CN110544460A - Liquid crystal display and dynamic compensation system of common electrode voltage thereof - Google Patents
Liquid crystal display and dynamic compensation system of common electrode voltage thereof Download PDFInfo
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- CN110544460A CN110544460A CN201810520808.0A CN201810520808A CN110544460A CN 110544460 A CN110544460 A CN 110544460A CN 201810520808 A CN201810520808 A CN 201810520808A CN 110544460 A CN110544460 A CN 110544460A
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- common electrode
- electrode voltage
- compensation
- voltage
- liquid crystal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A liquid crystal display includes a display panel; a time schedule controller; the grid driver and the source driver are controlled by the time sequence controller to display images on the display panel; and the table look-up unit is arranged in the time schedule controller and stores the initial common electrode voltage, the target common electrode voltage and corresponding compensation voltages in a plurality of compensation periods. The timing controller generates a common electrode voltage in a corresponding compensation period according to the initial common electrode voltage and the compensation voltage in each compensation period, and performs progressive compensation on the common electrode voltage until a target common electrode voltage is reached.
Description
Technical Field
The present invention relates to a liquid crystal display, and more particularly, to a dynamic compensation method and system for common electrode Voltage (VCOM).
Background
A liquid crystal display is a kind of flat panel display, and displays an image by using a light-modulating characteristic of a liquid crystal. An advanced super dimension switch (ADS) lcd is a novel lcd, which has a wide viewing angle with a large screen and high resolution, and thus is used in a high-order display.
In order to avoid the phenomenon of image sticking caused by the permanent damage of the liquid crystal molecules of the liquid crystal display due to polarization, a polarity inversion (polarity inversion) mechanism is generally used. However, when the polarity inversion is performed, the positive and negative pixel voltages of the common electrode Voltage (VCOM) may not be balanced symmetrically, and a flicker phenomenon may occur. To alleviate flicker, the asymmetry of the positive and negative polarity voltages can be reduced by adjusting the common electrode voltage to improve the comfort of human eyes.
due to the effect of the flexoelectric effect (flexoelectric effect) on the liquid crystal molecules, the flicker in the use of the advanced super-dimensional field switching (ADS) lcd will shift (shift) with time and finally stabilize at a value regardless of the value of the initial common electrode voltage. Fig. 1 shows a flicker shift curve of a liquid crystal display in one hour after turn-on, with the vertical axis representing Flicker Modulation Amplitude (FMA). Each time the lcd is turned on, the flicker is initially large and stabilizes at a value over time.
In order to alleviate the flicker phenomenon of the liquid crystal display, one method is to change the structure of the pixel electrode. However, this method requires consideration of the architecture of the whole system circuit, resulting in high cost. Therefore, a novel mechanism is needed to improve the flicker phenomenon of the lcd at a low cost.
Disclosure of Invention
In view of the foregoing, an objective of the embodiments of the present invention is to provide a method and a system for dynamic compensation of common Voltage (VCOM) for improving flicker phenomenon of a liquid crystal display and avoiding image sticking, so as to improve the comfort of human eyes.
According to an embodiment of the invention, the liquid crystal display comprises a display panel, a time schedule controller, a grid driver, a source driver and a table look-up unit. The gate driver and the source driver are controlled by the timing controller to display an image on the display panel. The table look-up unit is arranged in the time schedule controller and stores initial common electrode voltage, target common electrode voltage and corresponding compensation voltage in a plurality of compensation periods. The timing controller generates a common electrode voltage in a corresponding compensation period according to the initial common electrode voltage and the compensation voltage in each compensation period, and performs progressive compensation on the common electrode voltage until a target common electrode voltage is reached.
According to another embodiment of the present invention, a system for dynamic compensation of common electrode voltage comprises: a first storage unit for storing a target common electrode voltage; a second storage unit for storing an initial common electrode voltage; the first arithmetic unit is used for generating an initial common electrode voltage; a third storage unit for storing the initial common electrode voltage as the current common electrode voltage; a fourth storage unit for storing the compensation voltage during each compensation period; and a second operation unit for generating and outputting the common electrode voltage in the current compensation period according to the compensation voltage in the current compensation period and the current common electrode voltage in the common electrode voltage compensation process. Wherein the second arithmetic unit continuously performs the gradual compensation on the common electrode voltage until the compensation of the common electrode voltage during the last compensation is completed and the target common electrode voltage has been reached.
Drawings
Fig. 1 shows the flicker shift curve of a liquid crystal display within one hour after being turned on.
FIG. 2 is a system diagram of an LCD according to an embodiment of the present invention.
Fig. 3 shows a flowchart of a dynamic compensation method for common electrode Voltage (VCOM) according to an embodiment of the invention.
Fig. 4 shows the final common electrode voltage after a long time for different initial common electrode voltages.
FIG. 5 illustrates the lookup unit of FIG. 2.
fig. 6 illustrates the flicker and common electrode voltage variation curves over time for various compensation methods for common electrode voltage.
Fig. 7 illustrates the compensation step of the common electrode voltage of the present embodiment.
FIG. 8 shows a block diagram of a dynamic compensation system for common electrode voltage of an embodiment of the present invention.
description of the reference symbols
200 liquid crystal display
21 time sequence controller
22 gate driver
23 Source driver
24 display panel
25 programmable gamma circuit
26 table lookup unit
300 dynamic compensation method
31 turn-on time sequence controller/programmable gamma circuit
32 obtain an initial common electrode voltage
33 checking whether it is the final compensation period
34 common electrode Voltage Compensation
35 wait for a preset time
61A common electrode Voltage Curve
61B scintillation curve
62A common electrode Voltage Curve
62B scintillation curve
63A common electrode Voltage Curve
63B scintillation curve
800 dynamic compensation system
81 first memory cell
82 second memory cell
83 first arithmetic unit
84 third memory cell
85 fourth memory cell
86 second arithmetic unit
FMA flicker modulation amplitude
VCOM common electrode voltage
Detailed Description
Fig. 2 shows a system block diagram of a liquid crystal display 200 according to an embodiment of the invention. Fig. 3 is a flowchart of a method 300 for dynamically compensating a common electrode Voltage (VCOM) according to an embodiment of the invention, which can be used to improve a flicker phenomenon of the liquid crystal display 200 and avoid an image sticking situation. The present embodiment may be applied to an advanced super dimension switch (ADS) liquid crystal display, but is not limited thereto.
First, in step 31, the timing controller (Tcon)21 is turned on to start displaying an image. As shown in fig. 2, the timing controller 21 controls a Gate Driver (GD) 22 and a Source Driver (SD) 23 for displaying an image on the display panel 24.
The magnitude of the initial common electrode voltage is not only related to the flicker of the lcd 200, but also determines the magnitude of the final common electrode voltage (also called the optimal common electrode voltage) after a long time (e.g. one hour), and whether the final common electrode voltage can approach the set target common electrode voltage. Fig. 4 shows the final common electrode voltage after a long time for different initial common electrode voltages. As shown in fig. 4, after one hour passes, the final (optimal) common electrode voltages are different from each other and have no fixed relationship with each other.
in this embodiment, the initial common electrode voltage causes the display 200 to flicker slightly (but usually not minimally) at power-on (step 31), and the final common electrode voltage after a long time can approach the set target common electrode voltage. According to one of the features of the present embodiment, a lookup table (LUT) unit 26 is used, which stores an initial common electrode voltage, a target common electrode voltage (usually preset by a customer), and a compensation voltage (to be described below). When the timing controller (Tcon)21 is turned on (step 31), the timing controller 21 obtains an initial common electrode voltage according to the table look-up unit 26 (step 32). FIG. 5 illustrates the lookup table unit 26 of FIG. 2 with the first column storing the initial common electrode voltage. The table lookup unit 26 of the present embodiment may be a storage unit, which can be implemented in the timing controller 21, and therefore the table lookup unit 26 is disposed inside the timing controller 21.
Next, in steps 33-35, the present embodiment performs a gradual compensation on the common electrode voltage. According to another feature of the present embodiment, the progressive compensation performed by the present embodiment belongs to a non-strict change (non-strict changing) compensation, such as a non-strict increase compensation. For non-stringent increase compensation, the common electrode voltage at the previous time is less than or equal to (≦) the common electrode voltage at the later time. Therefore, during some (at least one) compensation period, the common electrode voltage at the later time may be equal to the common electrode voltage at the previous time. In a preferred embodiment, the gradual compensation performed in this embodiment employs a non-equal voltage interval to compensate the common electrode voltage.
Fig. 6 illustrates graphs of flicker and common electrode voltage versus time for various compensation methods for common electrode voltage, wherein the left vertical axis represents Flicker Modulation Amplitude (FMA) and the right vertical axis represents voltage of common electrode Voltage (VCOM). The solid line 61A represents the common electrode voltage profile for this embodiment using non-equal voltage spacings, and the dashed line 61B represents the corresponding flicker profile. The solid line 62A represents the uncompensated common electrode voltage curve (which is a straight line), and the dashed line 62B represents the corresponding flicker curve. The solid line 63A represents the common electrode voltage curve (which is a strictly increasing line) with equal voltage spacing, and the dashed line 63B represents the corresponding flicker curve.
According to the compensation of the common electrode voltage at the non-equal voltage interval (shown by the solid line 61A and the dashed line 61B) in the embodiment, the initial flicker is slight (between the intermediate values of the three methods), the common electrode voltage increases non-strictly and approaches the target common electrode voltage after a long time (for example, 60 minutes), and the flicker decreases gradually and maintains slight flicker. In contrast to the compensation of the common electrode voltage at the equal voltage intervals shown by the solid line 63A and the dashed line 63B, although the initial flicker is minimal, the common electrode voltage strictly increases, but the generated flicker increases during most of the period. As for the solid line 62A and the broken line 62B, the common electrode voltage compensation is not performed, and flicker generated during most of the period is the maximum of the three methods.
as described above, in the present embodiment, since the flicker is gently changed by the compensation of the common electrode voltage with the unequal equal voltage intervals (as shown by the solid line 61A and the broken line 61B), human eyes feel the flicker slightly. In contrast, when compensation is performed by using the common electrode voltage at equal voltage intervals (as shown by the solid line 63A and the dotted line 63B), flicker changes are large, and thus human eyes can feel flicker obviously.
According to another feature of this embodiment, the compensation voltage during each compensation period is sequentially stored using the aforementioned look-up table (LUT) unit 26. In the common electrode voltage compensation process, the timing controller 21 obtains the compensation voltage for each compensation period according to the contents of the lut 26, so as to generate the common electrode voltage for the corresponding compensation period. Fig. 7 illustrates the compensation step size (offset step) of the common electrode voltage of the present embodiment.
Returning to step 33 of FIG. 3, it is checked whether the last compensation period has been reached. If not, step 34 is entered, and the timing controller 21 obtains the compensation voltage during the current compensation period according to the contents of the lut unit 26, so as to compensate the common electrode voltage. Next, after waiting for a preset time, the next compensation period is entered in step 35. Go back to step 33 to check if the final compensation period has been reached. And repeating the steps 33-35 until the compensation of the common electrode voltage in the last compensation period is completed and the target common electrode voltage is reached, and ending the compensation of the common electrode voltage.
FIG. 8 shows a block diagram of a dynamic compensation system 800 for common electrode Voltage (VCOM) according to an embodiment of the invention. In the present embodiment, the dynamic compensation system 800 includes a first storage unit 81 for storing a target (target) common electrode voltage. The dynamic compensation system 800 further comprises a second storage unit 82 for storing the initial common electrode voltage. When the programmable gamma circuit 25 (fig. 2) of the liquid crystal display 200 is turned on (step 31, fig. 3), the first operation unit 83 obtains the initial common electrode voltage (step 32, fig. 3) from the second memory cell 82 as the current common electrode Voltage (VCOM), and stores the current common electrode Voltage (VCOM) in the third memory cell 84.
The dynamic compensation system 800 further comprises a fourth storage unit 85 for storing the compensation voltage during each compensation period. In the common electrode voltage compensation process, the timing controller 21 obtains the compensation voltage during the current compensation period from the fourth storage unit 85, and the second operation unit 86 generates and outputs the common electrode voltage during the current compensation period according to the current common electrode voltage and the compensation voltage during the current compensation period. If the last compensation period has not been reached, the output common electrode voltage is restored to the third memory unit 84, and the second operation unit 86 is used to output the corresponding common electrode voltage during the next compensation period, until the compensation of the common electrode voltage during the last compensation period is completed and the target common electrode voltage is reached, the compensation of the common electrode voltage is ended. The first memory unit 81, the second memory unit 82, the third memory unit 84 and the fourth memory unit 85 may be independent or integrated, and may be implemented in the timing controller 21 or the programmable gamma circuit 25. If the method is realized in the time schedule controller 21, the method is arranged in the time schedule controller 21; if implemented in the programmable gamma circuit 25, it is provided inside the programmable gamma circuit 25. As mentioned above, the progressive compensation performed by the present embodiment belongs to a non-strict change (non-strict changing) compensation, such as a non-strict increase compensation. For non-stringent increase compensation, the common electrode voltage at the previous time is less than or equal to (≦) the common electrode voltage at the later time. Therefore, during some (at least one) compensation period, the common electrode voltage at the later time may be equal to the common electrode voltage at the previous time. In a preferred embodiment, the gradual compensation performed in this embodiment employs a non-equal voltage interval to compensate the common electrode voltage.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the claims of the present invention; it is intended that all such equivalent changes and modifications be included within the scope of the appended claims without departing from the spirit of the invention as disclosed.
Claims (12)
1. A liquid crystal display, comprising:
A display panel;
A time sequence controller;
A gate driver and a source driver controlled by the timing controller for displaying images on the display panel; and
The table look-up unit is arranged in the time schedule controller and stores initial common electrode voltage, target common electrode voltage and corresponding compensation voltage in a plurality of compensation periods;
The timing controller generates a common electrode voltage in a corresponding compensation period according to the initial common electrode voltage and the compensation voltage in each compensation period, and performs progressive compensation on the common electrode voltage until the target common electrode voltage is reached.
2. The liquid crystal display of claim 1, wherein the liquid crystal display comprises an advanced super-dimensional field-switching liquid crystal display.
3. The liquid crystal display according to claim 1, wherein the gradual compensation is a non-strictly changing compensation.
4. The liquid crystal display of claim 3, wherein during at least one compensation period, a common electrode voltage at a later time is equal to a common electrode voltage at a previous time.
5. The liquid crystal display according to claim 3, wherein the gradual compensation uses a non-equal voltage spacing to compensate the common electrode voltage.
6. A dynamic compensation system for common electrode voltage, comprising:
A first storage unit for storing the target common electrode voltage;
A second storage unit for storing the initial common electrode voltage;
A first arithmetic unit for generating an initial common electrode voltage;
A third storage unit for storing the initial common electrode voltage as the current common electrode voltage;
A fourth storage unit for storing the compensation voltage in each compensation period; and
A second operation unit for generating and outputting the common electrode voltage during the current compensation period according to the compensation voltage during the current compensation period and the current common electrode voltage during the common electrode voltage compensation process;
Wherein the second arithmetic unit continuously performs the gradual compensation on the common electrode voltage until the compensation of the common electrode voltage during the last compensation period is completed and the target common electrode voltage is reached.
7. the dynamic compensation system of claim 6, wherein the first operation unit generates the initial common electrode voltage when a timing controller of a liquid crystal display is turned on.
8. The system of claim 6, wherein the first operation unit generates the initial common electrode voltage when a programmable gamma circuit of a liquid crystal display is turned on.
9. the dynamic compensation system for common electrode voltage of claim 6, which is suitable for advanced super-dimensional field switching liquid crystal display.
10. A system for dynamic compensation of common electrode voltage according to claim 6, wherein the progressive compensation is of a non-strictly changing compensation.
11. The system for dynamic compensation of common electrode voltages of claim 10, wherein during at least one compensation, a common electrode voltage at a later time is equal to a common electrode voltage at a previous time.
12. The system of claim 10, wherein the gradual compensation employs a non-equal time voltage interval to compensate the common electrode voltage.
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| CN201810520808.0A CN110544460B (en) | 2018-05-28 | 2018-05-28 | Liquid crystal display and dynamic compensation system of common electrode voltage thereof |
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