data lines DL extend along the second direction Y, and multiple sub-pixels P located in the same column are connected to the same data line DL. The data line DL is used to transmit data voltage signals V to the sub-pixels P connected to it. dataMultiple power supply voltage lines 11 also extend along the second direction Y. One power supply voltage line 11 can connect multiple sub-pixels P in a column. Alternatively, one power supply voltage line 11 can connect two adjacent columns of sub-pixels P in the first direction X. The power supply voltage lines 11 are used to transmit power supply voltage signals V to the sub-pixels P connected to them. dd .

[0061] The display panel 10 may further include multiple grid lines (not shown) extending along a first direction, with multiple sub-pixels P located in the same row connected to the same grid line. The grid line is used to transmit control signals to the sub-pixels P connected thereto, the control signals being used to control whether the sub-pixels P emit light.

[0062] Figure 3 is a circuit structure diagram of a sub-pixel P provided in an embodiment of this application. As shown in Figure 3, the sub-pixel P includes a connected light-emitting device 101 and a pixel driving circuit 102. The pixel driving circuit 102 is used to provide a driving current I to the light-emitting device 101 to drive the light-emitting device 101 to emit light. In Figure 3, the direction of the driving current I is indicated by a "dashed line with an arrow". The larger the driving current I, the brighter the light-emitting device 101.

[0063] For example, the light-emitting device 101 is an organic light-emitting diode (OLED).

[0064] For example, the pixel driving circuit 102 includes a first transistor T1 and a second transistor T2. The gate of the first transistor T1 is connected to a gate line and is used to receive a control signal V. gate The first terminal of the first transistor T1 is connected to the data line to receive the data voltage signal V. data The second terminal of the first transistor T1 is connected to the gate of the second transistor T2. The first terminal of the second transistor T2 is connected to the power supply voltage line to receive the power supply voltage signal V. dd The second transistor T2 is connected to the input terminal of the light-emitting device 101. The output terminal of the light-emitting device 101 can be grounded or connected to the low-level voltage terminal V. ss Connected.

[0065] It is understood that although Figure 3 only shows the case where the pixel driving circuit 102 includes two transistors (i.e., the first transistor T1 and the second transistor T2), the circuit structure of the pixel driving circuit 102 in this embodiment is not limited to this. Figure 3 is illustrated with the example that both the first transistor T1 and the second transistor T2 are P-type transistors, but the first transistor T1 and the second transistor T2 can also be N-type transistors.

[0066] For example, the first transistor T1 and the second transistor T2 can both be thin film transistors (TFTs).

[0067] During the operation of subpixel P, the first transistor T1 operates under control signal V. gate Under the control of the circuit, the data voltage signal V is turned on. data The data is transmitted to the gate of the second transistor T2 via the first transistor T1. The data voltage signal V... data Under the control of the second transistor T2, the data voltage signal V is turned on. data and power supply voltage signal V dd Under the influence of the light source, a driving current I is generated. The driving current I flows into the light-emitting device 101, causing the light-emitting device 101 to emit light.

[0068] The drive current I satisfies the formula: Where μ is the carrier mobility of the second transistor T2; C ox The channel capacitance per unit area of ​​the second transistor T2; This represents the channel width-to-length ratio of the second transistor T2. When the second transistor T2 (P-type transistor) is turned on, the data voltage signal V... data The voltage value is less than the power supply voltage signal V. dd The voltage value, Vdata-Vdd, is negative. Thus, the power supply voltage signal V... dd The smaller the voltage value, the smaller the drive current I; the power supply voltage signal V dd The higher the voltage value, the larger the drive current I.

[0069] Referring again to Figure 1, the main circuit board 20 includes a power supply circuit 21, which is a power management integrated circuit (PMIC). The power supply circuit 21 is connected to multiple power supply voltage lines of the display panel 10 and is used to provide power voltage signals V to the multiple power supply voltage lines 11. dd .

[0070] The main circuit board 20 may also include a system-on-chip (SoC) 22. The SoC 22 is a system or product formed by combining multiple integrated circuits with specific functions on a single chip, containing a complete hardware system and its embedded software. For example, the aforementioned SoC can be an application processor (AP). The application processor can generate corresponding timing control signals and display data based on external signal sources.

[0071] The electronic device 100 may include a timing controller (TCON) 31, and a power supply circuit 32 is disposed on the first circuit board 30. The timing controller 31 can receive multiple timing control signals and display data from the system-on-a-chip 22 (application processor), convert the multiple timing control signals into control signals that can be recognized by the source driver 40, output them to the source driver 40, and convert the display data into data signals and output them to the source driver 40.

[0072] For example, the electronic device 100 may further include a power supply circuit 32 disposed on the first circuit board 30. The power supply circuit 32 may also be a power management integrated circuit. For example, the power supply circuit 32 may be a direct current-to-direct current converter (DC-DC converter).

[0073] For example, the timing controller 31 can also be connected to the power supply circuit 32 to control the power supply circuit 32 to generate a gamma signal V. GM The power supply circuit 32 will transmit the gamma signal V GM The output is sent to the source driver 40. The source driver 40 can output based on the gamma signal V. GM Generate data voltage signal V data It is understandable that, in the case of electronic device 100 including multiple source drivers 40, the gamma signal V GM It will be transmitted to each source driver 40.

[0074] Among them, the gamma signal V GM Including multiple. Gamma signal V GM The more numerous the data, the greater the generated data voltage signal V. data The more detailed the signal, the higher the quality of the displayed image. For example, the gamma signal V... GM It includes a first gamma signal and a second gamma signal, wherein the first gamma signal is a high-level signal and the second gamma signal is a low-level signal.

[0075] The electronic device 100 may include one or more source drivers 40. The source drivers 40 are connected to multiple data lines in the display panel 10, providing data voltage signals V to the multiple data lines. data When the electronic device 100 includes multiple source drivers 40, the number of source drivers 40 can be set according to the number of subpixels in the display panel 10. Figure 1 shows an example of an electronic device 100 including four source drivers 40.

[0076] As exemplarily shown in FIG1, the electronic device 100 may further include one or more flexible printed circuits (FPCs) 50 for carrying source drivers 40. One end of the flexible printed circuit 50 may be connected to one end of the display panel, and the other end of the flexible printed circuit 50 may be connected to one end of the first circuit board 30.

[0077] For example, as shown in Figure 1, the electronic device 100 may include a flexible circuit board 50 and at least one source driver 40, with all source drivers 40 disposed on a single flexible circuit board 50. Alternatively, the electronic device 100 may include multiple flexible circuit boards 50 and multiple source drivers 40, with at least one source driver 40 disposed on each flexible circuit board 50.

[0078] The source driver 40 can be mounted on the flexible circuit board 50 using chip-on-film (COF) technology.

[0079] For the display panel, the power supply line 11 is relatively long, and the power supply voltage signal V... dd A voltage drop will be generated on power supply line 11, resulting in a voltage signal V across power supply line 11. dd Due to the voltage difference, there are brightness differences between different sub-pixels P connected to the two ends of the same power supply voltage line 11. For medium and large-sized display panels, the power supply voltage line 11 is longer, and the brightness differences between different sub-pixels P connected to the two ends of the same power supply voltage line 11 are also greater.

[0080] Based on this, this application provides another electronic device 200. Figure 4 is a schematic diagram of the structure of the other electronic device 200 provided in this application.

[0081] Unlike the electronic device 100 shown in Figure 1, the electronic device 200 shown in Figure 4 includes, in addition to the display panel 10, main circuit board 20, first circuit board 30, source driver 40 and flexible circuit board 50, a second circuit board 60, a first connecting circuit board 70 and a second connecting circuit board 80.

[0082] As shown in Figure 4, the display panel 10 has a first end 12 and a second end 13 opposite to each other in the extension direction Y of the power supply voltage line. A first circuit board 30 is connected to the first end 12 of the display panel 10 via a flexible circuit board 50, and a second circuit board 60 is connected to the second end 13 of the display panel 10. A first connecting circuit board 70 connects the main circuit board 20 and the first circuit board 30, and a second connecting circuit board 80 connects the main circuit board 20 and the second circuit board 60.

[0083] For example, the first connecting circuit board 70 and the first circuit board 30 can be connected via a board-to-board (BTB) connector. The first connecting circuit board 70 and the main circuit board 20 can be connected via a BTB connector. The second connecting circuit board 80 and the main circuit board 20 can be connected via a BTB connector, and the second connecting circuit board 80 and the second circuit board 60 can be connected via a BTB connector.

[0084] For example, the flexible circuit board 50 can be bonded to the display panel 10, and the flexible circuit board 50 can be bonded to the first circuit board 30. The second circuit board 60 can be bonded to the display panel 10.

[0085] The first circuit board 30 includes a first power connection line 33, and the second circuit board 60 includes a second power connection line 61. Both the first power connection line 33 and the second power connection line 61 are connected to multiple power voltage lines in the display panel, providing a first power voltage signal and a second power voltage signal to both ends of the power voltage lines, respectively.

[0086] For example, the main circuit board 20 further includes a second transmission line 23 and a third transmission line 24. The first end a1 of the second transmission line 23 and the first end b1 of the third transmission line 24 are both connected to the power supply circuit 21. The first connection circuit board 70 further includes a third connection line 71, the first end c1 of which is connected to the second end a2 of the second transmission line 23, and the second end c2 of which is connected to the first power connection line 33. The second connection circuit board 80 further includes a fourth connection line 81, the first end d1 of which is connected to the second end b2 of the third transmission line 24, and the second end d2 of which is connected to the second power connection line 61.

[0087] The second transmission line 23, the third transmission line 24, the third connecting line 71, and the fourth connecting line 81 may have different line widths, thicknesses, and impedances. The materials of the second transmission line 23, the third transmission line 24, the third connecting line 71, and the fourth connecting line 81 may all include copper.

[0088] In this way, the power supply circuit 21 can transmit the first power supply voltage signal to the first power connection line 33 via the second transmission line 23 and the third connection line 71, thereby transmitting it to the power supply voltage line in the display panel. The power supply circuit 21 can transmit the second power supply voltage signal to the second power connection line 61 via the third transmission line 24 and the fourth connection line 81, thereby transmitting it to the power supply voltage line in the display panel.

[0089] Because the paths required for the first and second power supply voltage signals to travel to the power supply voltage lines of the display panel 10 are relatively long, and the currents of the first and second power supply voltage signals are relatively large, the voltage drops of the first and second power supply voltage signals are also large. As a result, the voltage values ​​of the first and second power supply voltage signals received by the sub-pixels of the display panel are relatively small, leading to a reduced driving current and lower sub-pixel brightness. Consequently, the displayed image on the display panel 10 appears darker, resulting in a poor display effect. Furthermore, for different electronic devices of the same specifications, differences in display panel loading, wiring impedance, and other factors can cause differences in the voltage drops of the first and second power supply voltage signals, leading to variations in the brightness of the display panels of different electronic devices of the same specifications and thus different display effects.

[0090] To address the aforementioned problems, this application provides a compensation circuit. Figure 5 is a structural block diagram of a compensation circuit provided in this application. As shown in Figure 5, the compensation circuit 300 includes a receiving sub-circuit 301, a first calculation sub-circuit 302, and a second calculation sub-circuit 303.

[0091] The receiving sub-circuit 301 includes an adder module 310 and a voltage follower module 320. The adder module 310 is used to receive the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The output of the adder module 310 is coupled to the input of the voltage follower module 320. The voltage follower module 320 is used to output a following voltage signal V. g .

[0092] Among them, the following voltage signal V g The voltage value and the first power supply voltage signal V dd1 The voltage value is positively correlated and follows the voltage signal V. g The voltage value and the second power supply voltage signal V dd2 The voltage value is positively correlated. That is, in the first power supply voltage signal V dd1 When the voltage value increases, it follows the voltage signal V g The voltage value also increases accordingly; in the second power supply voltage signal V dd2 When the voltage value increases, it follows the voltage signal V g The voltage value also increases accordingly.

[0093] The first calculation sub-circuit 302 is used to receive the first reference voltage V1 and the follower voltage signal V. g Output the first gamma signal V GMH First gamma signal V GMH The voltage values ​​are the first reference voltage V1 and the follower voltage signal V. g The sum of voltage values, i.e., VGMH =V1+V g The second calculation sub-circuit 303 is used to receive the second reference voltage V2 and the follower voltage signal V. g Output the second gamma signal V GML Second gamma signal V GML The voltage value is the second reference voltage V2 and the following voltage signal V. g The difference in voltage values, i.e., V GML =V g -V2.

[0094] Understandably, the values ​​of the first reference voltage V1 and the second reference voltage V2 can be designed according to actual needs. For example, the first reference voltage V1 can be greater than the second reference voltage V2.

[0095] For example, the first gamma signal V GMH The high-level signal is the second gamma signal V. GML This is a low-level signal.

[0096] The compensation circuit 300 provided in this embodiment is based on a first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The adder module 310 and the voltage follower module 320 are used to generate a following voltage signal V. g Then based on the following voltage signal V g The first gamma signal V is generated using the first computing sub-circuit 302 and the second computing sub-circuit 303. GMH Second gamma signal V GML First gamma signal V GMH The voltage values ​​are the first reference voltage V1 and the follower voltage signal V. g The sum of the voltage values ​​makes the first gamma signal V GMH It can compensate for the first power supply voltage signal V dd1 The voltage value and the second power supply voltage signal V dd2 The voltage value. Second gamma signal V GML The second reference voltage V2 and the following voltage signal V g The voltage difference makes the second gamma signal V GML It can also compensate for the first power supply voltage signal V. dd1 The voltage value and the second power supply voltage signal V dd2 The voltage value.

[0097] When the compensation circuit provided in this application embodiment is applied to an electronic device, the output terminal of the compensation circuit 300 (i.e., the output terminal of the first calculation sub-circuit and the output terminal of the second calculation sub-circuit) can be connected to the input terminal of the source driver to convert the first gamma signal V GMHSecond gamma signal V GML The signal is transmitted to the source driver. The source driver then transmits the signal based on the first gamma signal V. GMH Second gamma signal V GML Capable of generating data voltage signal V data In this way, in the data voltage signal V data The first power supply voltage signal V dd1 The voltage value and the second power supply voltage signal V dd2 The voltage value was compensated.

[0098] It is understandable that, in the case of an electronic device including multiple source drivers, the first gamma signal V provided by the compensation circuit 300 GMH Second gamma signal V GML The data voltage signal V should be transmitted to all source drivers of the electronic device to ensure that the output data voltage signal V from different source drivers is transmitted. data The first power supply voltage signal V dd1 Second power supply voltage signal V dd2 The level of compensation is the same.

[0099] In the data voltage signal V data After being input to the pixel driving circuit, the pixel circuit reacts according to the data voltage signal V. data First power supply voltage signal V dd1 Second power supply voltage signal V dd2 The driving current is generated due to the data voltage signal V. data The first power supply voltage signal V dd1 Second power supply voltage signal V dd2 The voltage value was compensated, thus eliminating the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The voltage drop affects the magnitude of the drive current, thus controlling the first power supply voltage signal V. dd1 The voltage drop and the second power supply voltage signal V dd2 The voltage drop compensation can thus improve the performance due to the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 There is a problem that the driving current is too low due to voltage drop, resulting in a dim display panel and poor display effect.

[0100] For different electronic devices of the same specifications, the first power supply voltage signal V dd1 The voltage drop and the second power supply voltage signal V dd2 The voltage drop can vary due to factors such as display panel unloading and trace impedance, resulting in brightness differences between display panels of electronic devices of the same specifications. This application embodiment utilizes a compensation circuit 300 to adjust the first power supply voltage signal V.dd1 The voltage drop and the second power supply voltage signal V dd2 Compensation is performed on the voltage drop, thereby improving or even resolving the issue of the first power supply voltage signal V in different electronic devices of the same specifications. dd1 Second power supply voltage signal V dd2 The different voltage drops cause brightness differences between display panels.

[0101] In some embodiments, following voltage signal V g The voltage value is the sum of the first product and the second product, where the first product is the first power supply voltage signal V. dd1 The product of the voltage value and the first coefficient, and the second product is the second power supply voltage signal V. dd2 The product of the voltage value and the second coefficient. Both the first and second coefficients are greater than or equal to 0, and neither the first nor the second coefficient is simultaneously 0.

[0102] This application embodiment can adjust the values ​​of the first coefficient and the second coefficient to control the following voltage signal V. g The first power supply voltage signal V dd1 The weights and the second power supply voltage signal V dd2 The weights are adjusted. The first gamma signal V GMH The voltage values ​​are the first reference voltage V1 and the follower voltage signal V. g The sum of the voltage values ​​is used to adjust the following voltage signal V. g The first power supply voltage signal V dd1 The weights and the second power supply voltage signal V dd2 The weights can affect the first gamma signal V GMH The first power supply voltage signal V dd1 The weights and the second power supply voltage signal V dd2 The weights of the second gamma signal V. GML The second reference voltage V2 and the following voltage signal V g The difference in voltage values ​​is used to adjust the follower voltage signal V. g The first power supply voltage signal V dd1 The weights and the second power supply voltage signal V dd2 The weights can affect the second gamma signal V GML The first power supply voltage signal V dd1 The weights and the second power supply voltage signal V dd2 The weight.

[0103] Due to the data voltage signal V data It is based on the first gamma signal V GMH Second gamma signal V GMLTherefore, adjusting the values ​​of the first and second coefficients can affect the data voltage signal V. data The first power supply voltage signal V dd1 The weights and the second power supply voltage signal V dd2 The weight of, that is, the influence on the data voltage signal V data The first power supply voltage signal V dd1 The compensation force and the second power supply voltage signal V dd2 The level of compensation.

[0104] This allows the compensation circuit 300 to be adapted to different electronic devices, improving its applicability. Simultaneously, for a single electronic device, it is configured to adjust the first power supply voltage signal V. dd1 The compensation force and the second power supply voltage signal V dd2 The first and second coefficients of the compensation strength can also be determined from the first power supply voltage signal V. dd1 The voltage drop and the second power supply voltage signal V dd2 When the voltage drop is different, adjust the first power supply voltage signal V according to actual needs. dd1 Second power supply voltage signal V dd2 Compensation is performed to improve the compensation effect, thereby further enhancing the display effect of the display panel.

[0105] For example, the first power supply voltage signal V dd1 The voltage drop is greater than the second power supply voltage signal V. dd2 When the voltage drop is such that the first coefficient is greater than the second coefficient, the voltage signal V can be followed. g The first power supply voltage signal V dd1 The weight is relatively large, following the voltage signal V g Second power supply voltage signal V dd2 The weight is relatively small, which allows the data voltage signal V to be... data The first power supply voltage signal V dd1 The compensation is relatively strong, and the data voltage signal V data The second power supply voltage signal V dd2 The compensation is relatively small.

[0106] For example, in the first power supply voltage signal V dd1 The voltage drop is less than the second power supply voltage signal V. dd2 When the voltage drop is such that the first coefficient is less than the second coefficient, the voltage signal V can be followed. g The first power supply voltage signal V dd1 Its weight is relatively small, following the voltage signal V g Second power supply voltage signal V dd2The weight is relatively large, which allows the data voltage signal V to have a larger weight. data The first power supply voltage signal V dd1 The compensation is relatively small, and the data voltage signal V data The second power supply voltage signal V dd2 The compensation is substantial.

[0107] For example, in the first power supply voltage signal V dd1 The voltage drop is equal to the second power supply voltage signal V. dd2 When the voltage drop is, or the first power supply voltage signal V dd1 The voltage drop and the second power supply voltage signal V dd2 When the pressure drop difference is small, the first coefficient can be made equal to the second coefficient.

[0108] For example, in the first power supply voltage signal V dd1 When the voltage drop is small, the first coefficient can be 0. In the second power supply voltage signal V... dd2 When the pressure drop is small, the second coefficient can be 0.

[0109] It is understandable that the above example is based on the first power supply voltage signal V. dd1 The voltage drop and the second power supply voltage signal V dd2 The magnitude of the voltage drop is considered in the design of the first and second coefficients. In practical applications, more factors can be considered in the design of the first and second coefficients. Thus, in the first power supply voltage signal V... dd1 The voltage drop is greater than the second power supply voltage signal V. dd2 When the pressure drop is large, the first coefficient can be equal to or less than the second coefficient.

[0110] For example, both the first coefficient and the second coefficient can be 0.5.

[0111] Figure 6 is a schematic diagram of the circuit structure of the compensation circuit provided in the embodiment of this application. As shown in Figure 6, the adder module 310 may include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first operational amplifier OP1.

[0112] The first terminal of the first resistor R1 is used to receive the first power supply voltage signal V. dd1 The first terminal of the second resistor R2 is used to receive the second power supply voltage signal V. dd2The second terminals of the first resistor R1 and the second resistor R2 are both connected to the non-inverting input of the first operational amplifier OP1. The first terminal of the third resistor R3 is connected to ground (GND), and the second terminal of the third resistor R3 is connected to the inverting input of the first operational amplifier OP1. The first terminal of the fourth resistor R4 is connected to the inverting input of the first operational amplifier OP1, and the second terminal of the fourth resistor R4 and the output terminal of the first operational amplifier OP1 are both coupled to the input terminal of the voltage follower module 320.

[0113] For example, if the resistance of the first resistor R1 is r1, the resistance of the second resistor R2 is r2, the resistance of the third resistor R3 is r3, and the resistance of the fourth resistor R4 is r4, then r1, r2, r3, and r4 satisfy the formula: in, As the first coefficient, This is the second coefficient.

[0114] The first and second coefficients can be adjusted by adjusting the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4.

[0115] It is understandable that, in addition to the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, the adder module 310 may also include other resistors and capacitors. When the adder module includes other resistors, the relationship between the resistor values ​​and the first and second coefficients can be recalculated based on the characteristics of the operational amplifier (virtual short and virtual open).

[0116] In some embodiments, the voltage follower module 320 includes a voltage follower OP2. The first input terminal (non-inverting input terminal) of the voltage follower OP2 is connected to the output terminal of the adder module 310, and the second input terminal (inverting output terminal) of the voltage follower OP2 is coupled to its output terminal. The output terminal of the voltage follower OP2 is connected to the input terminals of the first calculation sub-circuit 302 and the second calculation sub-circuit 303. The voltage follower OP2 is used to receive the following voltage signal V output by the adder module 310. g It outputs a following voltage signal V to the first calculation sub-circuit 302 and the second calculation sub-circuit 303. g .

[0117] When the adder module 310 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first operational amplifier OP1, the output terminal of the adder module 310 is also the output terminal of the first operational amplifier OP1.

[0118] By setting the voltage follower OP2, the adder module 310 can be isolated from the first calculation sub-circuit 302, and the adder module 310 can also be isolated from the second calculation sub-circuit 303, thereby avoiding the influence of the first calculation sub-circuit 302 and the second calculation sub-circuit 303 on the signal operation of the adder module 310.

[0119] In this embodiment, both the adder module 310 and the voltage follower module 320 are analog circuits, receiving the follower voltage signal V output by the receiving sub-circuit 301. g For analog signals, due to their precise resolution and ease of processing, a voltage follower signal V is used. g Generate the first gamma signal V GMH Second gamma signal V GML At that time, the first gamma signal V can be increased. GMH Second gamma signal V GML The accuracy of the compensation circuit 300 is ensured to match the first power supply voltage signal V. dd1 The voltage drop and the second power supply voltage signal V dd2 The pressure drop compensation effect.

[0120] In some embodiments, continuing to refer to FIG6, the first computing sub-circuit 302 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a third operational amplifier OP3.

[0121] The first terminal of the fifth resistor R5 is used to receive the first reference voltage V1, and the first terminal of the sixth resistor R6 is used to receive the follower voltage signal V. g The second terminals of the fifth resistor R5 and the sixth resistor R6 are both connected to the non-inverting input of the third operational amplifier OP3. The first terminal of the seventh resistor R7 is connected to ground (GND), and the second terminal of the seventh resistor R7 is connected to the inverting input of the third operational amplifier OP3. The first terminal of the eighth resistor R8 is connected to the inverting input of the third operational amplifier OP3, and the second terminal of the eighth resistor R8 is connected to the output of the third operational amplifier OP3.

[0122] In this configuration, the resistance of the fifth resistor R5 is the same as that of the sixth resistor R6, and the resistance of the seventh resistor R7 is the same as that of the eighth resistor R8. This ensures that the first gamma signal V... GMH The first reference voltage V1 and the following voltage signal V g The sum of voltage values.

[0123] In this embodiment, the first calculation sub-circuit 302 is an analog circuit, and the first gamma signal V output by the first calculation sub-circuit 302 is... GMHAs an analog signal, analog signals have the advantages of precise resolution and ease of processing. Using the first gamma signal V... GMH When generating the data voltage signal, it is beneficial to improve the accuracy of the data voltage signal, thereby improving the accuracy of the data voltage signal relative to the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The accuracy of compensation.

[0124] In some examples, a component (e.g., a resistor, capacitor, etc.) can be connected in series at the output of the third operational amplifier OP3, serving as a load for OP3. By adjusting the load parameters of the third operational amplifier OP3, a first gamma signal V can be generated for the first computational sub-circuit 302. GMH The speed is adjusted, thereby adjusting the compensation circuit 300's response to the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The speed of compensation.

[0125] In some embodiments, as shown in FIG6, the second calculation sub-circuit 303 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a fourth operational amplifier OP4.

[0126] The first terminal of the ninth resistor R9 is used to receive the following voltage signal V. g The first terminal of the tenth resistor R10 is connected to ground (GND). The second terminals of both the ninth resistor R9 and the tenth resistor R10 are connected to the non-inverting input of the fourth operational amplifier OP4. The first terminal of the eleventh resistor R11 receives the second reference voltage V2, and its second terminal is connected to the inverting input of the fourth operational amplifier OP4. The first terminal of the twelfth resistor R12 is connected to the inverting input of the fourth operational amplifier OP4, and its second terminal is connected to the output of the fourth operational amplifier OP4.

[0127] In this configuration, the resistance of the ninth resistor R9 is the same as that of the tenth resistor R10, and the resistance of the eleventh resistor R11 is the same as that of the twelfth resistor R12. This allows the second gamma signal V to... GML The second reference voltage V2 and the following voltage signal V g The difference in voltage values.

[0128] In this embodiment, the second calculation sub-circuit 303 is an analog circuit, and the second gamma signal V output by the second calculation sub-circuit 303 is... GML As an analog signal, analog signals have the advantages of precise resolution and ease of processing. When using the second gamma signal V... GMLWhen generating the data voltage signal, it is beneficial to improve the accuracy of the data voltage signal, thereby improving the accuracy of the data voltage signal relative to the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The accuracy of compensation.

[0129] In some examples, a component (e.g., a resistor, capacitor, etc.) can be connected in series at the output of the fourth operational amplifier OP4, serving as a load for OP4. By adjusting the load parameters of the fourth operational amplifier OP4, a second gamma signal V can be generated for the second computational sub-circuit 303. GML The speed is adjusted, thereby adjusting the compensation circuit 300's response to the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 The speed of compensation.

[0130] Figure 7 is a structural block diagram of another compensation circuit 300 provided in an embodiment of this application. In some embodiments, as shown in Figure 7, the compensation circuit 300 further includes a generation sub-circuit 304, and the input terminals of the first calculation sub-circuit 302 and the second calculation sub-circuit 303 are both connected to the output terminal of the generation sub-circuit 304. The generation sub-circuit 304 is used to output a first reference voltage V1 to the first calculation sub-circuit 302 and a second reference voltage V2 to the second calculation sub-circuit 303.

[0131] In some examples, as shown in Figure 7, the generation sub-circuit 304 includes a first voltage divider unit 330 and a second voltage divider unit 340. The input terminal of the first voltage divider unit 330 is used to receive a reference voltage V0, and the output terminal of the first voltage divider unit 330 outputs a first reference voltage V1. The input terminal of the second voltage divider unit 340 is used to receive the reference voltage V0, and the output terminal of the second voltage divider unit 340 outputs a second reference voltage V2.

[0132] Figure 8 is a circuit structure diagram of another compensation circuit 300 provided in an embodiment of this application. Exemplarily, as shown in Figure 8, the first voltage divider unit 330 includes a connected thirteenth resistor R13 and a fourteenth resistor R14. The first terminal of the thirteenth resistor R13 is used to receive a reference voltage V0. The second terminal of the thirteenth resistor R13 is connected to the first terminal of the fourteenth resistor R14, and the second terminal of the fourteenth resistor R14 is connected to the ground terminal GND. Both the second terminal of the thirteenth resistor R13 and the first terminal of the fourteenth resistor R14 are coupled to the input terminal of the first calculation sub-circuit 302.

[0133] In this embodiment, a voltage divider circuit is constructed using a thirteenth resistor R13 and a fourteenth resistor R14 to generate a first reference voltage V1 from a reference voltage V0. The voltage value of the first reference voltage V1 is less than the voltage value of the reference voltage V0. The resistance values ​​of the thirteenth resistor R13 and the fourteenth resistor R14 can be adjusted according to the magnitudes of the reference voltage V0 and the first reference voltage V1.

[0134] As exemplarily shown in FIG8, the second voltage divider unit 340 includes a fifteenth resistor R15 and a sixteenth resistor R16 connected together. The first terminal of the fifteenth resistor R15 is used to receive a reference voltage V0, and the second terminal of the fifteenth resistor R15 is connected to the first terminal of the sixteenth resistor R16. The second terminal of the sixteenth resistor R16 is connected to the ground terminal GND. The second terminal of the fifteenth resistor R15 and the first terminal of the sixteenth resistor R16 are both coupled to the input terminal of the second calculation sub-circuit 303.

[0135] In this embodiment, a voltage divider circuit is constructed using a fifteenth resistor R15 and a sixteenth resistor R16 to generate a second reference voltage V2 from a reference voltage V0. The voltage value of the second reference voltage V2 is less than the voltage value of the reference voltage V0. The resistance values ​​of the fifteenth resistor R15 and the sixteenth resistor R16 can be adjusted according to the magnitudes of the reference voltage V0 and the second reference voltage V2.

[0136] Figure 9 is a schematic diagram of the circuit structure of another compensation circuit provided in an embodiment of this application. In some other examples, as shown in Figure 9, the generating sub-circuit 304 includes a seventeenth resistor R17, an eighteenth resistor R18, and a nineteenth resistor R19. The first terminal of the seventeenth resistor R17 is used to receive a reference voltage V0. The second terminal of the seventeenth resistor R17 is connected to the first terminal of the eighteenth resistor R18. The second terminal of the eighteenth resistor R18 is connected to the first terminal of the nineteenth resistor R19. The second terminal of the nineteenth resistor R19 is connected to the ground terminal GND.

[0137] The second end of the seventeenth resistor R17 and the first end of the eighteenth resistor R18 are both coupled to the input of the first calculation sub-circuit 302. The second end of the eighteenth resistor R18 and the first end of the nineteenth resistor R19 are both coupled to the input of the second calculation sub-circuit 303.

[0138] Among them, the second end of the seventeenth resistor R17 (the first end of the eighteenth resistor R18) is used to output the first reference voltage V1, and the second end of the eighteenth resistor R18 (the first end of the nineteenth resistor R19) is used to output the second reference voltage V2.

[0139] In this embodiment, a voltage divider circuit is constructed using the seventeenth resistor R17, the eighteenth resistor R18, and the nineteenth resistor R19. This ensures that the node voltage between the seventeenth resistor R17 and the eighteenth resistor R18 (i.e., the first reference voltage V1) is less than the reference voltage V0, and the node voltage between the eighteenth resistor R18 and the nineteenth resistor R19 (i.e., the second reference voltage V2) is less than the reference voltage V0. By adjusting the resistance values ​​of the seventeenth resistor R17, the eighteenth resistor R18, and the nineteenth resistor R19, the voltage division of these three resistors can be adjusted, thereby adjusting the magnitudes of the first reference voltage V1 and the second reference voltage V2.

[0140] In some other examples, the generating sub-circuit 304 may include two voltage sources, which are used to provide a first reference voltage and a second reference voltage, respectively.

[0141] As can be seen from the above embodiments, the compensation circuit 300 provided in this application all uses analog circuit elements. The compensation circuit 300 receives the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 Then, the first gamma signal V can be automatically generated. GMH Second gamma signal V GML and the first gamma signal V GMH Second gamma signal V GML The data is transmitted to the source driver to achieve automatic voltage compensation (AVC).

[0142] Furthermore, the compensation circuit 300 is based on the first power supply voltage signal V. dd1 Second power supply voltage signal V dd2 Generate the first gamma signal V GMH Second gamma signal V GML The speed can be relatively fast, the first gamma signal V GMH Second gamma signal V GML With the first power supply voltage signal V dd1 Second power supply voltage signal V dd2 The rate of change is also relatively fast, which helps to improve the compensation circuit 300's response to the first power supply voltage signal V. dd1 The voltage drop, and the second power supply voltage signal V dd2 The compensation speed of the voltage drop is fast. When the compensation circuit 300 is applied to electronic devices, the compensation speed of the compensation circuit 300 is fast, which is beneficial to improving the display effect of the display panel.

[0143] Compared with the related technologies that use digital circuits such as sampling circuits and processors to compensate for voltage drop in each subpixel of the display panel, the embodiments of this application do not require the addition of digital circuits such as sampling circuits and processors, and can also save costs.

[0144] This application also provides a circuit board assembly 400. Figure 10 is a schematic diagram of the structure of the circuit board assembly 400 provided in this application embodiment. As shown in Figure 10, the circuit board assembly 400 includes a first circuit board 30 and a compensation circuit 300.

[0145] The first circuit board 30 includes a first power connection line 33 and a feedback signal line 34. The compensation circuit 300 is located on the first circuit board 30 and connected to the first power connection line 33 and the feedback signal line 34. The first power connection line 33 is used to provide a first power supply voltage signal V to the compensation circuit 300. dd1 Feedback signal line 34 is used to provide a second power supply voltage signal V to the compensation circuit 300. dd2 .

[0146] The first power supply connection line 33 can be connected to the first input terminal of the receiving sub-circuit 301 in the compensation circuit 300 to provide the receiving sub-circuit 301 with the first power supply voltage signal V. dd1 Feedback signal line 34 can be connected to the second input terminal of the receiver sub-circuit 301 in the compensation circuit 300 to provide the receiver sub-circuit 301 with the second power supply voltage signal V. dd2 .

[0147] For example, the materials of the first power connection line 33 and the feedback signal line 34 can be the same. For instance, both the materials of the first power connection line 33 and the feedback signal line 34 can include copper. It is understood that the linewidth of the first power connection line 33 can be the same as or different from the linewidth of the feedback signal line 34. The thickness of the first power connection line 33 can be the same as or different from the thickness of the feedback signal line 34.

[0148] In some embodiments, the circuit board assembly 400 further includes a power supply circuit 32 located on the first circuit board 30 and connected to the compensation circuit 300. The power supply circuit 32 is used to provide a reference voltage V0 to the compensation circuit 300. The compensation circuit 300 is also used to generate a first reference voltage V1 and a second reference voltage V2 based on the reference voltage V0.

[0149] As shown in Figure 10, the compensation circuit 300 may include a generation sub-circuit 304, the input terminal of which is connected to the output terminal of the power supply circuit 32. The first output terminal of the generation sub-circuit 304 is connected to the input terminal of the first calculation sub-circuit 302, and the second output terminal of the generation sub-circuit 304 is connected to the input terminal of the second calculation sub-circuit 303. The generation sub-circuit 304 can generate a first reference voltage V1 and a second reference voltage V2 based on the reference voltage V0, and outputs the first reference voltage V1 to the first calculation sub-circuit 302 and the second reference voltage V2 to the second calculation sub-circuit 303.

[0150] In this embodiment, the reference voltage V0 is provided by the power supply circuit 32, thereby eliminating the need to introduce an additional voltage source, which helps to simplify the structure of the circuit board assembly 400 and reduce costs.

[0151] In some embodiments, continuing to refer to FIG10, the circuit board assembly 400 further includes a timing controller 31. The timing controller 31 is connected to the power supply circuit 32 and is used to control the power supply circuit 32 to provide a reference voltage V0 to the compensation circuit 300.

[0152] Figure 11 is a structural schematic diagram of another electronic device 500 provided in an embodiment of this application. As shown in Figure 11, the electronic device 500 includes a display panel 10, a second circuit board 60, and a circuit board assembly 400 provided in the above embodiment.

[0153] The circuit board assembly 400 includes a compensation circuit 300 and a first circuit board 30, with the compensation circuit 300 disposed on the first circuit board 30.

[0154] Referring to FIG2, the display panel 10 includes a plurality of power supply voltage lines 11 extending along a second direction Y. Referring to FIG11, the display panel 10 has a first end 12 and a second end 13 opposite to each other in the extension direction (i.e., the second direction Y) of the power supply voltage lines 11.

[0155] The circuit board assembly 400 is connected to the first end 12 of the display panel 10. The first power connection line 33 of the circuit board assembly 400 is connected to the first end of multiple power voltage lines.

[0156] The second circuit board 60 is connected to the second end 13 of the display panel 10. The second circuit board 60 includes a second power connection line 61, which is connected to the second end of a plurality of power voltage lines. The second power connection line 61 is also connected to the feedback signal line 34 of the circuit board assembly 400.

[0157] In the electronic device 500 provided in this application embodiment, the first power connection line 33 in the circuit board assembly 400 is connected not only to the first end of the power voltage line in the display panel 10, but also to the compensation circuit 300. The first power connection line 33 can transmit the first power voltage signal that is about to be transmitted to the power voltage line to the compensation circuit 300, so that the compensation circuit 300 receives the first power voltage signal after a voltage drop. The second power connection line 61 is connected not only to the second end of the power voltage line in the display panel 10, but also to the feedback signal line 34 in the circuit board assembly 400. The second power connection line 61 can transmit the second power voltage signal that is about to be transmitted to the power voltage line to the compensation circuit 300, so that the compensation circuit 300 receives the second power voltage signal after a voltage drop.

[0158] In this way, the first and second gamma signals generated by the compensation circuit 300 compensate for the voltage drops in the first and second power supply voltage signals, respectively. Similarly, the data voltage signal generated by the source driver based on the first and second gamma signals also compensates for the voltage drops in both signals. When a sub-pixel in the display panel receives the voltage drops in both signals, the data voltage signal compensates for the voltage drops, thus eliminating the impact of these voltage drops on the drive current and ensuring the display panel's brightness.

[0159] It is understood that, in addition to the display panel 10, the second circuit board 60, and the circuit board assembly 400 provided in the above embodiments, the electronic device 500 also includes a main circuit board 20, a source driver 40, a flexible circuit board 50, a first connecting circuit board 70, and a second connecting circuit board 80. The descriptions of the main circuit board 20, the source driver 40, the flexible circuit board 50, the first connecting circuit board 70, and the second connecting circuit board 80 can be found in the above embodiments and will not be repeated here.

[0160] Unlike the electronic device 200 provided in the previous embodiment, in order to connect the second power connection line 61 to the feedback signal line 34, as shown in FIG11, the main circuit board 20 includes a first transmission line 25, the first connection circuit board 70 includes a first connection line 72, and the second connection circuit board 80 includes a second connection line 82.

[0161] It is understandable that although different traces located on the same circuit board (e.g., main circuit board, first circuit board, first connecting circuit board and second connecting circuit board) in Figure 11 use the same line type, different traces on the same circuit board have different functions, and their line width, thickness and impedance may also be different.

[0162] Specifically, the first end f1 of the first connecting line 72 is connected to the feedback signal line 34, and the second end f2 of the first connecting line 72 is connected to the first end e1 of the first transmission line 25. The first end g1 of the second connecting line 82 is connected to the second end e2 of the first transmission line 25, and the second end g2 of the second connecting line 82 is connected to the second power supply connecting line 61.

[0163] The second power connection line 61 can be connected to the feedback signal line 34 through the first transmission line 25, the first connection line 72, and the second connection line 82, so that the feedback signal line 34 can collect the second power voltage signal on the second power connection line 61.

[0164] For example, the linewidth of the first transmission line 25 is different from the linewidth of the first connecting line 72, and the linewidth of the first transmission line 25 is also different from the linewidth of the second connecting line 82. The thickness of the first transmission line 25 is different from the thickness of the first connecting line 72, and the thickness of the first transmission line 25 is also different from the thickness of the second connecting line 82.

[0165] For example, the materials of the first transmission line 25, the first connecting line 72, and the second connecting line 82 can all be copper.

[0166] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0167] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A compensation circuit, characterized in that, include: The receiving sub-circuit includes an adder module and a voltage follower module. The adder module is used to receive a first power supply voltage signal and a second power supply voltage signal. The output terminal of the adder module is coupled to the input terminal of the voltage follower module. The voltage follower module is used to output a following voltage signal. A first calculation sub-circuit is used to receive a first reference voltage and the following voltage signal, and output a first gamma signal; the voltage value of the first gamma signal is the sum of the voltage values ​​of the first reference voltage and the following voltage signal. The second calculation sub-circuit is used to receive the second reference voltage and the following voltage signal, and output a second gamma signal; the voltage value of the second gamma signal is the difference between the voltage value of the second reference voltage and the voltage value of the following voltage signal.

2. The compensation circuit according to claim 1, characterized in that, The addition module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier; Wherein, the first end of the first resistor is used to receive the first power supply voltage signal, the first end of the second resistor is used to receive the second power supply voltage signal, and the second ends of the first resistor and the second end of the second resistor are both connected to the non-inverting input terminal of the first operational amplifier. The first end of the third resistor is connected to the ground terminal, and the second end of the third resistor is connected to the inverting input terminal of the first operational amplifier. The first end of the fourth resistor is connected to the inverting input of the first operational amplifier, and the second end of the fourth resistor and the output of the first operational amplifier are both coupled to the input of the voltage follower module.

3. The compensation circuit according to claim 1 or 2, characterized in that, The voltage follower module includes a voltage follower, the first input terminal of which is connected to the output terminal of the adder module, and the second input terminal of which is coupled to the output terminal of the voltage follower; the output terminal of the voltage follower is connected to the input terminals of the first calculation sub-circuit and the second calculation sub-circuit. The voltage follower is used to receive the following voltage signal output by the adder module and output the following voltage signal to the first calculation sub-circuit and the second calculation sub-circuit.

4. The compensation circuit according to any one of claims 1 to 3, characterized in that, The voltage value of the following voltage signal is the sum of a first product and a second product. The first product is the product of the voltage value of the first power supply voltage signal and a first coefficient, and the second product is the product of the voltage value of the second power supply voltage signal and a second coefficient. Wherein, both the first coefficient and the second coefficient are greater than or equal to 0, and the first coefficient and the second coefficient are not both 0 at the same time.

5. The compensation circuit according to any one of claims 1 to 4, characterized in that, The first computing sub-circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a third operational amplifier; The first end of the fifth resistor is used to receive the first reference voltage, and the first end of the sixth resistor is used to receive the following voltage signal; the second ends of the fifth resistor and the sixth resistor are both connected to the non-inverting input of the third operational amplifier. The first end of the seventh resistor is connected to the ground terminal, and the second end of the seventh resistor is connected to the inverting input terminal of the third operational amplifier. The first end of the eighth resistor is connected to the inverting input of the third operational amplifier and the second end of the seventh resistor, and the second end of the eighth resistor is connected to the output of the third operational amplifier. The fifth resistor has the same resistance value as the sixth resistor, and the seventh resistor has the same resistance value as the eighth resistor.

6. The compensation circuit according to any one of claims 1 to 5, characterized in that, The second calculation sub-circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a fourth operational amplifier; The first end of the ninth resistor is used to receive the following voltage signal, the first end of the tenth resistor is connected to the ground terminal, and the second ends of both the ninth and tenth resistors are connected to the non-inverting input terminal of the fourth operational amplifier. The first terminal of the eleventh resistor is used to receive the second reference voltage, and the second terminal of the eleventh resistor is connected to the inverting input terminal of the fourth operational amplifier. The first end of the twelfth resistor is connected to the inverting input of the fourth operational amplifier and the second end of the eleventh resistor, and the second end of the twelfth resistor is connected to the output of the fourth operational amplifier. The ninth resistor has the same resistance value as the tenth resistor, and the eleventh resistor has the same resistance value as the twelfth resistor.

7. The compensation circuit according to any one of claims 1 to 6, characterized in that, The compensation circuit further includes a generation sub-circuit, wherein the input terminals of the first calculation sub-circuit and the second calculation sub-circuit are both connected to the output terminal of the generation sub-circuit; the generation sub-circuit is used to output the first reference voltage to the first calculation sub-circuit and the second reference voltage to the second calculation sub-circuit.

8. The compensation circuit according to claim 7, characterized in that, The generating sub-circuit includes a first voltage divider unit and a second voltage divider unit; The input terminal of the first voltage divider unit is used to receive the reference voltage, and the output terminal of the first voltage divider unit outputs the first reference voltage; The input terminal of the second voltage divider unit is used to receive the reference voltage, and the output terminal of the second voltage divider unit outputs the second reference voltage.

9. The compensation circuit according to claim 8, characterized in that, The first voltage divider unit includes a thirteenth resistor and a fourteenth resistor connected together. The first end of the thirteenth resistor is used to receive the reference voltage. The second end of the thirteenth resistor is connected to the first end of the fourteenth resistor, and the second end of the fourteenth resistor is connected to the ground terminal. The second end of the thirteenth resistor and the first end of the fourteenth resistor are both coupled to the input terminal of the first calculation sub-circuit. The second voltage divider unit includes a fifteenth resistor and a sixteenth resistor connected together. The first end of the fifteenth resistor is used to receive the reference voltage. The second end of the fifteenth resistor is connected to the first end of the sixteenth resistor. The second end of the sixteenth resistor is connected to the ground terminal. The second end of the fifteenth resistor and the first end of the sixteenth resistor are both coupled to the input terminal of the second calculation sub-circuit.

10. The compensation circuit according to claim 7, characterized in that, The generating sub-circuit includes a seventeenth resistor, an eighteenth resistor, and a nineteenth resistor; The first end of the seventeenth resistor is used to receive the reference voltage, the second end of the seventeenth resistor is connected to the first end of the eighteenth resistor, the second end of the eighteenth resistor is connected to the first end of the nineteenth resistor, and the second end of the nineteenth resistor is connected to the ground terminal. The second end of the seventeenth resistor and the first end of the eighteenth resistor are both coupled to the input end of the first calculation sub-circuit; The second end of the eighteenth resistor and the first end of the nineteenth resistor are both coupled to the input terminal of the second calculation sub-circuit.

11. A circuit board assembly, characterized in that, include: The first circuit board includes a first power connection line and a feedback signal line; The compensation circuit as described in any one of claims 1 to 10; the compensation circuit is located on the first circuit board and is connected to the first power supply connection line and the feedback signal line; The first power connection line is used to provide a first power voltage signal to the compensation circuit; the feedback signal line is used to provide a second power voltage signal to the compensation circuit.

12. The circuit board assembly according to claim 11, characterized in that, The circuit board assembly also includes: A power supply circuit is located on the first circuit board and connected to the compensation circuit. The power supply circuit is used to provide a reference voltage to the compensation circuit. The compensation circuit is also used to generate a first reference voltage and a second reference voltage based on the reference voltage.

13. An electronic device, characterized in that, include: The display panel includes multiple power voltage lines; the display panel has a first end and a second end opposite to each other in the extending direction of the power voltage lines; The circuit board assembly as described in claim 11 or 12 is connected to a first end of the display panel; the first power connection line of the circuit board assembly is connected to the first end of the plurality of power voltage lines. The second circuit board is connected to the second end of the display panel; the second circuit board includes a second power connection line, which is connected to the second end of the plurality of power voltage lines, and the second power connection line is also connected to the feedback signal line of the circuit board assembly.

14. The electronic device according to claim 13, characterized in that, Also includes: The main circuit board includes the first transmission line; A first connecting circuit board connects the circuit board assembly to the main circuit board; the first connecting circuit board includes a first connecting line. A second connecting circuit board is connected to the main circuit board, and the second connecting circuit board includes a second connecting line; Wherein, the first end of the first connecting line is connected to the feedback signal line, and the second end of the first connecting line is connected to the first end of the first transmission line; the first end of the second connecting line is connected to the second end of the first transmission line, and the second end of the second connecting line is connected to the second power supply connecting line.

15. The electronic device according to claim 14, characterized in that, The main circuit board also includes a power supply circuit, a second transmission line, and a third transmission line; the first end of the second transmission line and the first end of the third transmission line are both connected to the power supply circuit. The first connection circuit board further includes a third connection line, the first end of which is connected to the second end of the second transmission line, and the second end of which is connected to the first power connection line. The second connection circuit board further includes a fourth connection line, the first end of which is connected to the second end of the third transmission line, and the second end of which is connected to the second power connection line.

16. The electronic device according to any one of claims 13 to 15, characterized in that, The display panel also includes multiple data lines, and the electronic device also includes at least one source driver, which is connected to the multiple data lines. The compensation circuit of the circuit board assembly is connected to the at least one source driver, and the compensation circuit is used to output a first gamma signal and a second gamma signal to the at least one source driver.

Images