Display device

Abstract

The embodiment of the invention provides a display device which comprises a control circuit, at least two gamma modules and data driving circuits with the same number as the gamma modules, pixel driving circuits with the same number as the gamma modules are also arranged in pixel units of a display panel, and the gamma modules are electrically connected with the data driving circuits in a one-to-one correspondence mode. Each data driving circuit is electrically connected with one corresponding pixel driving circuit in each pixel unit, and is used for transmitting and processing original gray-scale values in the original display data obtained by the control circuit within the same first preset gray-scale range; each pixel driving circuit can unfold the analog data voltage corresponding to the obtained original gray-scale value in the corresponding first preset gray-scale range, the plurality of pixel driving circuits corresponding to different first preset gray-scale ranges in the pixel unit drive the same light-emitting element to emit light, and the control of each gray-scale range does not influence each other. And the light-emitting accuracy of the light-emitting element is ensured.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of display technology, and in particular, to a display device. Background Art

[0002] In recent years, due to the advantages of micro LEDs such as smaller device size, faster response speed, higher luminous efficiency, stronger stability and longer service life, the display application field based on micro LEDs has developed rapidly and has become a research hotspot for display devices.

[0003] The display panel has a plurality of pixel units arranged in an array, each pixel unit includes a plurality of pixel circuits, and the light-emitting element in each pixel circuit is driven to emit light by a pixel driving circuit. The pixel driving circuit includes a driving transistor. Due to the characteristics of the driving transistor, the problem of low grayscale being unable to be developed is prone to occur, which affects the light-emitting accuracy of the light-emitting element.

[0004] By compressing the driving time of the pixel driving circuit and increasing the analog voltage data at the same time to increase the driving current provided by the pixel driving circuit, the low gray scale can be normally developed. When the full-frame picture displayed by the display device contains both low gray scale and high gray scale, it is necessary to uniformly compress the driving time of all pixel driving circuits in the display panel. For the pixel driving circuit that obtains the analog voltage data corresponding to the high gray scale, when the corresponding increased analog voltage data exceeds the analog voltage data range that can be provided by the data driving circuit, the driving current provided by the pixel driving circuit is inaccurate, which will still affect the light-emitting accuracy of the light-emitting element. Summary of the invention

[0005] The present application provides a display device to solve the technical problem of poor light emission accuracy of a light emitting element.

[0006] An embodiment of the present application provides a display device, including a control circuit, a gamma module, a data driving circuit, and a display panel;

[0007] The display panel includes a pixel unit, and the pixel unit is at least one, including a pixel driving circuit and a light emitting element;

[0008] The number of the gamma modules, the data driving circuits, and the pixel driving circuits in each of the pixel units is the same, which is at least 2;

[0009] The control circuit is electrically connected to the gamma module and the data driving circuit, the gamma module is electrically connected to the data driving circuit in a one-to-one correspondence, each of the data driving circuits is electrically connected to a pixel driving circuit in each of the pixel units, and the pixel driving circuit in each pixel unit is electrically connected to the light emitting element;

[0010] Among them, the correspondingly connected gamma module, data driving circuit and pixel driving circuit are used to transmit and process the original grayscale values ​​in the original display data within the same first preset grayscale range, and different pixel driving circuits in the pixel unit correspond to different first preset grayscale ranges.

[0011] In the above technical solution, according to the number of divided first preset grayscale ranges, a control circuit and at least two gamma modules and data driving circuits with the same number of gamma modules are arranged in the display device, and pixel driving circuits with the same number of gamma modules are also arranged in each pixel unit of the display panel, each gamma module and the data driving circuit are electrically connected one by one, and each data driving circuit is electrically connected to a corresponding pixel driving circuit in each pixel unit, which are used to transmit and process the original grayscale value in the original display data obtained by the control circuit within the same first preset grayscale range, and each pixel driving circuit can expand the analog data voltage corresponding to the obtained original grayscale value within its corresponding first preset grayscale range. Since multiple pixel driving circuits corresponding to different first preset grayscale ranges in the pixel unit drive the same light-emitting element to emit light, and the control of each grayscale range does not affect each other, the light-emitting accuracy of the light-emitting element is guaranteed.

[0012] In a feasible implementation manner, the gamma module is provided with a plurality of binding point voltage output terminals, the data driving circuit is provided with a plurality of binding point voltage input terminals, and the plurality of binding point voltage output terminals of the gamma module and the plurality of binding point voltage input terminals of the data driving circuit are electrically connected correspondingly;

[0013] The control circuit is configured to obtain original display data, generate at least one first display data according to the original display data and at least two first preset grayscale ranges, transmit each first display data to a corresponding data driving circuit, and transmit a reference voltage of a gamma curve corresponding to the first display data to a corresponding gamma module;

[0014] Each gamma module corresponds to a different gamma curve, and the gamma module is configured to output voltage values ​​corresponding to the corresponding gamma curve at multiple preset grayscales from the multiple binding point voltage output terminals according to the reference voltage;

[0015] The data driving circuit is configured to output an analog data voltage according to the first display data and voltage values ​​corresponding to a plurality of preset grayscales provided by the gamma module;

[0016] The pixel driving circuit is configured to generate a driving signal according to the analog data voltage to drive the light emitting element to emit light.

[0017] In a feasible implementation manner, the original display data includes an original grayscale value corresponding to each pixel unit;

[0018] The control circuit is configured to obtain original display data, and generate at least one first display data according to the original display data and at least two first preset grayscale ranges, specifically including:

[0019] The control circuit is configured to obtain a frame of original display data, and divide each original grayscale value in the original display data by using a plurality of first preset grayscale ranges to obtain at least one group of original grayscale sets; each group of original grayscale sets includes at least one original grayscale value within a corresponding first preset grayscale range;

[0020] Using each group of original grayscale sets, corresponding first display data is generated; the brightness generated by the pixel driving circuit driving the light-emitting element controlled by the original grayscale value in the original grayscale set is the same as the brightness generated by the pixel driving circuit driving the light-emitting element controlled by the first grayscale value corresponding to the original grayscale value in the first display data.

[0021] In the above technical solution, when the control circuit obtains the original display data, it can generate corresponding multiple first display data according to multiple first preset grayscale ranges based on the original grayscale value in the original display data, and determine the corresponding gamma curve, and transmit the reference voltage of the above gamma curve to the corresponding gamma module, so that the gamma module provides voltage values ​​corresponding to multiple preset grayscales in the gamma curve. After obtaining the first display data, the data driving circuit uses the multiple voltage values ​​provided by the gamma module to provide the analog data voltage corresponding to the grayscale value to the corresponding pixel driving circuit to drive the light-emitting element to emit light. The control circuit uses gamma curves with different control precisions for display data in different grayscale ranges to drive the corresponding pixel driving circuit to drive the light-emitting element to emit light, thereby improving the mapping accuracy of each grayscale in the display data and the driving current generated by the pixel driving circuit, thereby improving the light-emitting accuracy of the light-emitting element.

[0022] In a feasible implementation manner, the plurality of first preset grayscale ranges include a plurality of grayscale mapping grayscale ranges, and the original grayscale value in each of the original grayscale sets is within the corresponding grayscale mapping grayscale range;

[0023] Using each set of original grayscale sets to generate corresponding first display data specifically includes:

[0024] Generate corresponding second display data using the original grayscale values ​​in each group of the original grayscale sets; each of the second display data includes an original grayscale value or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale value in the second display data is in the original grayscale set corresponding to the second display data;

[0025] Mapping each of the second display data to the first display data using a grayscale mapping table;

[0026] Wherein, each of the second display data corresponds to the same set of basic gamma curves, and each of the first display data corresponds to different sets of grayscale mapping gamma curves;

[0027] A grayscale span value of the original grayscale value in the second display data is smaller than a grayscale span value of the first grayscale value corresponding to the original grayscale value in the first display data;

[0028] The voltage value determined by the original grayscale value in the second display data in the basic gamma curve is the same as the voltage value determined by the first grayscale value corresponding to the original grayscale value in the first display data in the corresponding grayscale mapping gamma curve.

[0029] In the above technical solution, when the control circuit performs grayscale mapping, it maps the second display data generated according to the original grayscale set to the first display data while keeping the luminous brightness and voltage variation range unchanged. Since the grayscale span value of the second display data is greater than the grayscale span value of the first display data, the number of binding points within the grayscale span range of the second display data in the grayscale mapping gamma curve is greater than the number of binding points within the grayscale span range of the first display data in the basic gamma curve. The increase in the number of binding points improves the accuracy of the second display data, improves the grayscale adjustment accuracy, and thus improves the accuracy of luminescence.

[0030] In a feasible implementation manner, the plurality of first preset grayscale ranges include a plurality of voltage mapping grayscale ranges, and the original grayscale value in each of the original grayscale sets is within the corresponding voltage mapping grayscale range;

[0031] Using each set of original grayscale sets to generate corresponding first display data specifically includes:

[0032] Generate corresponding first display data using original grayscale values ​​in each group of the original grayscale sets, wherein the first display data includes original grayscale values ​​or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale values ​​in the first display data are within a voltage mapping grayscale range corresponding to the first display data;

[0033] Wherein, each of the first display data corresponds to a different group of voltage mapping gamma curves;

[0034] A voltage span value corresponding to an original grayscale value in the first display data in a corresponding voltage mapping gamma curve is greater than a voltage span value corresponding to the original grayscale value in a basic gamma curve.

[0035] In the above technical solution, in each pixel circuit, multiple pixel driving circuits are provided to drive the same light-emitting element to emit light, and the grayscale range of the original display data corresponding to each pixel driving circuit is different. For different grayscale ranges, the size of the driving tube in each pixel driving circuit is adjusted, and the voltage mapping gamma curve corresponding to each grayscale range is used to adjust the analog data voltage corresponding to each grayscale value, so that each driving tube can be normally developed within its corresponding grayscale range, and the control of each grayscale range does not affect each other, thereby ensuring the light-emitting accuracy of the light-emitting element.

[0036] An embodiment of the present application provides a display device, in which a control circuit and at least two gamma modules and a data driving circuit having the same number as the gamma modules are arranged according to the number of divided first preset grayscale ranges, and a pixel driving circuit having the same number as the gamma modules is also arranged in each pixel unit of the display panel, each gamma module and the data driving circuit are electrically connected in a one-to-one correspondence, each data driving circuit is electrically connected to a corresponding pixel driving circuit in each pixel unit, and is used to transmit and process original grayscale values ​​in the same first preset grayscale range in original display data obtained by the control circuit, and each pixel driving circuit can expand an analog data voltage corresponding to the obtained original grayscale value within its corresponding first preset grayscale range, and because multiple pixel driving circuits corresponding to different first preset grayscale ranges in the pixel unit drive the same light-emitting element to emit light, and the control of each grayscale range does not affect each other, the light-emitting accuracy of the light-emitting element is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 This is a schematic diagram of the structure of a display device provided according to an exemplary embodiment of the present application;

[0039] Figure 2 A schematic structural diagram of a display device provided according to another exemplary embodiment of the present application;

[0040] Figure 3 A set of gamma curves provided by the present application according to an exemplary embodiment;

[0041] Figure 4A and Figure 4B is the transfer characteristic curve of the driving tube;

[0042] Figure 5 is the output characteristic curve of the driving tube;

[0043] Figure 6 is the voltage-brightness curve of the LED;

[0044] Figure 7 A schematic structural diagram of a display device provided according to another exemplary embodiment of the present application;

[0045] Fig. 8A and Figure 8B Schematic diagram of the voltage mapping process of the gamma curve;

[0046] Fig. 9 A schematic diagram of a process of generating first display data during voltage mapping according to an exemplary embodiment of the present application;

[0047] Fig. 10A and Fig. 10B Schematic diagram of the grayscale mapping process of the gamma curve;

[0048] Fig.11 A schematic diagram of a process of generating first display data during grayscale mapping according to an exemplary embodiment of the present application;

[0049] Fig.12 It is a schematic diagram of the voltage-grayscale mapping process of the gamma curve;

[0050] Fig.13 A schematic diagram of a process of generating first display data during voltage-grayscale mapping according to an exemplary embodiment of the present application;

[0051] Fig.14 It is a schematic diagram of the grayscale-voltage mapping process of the gamma curve;

[0052] Fig.15 The present application is provided with a schematic diagram of a process of generating first display data during grayscale-voltage mapping according to an exemplary embodiment.

[0053] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0055] It should be noted that, in this article, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, the parts, features, and elements with the same names in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment. It should be further understood that the terms "include", "comprise" indicate the existence of features, steps, operations, elements, components, projects, types, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, types, and / or groups.

[0056] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0057] In the description of the present disclosure, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way.

[0058] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0059] In recent years, due to the advantages of micro-LEDs over AMOLEDs (Active-matrix organic light emitting diodes), such as smaller device size, faster response speed, higher luminous efficiency, stronger stability and longer service life, the display application field based on micro-LEDs has developed rapidly and has become a research hotspot for display devices.

[0060] like Figure 1 As shown, the display device includes a control circuit 10, a data driving circuit 20, a gate driving circuit 30, a display panel 40, a power supply circuit 70 and a gamma module 100. The control circuit 10 is electrically connected to the gamma module 100, the gamma module 100 is electrically connected to the data driving circuit 20, the control circuit 10 is electrically connected to the gate driving circuit 30, and the display panel 40 is electrically connected to the data driving circuit 20, the gate driving circuit 30 and the power supply circuit 70.

[0061] A plurality of pixel units 80 are arranged in the display panel 40. In the display panel 40, a power line 90, a plurality of gate lines 60 and a plurality of data lines 50 are arranged. The plurality of pixel units 80 are arranged in an array in the display panel 40, and each pixel unit 80 is located in the region where the gate line 60 and the data line 50 intersect.

[0062] The gate drive circuit 30 is electrically connected to the gate line 60. The gate drive circuit 30 is configured to obtain a clock signal and a trigger signal from the control circuit 10, and generate a gate drive signal based on the clock signal and the trigger signal, and transmit the gate drive signal to the corresponding pixel unit 80 through the gate line 60 to control the transistor in the pixel unit 80 to be turned on or off.

[0063] More specifically, the gate driver circuit 30 can be made into a separate gate driver integrated circuit (GDIC), and the gate driver circuit 30 can also be integrated into the display panel. The way of integrating the gate driver circuit 30 into the display panel is called gate-in-panel (GIP). In some cases, the GDIC can be electrically connected to the display panel 40 through the COG process (Chip on Glass), and the GDIC can be electrically connected to the display panel 40 through the COF process (Chipon Film). In the COF process, the component is electrically connected to the display panel 40 through a flexible printed circuit (FPC).

[0064] The gamma module 100 is a circuit that provides voltage values ​​corresponding to each grayscale value on the gamma curve. The gamma curve is a curve that represents the mapping relationship between grayscale and the data analog voltage driving the pixel circuit. In one embodiment, the grayscale range of the gamma curve is 0-255.

[0065] More specifically, the gamma module 100 includes multiple groups of resistor strings, each group of resistor strings corresponds to at least one gamma curve in a group of gamma curves. A group of gamma curves corresponds to a color channel, and multiple gamma curves in each group of gamma curves are preset, corresponding to different gamma values, such as Figure 3 shown.

[0066] The control circuit 100 determines the gamma value according to the gamma correction information. In a set of gamma curves, each gamma curve corresponds to different gamma correction information. In one embodiment, the gamma correction information includes DC dimming information. During the DC dimming process, the control circuit 100 determines the gamma value according to the DC dimming information to determine a gamma curve applied to the current frame display image in a set of gamma curves corresponding to the color channel, and provides a corresponding reference voltage accordingly. After the gamma module 100 obtains the reference voltage of each resistor string from the control circuit 10, it is applied to the corresponding resistor string. According to the voltage division of the reference voltage by the resistor, the voltage value corresponding to each gray scale within the gray scale range of the gamma curve corresponding to the resistor string can be provided.

[0067] Multiple gamma modules may be integrated into one or more gamma chips, or may be integrated with the data driving circuit 20 , or may be integrated with the control circuit 10 , which is not specifically limited here.

[0068] The data driving circuit 20 is a circuit connected to the driving data line 50, and is electrically connected to the gamma module 100 and the control circuit 10. It is configured to obtain display data from the control circuit 10, obtain the mapping relationship between each grayscale value and voltage in the gamma curve from the gamma module 100, and generate an analog data voltage (Vdata) according to the mapping relationship between the grayscale value in the display data and the gamma curve. Figure 3 As shown, the display data includes grayscale 1. When the analog data voltage is determined using the gamma1 curve, the voltage value corresponding to the grayscale value obtained according to the gamma1 curve is Vdata1.

[0069] The data analog voltage is transmitted to the corresponding pixel unit 80 through the data line 50, so that the light emitting element 813 in the pixel unit 80 emits light according to the analog data voltage. The magnitude of the analog data voltage determines the transient light emitting brightness of the light emitting element 813.

[0070] The data driving circuit 20 may include one or more source driver integrated circuits (SDICs). Each source driver integrated circuit SDIC may include a shift register, a latch circuit, a digital-to-analog converter, an output buffer, and the like.

[0071] The power circuit 70 is a circuit for providing stable electrical signals, and is configured to provide corresponding required power signals to the display panel 40 , the control circuit 10 , the data driving circuit 20 , and the gate driving circuit 30 .

[0072] In one case, each pixel unit 80 includes three pixel circuits 810, which are respectively configured to display red light, blue light, and green light. In another case, each pixel unit 80 includes four pixel circuits 810, which are respectively configured to display red light, blue light, green light, and white light. This is not specifically limited here.

[0073] The luminous color of each pixel unit 80 is determined by the properties of the luminous element 813. The luminous element 813 can be any luminous device, including but not limited to OLED and micro LED.

[0074] Micro LED refers to a micro light emitting body made of inorganic semiconductor layers. Micro LEDs can generally include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer. The structure of such micro LEDs can be diverse, such as vertical, horizontal, flip-chip, etc., and is not particularly limited to a specific structure.

[0075] More specifically, if Figure 2As shown, a pixel circuit 810 includes a pixel driving circuit 814 and a light emitting element 813. The pixel driving circuit 814 is electrically connected to the light emitting element 813, and the pixel driving circuit 814 is configured to drive the light emitting element 813 to emit light. The signals required by the pixel driving circuit 814 include a driving signal, a scanning signal (Scan), and an emission control signal (Emission, referred to as: EM control signal).

[0076] The scanning signal is configured to implement initialization of the pixel driving circuit and storage of analog voltage data, and the EM control signal is configured to control the driving duration of the pixel driving circuit.

[0077] The driving signal may be generated by the control circuit 10 or obtained from the outside, including but not limited to a start pulse signal, a clock signal, and an enable signal. The light-emitting control signal may be a global signal provided by the control circuit 10 or a signal generated by the gate drive circuit 30, which is not specifically limited here.

[0078] If the EM control signal is a global signal generated by the control circuit 10 , the gate driving circuit 30 obtains the EM control signal from the control circuit 10 and transmits the EM control signal to the corresponding pixel driving circuit 814 through the gate line 60 .

[0079] If both the EM control signal and the scan signal are generated by the gate driving circuit 30, the gate driving circuit 30 includes a scan signal generating circuit 301 and an EM control signal generating circuit 302. The scan signal generating circuit 301 outputs the scan signal, and the EM control signal generating circuit 302 outputs the EM control signal.

[0080] The scanning signal and the EM control signal are both shift signals. Here, the shift signal is explained by taking the scanning signal as an example. The scanning signal includes a plurality of scanning signals of different phases. The scanning signal generating circuit 301 includes a plurality of scanning signal generating sub-circuits connected in series, and each scanning signal generating sub-circuit outputs a scanning signal of a phase.

[0081] Each scanning signal generating sub-circuit is configured to obtain a clock signal from the control circuit 10, obtain a scanning signal from the output end of its previous scanning signal generating sub-circuit, or obtain a trigger signal from the control circuit 10, generate a scanning signal corresponding to the scanning signal generating sub-circuit, and transmit the scanning signal to the corresponding pixel driving circuit 814 through the corresponding gate line 60 to control the pixel driving circuit 814 to obtain display data in a timely manner.

[0082] The phase of the output signal of each scanning signal generating subcircuit lags behind the phase of the input signal. The pixel driving circuit 814 in each pixel unit 80 can be electrically connected to the scanning signal generating circuit 301 through at least one gate line 60 to obtain a scanning signal of at least one phase.

[0083] Typically, the circuit structure diagram of the pixel driving circuit 814 includes a driving transistor, a plurality of control transistors and a storage capacitor. To simplify the description, the driving transistor is referred to as a driving transistor, and the control transistor is referred to as a control transistor. The storage capacitor is configured to store an analog data voltage Vdata, and the control transistor controls the writing of the analog data voltage to the storage capacitor. The analog data voltage is configured to be applied to the control terminal of the driving tube, controls the conduction of the driving tube, and outputs the driving current from the driving tube.

[0084] The display data includes a grayscale value. The larger the grayscale value, the higher the brightness of the light-emitting element 813. The smaller the grayscale value, the lower the brightness of the light-emitting element 813. The data driving circuit is configured to convert the grayscale value into an analog data voltage output. When the driving tube is a P-type transistor, the larger the grayscale value, the smaller the analog data voltage, the larger the driving current output by the driving tube, and the higher the brightness of the light-emitting element 813. When the driving tube is an N-type transistor, the larger the grayscale value, the larger the analog data voltage, the larger the driving current output by the driving tube, and the higher the brightness of the light-emitting element 813. When the driving tube is a P-type transistor, the smaller the grayscale value, the larger the analog data voltage, the smaller the driving current output by the driving tube, and the lower the brightness of the light-emitting element 813. When the driving tube is an N-type transistor, the smaller the grayscale value, the smaller the analog data voltage, the smaller the driving current output by the driving tube, and the lower the brightness of the light-emitting element 813.

[0085] The driving mode of the pixel driving circuit includes PWM driving and / or PAM driving.

[0086] When the pixel driving circuit performs PWM driving, the transfer characteristic curve of the driving tube is as follows Figure 4A and Figure 4B This transfer characteristic curve is a transfer characteristic curve of a P-type transistor. Figure 4A The size of the transistor is larger than Figure 4B The transistor size. Figure 4A and Figure 4B , the horizontal axis is the gate voltage Vg, and the vertical axis is the source-drain current I. Only the voltage range that allows the P-type transistor to conduct is considered, that is, the range where the gate voltage is less than 0.7 V. This range is divided into a first voltage range △V1 and a second voltage range △V2.

[0087] In actual situations, due to the limitation of voltage accuracy, the gate voltage cannot take all voltages. For the driver tube, when the analog data voltage is in the first voltage range △V1, that is, when the driving current is relatively large, the analog data voltage is reduced by one unit, the increase in the output driving current is relatively small, and the accuracy of the driving current is relatively high, which will make the accuracy of the luminous brightness relatively high. When the analog data voltage is in the second voltage range △V2, due to the steep change in the transfer characteristic curve, the unit change of the gate voltage Vg corresponds to a large change in the driving current, so that when the driver tube determines the driving current based on the gate voltage determined by the display data, there is a situation where the driving current generated by adjacent gate voltages is the same, that is, different grayscale values ​​of the display data correspond to the same driving current. Therefore, the grayscale value of the display data cannot be expanded in the second range ΔV2, the mapping accuracy of the low grayscale in the display data and the driving current is poor, and the light-emitting accuracy of the light-emitting element is low.

[0088] When the pixel driving circuit performs PAM driving, the output characteristic curve of the driving tube is as follows: Figure 6 As shown, in Figure 6 In the figure, the driver tube is driven in the saturation region, that is, the curve on the right side of the saturation dividing line in the linear region. When the source voltage of the driver tube is fixed, the smaller the gate voltage Vg is, the smaller the current value of the driver tube is. When the gate voltage Vg is less than the preset threshold, the driver tube is cut off, and the driving current generated by the driver tube is approximately 0. Correspondingly, the driving current value obtained by the light-emitting element electrically connected to the driver tube is also approximately 0.

[0089] In PAM driving, the driving voltage and driving current of the light emitting element are positively correlated. In one embodiment, the light emitting element is an LED, and the voltage-brightness curve of the LED is as follows: Figure 5 As shown in FIG. 1 , the horizontal axis of the curve is the cross-over voltage of the LED. When the cross-over voltage value is less than the preset threshold value Vth, the LED does not emit light, and the threshold voltages of different LEDs are inconsistent, resulting in some LEDs emitting light and some LEDs not emitting light under the same low grayscale voltage drive. The corresponding relationship between voltage and brightness is inconsistent, resulting in poor display effect of the light-emitting element for low grayscale data.

[0090] Since the light intensity of a light-emitting element in a frame display cycle is determined by its average brightness in a frame display cycle, when calculating the average brightness, the quotient of the cumulative value of the transient brightness of the light-emitting element in its light-emitting period divided by the length of the frame display cycle is determined as the average brightness. Among them, the transient brightness of the light-emitting element is determined by the driving current of the driving tube. The larger the transient driving current, the brighter the transient brightness.

[0091] Based on the above-mentioned light-emitting principle, the average brightness of the transistor can be kept unchanged by adjusting PWM and grayscale values, shortening the light-emitting time of the driving tube, and increasing the grayscale value to increase the driving voltage of the light-emitting element. Since the driving voltage of the light-emitting element is increased to be greater than the preset threshold of each light-emitting element in the display panel, the light-emitting accuracy of the light-emitting element is improved. Since PWM is a global signal, when displaying a picture corresponding to a high grayscale, the control circuit needs to provide a larger grayscale value. When the driving data exceeds the driving data range that the controller can provide, the driving current provided by the pixel driving circuit is inaccurate, and the mapping accuracy of the high grayscale and the driving current is poor, which affects the light-emitting accuracy of the light-emitting element.

[0092] In order to solve the above problems, the present application provides a display device. The technical concept of the present application is: according to the number of divided first preset grayscale ranges, a control circuit and at least two gamma modules and a data driving circuit with the same number of gamma modules are set in the display device, and a pixel driving circuit with the same number of gamma modules is also set in each pixel unit of the display panel, each gamma module and the data driving circuit are electrically connected one by one, each data driving circuit is electrically connected to a corresponding pixel driving circuit in each pixel unit, and is used to transmit and process the original grayscale value in the same first preset grayscale range in the original display data obtained by the control circuit, and each pixel driving circuit can expand the analog data voltage corresponding to the original grayscale value obtained within its corresponding first preset grayscale range, because multiple pixel driving circuits corresponding to different first preset grayscale ranges in the pixel unit drive the same light-emitting element to emit light, and the control of each grayscale range does not affect each other, thereby ensuring the light-emitting accuracy of the light-emitting element.

[0093] The circuit structure of the display device provided in the present application is explained below.

[0094] Figure 7 FIG. 1 is a circuit structure diagram of a display device provided according to an exemplary embodiment of the present application, such as Figure 7 As shown, the display device includes a control circuit 10 , a gamma module 100 , a data driving circuit 20 , a gate driving circuit 30 and a display panel 40 .

[0095] The control circuit 10 is electrically connected to the gamma module 100 and the data driving circuit 10 .

[0096] The number of gamma modules 100 and data driving circuits 10 is the same, which is at least two.

[0097] The control circuit 10 is configured to obtain original display data, generate at least one first display data according to the original display data and at least two first preset grayscale ranges, transmit each first display data to a corresponding data driving circuit 10, and transmit a reference voltage of a gamma curve corresponding to the first display data to a corresponding gamma module 100. The first preset grayscale ranges corresponding to each data driving circuit 10 are different.

[0098] Each gamma module 100 corresponds to a different gamma curve, each gamma curve corresponds to each first preset grayscale range one by one, and the gamma module 100 is configured to output a voltage value corresponding to the corresponding gamma curve at multiple preset grayscales according to a reference voltage.

[0099] Each gamma module 100 is electrically connected to each data driving circuit 20 in a one-to-one correspondence, and each data driving circuit 20 is configured to output an analog data voltage according to the first display data and voltage values ​​corresponding to a plurality of preset grayscales provided by the gamma module.

[0100] More specifically, the gamma module 100 is provided with a plurality of binding point voltage output terminals, and the data driving circuit 20 is provided with a plurality of binding point voltage input terminals. The plurality of binding point voltage output terminals of the gamma module 100 and the plurality of binding point voltage input terminals of the data driving circuit 20 are electrically connected correspondingly.

[0101] The gamma module 100 outputs voltage values ​​corresponding to multiple preset grayscales through multiple binding point voltage output terminals. The preset grayscale corresponding to each binding point voltage input terminal is set in the data driving circuit 20. When the data driving circuit 20 obtains the voltage value transmitted by the gamma module 100 at the binding point voltage input terminal and obtains the first display data transmitted by the control circuit 10, it obtains the grayscale value from the first display data and generates an analog data voltage based on the grayscale value and the voltage value obtained at each binding point voltage input terminal.

[0102] Among them, when the grayscale value in the first display data is a preset grayscale corresponding to a binding point voltage input terminal, the voltage value obtained by the binding point voltage input terminal is determined as the analog data voltage; when the grayscale value in the first display data is between the preset grayscales corresponding to two binding point voltage input terminals, interpolation calculation is performed between the voltage values ​​obtained by the two binding point voltage input terminals to determine the analog data voltage.

[0103] The display panel 40 includes a pixel unit 810, and there is at least one pixel unit 810. The pixel unit 810 includes at least two pixel driving circuits and a light emitting element 813. The at least two pixel driving circuits include: a first pixel driving circuit 811, ..., and an Mth pixel driving circuit 812.

[0104] The number of pixel driving circuits in each pixel unit 810 is the same as the number of data driving circuits 20 , and the first preset grayscale ranges corresponding to the pixel driving circuits in the pixel unit 810 are different.

[0105] Each data driving circuit 20 is electrically connected to a corresponding pixel driving circuit in each pixel unit 810 , and the first preset grayscale ranges corresponding to the electrically connected data driving circuit 20 and the pixel driving circuit are the same.

[0106] For example: the display device includes two data driving circuits: a first data driving circuit and a second data driving circuit, and each pixel unit 810 includes two pixel driving circuits: a first pixel driving circuit and a second pixel driving circuit. The first data driving circuit is electrically connected to the first pixel driving circuit in each pixel unit 810, and the second data driving circuit is electrically connected to the second pixel driving circuit in each pixel unit 810, wherein the first data driving circuit and the first pixel driving circuit have the same first preset grayscale range, and the second data driving circuit and the second pixel driving circuit have the same first preset grayscale range.

[0107] In the pixel unit 810, each pixel driving circuit is electrically connected to the light emitting element 813, and the pixel driving circuit is configured to generate a driving signal according to the analog data voltage to drive the light emitting element 813 to emit light. In one frame display cycle, only one pixel driving circuit in each pixel unit 810 obtains the analog data voltage, generates a driving signal, and drives the light emitting element 813 to emit light, and the light emitting brightness of the light emitting element is positively correlated with the analog data voltage. The greater the analog data voltage, the greater the brightness generated by the light emitting element.

[0108] In the above technical solution, when the control circuit obtains the original display data, it can generate corresponding multiple first display data according to multiple first preset grayscale ranges based on the original grayscale value in the original display data, and determine the corresponding gamma curve, and transmit the reference voltage of the above gamma curve to the corresponding gamma module, so that the gamma module provides voltage values ​​corresponding to multiple preset grayscales in the gamma curve. After obtaining the first display data, the data driving circuit uses the multiple voltage values ​​provided by the gamma module to provide the analog data voltage corresponding to the grayscale value to the corresponding pixel driving circuit to drive the light-emitting element to emit light. The control circuit uses gamma curves with different control precisions for display data in different grayscale ranges to drive the corresponding pixel driving circuit to drive the light-emitting element to emit light, thereby improving the mapping accuracy of each grayscale in the display data and the driving current generated by the pixel driving circuit, thereby improving the light-emitting accuracy of the light-emitting element.

[0109] The data processing process of the control circuit 10 is explained in detail below.

[0110] The control circuit 10 stores a plurality of gamma curves, each having a different voltage adjustment range, and the plurality of gamma curves includes a basic gamma curve.

[0111] Each set of gamma curves includes multiple groups of gamma curves, each group of gamma curves corresponds to each color channel one by one. In one embodiment, the number of color channels is 3, including RGB; in another embodiment, the number of color channels is 4, including RGBW.

[0112] Each group of gamma curves includes multiple gamma curves, and the gamma value of each gamma curve is different, that is, the same grayscale value corresponds to different voltage values ​​in different gamma curves. The gamma value is determined by the control circuit 10 according to the target gamma correction information. In one embodiment, the target gamma correction information is set by the user, and in another embodiment, the target gamma correction information is automatically adjusted by the display device according to information such as ambient light and display data.

[0113] In one embodiment, the gamma correction information includes DC dimming information. When performing DC dimming, the control circuit 10 may determine a gamma curve from each group of gamma curves according to the dimming information corresponding to each color channel.

[0114] In one embodiment, when the target correction information is a preset gamma correction information, the control circuit 10 determines a gamma curve corresponding to the preset gamma correction information from a group of gamma curves corresponding to each color channel.

[0115] In another embodiment, when the display device supports stepless dimming, the target gamma correction information may be preset gamma correction information or an intermediate value of two preset gamma correction information. When the target gamma correction information is between two preset gamma correction information, for each color channel, two gamma curves corresponding to the two preset gamma correction information are determined from a group of gamma curves corresponding to the color channel, and a gamma curve corresponding to the dimming information is determined by performing interpolation calculation between the two gamma curves.

[0116] The control circuit 10 is configured to: obtain a frame of original display data, the original display data corresponds to a basic gamma curve, wherein the total grayscale range of the basic gamma curve includes a plurality of first preset grayscale ranges that do not overlap each other, and the resolution of the original display data is the same as the resolution of the display panel.

[0117] The control circuit 10 divides the original grayscale values ​​in the original display data by using a plurality of first preset grayscale ranges to obtain at least one group of original grayscale sets, and generates corresponding first display data by using each group of original grayscale sets.

[0118] Among them, each group of original grayscale sets includes at least one original grayscale value, which is located within the corresponding first preset grayscale range. The brightness generated by the pixel driving circuit driving the light-emitting element controlled by the original grayscale value in the original grayscale set is the same as the brightness generated by the pixel driving circuit driving the light-emitting element controlled by the first grayscale value corresponding to the original grayscale value in the first display data.

[0119] More specifically, when the control circuit 10 uses multiple first preset grayscale ranges to divide the original grayscale values ​​in the original display data, it compares each original grayscale value with multiple first preset grayscale ranges. If the original grayscale value is within the first preset grayscale range, it is determined that the original grayscale value is within the original grayscale set corresponding to the first preset grayscale range.

[0120] In one embodiment, the first preset grayscale range is determined according to a preset analog data voltage set by a user and a basic gamma curve corresponding to the original display data.

[0121] More specifically, the control circuit 10 obtains a basic gamma curve and a plurality of preset analog data voltage ranges corresponding to the original display data, each preset analog data voltage range including a maximum value and a minimum value. The maximum value and the minimum value of each preset analog data voltage range are processed using the basic gamma curve to obtain the maximum value and the minimum value of the corresponding first preset grayscale range, and each first preset grayscale range is determined according to the maximum value and the minimum value of each first preset grayscale range.

[0122] Since the original display data includes original display sub-data of multiple color channels, and each color channel corresponds to a group of basic gamma curves, the control circuit 10 determines a basic gamma curve from a group of basic gamma curves corresponding to each color channel according to the target gamma correction information when splitting the original display sub-data of each color channel, and processes each preset analog data voltage range using the corresponding root basic gamma curve for each color channel to determine the maximum value and the minimum value of the corresponding first preset grayscale range.

[0123] The following is a detailed explanation of the process in which the control circuit 10 generates the first display data corresponding to each first preset grayscale range by using the original grayscale value matching each first preset grayscale range.

[0124] The division of the original display data includes four scenarios: voltage mapping scenario, grayscale mapping scenario, voltage-grayscale mapping scenario, and grayscale-voltage mapping scenario.

[0125] In the voltage mapping scenario, a plurality of pixel driving circuits are provided in the pixel circuit 810 , and the plurality of pixel driving circuits include a first pixel driving circuit and a second pixel driving circuit, and both the first pixel driving circuit and the second pixel driving circuit are electrically connected to the light emitting element 813 .

[0126] The first pixel driving circuit is configured to obtain an analog data voltage corresponding to a higher gray scale and generate a driving current using a driving tube therein.

[0127] The second pixel driving circuit is configured to obtain an analog data voltage corresponding to a lower gray scale and generate a driving current using a driving tube therein.

[0128] As the size of the driver tube increases, the analog data voltage that can be obtained is higher, and the corresponding driving current provided is larger. Correspondingly, in the grayscale non-expandable area, the transfer characteristic curve of the driver tube is steeper, and low grayscale data cannot be expanded.

[0129] Therefore, driving tubes of different sizes are arranged in each pixel driving circuit. The larger the lower limit value or upper limit value of the gray scale range corresponding to each pixel driving circuit is, the larger the size of the driving tube is.

[0130] Since the size of the driving tube changes, when the light-emitting duration of the light-emitting element remains unchanged, the analog data voltage needs to be increased to keep the light-emitting brightness of the light-emitting element unchanged. Therefore, it is necessary to map the voltage range corresponding to the first preset grayscale range in the basic gamma curve to a larger voltage range in other gamma curves. This voltage is the analog data voltage.

[0131] Fig. 8A and Figure 8B Schematic diagram of the voltage mapping process.

[0132] As shown in the figure, the curve on the left is a basic gamma curve. According to multiple first preset grayscale ranges, the voltage range of the basic gamma curve is divided to obtain multiple regions.

[0133] In one embodiment, a voltage mapping gamma curve mapped with each first preset grayscale range in the basic gamma curve and an applied voltage range in the curve are determined by using a preset voltage mapping table, wherein the applied voltage range of the voltage mapping gamma curve is also the first preset voltage range.

[0134] For example: Fig. 8AIn order to perform voltage mapping on the voltage data whose basic gamma curve is between the analog data voltage Vtha1 and Vtha2, when mapping it to the voltage range of Vthc1 to Vthc2 in the first voltage mapping gamma curve on the right, according to the analog data voltage Vtha1 and the basic gamma curve, the grayscale value corresponding to the voltage value is determined to be grayscale a2, and according to the analog data voltage Vtha2 and the basic gamma curve, the grayscale value corresponding to the voltage value is determined to be grayscale a1, then the first preset grayscale range is grayscale a2 to grayscale a1, and the gamma curve of its voltage mapping is determined according to the first preset grayscale range: Fig. 8A The gamma curve shown on the right side, in the right gamma curve, the application voltage range is still grayscale a2 ~ grayscale a1, so that when the control circuit obtains display data within grayscale a2 ~ grayscale a1, it can use the grayscale a2 ~ grayscale a1 part of the gamma curve on the right side to provide a mapping relationship between grayscale and analog data voltage.

[0135] Another example: Figure 8B In order to perform voltage mapping on the voltage data between the analog data voltage 0 and Vtham of the basic gamma curve, it is mapped to the voltage range of 0 to Vthdm in the second voltage mapping gamma curve on the right, and the grayscale value corresponding to the voltage value is determined to be grayscale am according to the analog data voltage Vtham and the basic gamma curve. The first preset grayscale range is 0 to grayscale am, so that when the control circuit obtains display data within the range of 0 to grayscale am, it can use the 0 to grayscale am part of the gamma curve on the right to provide a mapping relationship between grayscale and analog data voltage.

[0136] Among them, the gamma value has been determined before voltage mapping. Fig. 8A and Figure 8B In the curves shown, voltage mapping is performed on the curve corresponding to gamma1.

[0137] In the above two groups of gamma curves, the luminous brightness of the light-emitting element driven by the corresponding driving tube controlled by the first analog data voltage corresponding to each grayscale value in the basic gamma curve is the same as the luminous brightness of the light-emitting element driven by the corresponding driving tube controlled by the second analog data voltage corresponding to the grayscale value in the voltage mapping gamma curve, wherein when the basic gamma curve and the voltage mapping gamma curve are different, the sizes of the driving tubes controlled by the two groups of gamma curves are also different. For example: the luminous brightness of the light-emitting element driven by the corresponding driving tube controlled by Vtha1 corresponding to the grayscale value a1 in the basic gamma curve is the same as the luminous brightness of the light-emitting element driven by the corresponding driving tube controlled by Vthc1 corresponding to the grayscale value a1 in the voltage mapping gamma curve.

[0138] In the voltage mapping process, the voltage difference between two threshold voltages in the basic gamma curve is smaller than the voltage difference between two threshold voltages in the first voltage mapping gamma curve, that is, ΔVA2<ΔVC2.

[0139] Based on the above voltage mapping principle, the number of voltage mapping gamma curves after voltage mapping can be determined according to the number of the first preset grayscale ranges, which is the same as the number of driving tubes in the pixel circuit, and each driving tube drives the light-emitting element using the data in its corresponding first preset grayscale range. Therefore, it is necessary to generate multiple first display data according to each first preset grayscale range from the original display data, and transmit each first display data to the corresponding driving tube, and use the voltage mapping gamma curve corresponding to the first preset grayscale range to drive the light-emitting element to emit light.

[0140] The following is an explanation of the process of generating the first display data using the original display data during the voltage mapping process. The first preset grayscale range includes a plurality of voltage mapping grayscale ranges.

[0141] The control circuit generates at least one group of original grayscale sets according to the original display data and multiple voltage mapping grayscale ranges, and generates corresponding first display data using the original grayscale values ​​in each original grayscale set. Each first display data includes the original grayscale value or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale value in the first display data is in the original grayscale set corresponding to the first display data.

[0142] Wherein, each first display data corresponds to a different group of voltage mapping gamma curves, and the voltage span value corresponding to the original grayscale value in the first display data in the corresponding voltage mapping gamma curve is greater than the voltage span value corresponding to the basic gamma curve. The following takes the example of splitting the original display data into two voltage mapping grayscale ranges to generate two first display data to explain the generation process of the first display data.

[0143] like Fig. 9As shown, the original display data 110 is a grayscale matrix of 5 rows and 5 columns, the value range of the matrix data is 0-255, the high and low grayscale division threshold is determined to be 100, then the two first preset grayscale ranges are: 0-100 and 101-255, each data in the grayscale matrix is ​​compared with the above two preset grayscale ranges to obtain two sets of data, and the two first display data generated in this way are shown as grayscale matrix 111 and grayscale matrix 112. In grayscale matrix 111, data greater than 100 is replaced with black insertion data, and other grayscale data remains unchanged; grayscale matrix 112 replaces data less than 101 with black insertion data, and other grayscale data remains unchanged. The position of the replaced data is shown in the shaded area. Among them, the voltage mapping gamma curves corresponding to the first display data 111 and the second display data 112 are different.

[0144] Correspondingly, the pixel circuit includes a high grayscale pixel driving circuit and a low grayscale pixel driving circuit. The high grayscale pixel driving circuit obtains data of a corresponding position in the grayscale matrix 112 or its gamma-mapped matrix. When the data is normal grayscale data, a corresponding driving current is generated according to the grayscale data to drive the light-emitting element to emit light; when the data is black-inserted data, no driving current is generated and the light-emitting element does not emit light.

[0145] The process of the low grayscale pixel driving circuit using the grayscale matrix 111 to drive the light-emitting element to emit light is the same as that of the high grayscale pixel driving circuit, which will not be repeated here.

[0146] Since the positions of the black insertion data in the two grayscale matrices are complementary, that is, when the grayscale matrix 111 contains normal grayscale data, the data at this position in the grayscale matrix 112 is preset black screen data, and vice versa. Therefore, in one pixel circuit, only one pixel driving circuit generates a driving signal for one frame of display data.

[0147] In the above technical solution, in each pixel circuit, multiple pixel driving circuits are provided to drive the same light-emitting element to emit light, and the grayscale range of the original display data corresponding to each pixel driving circuit is different. For different grayscale ranges, the size of the driving tube in each pixel driving circuit is adjusted, and the voltage mapping gamma curve corresponding to each grayscale range is used to adjust the analog data voltage corresponding to each grayscale value, so that each driving tube can be normally developed within its corresponding grayscale range, and the control of each grayscale range does not affect each other, thereby ensuring the light-emitting accuracy of the light-emitting element.

[0148] In the grayscale mapping scenario, Fig. 10A and Fig. 10B Schematic diagram of the grayscale mapping process.

[0149] As shown in the figure, the curve on the left is a basic gamma curve. According to multiple first preset grayscale ranges, the grayscale range of the basic gamma curve is divided to obtain multiple areas.

[0150] In one embodiment, a preset grayscale mapping table is used to determine a grayscale mapping gamma curve after mapping each first preset grayscale range in the basic gamma curve and an applied voltage range in the curve. The applied voltage range of the grayscale mapping gamma curve is greater than the first preset voltage range, and the voltage range corresponding to the applied voltage range in the grayscale mapping gamma curve is the same as the voltage range corresponding to the first preset voltage range in the basic gamma curve. The same voltage controls the corresponding driving tube to drive the light-emitting element to have the same luminous brightness.

[0151] For example: Fig. 10A In order to perform grayscale mapping on the grayscale data whose basic gamma curve is below the grayscale value Gath1, when mapping it to the first grayscale mapping gamma curve on the right, the grayscale value corresponding to the voltage value V1 in the first grayscale mapping gamma curve is determined according to the voltage value V1 corresponding to the grayscale value mapped to the grayscale value Gath1 in the basic mapping gamma curve. In one embodiment, the grayscale value is 255, then the voltage range of 0 to grayscale value Gath1 in the basic gamma curve is mapped, and the applied voltage range in the first grayscale mapping gamma curve is 0 to grayscale 255.

[0152] Another example: Fig. 10B To perform grayscale mapping on the basic gamma curve within the grayscale value Gath1 to grayscale value Gath2 range, according to the preset grayscale mapping table, the grayscale mapping gamma curve corresponding to the first preset grayscale range of grayscale value Gath1 to grayscale value Gath2 is determined as Fig. 10B The second grayscale mapping gamma curve shown on the right determines that the voltage range corresponding to the grayscale range is voltage V1~V3 according to the grayscale values ​​at the two end points of the grayscale range and the basic gamma curve, and determines that its corresponding grayscale value is grayscale Gathn according to voltage V1 and the second grayscale mapping gamma curve, and determines that its corresponding grayscale value is grayscale 255 according to voltage V2 and the second grayscale mapping gamma curve. Then, when the grayscale value Gath1~grayscale value Gath2 part of the basic gamma curve is grayscale mapped to the second grayscale mapping gamma curve through grayscale mapping, the applied voltage range is grayscale Gathn~255.

[0153] Similar to voltage mapping, the gamma value has been determined before grayscale mapping. The following uses the gamma1 curve as an example to explain grayscale mapping.

[0154] Based on the above voltage mapping principle, the number of grayscale mapping gamma curves after voltage mapping can be determined according to the number of the first preset grayscale ranges, which is the same as the number of driving tubes in the pixel circuit, and each driving tube drives the light-emitting element using the data in its corresponding first preset grayscale range. Therefore, it is necessary to generate multiple first display data according to each first preset grayscale range from the original display data, and transmit each first display data to the corresponding driving tube, and drive the light-emitting element to emit light using the voltage mapping gamma curve corresponding to the first preset grayscale range. Among them, the size of each driving tube is the same.

[0155] Since each gamma curve and the resistor string in the gamma module are in a corresponding relationship, and the number of binding points set for each resistor string is fixed, for example, 9. The grayscale range is expanded, resulting in that when the first display data is mapped to the second display data while keeping the luminous brightness and the voltage variation range unchanged, since the grayscale span value of the second display data is greater than the grayscale span value of the first display data, the number of binding points within the grayscale span range of the second display data in the grayscale mapping gamma curve is greater than the number of binding points within the grayscale span range of the first display data in the basic gamma curve, and the increase in the number of binding points improves the accuracy of the second display data and the grayscale adjustment accuracy.

[0156] The process of generating the first display data by using the original display data in the voltage process is explained below. The first preset grayscale range includes a plurality of grayscale mapping grayscale ranges.

[0157] The control circuit uses multiple grayscale mapping grayscale ranges to divide the original grayscale values ​​in the original display data to obtain at least one group of original grayscale sets, and uses the original grayscale values ​​in each group of original grayscale sets to generate at least one second display data, each second display data includes the original grayscale value or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale value in the second display data is in the original grayscale set corresponding to the second display data.

[0158] Each second display data is mapped to the first display data using a grayscale mapping table, wherein the grayscale mapping table includes a mapping relationship between a plurality of preset original grayscale values ​​in a basic gamma curve and a plurality of preset first grayscale values ​​in a corresponding grayscale mapping gamma curve.

[0159] When the second display data are mapped to the first display data using the grayscale mapping table, if the original grayscale value in the second display data is a preset original grayscale value, a preset first grayscale value corresponding to the preset original grayscale value is determined from the grayscale mapping table; if the original grayscale value in the second display data is between two preset original grayscale values, two preset first grayscale values ​​corresponding to the two preset original grayscale values ​​are determined from the grayscale mapping table, and the first grayscale value corresponding to the original grayscale value is determined through interpolation calculation. The first display data is then constructed using the first grayscale value.

[0160] After the display data are mapped, each second display data corresponds to the same set of basic gamma curves, and each first display data corresponds to different sets of grayscale mapping gamma curves.

[0161] The grayscale span value of the original grayscale value in the second display data is less than the grayscale span value of the first grayscale value corresponding to the original grayscale value in the first display data. The voltage value determined by the original grayscale value in the second display data in the basic gamma curve is the same as the voltage value determined by the first grayscale value corresponding to the original grayscale value in the first display data in the corresponding grayscale mapping gamma curve.

[0162] The following takes the example of splitting the original display data into two grayscale mapping grayscale ranges to generate two first display data to explain the generation process of the first display data.

[0163] like Fig.11 As shown, the original display data 110 is a grayscale matrix of 5 rows and 5 columns, the value range of the matrix data is 0-255, the high and low grayscale division threshold is determined to be 100, then the two first preset grayscale ranges are: 0-100 and 101-255, each data in the grayscale matrix is ​​compared with the above two preset grayscale ranges to obtain two sets of data, and the two second display data generated in this way are shown in grayscale matrix 113 and grayscale matrix 114. In grayscale matrix 113, data greater than 100 is replaced with black insertion data, and other grayscale data remains unchanged; grayscale matrix 114 replaces data less than 101 with black insertion data, and other grayscale data remains unchanged. The position of the replaced data is shown in the shaded area. Among them, the second display data 113 and the second display data 114 both correspond to the basic gamma curve.

[0164] When the first preset grayscale range 0 to 100 is grayscale mapped, the second display data 113 is adjusted to the first display data 114 using the grayscale mapping table. The voltage value corresponding to each grayscale value in the second display data 113 in the basic gamma curve is the same as the voltage value corresponding to the grayscale value in the first display data 114 in the grayscale mapping gamma curve after voltage mapping.

[0165] For example, the voltage value corresponding to the first row and first column data 11 in the second display data 113 in the basic gamma curve is the same as the voltage value corresponding to the first row and first column data 33 in the first display data 115 in the grayscale mapping gamma curve.

[0166] When displaying data within the first preset grayscale range of 0 to 100, the corresponding light-emitting element is driven to emit light using the voltage-mapped data and the grayscale mapping gamma curve.

[0167] For the first preset grayscale range 101-255, the second display data 114 can be directly determined as the first display data, and the corresponding light-emitting element can be driven to emit light using the basic gamma curve.

[0168] Since the positions of the black insertion data in the two grayscale matrices are complementary, that is, when the grayscale matrix 115 contains normal grayscale data, the data at the position of the grayscale matrix 114 is black insertion data, and vice versa. Therefore, in one pixel circuit, for one frame of display data, only one pixel driving circuit generates a driving signal.

[0169] In the voltage-grayscale mapping scenario, the control circuit 10 can perform voltage mapping and grayscale mapping simultaneously.

[0170] Fig.12 Schematic diagram of the voltage mapping and grayscale mapping process.

[0171] As shown in the figure, when mapping curve 1, voltage mapping may be performed first.

[0172] In one embodiment, according to the high and low grayscales, a threshold voltage Vtha1 may be selected, and the gamma1 curve may be split into two parts according to the threshold voltage Vtha1, wherein the gamma curve greater than the threshold voltage Vtha1 is a curve corresponding to the high grayscale, and the gamma curve less than or equal to the threshold voltage Vtha1 is a curve corresponding to the low grayscale. The grayscale value corresponding to the threshold voltage Vtha1 is Gfth2.

[0173] In some scenarios, the analog data voltage VdataA corresponding to the high grayscale curve can be expanded in grayscale in the corresponding pixel driving circuit to drive the light-emitting element to emit light accurately. The control circuit 10 can still keep the data within the grayscale range unchanged and still use the curve in the high grayscale area of ​​curve 1 to provide the analog data voltage.

[0174] Therefore, the control circuit 10 only performs voltage mapping on the low grayscale curve. The control circuit 10 obtains the size of the driving tube in the pixel driving circuit driven by the low grayscale data, determines the brightness corresponding to Vtha1 in curve 1, and determines the gamma curve as shown in the gamma1 in the shaded area of ​​curve 2. Among them, the voltage threshold for dividing the high and low grayscale curves is different in Vtha1 in curve 1 and Vthf1 in curve 2.

[0175] In this area, grayscale mapping is performed again.

[0176] In some scenes, the grayscale value is divided into three parts for mapping, and the threshold grayscale value Gfth1 and the threshold grayscale value Gfth2 can be selected. The data corresponding to the gamma1 curve in the shaded area ② of curve 2 is less than the threshold grayscale value Gfth1, and it is mapped to the data corresponding to the gamma1 curve in the shaded area ② of curve 3, wherein the voltage value Vthf2 corresponding to the threshold grayscale value Gfth1 in curve 2 is the same as the voltage value Vthf2 corresponding to the grayscale value 255 in curve 3. That is, the voltage variation range is kept unchanged and the corresponding grayscale range is expanded.

[0177] The gamma1 curve in the shaded area ③ in Curve 2 is mapped to Curve 4, wherein the voltage value Vthf2 corresponding to the threshold grayscale value Gfth1 in Curve 2 is the same as the voltage value Vthf2 corresponding to the grayscale value Glth1 in Curve 4, and the voltage value Vthf1 corresponding to the threshold grayscale value Gfth2 in Curve 2 is the same as the voltage value Vthf1 corresponding to the grayscale value 255 in Curve 4.

[0178] Since gamma1 is not included in the shaded area ④ in curve ②, grayscale mapping is not required.

[0179] The following is an explanation of the process of generating the first display data using the original display data during the voltage-grayscale mapping process. The first preset grayscale range includes a plurality of voltage mapping grayscale ranges and a plurality of grayscale mapping grayscale ranges.

[0180] The control circuit generates at least one third display data according to the original display data and multiple voltage mapping grayscale ranges, each third display data includes the original grayscale value or black insertion data corresponding to each pixel unit, and the original grayscale value in the third display data is within the voltage mapping grayscale range corresponding to the third display data.

[0181] Multiple fourth display data are generated according to each third display data and multiple grayscale mapping grayscale ranges, each fourth display data includes an original grayscale value or black insertion data corresponding to each pixel unit, and the original grayscale value in the fourth display data is within the grayscale mapping grayscale range corresponding to the fourth display data.

[0182] Each fourth display data is mapped to the first display data using a grayscale mapping table, wherein each third display data corresponds to a different group of voltage mapping gamma curves, and the voltage span value corresponding to the original grayscale value in the third display data in the corresponding voltage mapping gamma curve is greater than the voltage span value corresponding to the basic gamma curve.

[0183] Each first display data corresponds to a different group of voltage-grayscale mapping gamma curves, and a grayscale span value of an original grayscale value in the fourth display data is smaller than a grayscale span value of a first grayscale value corresponding to the original grayscale value in the first display data.

[0184] The voltage value determined by the original grayscale value in the fourth display data in the voltage mapping gamma curve is the same as the voltage value determined by the first grayscale value corresponding to the original grayscale value in the first display data in the voltage-grayscale mapping gamma curve.

[0185] The following takes the example of splitting the original display data by two voltage-mapped grayscale ranges and two grayscale-mapped grayscale ranges to generate three first display data to explain the generation process of the first display data.

[0186] like Fig.13 As shown, the original display data 110 is a grayscale matrix with 5 rows and 5 columns, and the value range of the matrix data is 0 to 255. When the original display data 110 is voltage mapped, the grayscale value 100 is used as the first high and low grayscale division threshold to generate two third display data 116 and 117, wherein the splitting process is the same as Fig. 9 The process of splitting the original display data 110 into two first display data 111 and 112 is the same and will not be repeated here.

[0187] The third display data 117 may be determined as first display data, and the corresponding driving tube may be controlled to drive the light-emitting element to emit light in combination with the basic gamma curve.

[0188] Grayscale mapping is performed on the third display data 116 , and a grayscale value of 50 is used as the second high and low grayscale division threshold to generate two fourth display data 118 and 119 . The grayscale value in the fourth display data is not adjusted.

[0189] Then, according to the voltage-grayscale mapping gamma curve corresponding to each fourth display data, the grayscale value in the fourth display data is adjusted accordingly to generate two first display data 120 and 121, and the corresponding driving tube is controlled to drive the light-emitting element to emit light in combination with the corresponding voltage-grayscale mapping gamma curve.

[0190] In the grayscale-voltage mapping scenario, the control circuit 10 can perform voltage mapping and grayscale mapping simultaneously.

[0191] Fig.14 Schematic diagram of the grayscale mapping and voltage mapping process.

[0192] As shown in the figure, when mapping is performed for curve 1, grayscale mapping may be performed first.

[0193] In one embodiment, according to the high and low grayscales, the threshold grayscale Gath2 can be selected, and the gamma1 curve is split into two parts according to the threshold grayscale Gath2, the gamma curve greater than the threshold grayscale Gath2 is the curve corresponding to the high grayscale, and the gamma curve less than or equal to the threshold grayscale Gath2 is the curve corresponding to the low grayscale. The voltage value corresponding to the threshold grayscale Gath2 is Vtha1.

[0194] In some scenarios, the control circuit 10 may still keep the high data in the shadow range ① unchanged, and still use the curve in the high grayscale area of ​​the curve 1 to provide the analog data voltage.

[0195] Therefore, the control circuit 10 only performs grayscale mapping on the low grayscale curve. The control circuit 10 obtains the size of the driving tube in the pixel driving circuit driven by the low grayscale data, determines the brightness corresponding to Vtha1 in curve 1, and the determined gamma curve is shown as gamma1 in the shaded area of ​​curve 2 in the figure. Among them, the voltage threshold for dividing the high and low grayscale curves is the same in Vtha1 in curve 1 and Vtha1 in curve 2, and the grayscale values ​​corresponding to the voltage threshold are different.

[0196] In this area, gray voltage mapping is performed again.

[0197] In some scenarios, the grayscale value is divided into two parts for mapping, and the threshold voltage value Vthf2 can be selected. The voltage value corresponding to the gamma1 curve in the shaded area ② of Curve 2 is less than the threshold voltage value Vthf2, and it is mapped to the data corresponding to the gamma1 curve in the shaded area ② of Curve 3, wherein the threshold grayscale value Gfth1 corresponding to the threshold voltage value Vthf2 in Curve 2 is the same as the threshold grayscale value in Curve 3, and the voltage value Vtha2 corresponding to the threshold grayscale value Gfth1 in Curve 3 is different from the threshold voltage value Vthf2 in Curve 2. That is, the grayscale variation range is kept unchanged, and the corresponding voltage range is expanded.

[0198] The gamma1 curve in the shaded area ③ in Curve 2 is mapped to Curve 4, wherein the threshold grayscale value Gfth1 corresponding to the threshold voltage value Vthf2 in Curve 2 is the same as the threshold grayscale value Gfth1 in Curve 4, and the grayscale value Gfth2 corresponding to the voltage value Vtha1 in Curve 2 is the same as the grayscale value Gfth2 in Curve 4.

[0199] The following is an explanation of the process of generating the first display data using the original display data during the grayscale-voltage mapping process. The first preset grayscale range includes a plurality of voltage mapping grayscale ranges and a plurality of grayscale mapping grayscale ranges.

[0200] The control circuit generates at least one fifth display data according to the original display data and multiple grayscale mapping grayscale ranges, each fifth display data includes the original grayscale value or black insertion data corresponding to each pixel unit, and the original grayscale value in the fifth display data is within the voltage mapping grayscale range corresponding to the fifth display data.

[0201] The fifth display data are mapped to the sixth display data using the grayscale mapping table; the grayscale span value of the original grayscale value in the fifth display data is smaller than the grayscale span value of the first grayscale value corresponding to the original grayscale value in the sixth display data.

[0202] According to the sixth display data and multiple voltage mapping grayscale ranges, multiple first display data are generated, each first display data includes a first grayscale value or black insertion data corresponding to each pixel unit, and the first grayscale value in the first display data is within the voltage mapping grayscale range corresponding to the first display data.

[0203] Among them, each fifth display data corresponds to the same group of basic gamma curves, and each sixth display data corresponds to different groups of grayscale mapping gamma curves. The voltage value determined by the original grayscale value in the fifth display data in the basic gamma curve is the same as the voltage value determined by the first grayscale value corresponding to the original grayscale value in the sixth display data in the corresponding grayscale mapping gamma curve.

[0204] Each first display data corresponds to a different group of voltage-grayscale mapping gamma curves, and a voltage span value corresponding to a first grayscale value in the first display data in the corresponding grayscale-voltage mapping gamma curve is greater than a voltage span value in the corresponding grayscale mapping gamma curve.

[0205] The following takes the example of splitting the original display data by two voltage-mapped grayscale ranges and two grayscale-mapped grayscale ranges to generate three first display data to explain the generation process of the first display data.

[0206] like Fig.15 As shown, the original display data 110 is a grayscale matrix of 5 rows and 5 columns, and the value range of the matrix data is 0 to 255. When grayscale mapping is performed on the original display data 110, the grayscale value 100 is used as the first high and low grayscale division threshold to generate two fifth display data 122 and 123, and the fifth display data 123 is grayscale mapped to generate the sixth display data 124, wherein the splitting process is the same as Fig.11The process of splitting the original display data 110 into two second display data 113 and 114 and generating the first display data 115 when grayscale mapping is performed on the second display data 114 is the same and will not be repeated here.

[0207] The fifth display data 123 may be determined as first display data, and the corresponding driving tube may be controlled to drive the light-emitting element to emit light in combination with the basic gamma curve.

[0208] The sixth display data 124 is voltage mapped, and the grayscale value 120 is used as the second high and low grayscale division threshold to generate two first display data 125 and 126. The grayscale value in the first display data is not adjusted relative to the sixth display data 124, and only black insertion is performed on necessary positions.

[0209] The first display data 125 and 126 correspond to different grayscale-voltage mapping gamma curves. The first display data 125 and 126 control the corresponding driving tubes to drive the light-emitting elements to emit light in combination with the corresponding grayscale-voltage mapping gamma curves.

[0210] Each pixel driving circuit in the pixel circuit 810 is explained below.

[0211] Taking the pixel circuit 810 including four pixel driving circuits as an example, the four pixel driving circuits can be arranged in a row, in a column, or in a 2×2 array. The four pixel driving circuits are respectively a first pixel driving circuit 811, a second pixel driving circuit 812, a third pixel driving circuit, and a fourth pixel driving circuit.

[0212] In one embodiment, the light emitting element includes at least one LED, and each pixel driving circuit is electrically connected to at least one LED in the light emitting element.

[0213] For example, the light-emitting element includes an LED, and the four pixel driving circuits are electrically connected to the LED. During the display of each frame of the display image, the LED obtains a driving signal generated by one of the pixel driving circuits to emit light.

[0214] For example, the light-emitting element includes two LEDs, each LED is electrically connected to at least one pixel driving circuit, and the pixel driving circuits connected to each LED can be repeated. During the display process of each frame of the display image, a pixel driving circuit generates a driving signal to drive at least one LED connected thereto to emit light.

[0215] The gate driving circuit 30 can transmit the EM control signal to each of the four pixel driving circuits through the gate line. When the PWM signal driving is consistent, the EM control signal obtained by each pixel driving circuit is the same; when the PWM signal driving is different, the EM control signal obtained by the pixel driving circuit corresponding to different PWM signals is different.

[0216] The four pixel driving circuits also receive different analog voltage data Vdata. The analog voltage data Vdata received by each pixel driving circuit controls whether the pixel driving circuit drives the light emitting unit 813 to emit light.

[0217] The grayscale value range corresponding to the first pixel driving circuit 811 is the first grayscale range, the grayscale value range corresponding to the second pixel driving circuit 812 is the second grayscale range, the grayscale value range corresponding to the third pixel driving circuit is the third grayscale range, and the grayscale value range corresponding to the fourth pixel driving circuit is the fourth grayscale range.

[0218] When the grayscale value in the display data is within the first grayscale range, the analog voltage data received by the first pixel driving circuit 811 controls the first pixel driving circuit 811 to drive the light-emitting element 813. When the grayscale value in the display data is within the second grayscale range, the analog voltage data received by the second pixel driving circuit 812 controls the second pixel driving circuit 812 to drive the light-emitting element 813. When the grayscale value in the display data is within the third grayscale range, the analog voltage data received by the third pixel driving circuit 813 controls the third pixel driving circuit to drive the light-emitting element 813. When the grayscale value in the display data is within the fourth grayscale range, the analog voltage data received by the fourth pixel driving circuit 814 controls the fourth pixel driving circuit to drive the light-emitting element 813.

[0219] The circuit structures of the pixel driving circuits may be the same or different, and are not specifically limited here.

[0220] The circuit structure of each pixel driving circuit may be 2T1C, or may be 4T1C, 6T1C, 7T1C, or 8T2C improved based on 2T1C, which is not specifically limited here.

[0221] In the above technical solution, each pixel circuit 810 includes at least two pixel driving circuits, each pixel driving circuit corresponds to a different grayscale value range and gamma curve. When obtaining display data, the grayscale value range that matches the display data is determined according to the grayscale value in the display data, so as to select the corresponding pixel driving circuit to drive the light-emitting element to emit light. By adjusting the gamma curve applied to each grayscale value range, the mapping accuracy of the display data within each grayscale value range and the driving current generated by the pixel driving circuit can be guaranteed. At the same time, the control of each grayscale range does not affect each other, thereby ensuring the light-emitting accuracy of the light-emitting element.

[0222] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0223] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display device, characterized in that: It includes a control circuit, a gamma module, a data driving circuit and a display panel; The display panel includes a pixel unit, and the pixel unit is at least one, including a pixel driving circuit and a light emitting element; The number of the gamma modules, the data driving circuits, and the pixel driving circuits in each of the pixel units is the same, which is at least 2; The control circuit is electrically connected to the gamma module and the data driving circuit, the gamma module is electrically connected to the data driving circuit in a one-to-one correspondence, each of the data driving circuits is electrically connected to a pixel driving circuit in each of the pixel units, and the pixel driving circuit in each pixel unit is electrically connected to the light emitting element; Among them, the correspondingly connected gamma module, data driving circuit and pixel driving circuit are used to transmit and process the original grayscale values ​​in the original display data within the same first preset grayscale range, and different pixel driving circuits in the pixel unit correspond to different first preset grayscale ranges.

2. The display device according to claim 1, characterized in that The gamma module is provided with a plurality of binding point voltage output terminals, the data driving circuit is provided with a plurality of binding point voltage input terminals, and the plurality of binding point voltage output terminals of the gamma module and the plurality of binding point voltage input terminals of the data driving circuit are electrically connected correspondingly; The control circuit is configured to obtain original display data, generate at least one first display data according to the original display data and at least two first preset grayscale ranges, transmit each first display data to a corresponding data driving circuit, and transmit a reference voltage of a gamma curve corresponding to the first display data to a corresponding gamma module; Each gamma module corresponds to a different gamma curve, and the gamma module is configured to output voltage values ​​corresponding to the corresponding gamma curve at multiple preset grayscales from the multiple binding point voltage output terminals according to the reference voltage; The data driving circuit is configured to output an analog data voltage according to the first display data and voltage values ​​corresponding to a plurality of preset grayscales provided by the gamma module; The pixel driving circuit is configured to generate a driving signal according to the analog data voltage to drive the light emitting element to emit light.

3. The display device according to claim 2, characterized in that: The data driving circuit is configured to output an analog data voltage according to the first display data and voltage values ​​corresponding to a plurality of preset grayscales provided by the gamma module, specifically comprising: The data driving circuit is configured to determine, when the grayscale value in the first display data is the preset grayscale, a voltage value corresponding to the preset grayscale provided by the gamma module as the analog data voltage; When the grayscale value in the first display data is between two preset grayscales, an interpolation calculation is performed between the voltage values ​​corresponding to the two preset grayscales provided by the gamma module to determine the analog data voltage.

4. The display device according to claim 2 or 3, characterized in that: The original display data includes the original grayscale value corresponding to each pixel unit; The control circuit is configured to obtain original display data, and generate at least one first display data according to the original display data and at least two first preset grayscale ranges, specifically including: The control circuit is configured to obtain a frame of original display data, and divide the original grayscale values ​​in the original display data using a plurality of first preset grayscale ranges to obtain at least one group of original grayscale sets; each group of original grayscale sets includes at least one original grayscale value within a corresponding first preset grayscale range; Using each group of original grayscale sets, corresponding first display data is generated; the brightness generated by the pixel driving circuit driving the light-emitting element controlled by the original grayscale value in the original grayscale set is the same as the brightness generated by the pixel driving circuit driving the light-emitting element controlled by the first grayscale value corresponding to the original grayscale value in the first display data.

5. The display device according to claim 4, characterized in that: The control circuit is configured to obtain a frame of original display data, and divide each original grayscale value in the original display data by using a plurality of first preset grayscale ranges to obtain at least one set of original grayscale sets, specifically including: Acquire a basic gamma curve and a plurality of preset analog data voltage ranges corresponding to the original display data, each of the preset analog data voltage ranges including a maximum value and a minimum value; Processing the maximum value and the minimum value of each of the preset analog data voltage ranges using the basic gamma curve to obtain the maximum value and the minimum value of the corresponding first preset grayscale range; Determine each of the first preset grayscale ranges according to the maximum value and the minimum value of each of the first preset grayscale ranges; The original grayscale values ​​in the original display data are divided by using a plurality of first preset grayscale ranges to obtain at least one group of original grayscale sets, each of which includes an original grayscale value corresponding to at least one pixel unit.

6. The display device according to claim 4, characterized in that: The plurality of first preset grayscale ranges include a plurality of grayscale mapping grayscale ranges, and the original grayscale value in each of the original grayscale sets is within the corresponding grayscale mapping grayscale range; Using each set of original grayscale sets to generate corresponding first display data specifically includes: Generate corresponding second display data using the original grayscale values ​​in each group of the original grayscale sets; the second display data includes the original grayscale values ​​or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale values ​​in the second display data are in the original grayscale sets corresponding to the second display data; Mapping each of the second display data to the first display data using a grayscale mapping table; Wherein, each of the second display data corresponds to the same set of basic gamma curves, and each of the first display data corresponds to different sets of grayscale mapping gamma curves; A grayscale span value of the original grayscale value in the second display data is smaller than a grayscale span value of the first grayscale value corresponding to the original grayscale value in the first display data; The voltage value determined by the original grayscale value in the second display data in the basic gamma curve is the same as the voltage value determined by the first grayscale value corresponding to the original grayscale value in the first display data in the corresponding grayscale mapping gamma curve.

7. The display device according to claim 6, characterized in that: The grayscale mapping table includes a mapping relationship between a plurality of preset original grayscale values ​​in a basic gamma curve and a plurality of preset first grayscale values ​​in a corresponding grayscale mapping gamma curve; Mapping each of the second display data to the first display data using the grayscale mapping table specifically includes: If the original grayscale value in the second display data is the preset original grayscale value, determining a preset first grayscale value corresponding to the preset original grayscale value from the grayscale mapping table; If the original grayscale value in the second display data is between two preset original grayscale values, two preset first grayscale values ​​corresponding to the two preset original grayscale values ​​are determined from the grayscale mapping table, and the first grayscale value corresponding to the original grayscale value is determined by interpolation calculation; The first display data is constructed using the first grayscale value.

8. The display device according to claim 4, characterized in that: The plurality of first preset grayscale ranges include a plurality of voltage-mapped grayscale ranges, and the original grayscale value in each of the original grayscale sets is within the corresponding voltage-mapped grayscale range; Using each set of original grayscale sets to generate corresponding first display data specifically includes: Generate corresponding first display data using the original grayscale values ​​in each group of the original grayscale sets, wherein the first display data includes the original grayscale values ​​or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale values ​​in the first display data are in the original grayscale sets corresponding to the first display data; Wherein, each of the first display data corresponds to a different group of voltage mapping gamma curves; A voltage span value corresponding to an original grayscale value in the first display data in a corresponding voltage mapping gamma curve is greater than a voltage span value corresponding to the original grayscale value in a basic gamma curve.

9. The display device according to claim 4, characterized in that: The plurality of first preset grayscale ranges include a plurality of voltage-mapped grayscale ranges and a plurality of grayscale-mapped grayscale ranges, and the original grayscale value in each of the original grayscale sets is within the corresponding voltage-mapped grayscale range; Using each set of original grayscale sets to generate corresponding first display data specifically includes: Generate corresponding third display data using the grayscale values ​​in each group of the original grayscale sets, each of the third display data includes an original grayscale value or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale value in the third display data is in the original grayscale set corresponding to the third display data; Generate at least one fourth display data according to each of the third display data and the plurality of grayscale mapping grayscale ranges, wherein each of the fourth display data includes an original grayscale value or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale value in the fourth display data is within the grayscale mapping grayscale range corresponding to the fourth display data; Mapping each of the fourth display data to the first display data using a grayscale mapping table; Wherein, each of the third display data corresponds to a different group of voltage mapping gamma curves, and a voltage span value corresponding to an original grayscale value in the third display data in the corresponding voltage mapping gamma curve is greater than a voltage span value corresponding to the basic gamma curve; Each of the first display data corresponds to a different group of voltage-grayscale mapping gamma curves; A grayscale span value of the original grayscale value in the fourth display data is smaller than a grayscale span value of the first grayscale value corresponding to the original grayscale value in the first display data; The voltage value determined by the original grayscale value in the fourth display data in the voltage-to-grayscale mapping gamma curve is the same as the voltage value determined by the first grayscale value corresponding to the original grayscale value in the first display data in the voltage-to-grayscale mapping gamma curve.

10. The display device according to claim 4, characterized in that The plurality of first preset grayscale ranges include a plurality of voltage mapping grayscale ranges and a plurality of grayscale mapping grayscale ranges, and the original grayscale value in each of the original grayscale sets is within the corresponding grayscale mapping grayscale range; Using each set of original grayscale sets to generate corresponding first display data specifically includes: Generate corresponding fifth display data using the grayscale values ​​in each group of the original grayscale sets, each of the fifth display data includes an original grayscale value or black insertion data corresponding to each pixel unit in the display panel, and the original grayscale value in the fifth display data is in the original grayscale set corresponding to the fifth display data; Using a grayscale mapping table, each of the fifth display data is mapped to the sixth display data; the grayscale span value of the original grayscale value in the fifth display data is smaller than the grayscale span value of the first grayscale value corresponding to the original grayscale value in the sixth display data; Generate a plurality of first display data according to the sixth display data and the plurality of voltage mapping grayscale ranges, each of the first display data comprising a first grayscale value or black insertion data corresponding to each pixel unit, and a first grayscale value in the first display data is within the voltage mapping grayscale range corresponding to the first display data; wherein each of the fifth display data corresponds to the same group of basic gamma curves, each of the sixth display data corresponds to different groups of grayscale mapping gamma curves, and a voltage value determined by an original grayscale value in the fifth display data in the basic gamma curve is the same as a voltage value determined by a first grayscale value corresponding to the original grayscale value in the sixth display data in the corresponding grayscale mapping gamma curve; Each of the first display data corresponds to a different group of voltage-grayscale mapping gamma curves; A voltage span value corresponding to a first grayscale value in the first display data in a corresponding grayscale-voltage mapping gamma curve is greater than a voltage span value in the corresponding grayscale mapping gamma curve.

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