CN110379396B - Gamma voltage generation method, generation circuit, source electrode driving circuit, driving chip and display device - Google Patents
Gamma voltage generation method, generation circuit, source electrode driving circuit, driving chip and display device Download PDFInfo
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- CN110379396B CN110379396B CN201910539141.3A CN201910539141A CN110379396B CN 110379396 B CN110379396 B CN 110379396B CN 201910539141 A CN201910539141 A CN 201910539141A CN 110379396 B CN110379396 B CN 110379396B
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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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 gamma voltage generation method, which comprises the following steps: providing a plurality of reference voltages, wherein the connection node of every two adjacent resistance units receives the corresponding reference voltage; the resistance unit provides at least one level of gamma voltage according to the reference voltage received by the resistance unit and a corresponding proportionality coefficient; and setting the proportionality coefficient of each resistance unit respectively so as to adjust the gamma voltage of each level. The invention also discloses a gamma voltage generating circuit, a source electrode driving circuit, a driving chip and a display device. The adjustment of the reference voltage resistance defined by the customer can be more flexible, and the performance of the display panel is better. Meanwhile, the design combination can be better designed and combined according to other key factors such as chip area, power consumption, state conversion speed and the like.
Description
Technical Field
The invention relates to the technical field of display, in particular to a gamma voltage generation method, a generation circuit, a source electrode driving circuit, a driving chip and a display device.
Background
A conventional display panel, such as a liquid crystal display panel, includes a plurality of pixel units arranged in an array, each pixel unit includes three sub-pixels, namely, red, green, and blue sub-pixels, and a pixel electrode in each sub-pixel is connected to a Gamma (Gamma) voltage. The gamma voltages are used for controlling the display gray scale (namely brightness) of the sub-pixels, and the liquid crystal molecules are rotated to different degrees by the voltage difference between different gamma voltages and the common electrode voltage, so that the difference of light transmittance is generated, and the gray scale is displayed.
The gamma voltage determination method comprises the following steps: fitting a required gamma curve (i.e. an ideal gamma curve) through a gray scale-light transmittance curve of the liquid crystal display panel, and calculating the gamma voltage corresponding to each gray scale according to the ideal gamma curve and a V-T curve (i.e. a voltage-light transmittance curve of the liquid crystal) of the liquid crystal.
The gamma voltages need corresponding gamma voltage generating circuits, and at present, the gamma voltage generating circuits usually generate the gamma voltages by serially connecting resistors for voltage division. In the display device, a gamma voltage generating circuit is mounted on a display panel driver to drive a display panel such as a liquid crystal display panel by a driving voltage. The gamma voltage generating circuit means a circuit that generates gamma voltages corresponding to respective ones of the levels available on the display panel. In a typical display panel driver, gamma voltages generated in a gamma voltage generation circuit are selected according to gray-scale data of display pixels, and the corresponding pixels are driven by the selected gamma voltages.
Some of the reference voltage resistors of the conventional display panel driving IC need to have the same variation on the whole of a plurality of resistance values, which affects the performance of the display panel.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a gamma voltage generating method, a generating circuit, a source driving circuit, a driving chip and a display device, which can make the adjustment of the reference voltage resistance defined by the client more flexible and make the performance of the display panel better. Meanwhile, better design combination can be performed according to power consumption, speed of a rotary table, area or other key factors.
According to the present invention, there is provided a control method of a gamma voltage generating circuit including a plurality of resistance units connected in series between a power supply terminal and a ground reference terminal, the control method comprising: providing a plurality of reference voltages, wherein the connection node of every two adjacent resistance units receives the corresponding reference voltage; the resistance unit provides at least one level of gamma voltage according to the reference voltage received by the resistance unit and a corresponding proportionality coefficient; and setting the proportionality coefficient of each resistance unit respectively so as to adjust the gamma voltage of each level.
Preferably, the proportionality coefficients of different said resistance units are the same or different.
Preferably, the step of adjusting the gamma voltages of the respective stages includes: and adjusting the resistance value of the corresponding resistance unit according to the proportionality coefficient.
Preferably, the resistance unit includes at least one sub-resistance connected in series between the respective two connection nodes, the sub-resistance providing the respective one of the gamma voltages according to the proportionality coefficient of the resistance unit.
Preferably, in the resistor unit, the resistance value of each of the sub-resistors is equal to the product of the initial resistance value of the sub-resistor and the scaling factor corresponding to the resistor unit.
Preferably, the plurality of reference voltages are buffered, and a connection node of each two adjacent resistance units receives the buffered reference voltage.
According to the present invention, there is provided a gamma voltage generating circuit, comprising: the resistance units are connected between a power supply terminal and a reference grounding terminal in series, the connection node of every two adjacent resistance units receives corresponding reference voltage, and the resistance units provide at least one level of gamma voltage according to the reference voltage received by the resistance units; and the control circuit is used for respectively adjusting the gamma voltages of all levels according to the proportional coefficients corresponding to all the resistance units.
Preferably, the reference voltage is provided by a power supply circuit.
Preferably, the proportionality coefficients of different said resistance units are the same or different.
Preferably, the plurality of resistance units are implemented by conductor traces connected between the power supply terminal and the reference ground terminal, and the control circuit adjusts the positions of the connection nodes on the conductor traces according to the proportionality coefficients, so as to adjust the lengths of the conductor traces corresponding to the resistance units respectively.
Preferably, the resistance unit includes at least one sub-resistance connected in series between the respective two connection nodes, the sub-resistance providing the respective one of the gamma voltages according to the proportionality coefficient of the resistance unit.
Preferably, in the resistor unit, the resistance value of each of the sub-resistors is equal to the product of the initial resistance value of the sub-resistor and the scaling factor corresponding to the resistor unit.
Preferably, the method further comprises the following steps: the buffers are used for receiving reference voltage, buffering the reference voltage and outputting the buffered reference voltage to the resistor units.
According to the present invention, there is provided a source driving circuit, comprising: the gamma voltage generating circuit is used for generating a plurality of gamma voltages according to a plurality of reference voltages; the data register receives and stores gray scale data of the display pixels; a latch connected to the data register, latching the gray scale data in response to a strobe signal, and outputting the latched gray scale data; the level shifter is connected with the latch and is used for performing level conversion on the gray scale data and outputting the gray scale data; the digital-to-analog converter is respectively connected with the gamma voltage generating circuit and the level converter and outputs one of the gamma voltages according to the gray scale data; and the input end of the output circuit is connected with the digital-to-analog converter, and the output end of the output circuit is connected with the data line, receives the gamma voltage and drives the data line to a driving voltage corresponding to the gamma voltage.
According to the driving chip provided by the invention, the source driving circuit is integrated on the driving chip.
According to the present invention, there is provided a display device comprising: the display panel comprises a plurality of data lines, a plurality of scanning lines and a plurality of pixels; the grid driving circuit is connected with the plurality of scanning lines of the display panel and used for sequentially driving the plurality of scanning lines of the display panel; the source electrode driving circuit is connected with the data lines of the display panel and is used for driving the data lines of the display panel according to the gray scale data of the display pixel level; and the power supply circuit is connected with the source driving circuit and is used for generating a plurality of reference voltages.
Preferably, the display panel includes, but is not limited to: a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, a Mini-LED display panel, a field emission display panel, a plasma display panel, an electrophoresis display panel, or an electrowetting display panel.
The invention has the beneficial effects that: the invention adjusts the resistance between different adjacent input ends of the resistor string in the gamma voltage generating circuit according to different adjusting proportions, thereby realizing flexible adjustment of the reference voltage resistance defined by a client and enabling the performance of the display panel to be better.
Meanwhile, the driving chip manufactured by the method has small current, low energy consumption and high state conversion speed, and can realize better matching of other key factors such as chip area, power consumption, state conversion speed and the like.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a first exemplary structure of a gamma voltage generating circuit in the display device of FIG. 1;
FIG. 3 is a diagram illustrating a second exemplary structure of a gamma voltage generating circuit in the display apparatus of FIG. 1;
fig. 4 is a flowchart illustrating a gamma voltage generating method according to an embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention.
As shown in fig. 1, the display device 100 includes a display panel 1, a power supply circuit 2, a source drive circuit 3, and a gate drive circuit 4.
The display panel 1 includes a plurality of data lines 5, a plurality of scan lines 6, and a plurality of pixels 7, and the plurality of pixels 7 are disposed at positions where the corresponding data lines 5 and the scan lines 6 intersect. Any one of the pixels 7 includes a TFT (thin film transistor) 8, a pixel electrode 9a, and a common electrode 9b having a common voltage Vcom placed opposite to the pixel electrode 9 a.
Further, the display panel 1 includes, but is not limited to: any one of a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, a Mini-LED display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, or an electrowetting display panel.
Alternatively, in the liquid crystal display panel, a space between the pixel electrode 9a and the common electrode 9b is filled with liquid crystal.
The power circuit 2 is connected to the source driving circuit 3 for providing the source driving circuit 3 with the reference voltage VE 1-VEm. As described below, the reference voltages VE1-VEm are used to generate the gamma voltages V1-Vn. Further, the power supply circuit 2 may be located within the timing control circuit. Wherein m and n are both natural numbers.
The source driving circuit 3 is connected to a plurality of data lines 5 of the display panel 1 for driving the data lines 5 of the display panel 1 according to the gray-scale data DIN of the display pixel level. More specifically, the source driving circuit 3 includes a data register 11, a latch 12, a gamma voltage generating circuit 13, a digital-to-analog (D/a) converter 14, an output circuit 15, and a level shifter 16. Wherein, the input end of the latch 12 is connected with the output end of the data register 11; the input of level shifter 16 is connected to the output of latch 12; a part of input terminals of the digital-to-analog (D/a) converter 14 are connected to the output terminal of the level shifter 16, another part of input terminals are connected to the output terminal of the gamma voltage generating circuit 13, and an output terminal of the digital-to-analog (D/a) converter 14 is connected to an input terminal of the output circuit 15.
In the present embodiment, the data register 11 receives and stores the gray scale data DIN of the display pixel 7. The latch 12 latches the gray scale data DIN from the data register 11 in response to the strobe signal ST and transmits the latched gray scale data DIN to the level shifter 16. The level shifter 16 is used for receiving the gray scale data DIN, performing level shifting on the gray scale data DIN, and outputting the gray scale data DIN to the digital-to-analog converter 14. The gamma voltage generating circuit 13 generates gamma voltages V1-Vn according to the reference voltages VE1-VEm received from the power supply circuit 2. The digital-to-analog converter 14 selects the gamma voltages V1-Vn in accordance with the gray-scale data DIN, and outputs the selected gamma voltages to the output circuit 15. The output circuit 15 includes a plurality of voltage followers which are connected in one-to-one correspondence with the plurality of data lines 5 and drive each data line 5 to a drive voltage corresponding to the gamma voltage supplied from the digital-to-analog converter 14.
The gate driving circuit 4 is connected to a plurality of scan lines 6 of the display panel 1 for sequentially driving the scan lines 6 on the display panel 1. When the data line 5 is driven in a state where the scan line 6 is activated, a driving voltage is written in the pixel 7 connected to the activated scan line 6 via the data line 5, and thereby the pixel 7 is driven.
Fig. 2 illustrates a first exemplary structure diagram of a gamma voltage generating circuit in the display apparatus of fig. 1.
As shown in fig. 2, the power supply circuit 2 includes a constant voltage source 21 and a first resistor string 22. Constant voltage source 21 supplies a prescribed voltage to both ends of first resistor string 22. The first resistor string 22 outputs reference voltages VE1-VEm from a plurality of output terminals, respectively (the first reference voltage VE1 and the second reference voltage VEm are the highest voltage and the lowest voltage of the reference voltages, respectively). The first resistor string 22 includes a plurality of resistors Rr0 to Rrm connected in series, and the first resistor string 22 is configured such that a resistance value between adjacent output terminals can be variable, so that the reference voltage VE1-VEm can be adjusted. In the present embodiment, the reference voltages VE1-VEm can be optimally adjusted according to the characteristics of the display panel 1.
The gamma voltage generating circuit 13 includes a second resistor string 132 connected between the first reference voltage VE1 and the second reference voltage VEm, and a control circuit 133.
The second resistor string 132 includes a plurality of resistor units, the plurality of resistor units are connected in series between a power supply terminal (e.g., the reference voltage VE1) and a reference ground terminal (e.g., the reference voltage VEm), a connection node of every two adjacent resistor units receives the corresponding reference voltage VE1-VEm, and any one of the resistor units provides at least one level of gamma voltage according to the reference voltage received by the resistor unit. Meanwhile, the resistance unit includes at least one sub-resistance connected in series between the corresponding two connection nodes, and the sub-resistance provides a corresponding primary gamma voltage according to a proportionality coefficient of the resistance unit.
In this embodiment, the second resistor string 132 includes a plurality of resistors R1-Rn connected in series with each other, and a plurality of connection nodes a at any two connected resistors1～anA portion of the plurality of connected nodes may be selected as input nodes (e.g., node a)3And node an-2) To receive a plurality of reference voltages VE 1-VEm. Meanwhile, a plurality of connection nodes a on the second resistor string 132 are connected1～anAs an output node to output a plurality of gamma voltages V1-Vn of different levels.
Preferably, the number of the reference voltages is the same as the number of the input nodes, and the selection of the plurality of input nodes and the determination of the resistance values of the plurality of resistor units may be performed according to a gamma curve of the display panel 1.
Further, taking a binary coded Data Driver (Data Driver) with 6 bits (bit) as an example, the change process from full white to full black can be divided into 2664 gray levels, 64 sets of gamma voltages need to be generated. In fig. 2, n is equal to 64 and m is equal to 7 for understanding: gamma voltage generationThe generating circuit 13 includes 64 resistors R1-R64, 7 input terminals and 64 output terminals connected in series in sequence, and is used for generating 64 sets of gamma voltages V1-V64 according to 7 reference voltages VE1-VE 7. Wherein, some gamma voltages such as V1, V3, V (n-2) and Vn are provided by reference voltages VE1-VE 7, respectively, and the rest voltages are generated by resistor voltage division.
The control circuit 133 is connected to the second resistor string 132, and is configured to adjust the gamma voltages of the respective stages according to the respective proportionality coefficients corresponding to the respective resistor units.
In this embodiment, the resistor unit includes at least one sub-resistor connected in series between two corresponding connection nodes, and the resistor unit is correspondingly provided with a proportionality coefficient, where the proportionality coefficient is used to increase resistance values of a plurality of sub-resistors in the resistor unit when voltage division of the reference voltage is performed, so as to reduce current in the circuit and reduce energy consumption. And the resistance unit outputs at least one level of gamma voltage according to the corresponding proportionality coefficient.
Further, in an embodiment of the present invention, the plurality of resistor units are implemented by conductor traces connected between the power supply terminal and the reference ground terminal, and the control circuit 133 may adjust positions of the connection nodes on the conductor traces according to required scaling coefficients, so as to adjust lengths of portions of the conductor traces corresponding to the resistor units, respectively, and further implement scaling of the resistance values of the plurality of resistors in the second resistor string 132.
Further, in the resistor unit, the resistance value of each sub-resistor is equal to the product of the initial resistance value of the sub-resistor and the corresponding proportionality coefficient of the resistor unit.
Preferably, the proportionality coefficients of different resistance units are the same or different, but the proportionality coefficients of the resistances in the same resistance unit are the same. If the resistance values between the first input node and the second input node are multiplied by S1, the resistance values between the second input node and the third input node are multiplied by S2, and so on, the resistance values between the m-1 th input node and the m-th input node are multiplied by Sn. Therefore, the current can be reduced, the flexible adjustment of different resistance values can be realized, the problem of low adaptability of all resistance values in the same adjustment proportion is avoided, and the display efficiency of the display panel is improved; and then, better design combination is carried out on the chip among energy consumption, transition speed, area or other key factors. Wherein S1-Sn represent different adjustment ratios and are positive numbers.
In other embodiments of the present invention, the resistances of the resistors in the second resistor string may be adjusted in different proportions by other methods, such as using an adjustable resistor, connecting resistors with corresponding resistances in series between different output nodes, or using a selection switch to select and output the resistance among a plurality of resistors according to corresponding selection signals.
It should be understood that the above resistance value adjusting method is only exemplary, and it is within the scope of the present invention to adjust the resistance values of the plurality of resistor units in the second resistor string according to different proportionality coefficients.
Fig. 3 is a schematic diagram illustrating a second exemplary structure of a gamma voltage generating circuit in the display device of fig. 1.
As shown in FIG. 3, the gamma voltage generating circuit 13 includes a second resistor string 132 in the same manner as the gamma voltage generating circuit shown in FIG. 2, except that it further includes a plurality of buffers 131 connected to input terminals of the second resistor string 1321-131mFor ease of understanding, buffers 131 are temporally distinguished from one another herein by adding subscripts to reference numeral 131. The input terminals of the buffers 133 are connected to the output terminals of the power circuit 2 in a one-to-one correspondence, and the output terminals of the buffers 131 are connected to the input terminals of the second resistor string 132 in a one-to-one correspondence, so as to receive a plurality of reference voltages generated by the power circuit 2, buffer the reference voltages, and output the reference voltages to the second resistor string.
In this embodiment, the buffer is used to isolate the signal input terminal from the signal output terminal, so as to prevent the signal input terminal from being affected by the load, thereby enhancing the capability of the signal to drive the load.
Furthermore, the present invention is not limited to the reference voltage VE1-VEm directly connected to the second resistor string 132, and when there are other auxiliary periods between the reference voltage VE1-VEm and the second resistor string 132, such as buffers or operational amplifiers, the resistance values of the resistors in the second resistor string 132 can be adjusted in different proportions to achieve better display performance.
Fig. 4 is a flowchart illustrating a gamma voltage generating method according to an embodiment of the invention.
As shown in fig. 4, in the present embodiment, the gamma voltage generating method includes performing steps S01 to S03 on the gamma voltage generating circuit shown in fig. 2 and 3.
In step S01, a plurality of reference voltages are provided, and the connection node of each two adjacent resistance units receives the corresponding reference voltage.
In this embodiment, the power circuit 2 divides the voltage according to the first resistor string 22 to generate a plurality of reference voltages VE 1-VEm. The second resistor string 132 of the gamma voltage generating circuit 13 includes a plurality of resistor units connected in series between a power supply terminal (e.g., the reference voltage VE1) and a reference ground terminal (e.g., the reference voltage VEm), and a connection node of every two adjacent resistor units is connected to the output terminal of the power supply circuit 2 to receive the corresponding reference voltages VE 1-VEm.
In step S02, the resistance unit provides at least one level of gamma voltage according to the reference voltage received by the resistance unit and the corresponding proportionality coefficient.
In this embodiment, the second resistor string 132 includes a plurality of resistor units, each of the resistor units includes at least one sub-resistor connected in series between two corresponding connection nodes, the gamma voltages of the corresponding levels output at the connection nodes connected to the output terminal of the power circuit 2 are directly provided by the reference voltages received by the sub-resistors, and the gamma voltages of the other levels are generated by dividing the difference between the reference voltages received by the two ends of the corresponding resistor units by the sub-resistors in the resistor units.
Furthermore, any one of the resistor units is correspondingly provided with a proportionality coefficient, and the proportionality coefficient is used for improving the resistance values of the plurality of sub-resistors in the resistor unit when the reference voltage is divided, so that the current in the circuit is reduced, and the energy consumption is reduced. And the resistance unit outputs at least one level of gamma voltage according to the corresponding proportionality coefficient.
Further, in the resistor unit, the resistance value of each sub-resistor is equal to the product of the initial resistance value of the sub-resistor and the corresponding proportionality coefficient of the resistor unit.
Optionally, in a preferred embodiment of the present invention, the plurality of reference voltages may be buffered by a buffer or an operational amplifier, and then the buffered reference voltages are input to the corresponding connection nodes to isolate the signal input terminal from the signal output terminal, so as to prevent the signal input terminal from being affected by the load, so as to enhance the capability of the signal driving the load.
In step S03, the proportionality coefficients of the respective resistance units are set, respectively, so that the gamma voltages of the respective stages are adjusted.
In this embodiment, by setting the proportional coefficient corresponding to the resistor units, the flexible adjustment of different resistance values in the second resistor string 132 can be realized while the circuit current is reduced, the problem that a plurality of resistor units cannot achieve a high degree of adaptation under the same adjustment ratio is avoided, and the display performance of the display panel is improved.
Further, the step of adjusting the gamma voltages of the respective stages includes: and adjusting the resistance value of the corresponding resistance unit according to the corresponding proportionality coefficient.
Preferably, the proportionality coefficients of different resistance units may be the same or different, but the proportionality coefficients of the plurality of sub-resistances in one resistance unit are the same.
Further, the plurality of resistance units are implemented by conductor traces connected between the power supply terminal and the reference ground terminal. In a preferred embodiment of the present invention, the positions of the connection nodes on the conductor traces may be adjusted according to the required scaling factors to adjust the lengths of the portions of the conductor traces corresponding to the resistor units, respectively, so as to achieve scaling of the resistance values of the plurality of resistors in the second resistor string 132.
In other embodiments of the present invention, the resistance values of the resistors in the resistor string may be adjusted in different proportions by other methods, such as using an adjustable resistor, connecting resistors with corresponding resistance values in series between different output nodes, or adding a selection switch, and controlling the selection switch to select the resistance value of the resistor according to the corresponding adjustment proportion for output according to the corresponding selection signal. It is understood that all the resistor values in the resistor string are adjusted in different proportions within the protection scope of the present invention.
Further, the invention also discloses a driving chip, which comprises the source driving circuit 3 in fig. 1.
The gamma voltage generating circuit disclosed by the invention enables the gamma curve of the driving chip to meet the requirements of customers, and simultaneously, the corresponding gamma current in the chip can be further reduced, so that better collocation among other key factors such as energy consumption, state conversion speed, area and the like is realized.
It should be noted that, in this document, the contained terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (14)
1. A control method of a gamma voltage generating circuit including a plurality of resistance units connected in series, the plurality of resistance units being formed by conductor wirings connected between a power supply terminal and a ground reference terminal, and the plurality of resistance units each including a plurality of sub-resistances, the control method comprising:
providing a plurality of reference voltages, wherein the connection nodes of every two adjacent resistance units in the plurality of resistance units receive the corresponding reference voltages;
the plurality of resistance units provide at least one level of gamma voltage according to the reference voltage received by the plurality of resistance units and the proportionality coefficients of the plurality of sub-resistances; and
the lengths of corresponding partial conductor wires are adjusted by adjusting the positions of the connection nodes of the plurality of resistance units on the conductor wires, and the proportionality coefficients of the plurality of resistance units are set but the proportionality coefficients of the plurality of sub-resistances are the same, so that the currents in the plurality of resistance unit circuits are adjusted.
2. The control method according to claim 1, wherein the proportionality coefficients of different resistance units are the same or different.
3. The method of claim 1, wherein the step of adjusting the gamma voltages of the respective stages comprises:
and adjusting the resistance value of the corresponding resistance unit according to the proportionality coefficient.
4. The control method according to claim 3, wherein in the resistor unit, the resistance value of each of the sub-resistors is equal to a product of an initial resistance value of the sub-resistor and the scaling factor corresponding to the resistor unit.
5. The control method according to claim 1,
and buffering the plurality of reference voltages, wherein the connection node of every two adjacent resistance units receives the corresponding buffered reference voltages.
6. A gamma voltage generation circuit, comprising:
a plurality of resistance units connected in series, connection nodes of every two adjacent resistance units in the plurality of resistance units receive corresponding reference voltages, and the plurality of resistance units provide at least one level of gamma voltage according to the reference voltages received by the resistance units; and
a control circuit for adjusting the current in the plurality of resistance unit circuits according to the corresponding proportionality coefficients of the plurality of resistance units,
the resistance units are formed by conductor wires connected between a power supply end and a reference grounding end, each resistance unit comprises a plurality of sub-resistors, and the proportional coefficients of the resistance units are set by adjusting the positions of the connection nodes of the resistance units on the conductor wires so as to adjust the lengths of corresponding partial conductor wires, but the proportional coefficients of the sub-resistors are the same.
7. The control method of a gamma voltage generating circuit according to claim 6,
the reference voltage is provided by a power supply circuit.
8. The gamma voltage generation circuit of claim 6, wherein the scaling coefficients of different ones of the resistor units are the same or different.
9. The gamma voltage generating circuit of claim 6, wherein in the resistor units, the resistance of each of the sub-resistors is equal to the product of the initial resistance of the sub-resistor and the scaling factor corresponding to the resistor unit.
10. The gamma voltage generation circuit of claim 6, further comprising:
the buffers are used for receiving reference voltage, buffering the reference voltage and outputting the buffered reference voltage to the resistor units.
11. A source driver circuit, comprising:
the gamma voltage generation circuit of any one of claims 6 to 10, the gamma voltage generation circuit to generate a plurality of gamma voltages according to a plurality of reference voltages;
the data register receives and stores gray scale data of the display pixels;
a latch connected to the data register, latching the gray scale data in response to a strobe signal, and outputting the latched gray scale data;
the level shifter is connected with the latch and is used for performing level conversion on the gray scale data and outputting the gray scale data;
the digital-to-analog converter is respectively connected with the gamma voltage generating circuit and the level converter and outputs one of the gamma voltages according to the gray scale data;
and the input end of the output circuit is connected with the digital-to-analog converter, and the output end of the output circuit is connected with the data line, receives the gamma voltage and drives the data line to a driving voltage corresponding to the gamma voltage.
12. A driver chip, wherein the source driver circuit of claim 11 is integrated on the driver chip.
13. A display device, comprising:
the display panel comprises a plurality of data lines, a plurality of scanning lines and a plurality of pixels;
the grid driving circuit is connected with the plurality of scanning lines of the display panel and used for sequentially driving the plurality of scanning lines of the display panel; and
the source driver circuit as claimed in claim 11, connected to the plurality of data lines of the display panel, for driving the plurality of data lines of the display panel according to gray scale data of a display pixel level; and
and the power supply circuit is connected with the source driving circuit and is used for generating a plurality of reference voltages.
14. The display device according to claim 13, wherein the display panel comprises: a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, a Mini-LED display panel, a field emission display panel, a plasma display panel, an electrophoresis display panel, or an electrowetting display panel.
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| CN201910539141.3A CN110379396B (en) | 2019-06-17 | 2019-06-17 | Gamma voltage generation method, generation circuit, source electrode driving circuit, driving chip and display device |
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| CN201910539141.3A CN110379396B (en) | 2019-06-17 | 2019-06-17 | Gamma voltage generation method, generation circuit, source electrode driving circuit, driving chip and display device |
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| CN110379396A CN110379396A (en) | 2019-10-25 |
| CN110379396B true CN110379396B (en) | 2022-03-25 |
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| CN111785200A (en) * | 2020-06-02 | 2020-10-16 | 中国电子科技集团公司第五十五研究所 | Gamma correction method of active Micro-LED display screen |
| CN113470586B (en) * | 2021-05-31 | 2022-03-22 | 惠科股份有限公司 | Driving circuit, driving method and debugging method of display panel |
| CN113963664B (en) * | 2021-10-22 | 2022-12-09 | 晟合微电子(肇庆)有限公司 | Display method based on cascade drive chip, display and readable storage medium |
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