CN116825042B - Gamma voltage adjusting method, gamma voltage adjusting circuit and display device - Google Patents
Gamma voltage adjusting method, gamma voltage adjusting circuit and display device Download PDFInfo
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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
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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
- G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
- G09G5/39—Control of the bit-mapped memory
- G09G5/393—Arrangements for updating the contents of the bit-mapped memory
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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
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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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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Abstract
The application relates to a gamma voltage regulating method, a gamma voltage regulating circuit and a display device, wherein the method comprises the following steps: acquiring a refresh rate of a current frame; acquiring a target set value matched with the refresh rate of the current frame from a preset storage table according to the refresh rate of the current frame, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of the next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of a gray scale circuit; and transmitting the target set value to the gray scale circuit so that the gray scale circuit adjusts the gamma voltage according to the target set value, outputting target gamma voltage which is used for compensating the display brightness of the next frame. In this way, the target set value matched with the refresh rate of the current frame can be obtained from the preset storage table, and then the gamma voltage corresponding to the target gray level of the next frame is adjusted, so that the problem of flickering caused by larger brightness difference when the refresh rate changes greatly is avoided.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a gamma voltage adjustment method, a gamma voltage adjustment circuit, and a display device.
Background
The display frequency conversion technology (i.e. Freesync technology) is a technology for realizing dynamic refresh rate by utilizing industry standards such as adaptive synchronization of display ports. The dynamic refresh rate is widely used in the display technology field by synchronizing the refresh rate of a compatible display with the frame rate of a user's graphics card, minimizing input delay, and reducing or completely eliminating the occurrence of card drag during game play and video play.
However, since the display frequency conversion technology changes the refresh rate by changing the vertical blanking period of each frame, that is, the vertical blanking period of each frame is different at different refresh rates, when the refresh rate is changed greatly, the difference of the vertical blanking periods is large, which easily causes a problem that the display brightness is different greatly and flicker occurs.
Therefore, how to realize the stability of display brightness while ensuring the dynamic refresh rate becomes a technical problem to be solved.
Disclosure of Invention
The application provides a gamma voltage regulating method, a gamma voltage regulating circuit and a display device, which are used for solving the problem that in the prior art, when the refresh rate is changed greatly, the display brightness difference is easy to be larger and flicker occurs.
In a first aspect, an embodiment of the present application provides a gamma voltage adjustment method applied to a timing control circuit, where the timing control circuit is connected to a gray scale circuit, the method including:
acquiring a refresh rate of a current frame;
Acquiring a target set value matched with the refresh rate of the current frame from a preset storage table according to the refresh rate of the current frame, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of a next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of the gray scale circuit;
And transmitting the target set value to the gray scale circuit so that the gray scale circuit adjusts gamma voltage according to the target set value to output target gamma voltage, wherein the target gamma voltage is used for compensating the display brightness of the next frame.
Optionally, the gray scale circuit includes a reference voltage generation sub-circuit and a gamma voltage generation sub-circuit; the target set values comprise a first set value and a second set value, wherein the first set value is used for adjusting the reference voltage output by the reference voltage generation sub-circuit, the second set value is used for adjusting the gamma voltage output by the gamma voltage generation sub-circuit, and the first set value and the second set value are determined by the target adjustment quantity.
Optionally, the transmitting the target set value to the gray scale circuit includes:
and respectively carrying the first type of set values and the second type of set values in different control commands and sending the different control commands to the gray scale circuit.
Optionally, before the transmitting the target set value to the gray scale circuit, the method further includes:
Sending a first command to the gray scale circuit, wherein the first command is used for controlling the gray scale circuit to enable output to be closed, and the output of the gray scale circuit is in a high-resistance state under the condition that the gray scale circuit enables output to be closed;
after said transmitting said target set point to said gray scale circuit, said method further comprises:
and sending a second command to the gray scale circuit, wherein the second command is used for controlling the gray scale circuit to enable output to be started, and the gray scale circuit outputs the target gamma voltage under the condition that the gray scale circuit enables output to be started.
Optionally, the gray-scale circuit further includes a first register and a second register, where only one of the first register and the second register takes effect at the same time, the first register is used to store a target set value corresponding to a previous frame, and the second register is used to store a target set value corresponding to a current frame;
the method further comprises, prior to said transmitting the target setting to the gray scale circuit:
Transmitting a third command to the gray scale circuit, wherein the third command is used for controlling the second register to fail, and the gray scale circuit outputs gamma voltage according to the first register under the condition that the second register fails;
after said transmitting said target set point to said gray scale circuit, said method further comprises:
And sending a fourth command to the gray scale circuit, wherein the fourth command is used for controlling the second register to take effect, and the gray scale circuit outputs gamma voltage according to the second register under the condition that the second register takes effect.
Optionally, the target gray scale is a gray scale located at a middle position between the positive gray scale and the negative gray scale in the gray scale circuit.
Optionally, before the target set value matched with the refresh rate of the current frame is obtained from a preset storage table according to the refresh rate of the current frame, the method further includes:
And obtaining target set values corresponding to the refresh rates, and storing the target set values corresponding to the refresh rates in the preset storage table, wherein the target set values are obtained by calculation according to preset parameter values of the gray scale circuit and target adjustment amounts corresponding to the refresh rates.
Optionally, the acquiring the refresh rate of the current frame includes:
acquiring the vertical blanking time length of a current frame;
and determining the refresh rate of the current frame according to the vertical blanking time length of the current frame.
In a second aspect, an embodiment of the present application further provides a gamma voltage adjustment circuit, including a gray scale circuit and the timing control circuit according to any one of the first aspects;
The time sequence control circuit is used for acquiring the refresh rate of the current frame; acquiring a target set value matched with the refresh rate of the current frame from a preset storage table according to the refresh rate of the current frame, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of a next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of the gray scale circuit; transmitting the target set value to the gray scale circuit;
The gray scale circuit is used for adjusting the gamma voltage according to the target set value and outputting a target gamma voltage, and the target gamma voltage is used for compensating the display brightness of the next frame.
In a third aspect, embodiments of the present application further provide a display device including a display panel and the gamma voltage adjusting circuit according to the second aspect.
In the embodiment of the application, the refresh rate of the current frame is obtained; acquiring a target set value matched with the refresh rate of the current frame from a preset storage table according to the refresh rate of the current frame, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of a next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of the gray scale circuit; and transmitting the target set value to the gray scale circuit so that the gray scale circuit adjusts gamma voltage according to the target set value to output target gamma voltage, wherein the target gamma voltage is used for compensating the display brightness of the next frame. In this way, the target set value matched with the refresh rate of the current frame can be obtained from the preset storage table according to the refresh rate of the current frame, and then the gamma voltage corresponding to the target gray level of the next frame is adjusted, so that the problem of flickering caused by larger brightness difference when the refresh rate changes greatly is avoided. In addition, the target adjustment amount for adjusting the gamma voltage each time can be smaller than the default unit adjustment amount of the gray scale circuit, so that finer adjustment can be realized, and the stability of the brightness is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a gamma voltage adjusting method according to an embodiment of the application;
Fig. 2 is a schematic structural diagram of a display panel driving circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a gray scale circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a measurement result of an optical instrument according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another measurement result of an optical instrument according to an embodiment of the present application;
fig. 6 is a schematic diagram of a gamma voltage adjusting circuit according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a flow chart of a gamma voltage adjusting method according to an embodiment of the application. As shown in fig. 1, the gamma voltage adjusting method is applied to a time sequence control circuit, the time sequence control circuit is connected with a gray scale circuit, and the method comprises the following steps:
Step 101, obtaining the refresh rate of the current frame.
It should be noted that, the Gamma voltage adjustment method provided in the embodiment of the present application may be applied to a timing Control circuit (TCON for short), where the timing Control circuit may be connected to a gray scale circuit (may also be referred to as a Gamma circuit or a Gamma circuit), the timing Control circuit may transmit a binary command to the gray scale circuit through an I2C bus, the gray scale circuit may adjust a Gamma voltage according to the received binary command, and output the Gamma voltage to a driving circuit after performing digital-to-analog conversion, where the number of Gamma voltages may be 14 groups, 16 groups, or 18 groups, and may be specifically set according to actual requirements. For example, in the display panel driving circuit shown in fig. 2, the power supply circuit provides the voltage gradation control voltage VAA to the gray scale circuit, the gray scale circuit generates 14 groups of gamma voltages to the driving circuit, the driving circuit can automatically divide voltage to generate 256 x2 (256 positive gray scales and 256 negative gray scales) gray scale voltages through the resistor string after receiving the 14 groups of gamma voltages, and then the Data voltage is output to the display panel according to the POL signal and the Data signal sent by the timing control circuit, so that the display panel can control the liquid crystal inversion of each pixel according to the Data voltage and the screen common electrode voltage to provide brightness required by the picture display.
In the step, the time sequence control circuit can directly acquire the refresh rate of the current frame from the original driving data by acquiring the original driving data of the current frame; the refresh rate of the current frame may also be determined by obtaining the vertical blanking period v_blank of the current frame and then according to the vertical blanking period v_blank of the current frame, which is not particularly limited in the embodiment of the present application.
It should be noted that, a frame of the display panel is divided into an Active area of display time and a Blank area of pause time before entering the next frame, assuming that a full-high definition (Full High Definition, abbreviated as FHD) display panel is taken as an example, its resolution is 1920 x 1080, when the refresh rate is 240Hz, a frame needs to scan and charge 1080 lines in Total, the 1080 line charging time is the Active area, then the 45 lines are stopped, the 45 line charging time is the Blank area, and the line number of a frame, i.e. v_total, is 1080+45=1125; when the refresh rate is 120Hz, the Blank area needs to be increased by 1125 lines, so that the number of lines of one frame, i.e., v_total, becomes 1080+45+1125=2250, which is exactly twice 1125. It can be seen that the Freesync technique is to change the refresh rate by changing the vertical blanking period V _ Blank (i.e., the number of Blank zone time lines). Since the Liquid crystal display panel (LCD) maintains brightness by maintaining a voltage difference between both sides of the Liquid crystal after scanning and charging, but the vertical blanking period (leakage period) has a large difference between the two refresh rates, a change in brightness perceived by naked eyes occurs when the Liquid crystal display panel is switched between the two refresh rates.
Step 102, according to the refresh rate of the current frame, obtaining a target set value matched with the refresh rate of the current frame from a preset storage table, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of the next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of a gray scale circuit.
Specifically, the preset storage table is a storage table preset by the user. The preset storage table stores corresponding target set values under each refresh rate, wherein the target set values are calculated by a user according to preset parameter values of the gray scale circuit and target adjustment amounts corresponding to the refresh rates, and the preset parameter values can include, but are not limited to, parameter values such as a reference voltage setting range, a reference voltage output range, a reference voltage precision value, gray scale number, a gray scale setting range and the like, and the target adjustment amounts are empirical values obtained by measuring through an optical instrument.
Step 103, transmitting the target set value to the gray scale circuit, so that the gray scale circuit adjusts the gamma voltage according to the target set value, and outputs a target gamma voltage, wherein the target gamma voltage is used for compensating the display brightness of the next frame.
The timing control circuit may transmit the target set value to the gray scale circuit after acquiring the target set value matched with the refresh rate of the current frame, so that the gray scale circuit may adjust the gamma voltage according to the target set value and output the target gamma voltage.
In this embodiment, in this way, according to the refresh rate of the current frame, the target set value matched with the refresh rate of the current frame may be obtained from the preset storage table, so as to adjust the gamma voltage corresponding to the target gray level of the next frame, thereby avoiding the problem of flicker caused by large brightness difference when the refresh rate changes greatly. In addition, the target adjustment amount for adjusting the gamma voltage each time can be smaller than the default unit adjustment amount of the gray scale circuit, so that finer adjustment can be realized, and the stability of the brightness is further improved.
Further, the gray scale circuit includes a reference voltage generation sub-circuit and a gamma voltage generation sub-circuit; the target set values comprise a first type set value and a second type set value, wherein the first type set value is used for adjusting the reference voltage output by the reference voltage generation sub-circuit, the second type set value is used for adjusting the gamma voltage output by the gamma voltage generation sub-circuit, and the first type set value and the second type set value are determined by the target adjustment quantity.
In an embodiment, the gray scale circuit may include a reference voltage generating sub-circuit and a gamma voltage generating sub-circuit, as shown in fig. 3, wherein the reference voltage generating sub-circuit is configured to generate a reference voltage Vref according to a voltage gradation control voltage VAA, the gamma voltage generating sub-circuit is configured to generate multiple groups of gamma voltages according to the reference voltage Vref, and the magnitudes of the multiple groups of gamma voltages are (set value/1023) Vref, where 1023 is determined according to a setting range (10 bits) of the gamma voltage generating sub-circuit. Of course, in other embodiments, other setting ranges, such as 8 bits, may be used, and the embodiments of the present application are not limited specifically.
For example, assume that a preset parameter value and a default first type of setting value of a reference voltage generating sub-circuit of a certain gray scale circuit are as follows in table 1:
TABLE 1
The preset parameter values and default second class set values of the gamma voltage generation sub-circuit are as follows in table 2:
| Gamma binding point | Gray scale | Second kind of set value | Gamma voltage value |
| G1 | 255 | 980 | 13.37246468 |
| G2 | 254 | 972 | 13.26330171 |
| G3 | 223 | 833 | 11.36659498 |
| G4 | 127 | 770 | 10.50693654 |
| G5 | 31 | 690 | 9.41530677 |
| G6 | 1 | 590 | 8.05076956 |
| G7 | 0 | 581 | 7.92796121 |
| G8 | 0 | 424 | 5.78563778 |
| G9 | 1 | 416 | 5.67647480 |
| G10 | 31 | 290 | 3.95715792 |
| G11 | 127 | 240 | 3.27488931 |
| G12 | 223 | 145 | 1.97857896 |
| G13 | 254 | 26 | 0.35477968 |
| G14 | 255 | 20 | 0.27290744 |
TABLE 2
As can be seen from tables 1 and 2, the reference voltage setting range of the reference voltage generating sub-circuit is 0 to 255 (i.e., 8 bits), the reference voltage output range is 6V-17.8V, so the reference voltage precision value is (17.8-6)/255= 0.04627451V, since the default first type setting value is 172, the output reference voltage is 6+0.046275551×172= 13.95921569, and the gamma voltage precision value is 13.95921569/1023= 0.013645372. The voltage gradation control voltage VAA is provided by the power circuit, and GM1 is the gamma voltage corresponding to the highest gray level required by the display panel, so the reference voltage Vref needs to be set between the voltage gradation control voltage VAA and the gamma voltage GM 1. In the gamma voltage generation sub-circuit, GM1 and GM14 are 255 gray scales, GM2 and GM13 are 254 gray scales, GM3 and GM12 are 223 gray scales, GM4 and GM11 are 127 gray scales, GM5 and GM10 are 31 gray scales, GM6 and GM9 are 1 gray scale, and GM7 and GM8 are 0 gray scale, wherein the high voltage GM is a positive gray scale, and the low voltage GM is a negative gray scale. The magnitude of the gamma voltage corresponding to each gray level is the second class set value corresponding to each gray level.
In the related art, brightness is usually compensated by directly adding or subtracting a set value (i.e., a second set value) to one of positive gray level and negative gray level of 127 gray levels, so that only one Step of the positive gray level or the negative gray level (i.e., a default unit adjustment amount of a gray level circuit) can be adjusted, and the difference between the positive gray level or the negative gray level is one Step, which has small variation, but is already the adjustment of the minimum gamma voltage. It was found by optical instrument measurements that there was still some fluctuation of the switching node at different refresh rates that could be perceived by the human eye, as shown in fig. 4.
In this embodiment, the first type of setting values may be modified in addition to the second type of setting values. For convenience of explanation, explanation will be continued based on the above examples. For example, when the first type of setting value is adjusted to two steps from 172 to 174, the output reference voltage is 6+0.04627951×174= 14.05176471, and the gamma voltage precision value is 14.05176471/1023= 0.01373584. At this time, without changing the second type of set values, there is a change in the gamma voltages corresponding to the respective gray scales as shown in the following tables 3 and 4:
TABLE 3 Table 3
TABLE 4 Table 4
The voltage difference exists between the reference voltage Vref and the gamma voltages corresponding to the gray scales before and after Step, and the voltage difference is a multiple of the GM precision value as shown in Table 4. At this time, modification of the second class setting value may be added, the integer part in the multiple is removed, and the fractional part is reserved, so that the target adjustment amount of the gamma voltage corresponding to the target gray level is smaller than the default unit adjustment amount of the gray level circuit, and the gamma voltages corresponding to the gray levels after the modification of the second class setting value are as follows in table 5:
TABLE 5
Since the positive gray level voltage rises and becomes bright and the negative gray level voltage rises and becomes dark, the positive gray level voltage minus the negative gray level voltage is the brightness variation, whereby the brightness variation of the target gray level can be obtained as shown in table 6:
TABLE 6
When the gamma voltages are adjusted according to the second type of set values in table 5, the voltage variation shown in table 6 can be obtained. The measurement by an optical instrument shows that the smoothness of the brightness curve is greatly improved, and the flicker caused by GM switching at the switching nodes with different refresh rates is invisible to naked eyes, as shown in FIG. 5.
In this embodiment, the second type of setting values are modified at the same time, and the first type of setting values are modified, so that the adjustment amount of the gamma voltage can be smaller than the default unit adjustment amount of the gray scale circuit by adjusting the first type of setting values and the second type of setting values together, thereby realizing finer brightness compensation.
Further, the step 103 of transmitting the target set value to the gray scale circuit specifically includes:
And respectively carrying the first type of set values and the second type of set values in different control commands and sending the different control commands to the gray scale circuit.
In an embodiment, the timing control circuit may send the first type of setting value and the second type of setting value to the gray scale circuit respectively in different control commands. Specifically, the timing control circuit may send a control command carrying a first type of setting value to the gray scale circuit, and then send a control command carrying a second type of setting value to the gray scale circuit; or the control command carrying the second type of set value may be sent to the gray scale circuit first, and then the control command carrying the first type of set value may be sent to the gray scale circuit. Therefore, the gray scale circuit can conveniently distinguish the received set values, and the set values in the corresponding sub-circuits can be accurately adjusted.
Further, before the step 103 of transmitting the target set value to the gray scale circuit, the method further includes:
Transmitting a first command to the gray scale circuit, wherein the first command is used for controlling the gray scale circuit to enable output to be closed, and the output of the gray scale circuit is in a high resistance state under the condition that the gray scale circuit enables output to be closed;
After the step 103 of transmitting the target setting value to the gray scale circuit, the method further includes:
and sending a second command to the gray scale circuit, wherein the second command is used for controlling the gray scale circuit to enable the output to be started, and outputting the target gamma voltage of the gray scale circuit under the condition that the gray scale circuit enables the output to be started.
In an embodiment, since the first type of setting value and the second type of setting value are respectively carried in different control commands and sent to the gray scale circuit, in order to avoid the problem that the gamma voltage corresponding to each gray scale close to GM1 gray scale is erroneously effective because the gray scale circuit does not timely receive and adjust the second type of setting value after receiving and adjusting the first type of setting value, the timing control circuit may send the first command to the gray scale circuit before starting to transmit the target setting value to the gray scale circuit, so that the gray scale circuit enables output to be turned off, and at this moment, the output of the gray scale circuit is in a high resistance state, but the capacitor on the circuit still maintains the original voltage value after the gamma voltage is output because the gamma voltage is a reference voltage to the driving circuit, the pumping load is extremely small, and the capacitor is sufficient to maintain the original voltage value unchanged. When the target set values are all received by the gray scale circuit, the time sequence control circuit can send a second command to the gray scale circuit, so that the gray scale circuit enables output to be started, and the gray scale circuit normally outputs target gamma voltages corresponding to the target set values. By the method, the problem that gamma voltages corresponding to gray scales close to GM1 gray scales are wrongly effective due to the fact that the gray scale circuit does not receive and adjust the second type of set values in time after receiving and adjusting the first type of set values can be avoided, and therefore stability of display brightness is improved.
As another embodiment, the gray-scale circuit further includes a first register and a second register, where only one of the first register and the second register is effective at the same time, the first register is used for storing a target set value corresponding to a previous frame, and the second register is used for storing a target set value corresponding to a current frame;
before the step 103 of transmitting the target set value to the gray scale circuit, the method further includes:
Transmitting a third command to the gray scale circuit, wherein the third command is used for controlling the second register to fail, and the gray scale circuit outputs gamma voltages according to the first register under the condition that the second register fails;
After the step 103 of transmitting the target setting value to the gray scale circuit, the method further includes:
and sending a fourth command to the gray scale circuit, wherein the fourth command is used for controlling the second register to be effective, and the gray scale circuit outputs gamma voltages according to the second register under the condition that the second register is effective.
In an embodiment, a register may be additionally added in the gray scale circuit to solve the problem that the gray scale circuit does not receive and adjust the second type of set value in time after receiving and adjusting the first type of set value, resulting in the wrong effect of the gamma voltage corresponding to each gray scale close to the GM1 gray scale. Specifically, the original register and the added register of the gray scale circuit can be used as the first register and the second register respectively, and the effective time of the two registers can be switched through the time sequence control circuit. Before the time sequence control circuit starts to transmit a target set value to the gray scale circuit, a third command is sent to the gray scale circuit, so that the second register is disabled, and the second register allows the gray scale circuit to modify the target set value but does not allow the gray scale circuit to output gamma voltage according to the target set value; meanwhile, the first register is in an effective state, and the gray scale circuit is not allowed to modify the target set value therein, but is allowed to output the gamma voltage of the previous frame according to the target set value therein. After the target set values are completely received by the gray scale circuit and written into the second register, the time sequence control circuit can send a fourth command to the gray scale circuit, so that the second register is in an effective state, the gray scale circuit is not allowed to modify the target set values, but the gray scale circuit is allowed to output the gamma voltage of the current frame according to the target set values; at the same time, the first register fails, and at this time, the first register allows the gray scale circuit to modify the target set value therein, but does not allow the gray scale circuit to output the gamma voltage according to the target set value therein. By the method, the problem that gamma voltages corresponding to gray scales close to GM1 gray scales are wrongly effective due to the fact that the gray scale circuit does not receive and adjust the second type of set values in time after receiving and adjusting the first type of set values can be avoided, and therefore stability of display brightness is improved.
Further, the target gray scale is a gray scale located at a middle position between the positive gray scale and the negative gray scale in the gray scale circuit.
In one embodiment, when the target setting value is set, the target adjustment amount of the target gray scale is mainly used, and the target gray scale is a gray scale located at a middle position between the positive gray scale and the negative gray scale in the gray scale circuit. For example, for GM1, GM2, GM3, GM6, GM7, GM8, GM9, GM12, GM13, GM14 in the 14 groups of gray scales in the above example, since the change of the reference voltage Vref is the change of the reference voltages of all gamma voltages, these gamma voltage compensation offsets are caused, and after the gamma voltages are revised, these gamma voltages can be changed by at most 0.5Step, however, the gray scales corresponding to these gamma voltages are either too high or too low, and the voltage compensation offset of 0.5Step is not perceived at all by human eyes, so they do not need refinement accuracy; while GM4, GM5, GM10, GM11 correspond to gray scales 127 and 31, fluctuation is easily perceived by human eyes, so 127 gray scales and 31 gray scales are taken as target gray scales.
Of course, when the number of gamma voltages is other, the gray scale located at the intermediate position between the positive gray scale and the negative gray scale may be found as the target gray scale. For example, for 16 sets of gray scales, 127 gray scales, 64 gray scales, and 31 gray scales may be regarded as target gray scales, or the like.
In this embodiment, the gray scale near the middle position in the positive gray scale and the negative gray scale in the gray scale circuit is used as the target gray scale, and the target setting value is set by taking the target adjustment amount of the target gray scale as the main part, so that the problem of flicker can be solved, and the setting efficiency of the target setting value can be improved.
Further, before the target set value matched with the refresh rate of the current frame is obtained from the preset storage table according to the refresh rate of the current frame, the method further comprises:
And obtaining target set values corresponding to the refresh rates, and storing the target set values corresponding to the refresh rates in a preset storage table, wherein the target set values are calculated according to preset parameter values of the gray scale circuit and target adjustment amounts corresponding to the refresh rates.
In an embodiment, before the timing control circuit obtains, according to the refresh rate of the current frame, the target set value matched with the refresh rate of the current frame from the preset storage table, the user is further required to store the preset storage table in the timing control circuit in advance, where the preset storage table stores the target set values corresponding to the refresh rates, and can compensate for the brightness corresponding to the refresh rates. After the target set values corresponding to the refresh rates are obtained by the measurement of the optical instrument, the user sets the first set value of the reference voltage generating sub-circuit and the second set value of the gamma voltage generating sub-circuit, so that the adjustment amount of the gamma voltage corresponding to the target gray scale meets the target set value. Thus, the flicker problem caused by the gamma voltage switching when the refresh rate is changed can be thoroughly eliminated by fine compensation.
Further, the step 101 of obtaining the refresh rate of the current frame includes:
acquiring the vertical blanking time length of a current frame;
and determining the refresh rate of the current frame according to the vertical blanking time length of the current frame.
In an embodiment, when the timing control circuit obtains the refresh rate of the current frame, the refresh rate of the current frame may be determined by obtaining the vertical blanking period of the current frame and then according to the vertical blanking period of the current frame. The vertical blanking period herein refers to a period of time during which a new frame is scanned from the lower right corner of the image to the upper left corner of the image after the scanning point scans the frame. A frame of the display panel is divided into an Active area of display time and a Blank area of pause time before entering the next frame, and assuming that a full high definition (Full High Definition, abbreviated as FHD) display panel is taken as an example, the resolution is 1920 x 1080, when the refresh rate is 240Hz, a frame needs to scan and charge 1080 lines in Total, the 1080 line charging time is the Active area, then 45 lines are stopped, the 45 line charging time is the Blank area, and the line number of a frame, namely v_total, is 1080+45=1125; when the refresh rate is 120Hz, 1125 rows are added to the Blank area, so that the number of rows of one frame, i.e., V_Total, becomes
1080+45+1125=2250, Exactly twice as much as 1125. Therefore, the refresh rate is different, the corresponding vertical blanking time is different, and the time sequence control circuit can determine the refresh rate of the current frame according to the acquired vertical blanking time of the current frame.
Referring to fig. 6, the embodiment of the present application further provides a gamma voltage adjusting circuit 600, which includes a gray scale circuit 601 and the timing control circuit 602 described above;
The timing control circuit 602 is configured to obtain a refresh rate of a current frame; according to the refresh rate of the current frame, a target set value matched with the refresh rate of the current frame is obtained from a preset storage table, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of the next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of a gray scale circuit 601; transmitting the target set value to the gray scale circuit 601;
The gray scale circuit 601 is used for adjusting the gamma voltage according to a target set value, outputting a target gamma voltage, and the target gamma voltage is used for compensating the display brightness of the next frame.
It should be noted that the gamma voltage adjusting circuit 600 can achieve the same functions as the timing control circuit 602, and will not be described in detail herein.
In addition, the embodiment of the application also provides a display device which comprises a display panel and the gamma voltage regulating circuit. The display device can realize the functions of the gamma voltage regulating circuit, achieves the same technical effects and is not described in detail herein.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of embodiments of the present invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A gamma voltage adjustment method applied to a timing control circuit, the timing control circuit being connected to a gray scale circuit, the method comprising:
acquiring a refresh rate of a current frame;
Acquiring a target set value matched with the refresh rate of the current frame from a preset storage table according to the refresh rate of the current frame, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of a next frame according to a target adjustment amount, the target adjustment amount is smaller than a default unit adjustment amount of the gray scale circuit, and the gray scale circuit comprises a reference voltage generation sub-circuit and a gamma voltage generation sub-circuit; the target set values comprise a first set value and a second set value, wherein the first set value is used for adjusting the reference voltage output by the reference voltage generation sub-circuit, the second set value is used for adjusting the gamma voltage output by the gamma voltage generation sub-circuit, and the first set value and the second set value are determined by the target adjustment quantity;
And transmitting the target set value to the gray scale circuit so that the gray scale circuit adjusts gamma voltage according to the target set value to output target gamma voltage, wherein the target gamma voltage is used for compensating the display brightness of the next frame.
2. The method of claim 1, wherein said transmitting said target setpoint to said gray scale circuit comprises:
and respectively carrying the first type of set values and the second type of set values in different control commands and sending the different control commands to the gray scale circuit.
3. The method of claim 1, wherein prior to said transmitting said target setpoint to said gray scale circuit, said method further comprises:
Sending a first command to the gray scale circuit, wherein the first command is used for controlling the gray scale circuit to enable output to be closed, and the output of the gray scale circuit is in a high-resistance state under the condition that the gray scale circuit enables output to be closed;
after said transmitting said target set point to said gray scale circuit, said method further comprises:
and sending a second command to the gray scale circuit, wherein the second command is used for controlling the gray scale circuit to enable output to be started, and the gray scale circuit outputs the target gamma voltage under the condition that the gray scale circuit enables output to be started.
4. The method of claim 1, wherein the gray scale circuit further comprises a first register and a second register, wherein only one of the first register and the second register is in effect at the same time, the first register is used for storing a target set value corresponding to a previous frame, and the second register is used for storing a target set value corresponding to a current frame;
the method further comprises, prior to said transmitting the target setting to the gray scale circuit:
Transmitting a third command to the gray scale circuit, wherein the third command is used for controlling the second register to fail, and the gray scale circuit outputs gamma voltage according to the first register under the condition that the second register fails;
after said transmitting said target set point to said gray scale circuit, said method further comprises:
And sending a fourth command to the gray scale circuit, wherein the fourth command is used for controlling the second register to take effect, and the gray scale circuit outputs gamma voltage according to the second register under the condition that the second register takes effect.
5. The method of claim 1, wherein the target gray level is a gray level in the gray level circuit that is intermediate between a positive gray level and a negative gray level.
6. The method of claim 1, wherein before the target set value matching the refresh rate of the current frame is obtained from a preset memory table according to the refresh rate of the current frame, the method further comprises:
And obtaining target set values corresponding to the refresh rates, and storing the target set values corresponding to the refresh rates in the preset storage table, wherein the target set values are obtained by calculation according to preset parameter values of the gray scale circuit and target adjustment amounts corresponding to the refresh rates.
7. The method of claim 1, wherein the obtaining the refresh rate of the current frame comprises:
acquiring the vertical blanking time length of a current frame;
and determining the refresh rate of the current frame according to the vertical blanking time length of the current frame.
8. A gamma voltage adjusting circuit, comprising a gray scale circuit and the timing control circuit according to any one of claims 1 to 7, wherein the gray scale circuit comprises a reference voltage generating sub-circuit and a gamma voltage generating sub-circuit;
The time sequence control circuit is used for acquiring the refresh rate of the current frame; acquiring a target set value matched with the refresh rate of the current frame from a preset storage table according to the refresh rate of the current frame, wherein the target set value is used for adjusting gamma voltage corresponding to target gray scale of a next frame according to a target adjustment amount, and the target adjustment amount is smaller than a default unit adjustment amount of the gray scale circuit; transmitting the target set values to the gray scale circuit, wherein the target set values comprise a first set value and a second set value, the first set value is used for adjusting the reference voltage output by the reference voltage generation sub-circuit, the second set value is used for adjusting the gamma voltage output by the gamma voltage generation sub-circuit, and the first set value and the second set value are determined by the target adjustment quantity;
The gray scale circuit is used for adjusting the gamma voltage according to the target set value and outputting a target gamma voltage, and the target gamma voltage is used for compensating the display brightness of the next frame.
9. A display device comprising a display panel and the gamma voltage adjusting circuit of claim 8.
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