CN116469354A - Gamma circuit, driving circuit of display panel and display panel - Google Patents

Abstract

The embodiment of the application discloses a gamma circuit, a display panel's drive circuit and display panel, belongs to and shows technical field. The gamma circuit includes: the input voltage regulating module is used for generating reference voltage after performing voltage stabilization treatment on external input voltage and decomposing the reference voltage into a plurality of pieces of reference voltage with preset quantity; the gamma voltage adjusting module is connected with the input voltage adjusting module and is used for generating a first gamma voltage set and a second gamma voltage set according to an external control command and each reference voltage, wherein the precision of the second gamma voltage set is higher than that of the first gamma voltage set. According to the embodiment of the application, the accuracy of the partial gamma reference voltage output by the gamma circuit is improved, so that the brightness change perceived by human eyes can not be perceived by human eyes any more when the display screen switches the refresh rate in the related technology, and the problem of picture flickering is solved.

Description

Gamma circuit, driving circuit of display panel and display panel

Technical Field

The embodiment of the application relates to the technical field of display, in particular to a gamma circuit, a driving circuit of a display panel and the display panel.

Background

Currently, gamma (Gamma) circuit debugging is to adjust a Gamma resistor network on a TCON board (logic board, screen driving board, central control board) according to actual needs to obtain a plurality of Gamma reference voltages to be output to a data driving circuit, so that Gamma curves meet requirements, and the precision of each Gamma reference voltage is uniform.

Under the condition that the display screen needs to be switched among different refresh rates, the magnitude of each gamma reference voltage can be changed along with the adjustment of the TCON plate, and as the accuracy of each gamma reference voltage is uniform and the gray levels corresponding to different gamma voltages are different, the change of the brightness of a picture caused by the change of part of gamma reference voltages is easily perceived by human eyes, and the problem of picture flickering of the display screen is particularly solved.

Disclosure of Invention

The embodiment of the application mainly aims to provide a gamma circuit, a display panel driving circuit and a display panel, and aims to solve the technical problem that a display screen flashes when being switched between different refresh rates.

To achieve the above object, an embodiment of the present application provides a gamma circuit, including:

the input voltage adjusting module is used for generating reference voltage after performing voltage stabilization processing on external input voltage and decomposing the reference voltage into a plurality of preset reference voltages;

the gamma voltage adjusting module is connected with the input voltage adjusting module and is used for generating a first gamma voltage set and a second gamma voltage set according to external control instructions and the reference voltages, wherein the precision of the second gamma voltage set is higher than that of the first gamma voltage set.

Optionally, the first gamma voltage set includes gamma voltages of 10 corresponding boundary gray scale voltages, and the second gamma voltage set includes gamma voltages of 4 corresponding intermediate gray scale voltages, wherein a corresponding brightness change when the boundary gray scale voltages are changed is not perceived by human eyes, and a corresponding brightness change when the intermediate gray scale voltages are changed is perceived by human eyes.

Optionally, the first gamma voltage set has an accuracy of 10 bits, and the second gamma voltage set has an accuracy of 12 bits.

Optionally, the gamma voltage adjustment module includes:

the input end of the first digital-to-analog conversion unit is connected with the input voltage adjusting module, and the first digital-to-analog conversion unit is used for generating a first gamma voltage set and a second gamma voltage set according to an external control instruction and each reference voltage and outputting the first gamma voltage set to the data driving circuit;

the second digital-to-analog conversion unit is connected with the output end of the first digital-to-analog conversion unit, and is used for outputting the second gamma voltage set to the data driving circuit after secondary adjustment.

Optionally, the gamma voltage adjustment module further comprises:

the voltage dividing resistor string is arranged between the output end of the first digital-to-analog conversion unit and the input end of the second digital-to-analog conversion unit, and is used for carrying out voltage dividing processing on the second gamma voltage set and transmitting each gamma voltage after the voltage dividing processing to the second digital-to-analog conversion unit.

Optionally, the first digital-to-analog conversion unit is a DAC 10 bit-to-1024 decoder.

Optionally, the second digital-to-analog conversion unit is a DAC 2bit to 4 decoder.

Optionally, the input voltage adjustment module includes:

the voltage stabilizing unit is used for generating a reference voltage after carrying out voltage stabilizing treatment on the external input voltage;

the voltage division unit is connected with the voltage stabilizing unit and is used for decomposing the reference voltage into a plurality of reference voltages with preset quantity.

In addition, to achieve the above object, an embodiment of the present application further provides a driving circuit of a display panel, including: a power supply circuit, a timing control circuit, a data driving circuit, and a gamma circuit as described above;

the power supply circuit is connected with the time sequence control circuit, the data driving circuit and the gamma circuit and is used for supplying power to the time sequence control circuit, the data driving circuit and the gamma circuit;

the time sequence control circuit is connected with the gamma circuit and the data driving circuit, and is used for sending a control instruction to the gamma circuit so that the gamma circuit outputs gamma reference voltage to the data driving circuit, and is also used for sending display data to the data driving circuit;

the data driving circuit is connected with the gamma circuit and a display area of the display panel, and is used for outputting gray scale voltages to the display area based on the gamma reference voltage and the display data.

In addition, in order to achieve the above object, the embodiments of the present application further provide a display panel, where the display panel includes a panel body and the driving circuit of the display panel as described above, and the driving circuit of the display panel is disposed in a non-display area of the panel body.

The embodiment of the application provides a gamma circuit, a driving circuit of a display panel and the display panel, wherein the gamma circuit comprises: the input voltage regulating module is used for generating reference voltage after performing voltage stabilization treatment on external input voltage and decomposing the reference voltage into a plurality of pieces of reference voltage with preset quantity; the gamma voltage adjusting module is connected with the input voltage adjusting module and is used for generating a first gamma voltage set and a second gamma voltage set according to an external control command and each reference voltage, wherein the precision of the second gamma voltage set is higher than that of the first gamma voltage set. According to the embodiment of the application, the accuracy of the partial gamma reference voltage output by the gamma circuit is improved, so that the brightness change perceived by human eyes can not be perceived by human eyes any more when the display screen switches the refresh rate in the related technology, and the problem of picture flickering is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only a part of the embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a gamma circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another gamma circuit according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a gamma circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a driving circuit of a display panel according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present application.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Input voltage regulating module	20	Gamma voltage regulating module
101	Voltage stabilizing unit	201	A first digital-to-analog conversion unit
				102	Voltage dividing unit	202	A second digital-to-analog conversion unit
Vref	Reference voltage	203	Voltage dividing resistor string
				VAA	External input voltage	OUT1	First gamma voltage set
OUT2	Second gamma voltage set	I2C	Two-wire serial bus
				01	Power supply circuit	02	Time sequence control circuit
03	Data driving circuit	04	Gamma circuit
				05	Display surfaceDisplay area of panel	A	Panel body
B	Non-display area of panel body

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the embodiments of the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the embodiments of the present application with unnecessary detail.

It should be noted that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different from that in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

It should also be appreciated that references to "one embodiment" or "some embodiments" or the like described in the specification of embodiments of the present application mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

Freesync is a Display frequency conversion technology, and is a technology for implementing a dynamic refresh rate by AMD (Advanced Micro Devices, inc., ultrawile semiconductor corporation) using industry standards such as Display Port (DP, a Display Port), adaptive synchronization, and the like. The dynamic refresh rate minimizes input delay and reduces or completely eliminates the problems of churning and tearing during game play and video play by synchronizing the refresh rate of a compatible display with the frame rate of a user's graphics card.

One frame of the display screen is divided into an Active area of display time and a Blank area of pause time before entering the next frame, and assuming that an FHD (48 Hz-240 Hz) display screen is taken as an example, the resolution is 1920 x 1080, the 1080 lines are required to be scanned and charged in total, then 45 lines are stopped, the 1080 line charging time is the Active area, the 45 line charging time is the Blank area, and the Fresync is to change the refresh rate by changing the line number of the charging time of the Blank area. For example, in the case where the refresh rate is 240Hz, the number of lines per frame, i.e., V Total, is 1125 lines, and if the Blank area is increased by 1125 lines, the number of lines per frame, i.e., V Total, becomes 2250 lines, and since the charging time per line is the same, the refresh rate is changed from 240Hz to 120 Hz.

The LCD (Liquid Crystal Display ) maintains brightness by maintaining a voltage difference across the liquid crystal after scanning and charging, but since the charged electricity is slowly lost, for example, the time length of one frame at two refresh rates of 240Hz and 48Hz is 5 times different, the leakage time length corresponding to the Blank area of the two refresh rates is also greatly different, so that a bright-dark change perceived by naked eyes occurs if the fresync is switched between refresh rates with great difference of the refresh rates.

In view of the above problems, a method for performing brightness compensation by trimming gray scale voltages of gray scales at different refresh rates is currently proposed in the related art, that is, TCON sends a control command through I2C (Inter-Integrated Circuit, two-wire serial bus) to make GM (gamma) generate 14 (e.g. 10 or 18) GM voltages to Driver (Data driving circuit), and Driver automatically divides the voltages through resistor strings to generate 256 x 2 (positive and negative gray scales) gray scale voltages, and then decides positive and negative based on POL (line inversion signal) given by TCON, and the gray scale DAC determined by Data is converted into Data voltage to be displayed in plane to complete brightness compensation.

Based on the gamma circuit, the brightness is obviously improved after GM compensation is adjusted under different refresh rates, but the brightness still has certain fluctuation and can be perceived by human eyes, because the brightness difference between the refresh rate at 144Hz and 48Hz is 4nits, but the GM still has 1nits brightness change when the GM is displayed with the minimum Step adjustment voltage, namely, at most 4 steps can be compensated, the compensation result still has certain fluctuation and is not smooth enough, and the minimum Step of the GM needs to be finer.

Based on this, the embodiment of the application provides a gamma circuit, a driving circuit of a display panel and a display panel, and by finer minimum Step of GM, the accuracy of partial gamma reference voltage output by the gamma circuit is improved, so that the brightness change which can be perceived by human eyes can not be perceived by human eyes any more when the display screen switches the refresh rate in the related technology, and further the problem of picture flickering is solved.

The gamma circuit, the driving circuit of the display panel and the display panel provided in the embodiments of the present application are specifically described through the following embodiments, and the gamma circuit in the embodiments of the present application is described first.

An embodiment of the present application provides a gamma circuit, referring to fig. 1, and fig. 1 is a schematic structural diagram of the gamma circuit according to an embodiment of the present application.

The input voltage adjusting module 10 is configured to perform voltage stabilizing processing on an external input voltage VAA, generate a reference voltage Vref, and decompose the reference voltage Vref into a plurality of pieces of reference voltages with a preset number;

the gamma voltage adjusting module 20 is connected with the input voltage adjusting module 10, and the gamma voltage adjusting module 20 is configured to generate a first gamma voltage set OUT1 and a second gamma voltage set OUT2 according to an external control command and each reference voltage, wherein the accuracy of the second gamma voltage set OUT2 is higher than that of the first gamma voltage set OUT 1.

It should be noted that the gamma circuit provided in this embodiment may be applied to a driving circuit of a display panel, where the external input voltage VAA is provided by a power supply circuit in the driving circuit, and the external control command is sent by a timing control circuit TCON in the driving circuit through I2C.

In some possible embodiments, the first set of gamma voltages has a precision of 10 bits and the second set of gamma voltages has a precision of 12 bits.

As an example, in case the precision of the first gamma voltage set OUT1 is 8 bits, the precision of the second gamma voltage set OUT2 may be 10 bits; in case that the precision of the first gamma voltage set OUT1 is 10 bits, the precision of the second gamma voltage set OUT2 may be 11 bits or 12 bits.

In some possible embodiments, the first gamma voltage set OUT1 includes 10 groups of gamma voltages corresponding to boundary gray scale voltages, and the second gamma voltage set OUT2 includes 4 groups of gamma voltages corresponding to intermediate gray scale voltages, wherein the corresponding brightness change when the boundary gray scale voltages are changed is not perceived by human eyes, and the corresponding brightness change when the intermediate gray scale voltages are changed is perceived by human eyes.

As an example, the gamma circuit in this embodiment may generate 14 sets of gamma reference voltages GM1, GM2, GM3, respectively, GM14, GM1,2,3,4,5,6,7,8,9,10,11,12,13,14 corresponding to the gray scales 255, 254, 223, 127, 31,1,0,0, -1, -31, -127, -223, -254, -255, wherein GM1,2,3,6,7,8,9,12,13,14 is the first gamma voltage set OUT1, GM4,5,10,11 belonging to the boundary gray scale voltages 255, 254, 223,1,0,0, -1, -223, -254, -255, and the second gamma voltage set OUT2 corresponding to the intermediate gray scale voltages 127, 31, -31, -127, respectively.

As an example, it is known from the above examples that the corresponding gray scale is either too high or too low for GM1,2,3,6,7,8,9,12,13,14, and the 10bit division is sufficient, and the corresponding brightness change is not perceived by human eyes although there is a certain fluctuation in the gamma voltage compensation, but the corresponding gray scale is middle-low gray scale for GM4,5,10,11, and thus the fluctuation is perceived by human eyes.

In some possible embodiments, the gamma voltage adjustment module 20 includes:

the input end of the first digital-to-analog conversion unit 201 is connected with the input voltage adjusting module 10, and the first digital-to-analog conversion unit 201 is configured to generate a first gamma voltage set OUT1 and a gamma voltage set to be processed according to an external control instruction and each reference voltage, and output the first gamma voltage set to a data driving circuit;

the second digital-to-analog conversion unit 202, the second digital-to-analog conversion unit 202 is connected to the output end of the first digital-to-analog conversion unit 201, and the second digital-to-analog conversion unit 202 is configured to obtain the second gamma voltage set OUT2 after the gamma voltage set to be processed is secondarily adjusted, and output the second gamma voltage set OUT2 to the data driving circuit.

In some possible embodiments, the gamma voltage adjustment module 20 further includes:

the voltage dividing resistor string 203 is disposed between the output end of the first digital-to-analog conversion unit 201 and the input end of the second digital-to-analog conversion unit 202, and the voltage dividing resistor string 203 is configured to perform voltage dividing processing on the gamma voltage set to be processed and transmit each gamma voltage after the voltage dividing processing to the second digital-to-analog conversion unit.

It should be noted that, in this embodiment, the gamma circuit generates Vref after stabilizing the VAA voltage, then equally divides Vref into 10 bits (1 part may be regarded as 1 Step) that are 1024 parts of reference voltage, TCON sets GM voltages of different GM by transmitting 2-system commands through I2C, GM outputs after performing DAC (Digital-to-Analog Converter) according to the commands, for GM1,2,3,6,7,8,9,12,13,14, since the corresponding brightness change will not be perceived by human eyes, 10 bits are kept unchanged, but GM4,5,10,11 needs to be divided by 12 bits (13 bits may be, more is not necessary), the high-order 10 bits in the 12 bits are firstly processed identically with GM1,2,3,6,7,8,9,12,13,14 in the first Digital-Analog conversion unit 201, the processed result is transmitted to the second Digital-Analog conversion unit 202 through the voltage dividing resistor string 203 for further 2 bits to perform finer division, and finally, GM4,5,10,11 is only need to be divided by 2 bits, and thus the related technology is simplified, and the most improved precision is achieved.

As an example, since the LCD display screen display brightness is composed of positive and negative gray levels, we can further fine tune brightness, positive and negative are separately controlled, and GM4 and GM11 correspond to positive 127 gray and negative 127 gray respectively, when one of GM4 or GM11 is added with a Step, macroscopic view is added with 1/2Step, when GM4 or GM11 is added with a Step, macroscopic view is added with 1Step, so 0,0.5,1 brightness is adjusted.

As an example, the first DAC unit 201 is a DAC 10bit to 1024 decoder.

As an example, the second digital-to-analog conversion unit 202 is a DAC 2bit to 4 decoder.

In some possible embodiments, the input voltage adjustment module 10 includes:

a voltage stabilizing unit 101, where the voltage stabilizing unit 101 is configured to perform voltage stabilizing processing on an external input voltage VAA to generate a reference voltage Vref;

the voltage division unit 102, the voltage division unit 102 is connected with the voltage stabilizing unit 101, and the voltage division unit 102 is used for decomposing the reference voltage Vref into a plurality of reference voltages with preset quantity.

As an example, in the present embodiment, the voltage stabilizing unit 101 may be a voltage regulator.

As an example, in the present embodiment, the voltage dividing unit 202 may be a voltage dividing resistor string whose resistance value is set as needed.

Furthermore, as an alternative, based on the gamma circuit provided in the above embodiment, if the gamma circuit still works with 10 bits (i.e. the second digital-to-analog conversion unit 202 and the voltage dividing resistor string 203 in the above gamma circuit are removed), we can realize the effect that the accuracy of the partial gamma reference voltage reaches 11 bits and 12 bits through the extension circuit.

Referring to fig. 2, fig. 2 is a schematic diagram of another gamma circuit provided in this embodiment, in fig. 2, GM4 and 5,10,11 are formed by dividing voltages of two GM outputs by resistors with equal resistance values, so that GM chips with 18 GM outputs are required for outputting 14 gamma reference voltages. Taking GM4 as an example, since GM internal registers are outputs controlled with 10 bits (1024 parts), one part is a Step, if R1 is equal to R2, when one of GM4 or GM11 is added by half Step, macroscopically by 1/4Step, when two of GM4 or GM11 are added by half Step, macroscopically by 1/2Step, when one of GM4 or GM11 is added by one Step, the other is added by half Step, macroscopically by 3/4Step, when two of GM4 or GM11 are added by one Step, macroscopically by 1Step, therefore, it is 0,0.25,0.5,1 brightness adjustment, 1bit accuracy; and the method is equivalent to 11bit division for TCON control selection, and the GM voltage is finely adjusted.

Referring to fig. 3 in the same way, fig. 3 is a schematic diagram of another gamma circuit according to the present embodiment.

As an example, R1 can be replaced by 3Ω, R2, R3 can be replaced by a 6Ω resistor, a simplified circuit, 3Ω/6Ω is just an example, and the resistance can be adjusted in a certain range, when one of GM4 or GM11 is added by half Step, macroscopic is 1/6 (one is added by 1/3), 2/6 (two is added by 1/3), 3/6 (one is added by 1), 4/6 (two is added by 2/3), 5/6 (one is added by 2/3, one is added by 1), 6/6 (two is added by 1), so 0,0.17,0.33,0.5,0.67,0.83,1 brightness is adjusted, and the precision more than 10 bits is higher than 1bit but less than 2bit.

As an example, R1 is replaced with 2Ω, R2, R3 may be replaced with an 8Ω resistor, R10 with 2Ω, R11, R12 with an 8Ω resistor, macroscopic may be 1/8 (one plus 1/4), 2/8 (two plus 1/4), 3/8 (one plus 1, one minus 1/4), 4/8 (one plus 1), 5/8 (one plus 1/4, one plus 1), 6/8 (two plus 3/4), 7/8 (one plus 1/4, one plus 3/4), 1 (two plus 1), so is 0,0.125,0.25,0.375,0.5,0.625,0.75,0.875,1 brightness; and the method is equivalent to 12bit division for TCON control selection, and fine adjustment of GM voltage is realized.

It should be noted that, in fig. 2 and 3, besides the gamma circuit GM, a Power supply circuit Power for providing an external input voltage VAA to the GM and a timing control circuit TCON for sending an external control command to the GM through I2C are also shown, V1 to V18 respectively represent 18 paths of voltages output by the GM, R1 to R12 are resistors with resistance values adjustable according to actual requirements, and GM1 to GM14 are gamma reference voltages finally output to the data driving circuit.

The embodiment of the application provides a gamma circuit, through at the inside digital-to-analog conversion unit that increases of gamma circuit, or the newly-increased extension circuit of output at gamma circuit, can both finer the minimum Step of gamma circuit, improved the precision of the partial gamma reference voltage of gamma circuit output for the luminance change that can be perceived by the human eye when the display screen switches the refresh rate can no longer be perceived by the human eye in the correlation technique, and then solved picture scintillation problem.

It should be noted that GM refinement adjustment implemented based on the gamma circuit provided in this embodiment is not only beneficial to implementing brightness compensation during switching between different refresh rates based on gamma voltage compensation. For example, when the display screen is produced, for a part of high-specification products, auto P-GM adjustment is performed on each display screen through an automatic instrument, namely, each display screen has GM setting which is most suitable for the display screen, so that Flicker is optimized, and Auto P-GM adjustment of the optimum value of the Flicker is more accurate after GM refinement. For another example, the brightness and contrast of the whole display screen can be adjusted, for example, when the mobile phone is used, the mobile phone can be automated or the user is required to manually adjust the display brightness, for example, the mobile phone is adjusted from 100% to 50%, the brightness change in the adjusting process is required to be as fine and continuous as possible, the backlight brightness can be adjusted, the display data can be adjusted, but if the brightness is not fine enough, the GM precision can be adjusted. When the gray scale is adjusted to 50% by 100%, the same number of gray scale numbers as 100% are still needed when the gray scale is adjusted to 50%, the adjustment of the display data is not feasible, only the adjustment of the backlight brightness or the GM voltage is performed, the adjustment of the backlight brightness is the integral compression of all gray scales, but the gray scale brightness curve is required to meet the GM2.2 brightness curve perceived by human eyes, the adjustment of the backlight brightness is followed by further fine adjustment of the display data and the GM voltage to enable the display data and the GM voltage to fit the GM2.2 brightness curve, and the fitting degree can be adjusted to be higher when the GM precision is higher.

In addition, an embodiment of the present application further provides a driving circuit of a display panel, referring to fig. 4, fig. 4 is a schematic structural diagram of the driving circuit of the display panel according to an embodiment of the present application, where the driving circuit of the display panel includes: a power supply circuit 01, a timing control circuit 02, a data driving circuit 03, and a gamma circuit 04 provided in the above-described embodiment;

the power supply circuit 01 is connected with the time sequence control circuit 02, the data driving circuit 03 and the gamma circuit 04, and the power supply circuit 01 is used for supplying power to the time sequence control circuit 02, the data driving circuit 03 and the gamma circuit 04;

the timing control circuit 02 is connected to the gamma circuit 04 and the data driving circuit 03, the timing control circuit 02 is configured to send a control command to the gamma circuit 04 to enable the gamma circuit 04 to output a gamma reference voltage to the data driving circuit 03, and the timing control circuit 02 is also configured to send display data to the data driving circuit 03;

the data driving circuit 03 is connected to the gamma circuit 04 and the display area 05 of the display panel, and the data driving circuit 03 is configured to output gray scale voltages to the display area 05 based on the gamma reference voltages and the display data.

It is understood that the external input voltage VAA in the above embodiment may be provided by the power supply circuit 01 in the present embodiment, and the external control instruction in the above embodiment may be a control instruction that the timing control circuit 02 in the present embodiment sends to the gamma circuit 04 through I2C.

The driving circuit of the display panel provided in this embodiment belongs to the same inventive concept as the gamma circuit provided in the above embodiment, and technical details not described in detail in this embodiment can be seen in any of the above embodiments, and this embodiment has the same advantages as the gamma circuit.

In addition, the embodiment of the present application further provides a display panel, in which the driving circuit of the display panel provided in the foregoing embodiment is integrated, referring to fig. 5, fig. 5 is a schematic structural diagram of the display panel provided in an embodiment of the present application, as shown in fig. 5, where the display panel may include a panel body a and the driving circuit of the display panel provided in the foregoing embodiment, and the driving circuit of the display panel is disposed in a non-display area B of the panel body a.

As an example, the display panel In the present embodiment may be a TN (twisted nematic) display panel, an IPS (In-Plane Switching) display panel, a VA (Vertical Alignment) display panel, an MVA (Multi-Domain Vertical Alignment, multi-quadrant vertically aligned) display panel, or of course, other types of display panels, such as an OLED (organic light-Emitting Diode) display panel.

As an example, the display panel may be applied to a display device, which may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc.

It will be appreciated by those skilled in the art that the structure shown in fig. 5 is not limiting of the display device and may include more or fewer components than shown, or may combine certain components, or may be arranged in different components.

The display panel according to the present embodiment and the gamma circuit according to the above embodiment belong to the same inventive concept, and technical details not described in detail in the present embodiment can be seen in any of the above embodiments, and the present embodiment has the same advantages as the gamma circuit.

It should be noted that the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on that the skilled person can realize that when the combination of the technical solutions contradicts or cannot be realized, the person should consider that the combination of the technical solutions does not exist, and is not within the scope of protection claimed in the present application.

The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.

Claims (10)

1. A gamma circuit, the gamma circuit comprising:

the input voltage adjusting module is used for generating reference voltage after performing voltage stabilization processing on external input voltage and decomposing the reference voltage into a plurality of pieces of reference voltage with preset quantity;

the gamma voltage adjusting module is connected with the input voltage adjusting module and is used for generating a first gamma voltage set and a second gamma voltage set according to external control instructions and the reference voltages, wherein the precision of the second gamma voltage set is higher than that of the first gamma voltage set.

2. The gamma circuit of claim 1, wherein the first set of gamma voltages comprises 10 sets of gamma voltages corresponding to boundary gray scale voltages, and the second set of gamma voltages comprises 4 sets of gamma voltages corresponding to intermediate gray scale voltages, wherein a corresponding change in brightness when the boundary gray scale voltages change is not perceived by a human eye, and wherein a corresponding change in brightness when the intermediate gray scale voltages change is perceived by a human eye.

3. The gamma circuit of claim 1, wherein the first set of gamma voltages has a precision of 10 bits and the second set of gamma voltages has a precision of 12 bits.

4. The gamma circuit of claim 1, wherein the gamma voltage adjustment module comprises:

the input end of the first digital-to-analog conversion unit is connected with the input voltage adjusting module, and the first digital-to-analog conversion unit is used for generating a first gamma voltage set and a gamma voltage set to be processed according to an external control instruction and each reference voltage and outputting the first gamma voltage set to a data driving circuit;

the second digital-to-analog conversion unit is connected with the output end of the first digital-to-analog conversion unit, and is used for obtaining a second gamma voltage set after the gamma voltage set to be processed is subjected to secondary adjustment, and outputting the second gamma voltage set to the data driving circuit.

5. The gamma circuit of claim 4, wherein the gamma voltage adjustment module further comprises:

the voltage dividing resistor string is arranged between the output end of the first digital-to-analog conversion unit and the input end of the second digital-to-analog conversion unit, and is used for carrying out voltage dividing treatment on the gamma voltage set to be treated and transmitting each gamma voltage after the voltage dividing treatment to the second digital-to-analog conversion unit.

6. The gamma circuit of claim 4, wherein the first digital-to-analog conversion unit is a DAC 10bit to 1024 decoder.

7. The gamma circuit of claim 4, wherein the second digital-to-analog conversion unit is a DAC 2bit to 4 decoder.

8. The gamma circuit of any one of claims 1 to 7, wherein the input voltage adjustment module comprises:

the voltage stabilizing unit is used for generating a reference voltage after carrying out voltage stabilizing treatment on the external input voltage;

the voltage division unit is connected with the voltage stabilizing unit and is used for decomposing the reference voltage into a plurality of pieces of reference voltages with preset quantity.

9. A driving circuit of a display panel, characterized in that the driving circuit of the display panel comprises: a power supply circuit, a timing control circuit, a data driving circuit, and the gamma circuit according to any one of claims 1 to 8;

the power supply circuit is connected with the time sequence control circuit, the data driving circuit and the gamma circuit and is used for supplying power to the time sequence control circuit, the data driving circuit and the gamma circuit;

the time sequence control circuit is connected with the gamma circuit and the data driving circuit, and is used for sending a control instruction to the gamma circuit so that the gamma circuit outputs gamma reference voltage to the data driving circuit, and is also used for sending display data to the data driving circuit;

the data driving circuit is connected with the gamma circuit and a display area of the display panel, and is used for outputting gray scale voltages to the display area based on the gamma reference voltage and the display data.

10. A display panel, characterized in that the display panel comprises a panel body and the driving circuit of the display panel according to claim 9, the driving circuit of the display panel being arranged in a non-display area of the panel body.