CN109559696B - Display module, gamma voltage adjusting method thereof and display device - Google Patents
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The invention discloses a display module, a gamma voltage regulating method thereof and a display device, wherein the display module comprises: the display panel is internally provided with a pixel array; the time schedule controller is configured to count the enabling signals of the charged sub-pixels in each row in the pixel array when the display module works, and output corresponding control signals according to the counted times; the gamma circuit is configured to generate a plurality of groups of gamma reference voltages according to corresponding control signals, and the voltage values of the gamma reference voltages are sequentially increased; and the source driver is configured to drive the sub-pixels of the corresponding row to work according to the corresponding gamma reference voltage. The invention improves the brightness uniformity of the area of the display panel far away from the source driver and the area near the source driver.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a display module, a gamma voltage adjusting method thereof and a display device.
Background
The statements herein merely provide background information related to the present application and may not necessarily constitute prior art.
In order to comply with the development of large-scale and high-resolution trend of lcd tvs, more and more lcd panels adopt a narrow-bezel design.
However, the source driver is generally disposed at a lower frame of the display panel, so that equal resistance can not be set between each data line and the source driver, that is, the data line near the source driver is shorter and has smaller resistance, and the data line far from the side edge is longer and has larger resistance, which results in uneven charging in the area far from the source driver and the area near the source driver.
Disclosure of Invention
The invention provides a display module, a gamma voltage adjusting method of the display module and a display device, and aims to improve the brightness uniformity of a region of a display panel far away from a source driver and a region of the display panel close to the source driver.
In order to achieve the above object, the present invention provides a display module, which includes:
the display panel is internally provided with a pixel array;
the time schedule controller is configured to count the enabling signals of the charged sub-pixels in each row in the pixel array when the display module works, and output corresponding control signals according to the counted times;
the gamma circuit is configured to generate a plurality of groups of gamma reference voltages according to the corresponding control signals, and the voltage values of the plurality of groups of gamma reference voltages are sequentially increased; and
and the source driver is configured to drive the sub-pixels of the corresponding row to work according to the corresponding gamma reference voltage.
Optionally, the timing controller includes a row counter and a control unit, the control unit is configured to output a first control signal when the display module operates, the row counter is configured to count enable signals of charged sub-pixels in each row of the access pixel array, and when the count number reaches a preset number, the control unit is triggered to output a second control signal.
Optionally, the gamma circuit is a programmable gamma chip, and the programmable gamma chip includes:
a first memory configured to output a first gamma reference voltage according to the first control signal, and a second memory configured to output a second gamma reference voltage according to the second control signal; the first gamma reference voltage is less than the second gamma reference voltage;
and the digital-to-analog converter comprises two input ends and an output end, the two input ends of the digital-to-analog converter are correspondingly connected with the first memory and the second memory one by one, the output end of the digital-to-analog converter is connected with the input end of the source driver, and the digital-to-analog converter is configured to perform digital-to-analog conversion on the digital first gamma reference voltage output by the first memory or the digital second gamma reference voltage output by the second memory and then output the digital first gamma reference voltage or the digital second gamma reference voltage to the source driver.
Optionally, the programmable gamma chip further includes a voltage follower, an input end of the voltage follower is connected to an output end of the digital-to-analog converter, and an output end of the voltage follower is connected to the source driver;
the voltage follower is configured to amplify and correct the current driving capability of the multiple groups of gamma reference voltages generated by the digital-to-analog converter.
Optionally, the source driver is disposed at one side of the display panel;
the display panel is provided with a first display area arranged close to the source driver and a second display area arranged far away from the source driver;
the pixel array comprises a plurality of rows of first sub-pixels arranged in the first display area and a plurality of rows of second sub-pixels arranged in the second display area.
Optionally, the source driver is specifically configured to drive a plurality of rows of first sub-pixels in the first display region to operate according to the first gamma reference voltage, and drive a plurality of rows of second sub-pixels in the first display region to operate according to the second gamma reference voltage.
Optionally, the display module further includes a gate driver and a plurality of scan lines, and a plurality of output ends of the gate driver are connected to the gates of the sub-pixels in each row of the pixel array in a one-to-one correspondence manner through the scan lines.
Optionally, the timing controller is specifically configured to output a first control signal when the display module operates, count enable signals obtained by charging each row of sub-pixels in the access pixel array, and output a second control signal when the count reaches a first preset number; and outputting a third control signal when the counting number reaches a second preset number.
The invention also provides a display device which comprises the display module.
The invention also provides a gamma voltage regulating method of the display module, and the display module comprises the following steps: the display device comprises a source driver, a display panel and a gamma circuit; wherein the gamma circuit includes a first gamma voltage output unit and a second gamma voltage output unit; a pixel array is arranged in the display panel; the display panel comprises a first display area and a second display area;
the gamma voltage regulating method of the display module comprises the following steps:
when the display module works, controlling a first gamma voltage output unit to output a first gamma voltage so that the source electrode driver drives first sub-pixels of a corresponding row in the first display area to work according to the first gamma voltage;
and counting the enable signals of charged sub-pixels of each row in the pixel array, and controlling the second gamma voltage output unit to output a second gamma voltage when the count reaches a preset number of times, so that the source driver drives the second sub-pixels of the corresponding rows in the second display area to work according to the second gamma voltage.
The display module is provided with the time schedule controller, so that when the display module works, the enabling signals of all rows of sub-pixels in the pixel array after being charged are counted, and a plurality of control signals are output according to the counted times; the control gamma circuit generates a plurality of groups of gamma reference voltages according to the corresponding control signals, and the voltage values of the gamma reference voltages are sequentially increased; therefore, the source driver drives the sub-pixels corresponding to the pixel array in the display panel to work according to the corresponding gamma reference voltage. The invention solves the problem of uneven brightness caused by uneven wiring resistance of the data lines in the area of the display panel far away from the source driver and the area close to the source driver.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a display module according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a display module according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a display module according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the gamma circuit of FIG. 1;
FIG. 5 is a voltage-luminance V-T curve of the display module of the present invention;
FIG. 6 is a flowchart illustrating a gamma voltage adjusting method of a display module according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only configured to explain the relative positional relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is configured for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a display module which is applied to a display device with a liquid crystal display screen, such as a liquid crystal television, a computer and the like.
With the development of liquid crystal televisions and computers towards the direction of super-large size and high resolution, more and more liquid crystal display panels adopt narrow-frame design to increase the display area of the display screen.
Accordingly, the gate driver for driving the lcd panel with narrow-frame design is generally disposed at the side frame of the display panel, so that the scan lines connecting the tft array and the source driver cannot be routed in equal resistance, i.e., the scan lines close to the tft array are shorter, and the scan lines far from the side edge of the tft array are longer than the scan lines between the tft array and the source driver. As can be seen from the equation of resistance calculation R ═ ρ L/S, in the case of the wires having the same cross-sectional area, the longer the length of the wire, the larger the resistance, and conversely, the smaller the resistance (where R denotes the resistance value of the wire, S denotes the cross-sectional area of the wire, L denotes the length of the wire, and ρ denotes the resistivity of the wire). The tfts in the same row are equivalently connected in parallel on the data lines in the same row, so the pixel charging voltage close to the source driver is higher than the pixel charging voltage far from the source driver. It can be understood that the higher the saturation of the pixel charging voltage is, the brighter the display panel is, and vice versa, the darker the display panel is, so that the brightness of the display area close to the source driver is greater than that of the display area far away from the source driver, so that the brightness of the area far away from the source driver and the area near the source driver of the panel are not uniform due to charging.
In order to solve the above problem, referring to fig. 1 to 5, in an embodiment of the invention, the display module includes:
the display device comprises a display panel 100, wherein a pixel array is arranged in the display panel 100;
the timing controller 200 is configured to count enable signals of charged sub-pixels in each row in the pixel array when the display module works, and output a plurality of control signals according to the counted times;
a gamma circuit 300 configured to generate a plurality of sets of gamma reference voltages according to the corresponding control signals, wherein the voltage values of the plurality of sets of gamma reference voltages are sequentially increased;
and the source driver 400 is configured to drive the sub-pixels of the corresponding row to operate according to the corresponding gamma reference voltage. The source driver 400 is connected to the sources of the sub-pixels of each column of the display panel via a plurality of data lines (D1-Dn) in a one-to-one correspondence.
In this embodiment, the display module further includes a gate driver 500 and a power management integrated circuit 600 configured to output a gate-on voltage and/or a gate-off voltage, the timing controller 200 is respectively connected to the gate driver 500, the source driver 400 and the power management integrated circuit 600, the timing controller 200 is configured to receive a data signal, a control signal and a clock signal output by an external circuit module, for example, a control system SOC of a television, and convert the data signal, the control signal and the clock signal into data signals, control signals and clock signals suitable for the gate driver 500 and the source driver 400, so as to realize image display of the display panel 100. The signal format input by the timing controller 200 generally includes transistor-transistor logic signal TTL, Low Voltage Differential Signaling (LVDS), embedded display signal (eDP) and V-by-One signals. The control signals output from the timing controller 200 include a gate control signal and a source control signal, and the source driving signal includes a Start Horizontal (STH) signal, a Clock Pulse (CPH) signal, a data output signal (TP), and a data polarity inversion signal (MPOL or POL). The gate driving signals include a frame Start Signal (STV), a scan Clock signal (CPV), and an Enable signal (OE). The power management integrated circuit 600 is used to provide input power to the gamma circuit 300 and the common electrode voltage Vcom circuit, generate a gate-on voltage Vgh/off voltage Vgl for the gate driver 500, and drive the gate driver 500, the source driver 400, the timing controller 200 to operate, and the like. The display module is generally further provided with a connector 20, the connector 20 can be connected to control chips such as a main controller or a video processing chip of the display device through a communication bus, and when the number of the external control chips is multiple, each external control chip is connected to the timing controller 200 through a serial communication bus. The timing controller 200 is connected to a main control board of the display device through a connector, and the timing controller 200 outputs corresponding timing control signals to the source driver 400 and the gate driver 500 after data processing of R/G/B compression signals and control signals received from the main control board of the display device, so that the source driver 400 generates data voltage signals after processing the accessed data signals according to gamma voltages generated by the gamma circuit 300; and making the gate driver 500 process the gate-on voltage Vgh/off voltage Vgl outputted from the power management integrated circuit 600 to generate a line scanning signal, thereby driving the display region to operate.
In this embodiment, the timing controller 200 performs the number detection of the effective data signals DE (data enable) for each frame of video data output to the display panel 100 line by line, that is, after the line scanning of each line of sub-pixels is finished, an indication signal, that is, the effective data signals DE, is transmitted in line units, and when the effective data signals DE are at the high level H, the effective data transmission time is one line, and when the effective data signals DE are at the low level L, the effective data transmission end is indicated. The timing controller 200 of this embodiment can determine whether a line is finished according to the received data valid signal DE, and count the received low-level data valid signal DE to obtain the position of the current scanning line. After the position of the scan line relative to the source driver 400 is known, different control signals are output, for example, the scan line may be divided into a number smaller than 300, 300 to 500, and a number larger than 500, so that the first control signal is output at the current scanning position, that is, when the count number of the received data valid signal DE is smaller than 300, the second control signal is output when the count number of the received data valid signal DE is between 300 and 500, and the third control signal is output when the count number of the received data valid signal DE is larger than 500. Of course, in other embodiments, the number of the control signals may be two, four, or more than four, and specifically may be set according to the brightness difference of the display panel 100, and correspondingly, the number of the sets of the gamma voltages output by the gamma circuit 300 may also be multiple, and the number may also be set according to the number of the control signals and the number of the partitions of the display panel.
In this embodiment, the gamma circuit 300 can be implemented by a programmable gamma chip or by discrete components such as a resistor string and a memory, and can generate multiple sets of gamma voltages with different amplitudes, each set of gamma voltage (V)γ1～Vγ14) Can be used as the pixel gray scale reference voltage, and the number of the groups generated by the gamma circuit 300 corresponds to the number of the control signals output by the timing controller 200. The present embodiment can be selected from three groups, three groups of gamma voltages (V)γ1～Vγ14) Is sequentially incremented according to the first control signal, the second control signal, and the third control signal. I.e. V corresponding to the first control signalγ1Is less than the corresponding V of the second control signalγ1And the second control signal corresponds to Vγ1Is smaller than V corresponding to the third control signalγ1The amplitude of (c). By analogy, Vγ2，Vγ3，…，Vγ14Each corresponding to a control signal received by the gamma circuit 300.
Wherein, multiple sets of gamma voltages (V)γ1～Vγ14) The voltage difference between the first and second display areas is a compensation voltage Δ V obtained according to a display area brightness difference Δ T corresponding to a scanning line in the display panel 100, for example, a display area corresponding to a scanning line smaller than 300 is denoted as a first display area a, a corresponding scanning line 300-500 is denoted as a second display area B, a corresponding scanning line larger than 500 is denoted as a third display area, a brightness difference between the first display area a and the second display area B is Δ T1, a brightness difference between the second display area B and the third display area is Δ T2, and the compensation voltage Δ V may be set corresponding to the respective brightness difference, which is a voltage consumed on a data line.
In this embodiment, the source driver 400 controls the corresponding pixels in the pixel array to be charged according to the timing control signal and the gamma voltage outputted from the timing controller 200, so that the source driver 400 outputs the data signal to the corresponding pixels, thereby displaying the image to be displayed.
The display module is provided with the time schedule controller 200, so that when the display module works, the enabling signals of charging sub-pixels of each row in a pixel array are counted, and a plurality of control signals are output according to the counted times; the gamma circuit 300 is controlled to generate a plurality of gamma reference voltages according to the corresponding control signals, and the voltage values of the plurality of gamma reference voltages are sequentially increased; so that the source driver 400 operates the sub-pixels corresponding to the pixel array in the display panel 100 according to the gamma reference voltage. The invention solves the problem of uneven brightness caused by uneven routing resistance of the data lines in the area of the display panel 100 far away from the source driver 400 and the area close to the source driver 400. The invention improves the brightness uniformity of the display panel.
Referring to fig. 3, in an embodiment, the timing controller 200 includes a row counter 210 and a control unit 220, the control unit 220 is configured to output a first control signal when the display module operates, the row counter 210 is configured to count an enable signal that is charged to each row of sub-pixels in an access pixel array, and when the count number reaches a preset number, the control unit 220 is triggered to output a second control signal.
In this embodiment, the control unit 220 is used for outputting a first control signal to the gamma circuit 300 when the display module operates, so that the gamma circuit 300 outputs a corresponding gamma voltage. The line counter 210 is configured to perform number detection on data valid signals DE (data enable) for each frame of video data output to the display panel 100 line by line, and the line counter 210 may determine whether a line is finished according to the received data valid signals DE, and count the received low-level data valid signals DE to obtain the position of the current scanning line. The row counter 210 adds 1 to each row X after charging, and the counting threshold of the far end (the end far from the source driver 400) is 500, that is, when the row counter 210 counts X >500, and it is considered that charging has been completed to the far end, the row counter 210 triggers the control unit 220 to output a second control signal to the gamma circuit 300, so that the gamma circuit 300 outputs a corresponding gamma voltage, and the source driver 400 is driven to control each thin film transistor in the corresponding display area to operate according to the corresponding gamma voltage, thereby ensuring that the charging saturation of the pixels in each display area is the same or substantially the same. In this embodiment, the first control signal and the second control signal may be two level signals with opposite polarities, for example, when the first control signal is at a high level, the second control signal is at a low level, and when the first control signal is at a low level, the second control signal is at a high level.
Referring to fig. 1 to 5, in an embodiment, the gamma circuit 300 is a programmable gamma chip, and the programmable gamma chip includes:
a first memory 310 configured to output a first gamma reference voltage according to the first control signal, and a second memory 320 configured to output a second gamma reference voltage according to the second control signal; the first gamma reference voltage is less than the second gamma reference voltage;
the digital-to-analog converter 330 includes two input ends and an output end, the two input ends of the digital-to-analog converter 330 are connected to the first memory 310 and the second memory 320 in a one-to-one correspondence manner, the output end of the digital-to-analog converter 330 is connected to the input end of the source driver 400, and the digital-to-analog converter 330 is configured to perform digital-to-analog conversion on the digital first gamma reference voltage output by the first memory 310 or the digital second gamma reference voltage output by the second memory 320 and output the digital first gamma reference voltage or the digital second gamma reference voltage to the source driver 400.
In this embodiment, the gamma voltage and the brightness of the display panel 100 at each gray level can be reflected by a voltage-brightness V-T curve, and the two have a mapping relationship, that is, each brightness level of the display panel 100 corresponds to one gamma voltage, and after the brightness of the display panel 100 is obtained, the gamma voltage corresponding to the brightness of the display panel 100 at the current gray level of the display panel 100 can be obtained by reading the voltage-brightness V-T curve of the display panel 100. Specifically, the present embodiment may divide the display panel 100 into the first display regions a according to the distance from the source driver 400And a second display area B, after the brightness of the first display area A11 and the second display area B12 is obtained, the brightness difference delta T of the first display area A11 and the second display area B12 is calculated, the gamma voltage value of the first display area A11 and the gamma voltage value of the second display area B12 are read through a voltage-brightness V-T curve, the gamma voltage value of the first display area A11 and the gamma voltage value of the second display area B12 are subjected to difference calculation, and therefore a voltage difference is obtained, and the voltage difference is the compensation voltage delta V. In this embodiment, the first memory 310 is used for storing the gamma voltage V1 corresponding to the first display area a, the second display area B is used for storing the gamma voltage V2 corresponding to the second display area B, and the relationship between V1 and V2 is: v2 ═ V1 +. Δ V. That is, gamma voltages V of gamma 1 in the first set of gamma voltagesγ1AAt a second set of gamma voltages Vγ1BBetween them there is Vγ1B＝Vγ1AA relation of +. DELTA.V.
The digital-to-analog converter 330 is used for converting the digital gamma voltage stored in the memory into an analog gamma voltage and outputting the analog gamma voltage to the source driver 400. It can be understood that two memories are integrated in the programmable gamma chip, and the programmable gamma chip is used in the embodiment without adding a hardware circuit, so that the gamma correction cost of the display module can be reduced.
Referring to fig. 1 to 5, in an embodiment, the programmable gamma chip further includes a voltage follower 340, an input terminal of the voltage follower 340 is connected to an output terminal of the digital-to-analog converter 330, and an output terminal of the voltage follower 340 is connected to the source driver 400;
the voltage follower 340 is configured to amplify and correct the current driving capability of the multiple sets of gamma reference voltages generated by the digital-to-analog converter 330, so as to improve the driving capability of the gamma voltages.
In the above embodiment, a plurality of memories may be further disposed in the programmable gamma chip, and the number of the memories may be set according to the level of the brightness difference of the display panel 100, for example, two levels of the brightness difference of the display panel 100 are set, and if there are three levels, three levels are set. The plurality of memories respectively store a set of gamma voltages (V) representing different display regionsγ1～Vγ14) Each ofThe gamma voltages of one set are different in voltage value and sequentially increase from the source driver 400 to the source driver 400, and the voltage difference of each set can be set according to the brightness difference of each display region.
Referring to fig. 1 to 5, in an embodiment, the source driver 400 is disposed at one side of the display panel 100;
the display panel 100 has a first display region a disposed near the source driver 400 and a second display region B disposed far from the source driver 400;
the pixel array comprises a plurality of rows of first sub-pixels arranged in the first display area A and a plurality of rows of second sub-pixels arranged in the second display area B.
In this embodiment, the display panel 100 may be divided into the first display area a and the second display area B according to the distance from the source driver 400, and certainly in other embodiments, the display panel 100 may be further divided into more than two display areas according to the distance from the source driver 400, so as to output the corresponding gamma voltages according to the brightness clearance of different display areas, thereby further improving the problem of uneven brightness caused by uneven routing resistance of the data lines in the area of the display panel 100 away from the source driver 400 and the area close to the source driver 400.
Referring to fig. 1 to 5, in an embodiment, the source driver 400 is specifically configured to drive a plurality of rows of first sub-pixels in the first display area a to operate according to the first gamma reference voltage, and drive a plurality of rows of second sub-pixels in the first display area a to operate according to the second gamma reference voltage.
In an embodiment, the display module further includes a gate driver 500 and a plurality of scan lines, and a plurality of output terminals of the gate driver 500 are correspondingly connected to the gates of each row of sub-pixels in the pixel array through the scan lines.
In the above embodiments, the pixel array includes a plurality of sub-pixels, each of the sub-pixels includes an active switch (thin film transistor) and a pixel electrode, a gate of the active switch T is electrically connected to a scan line corresponding to the sub-pixel, a source of the active switch is electrically connected to a data line corresponding to the pixel unit, and a drain of the active switch is electrically connected to the pixel electrode of the sub-pixel. The pixel array further includes an array of pixel electrodes connected to the array of active switching elements.
The display panel 100 is composed of a plurality of pixels, each of which is composed of three sub-pixels of red, green and blue. Each sub-pixel circuit structure is generally provided with a thin film transistor and a capacitor, the gate of the thin film transistor is connected to the gate driver 500 through a scan line, the source of the thin film transistor is connected to the source driver 400 through a data line, and the drain of the thin film transistor is connected to one end of the capacitor. Wherein the plurality of thin film transistors form a thin film transistor array (not shown). The tfts in the same column are connected to the source driver 400 through a data line, and the tfts in the same row are connected to the gate driver 500 through a scan line, thereby forming a tft array. These thin film transistors may be a-Si (non-Silicon) thin film transistors or Poly-Si (polysilicon) thin film transistors, which may be formed using LTPS (Low Temperature polysilicon) or the like.
Referring to fig. 1 to 5, in an embodiment, the timing controller 200 is specifically configured to output a first control signal when the display module operates, count enable signals of charged sub-pixels in each row of the access pixel array, and output a second control signal when the count reaches a first preset number; and outputting a third control signal when the counting number reaches a second preset number.
In this embodiment, the timing controller 200 may be divided into three display regions according to the distance from the source driver 400 in the display panel 100, and the three display regions correspond to regions where the scan lines (G1-G2 n +2) are less than 300, 300-500, and more than 500, respectively, so that the first control signal is output when the count number of the received data valid signals DE is less than 300, the second control signal is output when the count number of the received data valid signals DE is between 300 and 500, and the third control signal is output when the count number of the received data valid signals DE is more than 500 at the current scanning position.
Referring to fig. 1 to 5, in an embodiment, the display module further includes a memory, the memory 20 is preferably implemented by an eeprom 20, a timing control program run by the timing controller 200 is mostly stored in the eeprom 20, for example, control signals for driving a gate driver ic and a source driver ic to operate, the memory is communicatively connected to the timing controller 200 through an I2C (Inter-Integrated Circuit) communication bus, when the display device is powered on, the timing controller 200 reads the control signals in the memory and performs initial setting on other setting data to generate corresponding timing control signals, so as to drive the source driver ic and the gate driver ic of the display panel 100 in the display device to operate.
The invention also provides a gamma voltage regulating method of the display module, and the display module comprises the following steps: the display device comprises a source driver, a display panel and a gamma circuit; wherein the gamma circuit includes a first gamma voltage output unit and a second gamma voltage output unit; a pixel array is arranged in the display panel;
referring to fig. 6, in an embodiment of the invention, the method for adjusting gamma voltage of a display module includes the following steps:
step S100, when the display module works, controlling a first gamma voltage output unit to output a first gamma voltage, so that the source driver drives first sub-pixels of a corresponding row in the first display area to work according to the first gamma voltage;
step S200 is to count the enable signals of the charged sub-pixels in each row in the pixel array, and when the count reaches a preset number, control the second gamma voltage output unit to output the second gamma voltage, so that the source driver drives the corresponding second sub-pixels in the second display area to operate according to the second gamma voltage.
In this embodiment, the gamma voltage output by the first gamma voltage output unit is smaller than the gamma voltage output by the second gamma voltage output unit, the gamma voltage and the brightness of the display panel at each gray scale can be reflected by a voltage-brightness V-T curve, and the two have a mapping relationship, that is, each brightness level of the display panel corresponds to one gamma voltage, and after the brightness of the display panel is obtained, the gamma voltage corresponding to the brightness of the display panel at the current gray scale of the display panel can be obtained by reading the voltage-brightness V-T curve of the display panel. Specifically, according to the difference of display brightness, the region close to the source driver is marked as a first display region, the region far away from the source driver is shown as a second display region, after the brightness of the first display region and the brightness of the second display region are obtained, the brightness difference Δ T between the first display region and the second display region are calculated, the gamma voltage value of the first display region, namely the first gamma voltage V1, and the gamma voltage value of the second display region, namely the second gamma voltage V2 are read through a voltage-brightness V-T curve, and difference calculation is performed on the gamma voltage value of the first display region and the gamma voltage value of the second display region, so that a voltage difference is obtained, namely the compensation voltage Δ V. Wherein the first gamma voltage and the second gamma voltage satisfy V2 ═ V1 +. DELTA.v. When the display module works, the charging enable signals arranged in the first display area and the second display area can be counted, when the counting times reach the preset times, namely when the current charging is carried out to the second display area, the second control signals are output to control the gamma circuit to output the second gamma voltage, and therefore the source electrode driver is controlled to charge the sub-pixels in the second display area according to the second gamma voltage. The invention solves the problem of uneven brightness caused by uneven wiring resistance of the data lines in the area of the display panel far away from the source driver and the area close to the source driver.
The invention also provides a display device which comprises the display module. The detailed structure of the display module can refer to the above embodiments, and is not described herein again; it can be understood that, since the display module is used in the display device of the present invention, the embodiment of the display device of the present invention includes all technical solutions of all embodiments of the display module, and the achieved technical effects are also completely the same, and are not described herein again.
The display device can be any one of a liquid crystal television, a computer, a projector or a mobile phone with the display module.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a display module assembly, its characterized in that, display module assembly includes:
the display panel is internally provided with a pixel array;
the time schedule controller is configured to count the enabling signals of the charged sub-pixels in each row in the pixel array when the display module works, and output corresponding control signals according to the counted times;
the gamma circuit is configured to generate a plurality of groups of gamma reference voltages according to the corresponding control signals, and the voltage values of the plurality of groups of gamma reference voltages are sequentially increased; and
the source driver is configured to drive corresponding rows of the sub-pixels to work according to the corresponding gamma reference voltages;
the time schedule controller comprises a row counter and a control unit, the control unit is configured to output a first control signal when the display module works, the row counter is configured to count enable signals of charged sub-pixels of each row in an access pixel array, and the control unit is triggered to output a second control signal when the counting times reach preset times;
the gamma circuit is a programmable gamma chip, and the programmable gamma chip comprises:
a first memory configured to output a first gamma reference voltage according to the first control signal;
a second memory configured to output a second gamma reference voltage according to the second control signal; the first gamma reference voltage is less than the second gamma reference voltage.
2. The display module of claim 1, wherein the programmable gamma chip further comprises:
and the digital-to-analog converter comprises two input ends and an output end, the two input ends of the digital-to-analog converter are correspondingly connected with the first memory and the second memory one by one, the output end of the digital-to-analog converter is connected with the input end of the source driver, and the digital-to-analog converter is configured to perform digital-to-analog conversion on the digital first gamma reference voltage output by the first memory or the digital second gamma reference voltage output by the second memory and then output the digital first gamma reference voltage or the digital second gamma reference voltage to the source driver.
3. The display module as claimed in claim 2, wherein the programmable gamma chip further comprises a voltage follower, an input terminal of the voltage follower is connected to an output terminal of the digital-to-analog converter, and an output terminal of the voltage follower is connected to an input terminal of the source driver;
the voltage follower is configured to amplify and correct the current driving capability of the multiple groups of gamma reference voltages generated by the digital-to-analog converter.
4. The display module as claimed in claim 1, wherein the source driver is disposed at one side of the display panel;
the display panel is provided with a first display area arranged close to the source driver and a second display area arranged far away from the source driver;
the pixel array comprises a plurality of rows of first sub-pixels arranged in the first display area and a plurality of rows of second sub-pixels arranged in the second display area.
5. The display module as claimed in claim 4, wherein the source driver is specifically configured to drive a plurality of rows of first sub-pixels in the first display region to operate according to the first gamma reference voltage, and to drive a plurality of rows of second sub-pixels in the second display region to operate according to the second gamma reference voltage.
6. The display module of claim 1, wherein the display module further comprises a gate driver and a plurality of scan lines, and a plurality of output terminals of the gate driver are connected with the gates of the sub-pixels in each row of the pixel array in a one-to-one correspondence manner through the scan lines.
7. The display module of claim 1, wherein the timing controller is specifically configured to output a first control signal when the display module is operating, to count an enable signal for charging each row of sub-pixels accessed to the pixel array, and to output a second control signal when the count reaches a first preset number; and outputting a third control signal when the counting number reaches a second preset number.
8. A display device, comprising the display module according to any one of claims 1 to 7.
9. The utility model provides a gamma voltage regulation method of display module assembly which characterized in that, the display module assembly includes: the display device comprises a source driver, a display panel and a gamma circuit; wherein the gamma circuit includes a first gamma voltage output unit and a second gamma voltage output unit; a pixel array is arranged in the display panel; the display panel comprises a first display area and a second display area;
the gamma voltage regulating method of the display module comprises the following steps:
when the display module works, the first gamma voltage output unit is controlled to output a first gamma voltage, so that the source electrode driver drives a plurality of corresponding rows of first sub-pixels in the first display area to work according to the first gamma voltage;
and counting the enable signals of charged sub-pixels of each row in the pixel array, and controlling the second gamma voltage output unit to output a second gamma voltage when the count reaches a preset number of times, so that the source driver drives the corresponding second sub-pixels of the plurality of rows in the second display area to work according to the second gamma voltage.
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176206B (en) * | 2019-05-06 | 2021-06-18 | 重庆惠科金渝光电科技有限公司 | Drive circuit, drive circuit connection information determination method, and display device |
| CN110473499B (en) * | 2019-07-18 | 2023-11-21 | 武汉天马微电子有限公司 | Gamma voltage debugging method for display panel, display panel and display device |
| CN110444178B (en) | 2019-08-20 | 2022-01-11 | 京东方科技集团股份有限公司 | Driving method, driving device and display equipment |
| CN110956926B (en) * | 2019-12-26 | 2021-04-09 | 苏州椒图电子有限公司 | Display screen driving control method and device and display screen |
| CN113851067B (en) * | 2020-06-28 | 2023-07-04 | 京东方科技集团股份有限公司 | Charging circuit, display device, wearable equipment and display driving method and device |
| CN111883081A (en) * | 2020-07-28 | 2020-11-03 | 重庆惠科金渝光电科技有限公司 | Display driving circuit and display panel |
| CN112037725B (en) * | 2020-08-28 | 2023-01-10 | 青岛信芯微电子科技股份有限公司 | Display device and display method |
| CN112669783B (en) * | 2020-12-29 | 2023-01-10 | Tcl华星光电技术有限公司 | Data signal regulating circuit and display device |
| CN112951141A (en) * | 2021-02-26 | 2021-06-11 | 合肥京东方显示技术有限公司 | Drive circuit and display panel |
| CN112863456A (en) * | 2021-03-02 | 2021-05-28 | 重庆先进光电显示技术研究院 | Display module, gamma voltage adjusting method of display module and display device |
| CN113066433B (en) * | 2021-03-24 | 2022-07-19 | 京东方科技集团股份有限公司 | Driving circuit of display panel, display module, compensation method of display module and display device |
| CN113393817A (en) * | 2021-06-18 | 2021-09-14 | 惠州华星光电显示有限公司 | Display device and driving method thereof |
| CN113810644A (en) * | 2021-11-18 | 2021-12-17 | 南京熊猫电子制造有限公司 | Panel driving system for high-definition video signal processing and conversion |
| CN114495794B (en) * | 2022-02-18 | 2023-12-26 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN114624909B (en) * | 2022-03-28 | 2023-06-30 | 深圳市华星光电半导体显示技术有限公司 | Display module, manufacturing method thereof and electronic terminal |
| CN114783380B (en) * | 2022-04-29 | 2023-11-28 | 京东方科技集团股份有限公司 | Display driving circuit, driving method, display panel and display device |
| WO2024000549A1 (en) * | 2022-06-30 | 2024-01-04 | 京东方科技集团股份有限公司 | Control system, vehicle-mounted display apparatus and dimming method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1477614A (en) * | 2002-08-22 | 2004-02-25 | Nec液晶技术株式会社 | Liquid crystal display driving method, liquid crystal display and monitor with the same |
| CN101339752A (en) * | 2007-07-06 | 2009-01-07 | 恩益禧电子股份有限公司 | Capacitive load driving circuit, capacitive load driving method, and driving circuit for liquid crystal display device |
| CN103474016A (en) * | 2013-09-11 | 2013-12-25 | 青岛海信电器股份有限公司 | Partition driving processing method, processing device and displayer |
| CN103943088A (en) * | 2014-04-11 | 2014-07-23 | 京东方科技集团股份有限公司 | Gamma voltage adjusting device of display panel and display device of display panel |
| CN107016977A (en) * | 2017-06-15 | 2017-08-04 | 武汉华星光电技术有限公司 | Data drive circuit and display panel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100926104B1 (en) * | 2002-12-27 | 2009-11-11 | 엘지디스플레이 주식회사 | Liquid Crystal Display and Driving Method thereof |
| KR20070118371A (en) * | 2006-06-12 | 2007-12-17 | 삼성전자주식회사 | Display apparatus and control method thereof |
| KR100815588B1 (en) * | 2006-08-16 | 2008-03-20 | 삼성전자주식회사 | Display device and method of adjusting brightness for the same |
| KR101354233B1 (en) * | 2006-12-28 | 2014-01-23 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN106297690A (en) * | 2016-08-11 | 2017-01-04 | 深圳市华星光电技术有限公司 | Gamma reference voltage generator, production method and liquid crystal indicator |
| CN109003591B (en) * | 2018-09-28 | 2021-11-30 | 惠科股份有限公司 | Driving voltage control system and display device |
-
2018
- 2018-12-24 CN CN201811587916.6A patent/CN109559696B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1477614A (en) * | 2002-08-22 | 2004-02-25 | Nec液晶技术株式会社 | Liquid crystal display driving method, liquid crystal display and monitor with the same |
| CN101339752A (en) * | 2007-07-06 | 2009-01-07 | 恩益禧电子股份有限公司 | Capacitive load driving circuit, capacitive load driving method, and driving circuit for liquid crystal display device |
| CN103474016A (en) * | 2013-09-11 | 2013-12-25 | 青岛海信电器股份有限公司 | Partition driving processing method, processing device and displayer |
| CN103943088A (en) * | 2014-04-11 | 2014-07-23 | 京东方科技集团股份有限公司 | Gamma voltage adjusting device of display panel and display device of display panel |
| CN107016977A (en) * | 2017-06-15 | 2017-08-04 | 武汉华星光电技术有限公司 | Data drive circuit and display panel |
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| Publication number | Publication date |
|---|---|
| CN109559696A (en) | 2019-04-02 |
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