Display device and driving method thereof

Abstract

The invention provides a display device and a driving method thereof. The display device comprises a display panel, a control module, a gamma voltage module and a source electrode driving module. The display panel comprises a plurality of data lines; the gamma voltage module generates a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages according to the gamma polarity control signal output by the control module; the source electrode driving module is electrically connected with the control module, the gamma voltage module and the plurality of data lines, the source electrode driving module comprises a plurality of output groups, and each output group is electrically connected with the corresponding data line through a plurality of output channels of the source electrode driving module; the control module is used for correspondingly generating a plurality of positive polarity data signals and a plurality of negative polarity data signals according to a plurality of positive polarity gamma voltages, a plurality of negative polarity gamma voltages and a clock control signal and a data latch control signal output by the control module, and selecting a corresponding output group according to the gamma polarity control signal; and outputting the plurality of positive polarity data signals or the plurality of negative polarity data signals to the corresponding data lines.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display device and a driving method thereof. Background Art

[0002] The gamma voltage module needs to have a built-in voltage regulator module and a voltage follower to achieve adjustable gamma voltage and high driving force. When the display panel is displaying, two sets of voltage regulator modules and voltage followers need to be set inside the gamma voltage module to output positive and negative gamma voltages at the same time. However, setting up two sets of voltage regulator modules and voltage followers will increase the layout space occupied, resulting in an increase in the size of the driver chip and an increase in cost. Summary of the invention

[0003] The embodiments of the present invention provide a display device and a driving method thereof, which can improve the problem that the gamma voltage module is large in size and high in cost.

[0004] An embodiment of the present invention provides a display device, including a display panel, a control module, a gamma voltage module and a source driving module. The display panel includes a plurality of data lines; the control module is configured to generate a gamma polarity control signal, a clock control signal and a data latch control signal; the gamma voltage module is electrically connected to the control module, and the gamma voltage module is configured to generate a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages according to the gamma polarity control signal; the source driving module is electrically connected to the control module, the gamma voltage module and the plurality of data lines, and the source driving module includes a plurality of output groups, each of which is electrically connected to the corresponding data lines through a plurality of output channels of the source driving module; wherein the source driving module is configured to generate a plurality of positive polarity data signals and a plurality of negative polarity data signals according to the clock control signal, the data latch control signal, the plurality of positive polarity gamma voltages and the plurality of negative polarity gamma voltages, and select the corresponding output group according to the gamma polarity control signal, and output the plurality of positive polarity data signals or the plurality of negative polarity data signals to the corresponding data lines.

[0005] Optionally, in some embodiments of the present invention, the gamma polarity control signal has a first level state and a second level state. The gamma voltage module is configured to generate a plurality of positive polarity gamma voltages according to a rising edge of the gamma polarity control signal changing from the first level state to the second level state; and to generate a plurality of negative polarity gamma voltages according to a falling edge of the gamma polarity control signal changing from the second level state to the first level state.

[0006] Optionally, in some embodiments of the present invention, the gamma voltage module includes a gamma power supply unit, a voltage generating unit, a first gamma register, and a second gamma register. The gamma power supply unit is electrically connected to the control module, and the gamma power supply unit is configured to generate a plurality of first gamma reference voltages according to the rising edge, the received first power reference voltage, and the second power reference voltage, and to generate a plurality of second gamma reference voltages according to the falling edge, the received third power reference voltage, and the fourth power reference voltage. The voltage generating unit is electrically connected to the gamma power supply unit; the first gamma register is electrically connected to the control module and the voltage generating unit, and is configured to control the voltage generating unit to generate a plurality of positive polarity gamma voltages according to the plurality of first gamma reference voltages according to the rising edge; the second gamma register is electrically connected to the control module and the voltage generating unit, and is configured to control the voltage generating unit to generate a plurality of negative polarity gamma voltages according to the plurality of second gamma reference voltages according to the falling edge.

[0007] Optionally, in some embodiments of the present invention, the gamma power supply unit includes a first operational amplifier, a second amplifier, and a plurality of first resistors. The non-inverting input terminal of the first operational amplifier is configured to receive the first power supply reference voltage or the third power supply reference voltage, and the inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the first operational amplifier; the non-inverting input terminal of the second operational amplifier is configured to receive the second power supply reference voltage or the fourth power supply reference voltage, and the inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the second operational amplifier; and the plurality of first resistors are connected in series between the output terminal of the first operational amplifier and the output terminal of the second operational amplifier.

[0008] Optionally, in some embodiments of the present invention, the voltage generating unit includes a plurality of first digital-to-analog conversion circuits, a plurality of voltage followers, and a polarity voltage generating circuit. The plurality of first digital-to-analog conversion circuits are electrically connected to the first gamma register, the second gamma register, and the gamma power supply unit, and are configured to generate a plurality of first binding point voltages according to a plurality of first gamma reference voltages under the control of the first gamma register, and to generate a plurality of second binding point voltages according to a plurality of second gamma reference voltages under the control of the second gamma register. The plurality of voltage followers are electrically connected to the plurality of digital-to-analog conversion circuits; the polarity voltage generating circuit is electrically connected to the plurality of voltage followers, and is configured to generate a plurality of positive polarity gamma voltages according to a plurality of first binding point voltages, and to generate a plurality of negative polarity gamma voltages according to a plurality of second binding point voltages.

[0009] Optionally, in some embodiments of the present invention, the plurality of data lines include a plurality of first data lines and a plurality of second data lines, and the first data lines and the second data lines are arranged alternately; the plurality of output groups include a plurality of first output groups and a plurality of second output groups; each of the first output groups is electrically connected to the corresponding first data line through an odd-numbered output channel of the plurality of output channels, and each of the second output groups is electrically connected to the corresponding second data line through an even-numbered output channel of the plurality of output channels.

[0010] Optionally, in some embodiments of the present invention, the gamma polarity control signal has multiple jumps between the first level state and the second level state; the source driver module is configured to select the corresponding first output group according to different rising edges to output the positive polarity data signal to the corresponding first data line; and, select the corresponding second output group according to different falling edges to output the negative polarity data signal to the corresponding second data line.

[0011] Optionally, in some embodiments of the present invention, the source driver module includes a shift register, a latch, a level conversion circuit, a second digital-to-analog conversion circuit, and an output buffer. The shift register is electrically connected to the control module and configured to generate a sampling signal according to the clock control signal; the latch is electrically connected to the control module and the shift register, configured to generate a plurality of first data voltages according to the sampling signal and the received image signal, and latch or release a plurality of first data voltages according to the data latch control signal; the level conversion circuit is electrically connected to the latch, configured to generate a plurality of second data voltages according to a plurality of first data voltages. The second digital-to-analog conversion circuit is electrically connected to the level conversion circuit and the gamma voltage module, configured to generate a plurality of positive polarity grayscale voltages according to a plurality of second data voltages and the positive polarity gamma voltage; and, to generate a plurality of negative polarity grayscale voltages according to a plurality of second data voltages and a plurality of negative polarity gamma voltages. The output buffer is electrically connected to the second digital-to-analog conversion circuit, and includes a plurality of the output groups. The output buffer is configured to generate a plurality of the positive polarity data signals according to a plurality of the positive polarity grayscale voltages, and to generate a plurality of the negative polarity data signals according to a plurality of the negative polarity grayscale voltages.

[0012] The present invention also provides a method for driving a display device, which is used to drive any of the above-mentioned display devices, including: selecting the corresponding output group according to the gamma polarity control signal, and generating multiple positive polarity gamma voltages or multiple negative polarity gamma voltages; generating multiple positive polarity data signals or multiple negative polarity data signals according to the clock control signal, the data latch control signal and the multiple positive polarity gamma voltages or the multiple negative polarity gamma voltages, so as to output the multiple positive polarity data signals or the multiple negative polarity data signals through the selected output group.

[0013] Optionally, in some embodiments of the present invention, the step of selecting the corresponding output group according to the gamma polarity control signal and generating multiple positive polarity gamma voltages or multiple negative polarity gamma voltages includes: selecting a corresponding output group according to the rising edge of the gamma polarity control signal jumping from the first level state to the second level state, and generating multiple positive polarity gamma voltages; selecting a corresponding output group according to the falling edge of the gamma polarity control signal jumping from the second level state to the first level state, and generating multiple negative polarity gamma voltages.

[0014] An embodiment of the present invention provides a display device and a driving method thereof, which controls a source driving module to select a corresponding output group by using a gamma polarity control signal generated by a control module, and controls a gamma voltage module to generate a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages, so that the source driving module generates a plurality of positive polarity data signals or a plurality of negative polarity data signals according to the plurality of positive polarity gamma voltages or the plurality of negative polarity gamma voltages in cooperation with a clock control signal and a data latch control signal generated by the control module, thereby outputting the plurality of positive polarity data signals or the plurality of negative polarity data signals to the corresponding data lines through the selected output group. By using the gamma polarity control signal to select the polarity of the gamma voltage output by the gamma voltage module and the output channel of the source driving module, the gamma voltage module can output the positive polarity gamma voltage and the negative polarity gamma voltage in time-sharing, and then the source driving module outputs the positive polarity data signal or the negative polarity data signal to the corresponding data line through the selected output channel according to the received positive polarity gamma voltage or the negative polarity gamma voltage, so as to realize the synchronization of the switching of the positive polarity gamma voltage and the negative polarity gamma voltage and the switching of the positive polarity data signal and the negative polarity data signal. By making the gamma voltage module output the positive polarity gamma voltage and the negative polarity gamma voltage in time-sharing, the problem that the gamma voltage module needs to set two sets of voltage regulating modules and voltage followers to generate the positive polarity gamma voltage and the negative polarity gamma voltage correspondingly is improved, which then leads to the problem that the gamma voltage module is large in size and high in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1A It is a schematic diagram of the structure of a driver chip in the prior art;

[0017] Figure 1B is a structural schematic diagram of a gamma voltage module of the prior art;

[0018] Figure 1C It is a schematic diagram of the output mode of the output channel of the prior art;

[0019] Figure 2 is a schematic structural diagram of a display device provided by an embodiment of the present invention;

[0020] Figure 3 is a connection diagram of a control module, a gamma voltage module and a source driving module provided by an embodiment of the present invention;

[0021] Figure 4 is a timing diagram of a gamma polarity control signal provided by an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of an output mode of an output channel provided by an embodiment of the present invention;

[0023] Figure 6 is a structural schematic diagram of a gamma voltage module provided by an embodiment of the present invention;

[0024] Figure 7 is a flow chart of a method for driving a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0026] Specifically, Figure 1A It is a schematic diagram of the structure of the driver chip of the prior art. Figure 1B is a structural schematic diagram of a gamma voltage module of the prior art; Figure 1C This is a schematic diagram of the output mode of the output channel of the prior art. Among them, CTL1 and CTL2 represent registers, VGMA_UH, VGMA_UL, VGMA_LH, and VGMA_LL represent external input power reference voltages; VG1 to VG1024 represent gamma reference voltages, DAC2 to DAC8 and DAC11 to DAC17 represent digital-to-analog conversion circuits, GOP1 to GOP14 represent voltage followers, Gamma-R represents resistor strings, and iGMA2 to iGMA8 and iGMA10 to iGMA17 represent tie point voltages, respectively. TESTO5 and VGMA_OUT represent control signals output by the gamma voltage module.

[0027] The existing driver chip needs to set up two sets of voltage regulation modules and voltage followers (such as Figure 1A to Figure 1B 10A and 10B in order to pass multiple output channels (such as Figure 1C CH1~CH960 in the output positive and negative polarity gamma voltage, the gamma voltage module occupies a large layout space, resulting in a larger driver chip size and higher cost.

[0028] Figure 2 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention, Figure 3 The embodiment of the present invention provides a display device, including a display panel 201, a control module 202, a gamma voltage module 203 and a source driving module 204.

[0029] The display panel 201 includes a plurality of data lines DL and a plurality of sub-pixels Pi, and the plurality of data lines DL and the plurality of sub-pixels Pi are electrically connected.

[0030] Optionally, a plurality of the data lines DL are arranged along a first direction, and each of the data lines DL extends along a second direction crossing the first direction.

[0031] Optionally, the plurality of data lines DL include a plurality of first data lines DL1 and a plurality of second data lines DL2 , and the first data lines DL1 and the second data lines DL2 are alternately arranged in the first direction.

[0032] The control module 202 is electrically connected to the display panel 201 , and is configured to generate a gamma polarity control signal GPCS, a clock control signal CK, and a data latch control signal TP.

[0033] Optionally, the control module 202 includes a timing controller, a central processing unit, a logic controller, etc.

[0034] The Gamma voltage module 203 is electrically connected to the control module 202 , and is configured to generate a plurality of positive polarity Gamma voltages or a plurality of negative polarity Gamma voltages according to the Gamma polarity control signal GPCS.

[0035] Optionally, the gamma voltage module 203 is configured to realize time-sharing output of the plurality of positive polarity gamma voltages and the plurality of negative polarity gamma voltages according to the level state of the gamma polarity control signal GPCS. That is, the gamma voltage module 203 controls the generation of the plurality of positive polarity gamma voltages or the plurality of negative polarity gamma voltages according to the level change state of the gamma polarity control signal GPCS, so that when the display panel 201 needs the positive polarity data signal or the negative polarity data signal, the polarity of the data signal can be quickly switched.

[0036] Optionally, Figure 4 It is a timing diagram of the gamma polarity control signal GPCS provided by an embodiment of the present invention. The gamma polarity control signal GPCS has a first level state and a second level state. The voltage value corresponding to the first voltage state is less than the voltage value corresponding to the second level state. The gamma voltage module 203 realizes fast switching between outputting multiple positive polarity gamma voltages and outputting multiple negative polarity gamma voltages at the rising edge RE when the gamma polarity control signal GPCS jumps from the first level state to the second level state and at the falling edge FE when the gamma polarity control signal GPCS jumps from the second level state to the first level state.

[0037] Optionally, the gamma voltage module 203 is configured to generate a plurality of the positive polarity gamma voltages according to a rising edge RE when the gamma polarity control signal GPCS jumps from the first level state to the second level state; and to generate a plurality of the negative polarity gamma voltages according to a falling edge FE when the gamma polarity control signal GPCS jumps from the second level state to the first level state.

[0038] By enabling the gamma voltage module 203 to output the positive polarity gamma voltage and the negative polarity gamma voltage in time-sharing manner according to the gamma polarity control signal GPCS, the problem that the gamma voltage module 203 needs to be provided with two sets of voltage regulating modules and voltage followers to correspondingly generate the positive polarity gamma voltage and the negative polarity gamma voltage is improved, which in turn leads to the problem that the gamma voltage module 203 is larger in size and higher in cost.

[0039] Please continue reading Figure 2 to Figure 4In order to adapt the positive polarity gamma voltage and negative polarity gamma voltage outputted by the gamma voltage module 203 in a time-sharing manner, the display device has better display performance. The source driving module 204 selects different output channels CH according to the gamma polarity control signal GPCS to transmit the required positive polarity data signal or negative polarity data signal to different data lines DL.

[0040] Optionally, the source driver module 204 is electrically connected to the control module 202, the gamma voltage module 203 and the plurality of data lines DL, and the source driver module 204 includes a plurality of output groups, each of which is electrically connected to the corresponding data lines DL through a plurality of output channels CH of the source driver module 204. The source driver module 204 is configured to generate a plurality of positive polarity data signals and a plurality of negative polarity data signals according to the clock control signal CK, the data latch control signal TP, a plurality of positive polarity gamma voltages and a plurality of negative polarity gamma voltages, and select the corresponding output group according to the gamma polarity control signal GPCS, and output the plurality of positive polarity data signals or the plurality of negative polarity data signals to the corresponding data lines DL.

[0041] Optionally, the source driver module 204 generates multiple positive polarity data signals according to the clock control signal CK, the data latch control signal TP and the multiple positive polarity gamma voltages, and the source driver module 204 generates multiple negative polarity data signals according to the clock control signal CK, the data latch control signal TP and the multiple negative polarity gamma voltages.

[0042] Optionally, in order to enable the display panel 201 to realize functions such as column inversion (i.e., when the first data line DL1 receives a positive polarity data signal, the second data line DL2 receives a negative polarity data signal; or, when the second data line DL2 receives a positive polarity data signal, the first data line DL1 receives a negative polarity data signal), the output channels CH corresponding to the multiple output groups can be grouped by odd and even.

[0043] Optionally, the multiple output groups include multiple first output groups GP1 and multiple second output groups GP2; each of the first output groups GP1 is electrically connected to the corresponding first data line DL1 through the odd output channels (such as CH1, CH3, ... etc.) of the multiple output channels CH, and each of the second output groups GP2 is electrically connected to the corresponding second data line DL2 through the even output channels (such as CH2, CH4, ... etc.) of the multiple output channels CH, and the source driver module 204 selects the first output group GP1 or the second output group GP2 according to the gamma polarity control signal GPCS, so as to output data signals to the corresponding first data line DL1 or the second data line DL2 through the output channel CH electrically connected to the selected output group, so as to realize display requirements such as column inversion, dot inversion or frame inversion.

[0044] Optionally, the source driving module 204 selects the first output group GP1 according to the rising edge RE of the gamma polarity control signal GPCS, so as to output the positive polarity data signal to the corresponding first data line DL1 through the odd output channels electrically connected to the selected first output group GP1. The source driving module 204 selects the second output group GP2 according to the falling edge FE of the gamma polarity control signal GPCS, so as to output the negative polarity data signal to the corresponding second data line DL2 through the even output channels electrically connected to the selected second output group GP2.

[0045] Optionally, the plurality of output channels CH may be evenly divided into m groups, each group including n output channels CH, wherein m is greater than 1, and n is greater than or equal to 1. Accordingly, the source driver module 204 has m output groups (i.e., output groups correspond to groups of the output channels CH one by one), and each output group is electrically connected to the corresponding data line DL through n output channels CH.

[0046] like Figure 5 Schematic diagram of the output mode of the output channel provided by an embodiment of the present invention, the source driver module 204 has 960 output channels CH1~CH960, and the 960 output channels CH1~CH960 can be evenly divided into 80 groups, each group including 12 output channels. Correspondingly, the source driver module 204 has 80 output groups, and each of the output groups is electrically connected to the corresponding data line DL through the 12 output channels. Optionally, the output channels CH corresponding to 40 of the 80 output groups (i.e., 40 first output groups GP1) are electrically connected to the multiple first data lines DL1, and the output channels CH corresponding to the other 40 of the 80 output groups (i.e., 40 second output groups GP2) are electrically connected to the multiple second data lines DL2.

[0047] Optionally, each of the first output groups GP1 corresponds to a continuous odd-numbered output channel, each of the second output groups GP2 corresponds to a continuous even-numbered output channel, and the data lines DL electrically connected to the output channels CH correspond to the number of output channels CH (that is, in the first direction, the first data line DL among the multiple data lines DL is electrically connected to the output channel CH1, the second data line DL among the multiple data lines DL is electrically connected to the output channel CH2, and so on to obtain the connection conditions between the remaining output channels CH and the data lines DL), so that the display panel 201 displays continuously.

[0048] For example, the source driver module 204 has 960 output channels CH1-CH960, and the 960 output channels CH1-CH960 can be evenly divided into 80 groups. The first output group GP11 of the plurality of first output groups GP1 is electrically connected to the first data line DL11 (i.e., the first data line DL1), the third data line DL13 (i.e., the first data line DL1), ..., the twenty-third data line DL123 (i.e., the first data line DL1) among the plurality of data lines DL through odd channels CH1, CH3, CH5, CH7, CH9, CH11, CH13, CH15, CH17, CH19, CH21, CH23, so that the first data line DL11, the third data line DL13, ..., the twenty-third data line DL23 simultaneously receive positive polarity data signals. The first output group GP21 of the plurality of second output groups GP2 is electrically connected to the second data line DL22 (i.e., the second data line DL2), the fourth data line DL24 (i.e., the second data line DL2), ..., the twenty-fourth data line DL24 (i.e., the second data line DL2) among the plurality of data lines DL through the even channels CH2, CH4, CH6, CH8, CH10, CH12, CH14, CH16, CH18, CH20, CH22, and CH24, so that the second data line DL22, the fourth data line DL24, ..., the twenty-fourth data line DL224 simultaneously receive the negative polarity data signal; and so on, until the last output group of the plurality of second output groups GP2 is electrically connected to the corresponding second data line DL2 through the even channels CH938, CH940, CH942, CH944, CH946, CH948, CH950, CH952, CH954, CH956, CH958, and CH960.

[0049] Optionally, see Figure 4, according to the transition of the gamma polarity control signal GPCS between the first level state and the second level state, the plurality of output groups can transmit data signals to the corresponding data lines DL through the corresponding output channels CH. That is, the gamma polarity control signal GPCS has multiple transitions between the first level state and the second level state; the source driving module 204 is configured to select the corresponding first output group GP1 according to different rising edges RE to output the positive polarity data signal to the corresponding first data line DL1; and, according to different falling edges FE, select the corresponding second output group GP2 to output the negative polarity data signal to the corresponding second data line DL2.

[0050] Please continue reading Figure 4-5, for example, the source driver module 204 has 960 output channels CH1-CH960, and the 960 output channels CH1-CH960 are evenly divided into 80 groups, and the first output group GP11 of the plurality of first output groups GP1 is electrically connected to the first data line DL11, the third data line DL13, ..., the twenty-third data line DL123 of the plurality of data lines DL through the odd channels CH1, CH3, CH5, CH7, CH9, CH11, CH13, CH15, CH17, CH19, CH21, CH23. The first output group GP21 of the plurality of second output groups GP2 is electrically connected to the second data line DL24, the fourth data line DL24, ..., the twenty-fourth data line DL224 of the plurality of data lines DL through the even channels CH2, CH4, CH6, CH8, CH10, CH12, CH14, CH16, CH18, CH20, CH22, CH24. The second output group GP12 of the multiple first output groups GP1 is electrically connected to the twenty-fifth data line, the twenty-seventh data line, ..., the forty-seventh data line of the multiple data lines DL through odd channels CH25, CH27, CH29, CH31, CH33, CH35, CH37, CH39, CH41, CH43, CH45, CH47. Then, the source driver module 204 selects the first output group GP11 of the first output groups GP1 at the first rising edge RE1 of the gamma polarity control signal GPCS to simultaneously output the positive polarity data signal to the first data line DL11, the third data line DL13, ..., the twenty-third data line DL123; the source driver module 204 selects the first output group GP21 of the second output group GP2 at the first falling edge FE1 of the gamma polarity control signal GPCS to output the negative polarity data signal to the second data line DL22, the fourth data line DL24, ..., the twenty-fourth data line DL224; the source driver module 204 selects the second output group GP12 of the first output group GP1 at the second rising edge RE2 of the gamma polarity control signal GPCS to simultaneously output the positive polarity data signal to the twenty-fifth data line, the twenty-seventh data line, ..., the forty-seventh data line; and so on, the source driver module 204 outputs data signals to the remaining data lines DL.

[0051] Optionally, the fewer the number of output channels CH corresponding to each output group, the more the number of output groups, the more times the gamma polarity control signal GPCS changes between the first level state and the second level state, and the higher the control complexity of the display device; and the more the number of output channels CH corresponding to each output group, the fewer the number of output groups, the longer the time interval for the display panel 201 to receive the positive polarity data signal and the negative polarity data signal, which is not conducive to making the display device show better display performance. In order to take into account both power consumption and display performance, the number of output channels CH included in each group is greater than 1, and accordingly, each of the output groups is electrically connected to the corresponding data line DL through multiple (i.e., greater than 1) output channels CH. Optionally, each of the output groups can be electrically connected to the corresponding data line DL through 2, 5, 10, 12, 15, 20, 24, 30, etc. output channels CH.

[0052] like Figure 6 2 is a schematic diagram of the structure of a gamma voltage module provided by an embodiment of the present invention. The gamma voltage module 203 includes a gamma power supply unit 2031, a voltage generating unit 2032, a first gamma register CTL1 and a second gamma register CTL2.

[0053] Please continue reading Figure 3 and Figure 6 The gamma power supply unit 2031 is electrically connected to the control module 202, and the gamma power supply unit 2031 is configured to generate a plurality of first gamma reference voltages according to the rising edge RE, the received first power supply reference voltage VGMA_UH and the second power supply reference voltage VGMA_UL, and to generate a plurality of second gamma reference voltages according to the falling edge FE, the received third power supply reference voltage VGMA_LH and the fourth power supply reference voltage VGMA_LL.

[0054] Optionally, the first power supply reference voltage VGMA_UH is greater than the second power supply reference voltage VGMA_UL, and the third power supply reference voltage VGMA_LH is greater than the fourth power supply reference voltage VGMA_LL. The gamma power supply unit 2031 can generate z1 first gamma reference voltages and generate z1 second gamma reference voltages. Where z1 is equal to 256, 512, 1024, etc. Where, Figure 6 VG1 to VG512 in φ represents the first gamma reference voltage or the second gamma reference voltage.

[0055] Optionally, the gamma power supply unit 2031 includes a first operational amplifier OP1, a second amplifier, and a plurality of first resistors R1. The non-inverting input terminal of the first operational amplifier OP1 is configured to receive the first power supply reference voltage VGMA_UH or the third power supply reference voltage VGMA_LH, and the inverting input terminal of the first operational amplifier OP1 is electrically connected to the output terminal of the first operational amplifier OP1; the non-inverting input terminal of the second operational amplifier OP2 is configured to receive the second power supply reference voltage VGMA_UL or the fourth power supply reference voltage VGMA_LL, and the inverting input terminal of the second operational amplifier OP2 is electrically connected to the output terminal of the second operational amplifier OP2; and the plurality of first resistors R1 are connected in series between the output terminal of the first operational amplifier OP1 and the output terminal of the second operational amplifier OP2.

[0056] Please continue reading Figure 6 The voltage generating unit 2032 is electrically connected to the gamma power supply unit 2031, and the voltage generating unit 2032 is configured to generate a plurality of the positive polarity gamma voltages according to a plurality of the first gamma reference voltages, and to generate a plurality of the negative polarity gamma voltages according to a plurality of the second gamma reference voltages.

[0057] Optionally, the voltage generating unit 2032 includes a plurality of first digital-to-analog conversion circuits (such as Figure 6 DAC2~DAC8 in the ... Figure 6 GOP1~GOP7) and polarity voltage generating circuit (such as Figure 6 It is implemented in the form of a Gamma-R resistor string in the circuit).

[0058] The plurality of first digital-to-analog conversion circuits are electrically connected to the first gamma register CTL1, the second gamma register CTL2 and the gamma power supply unit 2031, and are configured to generate a plurality of first binding point voltages (such as Figure 6 VGMA_UH, VGMA_UL, GMA2-IN~GMA8-IN in the second gamma register CTL2, and generating a plurality of second binding point voltages (such as Figure 6 VGMA_LH, VGMA_LL, GMA11-IN~GMA17-IN).

[0059] Optionally, the plurality of the first digital-to-analog conversion circuits may obtain z2 first binding point voltages and z2 second binding point voltages. Wherein, z2 is determined based on a standard that enables drawing a gamma curve. Optionally, z2 is greater than 1. Optionally, z2 is equal to 5, 9, 15, etc.

[0060] The plurality of voltage followers are electrically connected to the plurality of digital-to-analog conversion circuits to achieve a stable amplification function.

[0061] The polarity voltage generating circuit is electrically connected to the plurality of voltage followers, and the polarity voltage generating circuit is configured to generate a plurality of the positive polarity gamma voltages (such as Figure 6 G0+~G255+ in ), generating a plurality of the negative polarity gamma voltages (such as Figure 6 G0-~G255-).

[0062] Please continue reading Figure 4 and Figure 6 The first gamma register CTL1 is electrically connected to the control module 202 and the voltage generating unit 2032, and the first gamma register CTL1 is configured to control the voltage generating unit 2032 to generate a plurality of positive polarity gamma voltages according to a plurality of the first gamma reference voltages according to the rising edge RE.

[0063] The second gamma register CTL2 is electrically connected to the control module 202 and the voltage generating unit 2032 , and the second gamma register CTL2 is configured to control the voltage generating unit 2032 to generate the plurality of negative polarity gamma voltages according to the plurality of second gamma reference voltages according to the falling edge FE.

[0064] Optionally, see Figure 3 The source driving module 204 includes a shift register 2041 , a latch 2042 , a level conversion circuit 2043 , a second digital-to-analog conversion circuit 2044 and an output buffer 2045 .

[0065] The shift register 2041 is electrically connected to the control module 202 , and is configured to generate a sampling signal according to the clock control signal CK.

[0066] The latch 2042 is electrically connected to the control module 202 and the shift register 2041, and is configured to generate a plurality of first data voltages according to the sampling signal and the received image signal, and latch or release the plurality of first data voltages according to the data latch control signal TP.

[0067] The level conversion circuit 2043 is electrically connected to the latch 2042 and is configured to generate a plurality of second data voltages according to a plurality of the first data voltages.

[0068] The second digital-to-analog conversion circuit 2044 is electrically connected to the level conversion circuit 2043 and the gamma voltage module 203, and is configured to generate a plurality of positive polarity grayscale voltages according to a plurality of the second data voltages and the positive polarity gamma voltages; and to generate a plurality of negative polarity grayscale voltages according to a plurality of the second data voltages and a plurality of the negative polarity gamma voltages. The output buffer 2045 is electrically connected to the second digital-to-analog conversion circuit 2044. The second digital-to-analog conversion circuit 2044 includes a plurality of the output groups, and the output buffer 2045 is configured to generate a plurality of the positive polarity data signals according to a plurality of the positive polarity grayscale voltages, and to generate a plurality of the negative polarity data signals according to a plurality of the negative polarity grayscale voltages.

[0069] Please continue reading Figure 3 to Figure 6 , the working principle of the display device is described by taking the example that the first output group of the plurality of first output groups GP1 is electrically connected to the first data line DL, the third data line DL, ..., the twenty-third data line DL among the plurality of data lines DL through the odd channels CH1, CH3, CH5, CH7, CH9, CH11, CH13, CH15, CH17, CH19, CH21, CH23, and the first output group of the plurality of second output groups GP2 is electrically connected to the second data line DL, the fourth data line DL, ..., the twenty-fourth data line DL among the plurality of data lines DL through the even channels CH2, CH4, CH6, CH8, CH10, CH12, CH14, CH16, CH18, CH20, CH22, CH24.

[0070] The shift register 2041 in the source driving module 204 generates a sampling signal according to the clock control signal CK to output to the latch 2042, so that the latch 2042 generates a plurality of first data voltages corresponding to a plurality of sub-pixels Pi in the same row according to the sampling signal and the received image signal FD, and latches the plurality of first data voltages according to the data latch control signal TP. After the latch 2042 releases the plurality of first data voltages to the level conversion circuit 2043 according to the data latch control signal TP, the level conversion circuit 2043 generates a plurality of second data voltages according to the plurality of first data voltages to output to the second digital-to-analog conversion circuit 2044.

[0071] The gamma voltage module 203 selects the first gamma register CTL1 corresponding to the first rising edge RE1 of the gamma polarity control signal GPCS; the gamma power supply unit 2031 receives the first power supply reference voltage VGMA_UH and the second power supply reference voltage VGMA_UL corresponding to the first rising edge RE1 of the gamma polarity control signal GPCS, so as to generate multiple first gamma reference voltages according to the first power supply reference voltage VGMA_UH and the second power supply reference voltage VGMA_UL and output them to multiple first digital-to-analog conversion circuits. Under the control of the first gamma register CTL1, the multiple first digital-to-analog conversion circuits generate multiple first binding point voltages according to the multiple first gamma reference voltages and output them to multiple voltage followers. After the action of the multiple voltage followers, the multiple positive polarity gamma voltages are generated through the polarity voltage generation circuit to be output to the source driver module 204.

[0072] The multiple first output groups GP1 in the source driving module 204 correspond to the first rising edge RE1 of the gamma polarity control signal GPCS to select the first output group GP11 of the multiple first output groups GP1; the second digital-to-analog conversion circuit 2044 generates a plurality of positive polarity grayscale voltages according to the plurality of second data voltages and the positive polarity gamma voltage, and outputs them to the output buffer 2045 respectively, so that the output buffer 2045 generates a plurality of positive polarity data signals according to the plurality of positive polarity grayscale voltages, and outputs them to the first data line DL11, the third data line DL13, ..., the twenty-third data line DL123 among the multiple data lines DL through the odd channels CH1, CH3, CH5, CH7, CH9, CH11, CH13, CH15, CH17, CH19, CH21, and CH23 electrically connected to the first output group of the plurality of first output groups GP1.

[0073] The gamma voltage module 203 selects the second gamma register CTL2 corresponding to the first falling edge FE1 of the gamma polarity control signal GPCS; the gamma power supply unit 2031 receives the third power supply reference voltage VGMA_LH and the fourth power supply reference voltage VGMA_LL corresponding to the first falling edge FE1 of the gamma polarity control signal GPCS, so as to generate multiple second gamma reference voltages according to the third power supply reference voltage VGMA_LH and the fourth power supply reference voltage VGMA_LL and output them to multiple first digital-to-analog conversion circuits. Under the control of the second gamma register CTL2, the multiple first digital-to-analog conversion circuits generate multiple second binding point voltages according to the multiple second gamma reference voltages and output them to multiple voltage followers. After the action of the multiple voltage followers, the multiple negative polarity gamma voltages are generated through the polarity voltage generation circuit to be output to the source driver module 204.

[0074] The multiple second output groups GP2 in the source driving module 204 correspond to the first falling edge FE1 of the gamma polarity control signal GPCS to select the first output group GP21 of the multiple second output groups GP2; the second digital-to-analog conversion circuit 2044 generates a plurality of negative polarity grayscale voltages according to the multiple second data voltages and the negative polarity gamma voltage, and outputs them to the output buffer 2045 respectively, so that the output buffer 2045 generates a plurality of negative polarity data signals according to the plurality of negative polarity grayscale voltages, and outputs them to the second data line DL22, the fourth data line DL24, ..., the twenty-fourth data line DL224 of the plurality of data lines DL through the even channels CH2, CH4, CH6, CH8, CH10, CH12, CH14, CH16, CH18, CH20, CH22, and CH24 electrically connected correspondingly to the first output group GP21 of the multiple second output groups GP2.

[0075] Afterwards, the multiple first output groups GP1 in the source driving module 204 select the second output group GP12 of the multiple first output groups GP1 corresponding to the second rising edge RE2 of the gamma polarity control signal GPCS, and so on, the source driving module 204 selects the remaining output groups.

[0076] Optionally, the gamma voltage module and the source driving module may be electrically connected to the display panel 201 via a chip-on-film or the like. Optionally, the gamma voltage module may be integrated into a driving chip.

[0077] The present application can control the gamma voltage module 203 to output positive polarity gamma voltage and negative polarity gamma voltage in a time-sharing manner through the gamma polarity control signal GPCS, which is beneficial to improving the problem that the gamma voltage module 203 needs to set up two groups of voltage regulation modules and voltage followers to achieve positive and negative polarity gamma voltage output, and is beneficial to reducing the layout space occupied by the gamma voltage module 203, and can also reduce the routing complexity, reduce the size of the driver chip, and reduce costs.

[0078] like Figure 7 is a flow chart of a method for driving a display device provided by an embodiment of the present invention. The present invention also provides a method for driving a display device, which is used to drive any of the above-mentioned display devices, comprising:

[0079] Selecting the corresponding output group according to the gamma polarity control signal GPCS, and generating a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages;

[0080] A plurality of positive polarity data signals or a plurality of negative polarity data signals are correspondingly generated according to the clock control signal CK, the data latch control signal TP and a plurality of the positive polarity gamma voltages or a plurality of the negative polarity gamma voltages, so as to output a plurality of the positive polarity data signals or a plurality of the negative polarity data signals through the selected output group.

[0081] Optionally, the control module 202 generates the gamma polarity control signal GPCS to control the source driver module 204 to select the corresponding output group, and controls the gamma voltage module 203 to generate a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages to output to the source driver module 204 .

[0082] The source driver module 204 receives the clock control signal CK generated by the control module 202, the data latch control signal TP and the multiple positive polarity gamma voltages or the multiple negative polarity gamma voltages generated by the gamma voltage module 203, and correspondingly generates the multiple positive polarity data signals or the multiple negative polarity data signals, so as to output the multiple positive polarity data signals or the multiple negative polarity data signals to the corresponding data lines DL through the selected output group.

[0083] The step of selecting the corresponding output group according to the gamma polarity control signal GPCS and generating a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages includes: selecting a corresponding output group according to the rising edge of the gamma polarity control signal GPCS jumping from the first level state to the second level state, and generating a plurality of positive polarity gamma voltages; selecting a corresponding output group according to the falling edge of the gamma polarity control signal GPCS jumping from the second level state to the first level state, and generating a plurality of negative polarity gamma voltages.

[0084] Accordingly, in the step where the control module 202 generates the gamma polarity control signal GPCS to control the source driver module 204 to select the corresponding output group, and controls the gamma voltage module 203 to generate a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages to output to the source driver module 204, the steps include:

[0085] The control module 202 generates the gamma polarity control signal GPCS having a first level state and a second level state;

[0086] At the rising edge RE when the gamma polarity control signal GPCS changes from the first level state to the second level state, the source driver module 204 is controlled to select a corresponding output group, and the gamma voltage module 203 is controlled to generate a plurality of positive polarity gamma voltages to be output to the source driver module 204;

[0087] At the falling edge FE when the gamma polarity control signal GPCS changes from the second level state to the first level state, the source driver module 204 is controlled to select a corresponding output group, and the gamma voltage module 203 is controlled to generate a plurality of negative polarity gamma voltages to be output to the source driver module 204 .

[0088] Accordingly, the source driver module 204 receives the clock control signal CK generated by the control module 202, the data latch control signal TP, and the multiple positive polarity gamma voltages generated by the gamma voltage module 203, and correspondingly generates multiple positive polarity data signals to be output to the corresponding data lines DL at the rising edge RE. The source driver module 204 receives the clock control signal CK generated by the control module 202, the data latch control signal TP, and the multiple negative polarity gamma voltages generated by the gamma voltage module 203, and correspondingly generates multiple negative polarity data signals to be output to the corresponding data lines DL at the falling edge FE.

[0089] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A display device, characterized in that: include: A display panel including a plurality of data lines; A control module configured to generate a gamma polarity control signal, a clock control signal, and a data latch control signal; a gamma voltage module, electrically connected to the control module, and configured to generate a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages according to the gamma polarity control signal; A source driving module is electrically connected to the control module, the gamma voltage module and the plurality of data lines, the source driving module includes a plurality of output groups, each of the output groups is electrically connected to the corresponding data lines through a plurality of output channels of the source driving module; wherein the source driving module is configured to generate a plurality of positive polarity data signals and a plurality of negative polarity data signals according to the clock control signal, the data latch control signal, a plurality of the positive polarity gamma voltages and a plurality of negative polarity gamma voltages, and select the corresponding output group according to the gamma polarity control signal, and output the plurality of positive polarity data signals or the plurality of negative polarity data signals to the corresponding data lines.

2. The display device according to claim 1, characterized in that The gamma polarity control signal has a first level state and a second level state; Among them, the gamma voltage module is configured to generate a plurality of positive polarity gamma voltages according to the rising edge of the gamma polarity control signal jumping from the first level state to the second level state; and to generate a plurality of negative polarity gamma voltages according to the falling edge of the gamma polarity control signal jumping from the second level state to the first level state.

3. The display device according to claim 2, characterized in that: The gamma voltage module comprises: a gamma power supply unit, electrically connected to the control module, configured to generate a plurality of first gamma reference voltages according to the rising edge, the received first power supply reference voltage and the second power supply reference voltage, and to generate a plurality of second gamma reference voltages according to the falling edge, the received third power supply reference voltage and the fourth power supply reference voltage; a voltage generating unit, electrically connected to the gamma power supply unit; a first gamma register, electrically connected to the control module and the voltage generating unit, and configured to control the voltage generating unit to generate a plurality of positive polarity gamma voltages according to a plurality of the first gamma reference voltages according to the rising edge; The second gamma register is electrically connected to the control module and the voltage generating unit, and is configured to control the voltage generating unit to generate a plurality of negative polarity gamma voltages according to a plurality of the second gamma reference voltages according to the falling edge.

4. The display device according to claim 3, characterized in that: The gamma power supply unit comprises: a first operational amplifier, wherein a non-inverting input terminal of the first operational amplifier is configured to receive the first power supply reference voltage or the third power supply reference voltage, and an inverting input terminal of the first operational amplifier is electrically connected to an output terminal of the first operational amplifier; a second operational amplifier, wherein a non-inverting input terminal of the second operational amplifier is configured to receive the second power supply reference voltage or the fourth power supply reference voltage, and an inverting input terminal of the second operational amplifier is electrically connected to an output terminal of the second operational amplifier; and A plurality of first resistors are connected in series between the output terminal of the first operational amplifier and the output terminal of the second operational amplifier.

5. The display device according to claim 3, characterized in that: The voltage generating unit comprises: a plurality of first digital-to-analog conversion circuits, electrically connected to the first gamma register, the second gamma register and the gamma power supply unit, and configured to generate a plurality of first binding point voltages according to a plurality of first gamma reference voltages under the control of the first gamma register, and to generate a plurality of second binding point voltages according to a plurality of second gamma reference voltages under the control of the second gamma register; a plurality of voltage followers electrically connected to the plurality of digital-to-analog conversion circuits; and The polarity voltage generating circuit is electrically connected to the plurality of voltage followers and is configured to generate a plurality of the positive polarity gamma voltages according to a plurality of the first binding point voltages and to generate a plurality of the negative polarity gamma voltages according to a plurality of the second binding point voltages.

6. The display device according to claim 2, characterized in that: The plurality of data lines include a plurality of first data lines and a plurality of second data lines, and the first data lines and the second data lines are arranged alternately; The multiple output groups include multiple first output groups and multiple second output groups; each of the first output groups is electrically connected to the corresponding first data line through an odd-numbered output channel of the multiple output channels, and each of the second output groups is electrically connected to the corresponding second data line through an even-numbered output channel of the multiple output channels.

7. The display device according to claim 6, characterized in that: The gamma polarity control signal has multiple transitions between the first level state and the second level state; The source driving module is configured to select the corresponding first output group according to different rising edges to output the positive polarity data signal to the corresponding first data line; And, the corresponding second output group is selected according to the different falling edges to output the negative polarity data signal to the corresponding second data line.

8. The display device according to claim 1, characterized in that: The source driver module comprises: a shift register, electrically connected to the control module, and configured to generate a sampling signal according to the clock control signal; a latch, electrically connected to the control module and the shift register, configured to generate a plurality of first data voltages according to the sampling signal and the received image signal, and to latch or release the plurality of first data voltages according to the data latch control signal; a level conversion circuit, electrically connected to the latch, and configured to generate a plurality of second data voltages according to a plurality of the first data voltages; a second digital-to-analog conversion circuit, electrically connected to the level conversion circuit and the gamma voltage module, and configured to generate a plurality of positive polarity grayscale voltages according to a plurality of the second data voltages and the positive polarity gamma voltages; and to generate a plurality of negative polarity grayscale voltages according to a plurality of the second data voltages and the plurality of the negative polarity gamma voltages; and An output buffer is electrically connected to the second digital-to-analog conversion circuit, and includes a plurality of the output groups. The output buffer is configured to generate a plurality of the positive polarity data signals according to a plurality of the positive polarity grayscale voltages, and to generate a plurality of the negative polarity data signals according to a plurality of the negative polarity grayscale voltages.

9. A method for driving a display device, characterized in that: Used to drive the display device according to any one of claims 1 to 8, comprising: Selecting the corresponding output group according to the gamma polarity control signal, and generating a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages; A plurality of positive polarity data signals or a plurality of negative polarity data signals are correspondingly generated according to the clock control signal, the data latch control signal and a plurality of the positive polarity gamma voltages or a plurality of the negative polarity gamma voltages, so as to output a plurality of the positive polarity data signals or a plurality of the negative polarity data signals through the selected output group.

10. The method for driving a display device according to claim 9, characterized in that: The step of selecting the corresponding output group according to the gamma polarity control signal and generating a plurality of positive polarity gamma voltages or a plurality of negative polarity gamma voltages includes: Selecting a corresponding output group according to a rising edge of the gamma polarity control signal changing from a first level state to a second level state, and generating a plurality of positive polarity gamma voltages; According to the falling edge of the gamma polarity control signal changing from the second level state to the first level state, a corresponding output group is selected, and a plurality of negative polarity gamma voltages are generated.

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