CN108766326B - Method and device for obtaining Vcom by adjusting Flicker - Google Patents
Method and device for obtaining Vcom by adjusting Flicker Download PDFInfo
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- CN108766326B CN108766326B CN201810376064.XA CN201810376064A CN108766326B CN 108766326 B CN108766326 B CN 108766326B CN 201810376064 A CN201810376064 A CN 201810376064A CN 108766326 B CN108766326 B CN 108766326B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a method for obtaining Vcom by adjusting Flicker, which comprises the following steps: sequentially collecting first Flicker values at N preset positions on the display panel, and adjusting the values of common electrode voltages corresponding to the preset positions according to the first Flicker values to obtain N initial common electrode voltages; sequentially loading each initial common electrode voltage as a value of the common electrode voltage, collecting second Flicker values at the N preset positions under each initial common electrode voltage, and sequentially calculating the difference between the maximum value and the minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values; and selecting the initial common electrode voltage corresponding to the minimum value of the N difference values as the optimal common electrode voltage. The obtained common electrode voltage is optimal for the whole panel, the phenomenon of image residue possibly occurring in partial area is effectively avoided, and the display effect is improved.
Description
Technical Field
The invention belongs to the field of liquid crystal panels, and particularly relates to a method and a device for obtaining Vcom by adjusting Flicker.
Background
In the field of liquid crystal panels, the Flicker phenomenon of horizontal stripes, generally called Flicker phenomenon, is generated due to polarity switching of a common electrode voltage (Vcom), and the numerical value of the Flicker value also directly reflects the quality reliability of the liquid crystal panel. Generally, the smaller the value of Flicker, the less risk of Image Sticking (IS) of the liquid crystal panel, and vice versa. Before the liquid crystal display screen leaves a factory, a manufacturer can perform one-time factory adjustment on the Vcom voltage, so that the influence of the Vcom voltage on backlight flicker in the liquid crystal display screen is reduced. The existing scheme is as follows: 1. placing a sensor for detecting a voltage signal in the center of the panel; 2. the display panel displays 127 gray scales Flicker, and VCOM is correspondingly adjusted to enable Flicker at the central point to be minimum; 3. and writing the obtained Vcom which enables the Flicker of the central point to be minimum into the Gamma chip as the Vcom of the whole panel.
However, the data line voltage signal and the scan line voltage signal are attenuated step by step, the optimal Vcom at different positions in the panel is different, and when a certain region is adjusted to be the optimal Vcom, the optimal Vcom may not be the optimal Vcom for other regions. And as the size of the panel increases, the distribution of Flicker becomes more and more uneven, the Vcom obtained by adjusting the Flicker value of Flicker at the center point cannot reflect the whole Vcom of the panel, and image retention may occur in a part of the area as time goes on.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a method and an apparatus for obtaining Vcom by adjusting Flicker. The technical problem to be solved by the invention is realized by the following technical scheme:
the embodiment of the invention provides a method for obtaining Vcom by adjusting Flicker, which is applied to a display panel and comprises the following steps:
sequentially collecting first Flicker values at N preset positions on the display panel, and adjusting the values of common electrode voltages corresponding to the preset positions according to the first Flicker values to obtain N initial common electrode voltages;
sequentially loading each initial common electrode voltage as a value of the common electrode voltage, collecting second Flicker values at the N preset positions under each initial common electrode voltage, and sequentially calculating the difference between the maximum value and the minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values;
and selecting the initial common electrode voltage corresponding to the minimum value of the N difference values as the optimal common electrode voltage, wherein N is more than or equal to 2.
In a specific embodiment, sequentially loading different initial common electrode voltages as values of the common electrode voltages, collecting second Flicker values at the N predetermined positions under each of the different initial common electrode voltages, and sequentially calculating a difference between a maximum value and a minimum value of the second Flicker values under each of the different initial common electrode voltages to obtain N difference values, including:
sequencing the obtained N initial common electrode voltages, and selecting a maximum common electrode voltage Vmax and a minimum common electrode voltage Vmin;
loading the minimum common electrode voltage Vmin as a value of a common electrode voltage, collecting Flicker values at the N preset positions under the minimum common electrode voltage Vmin, and calculating the difference between the maximum value and the minimum value in the Flicker values at the N preset positions;
according to the sorted sequence, sequentially selecting initial common electrode voltages corresponding to the sequence as values of the common electrode voltages, collecting Flicker values at the N preset positions under the initial common electrode voltages of the sequence, and sequentially calculating the difference between the maximum value and the minimum value of the Flicker values at the N preset positions to obtain N difference values.
In a specific embodiment, the predetermined location comprises a location of a geometric center point of the display panel.
The invention also provides a device for obtaining Vcom by adjusting Flicker, which comprises:
the N detection sensors are respectively and correspondingly arranged at N preset positions of the display panel and are used for acquiring Flicker values of the N preset positions;
the microprocessor is connected with the N detection sensors and is used for controlling the detection sensors to work, acquiring first Flicker values of the N preset positions and adjusting the common electrode voltage of the preset position according to the first Flicker values to obtain N initial common electrode voltages;
the microprocessor is further configured to sequentially select each initial common electrode voltage as a value of a common electrode voltage, obtain second Flicker values at the N predetermined positions under each initial common electrode voltage, sequentially calculate a difference between a maximum value and a minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values, and select an initial common electrode voltage corresponding to a minimum value of the N difference values as an optimal common electrode voltage, where N is greater than or equal to 2.
In a specific embodiment, when acquiring Flicker values of N predetermined positions of the display panel, the microprocessor controls only one of the detection sensors to operate at the same time.
In one embodiment, the microprocessor controls each of the detection sensors to operate when acquiring the second Flicker values at the N predetermined positions at each of the different initial common electrode voltages.
In a specific embodiment, the predetermined location comprises a location of a geometric center point of the display panel.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by collecting Flicker values of a plurality of different positions of the display panel and the algorithm provided by the invention, the obtained common electrode voltage is optimal for the whole panel, the phenomenon of image residue possibly occurring in a part of area is effectively avoided, and the display effect is improved.
Drawings
FIG. 1 is a flowchart of a method for obtaining Vcom by adjusting Flicker according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating division of a display panel area when N is 9 according to an embodiment of the present invention;
FIG. 3 is a block diagram of a device for obtaining Vcom by adjusting Flicker according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a flowchart of a method for obtaining Vcom by adjusting Flicker according to an embodiment of the present invention.
The embodiment of the invention provides a method for obtaining Vcom by adjusting Flicker, which is applied to a display panel and comprises the following steps:
sequentially collecting first Flicker values at N preset positions on the display panel, and adjusting the values of common electrode voltages corresponding to the preset positions according to the first Flicker values to obtain N initial common electrode voltages;
sequentially loading each initial common electrode voltage as a value of the common electrode voltage, collecting second Flicker values at the N preset positions under each initial common electrode voltage, and sequentially calculating the difference between the maximum value and the minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values;
and selecting the initial common electrode voltage corresponding to the minimum value of the N difference values as the optimal common electrode voltage, wherein N is more than or equal to 2. The value of N depends on the actual conditions such as the panel size and the resolution.
For a liquid crystal display panel (TFT LCD), the TFT LCD is composed of two pieces of glass, which are an upper substrate and a lower substrate respectively, wherein a color filter plate is arranged on the upper substrate, a TFT is arranged on a lower polar plate, a liquid crystal layer is clamped between the upper substrate and the lower substrate, and a display is formed by matching elements such as a polarizing plate, a backlight plate, a light source, a scanning line, a data line, a driving circuit and the like on the periphery. In order to realize the deflection of the liquid crystal molecules in the liquid crystal layer, the common electrode voltage Vcom needs to be set for control, so that the positive deflection and the negative deflection of the liquid crystal molecules are rotationally symmetrical, and the display effect is improved.
However, since the voltages applied to the scan line and the data line have transmission loss during transmission, the voltages applied to the sub-pixels become small, and the symmetry of the common electrode voltage Vcom is broken. As the size of the display panel increases, the loss of the scan lines and the data lines at different positions in the display panel is less controllable, so that how to select an optimal common electrode voltage Vcom is a problem to be solved in order to achieve the display effect at each position of the display panel.
To better explain the working process of the embodiment, please refer to fig. 2, and fig. 2 is a schematic diagram illustrating the division of the display panel area when N is 9 according to the embodiment of the present invention.
To obtain data, corresponding sensors, i.e., S1 on the upper left, S2 on the upper right, S3 on the upper right, S4 on the left, S5 at the geometric center, S6 on the right, S7 on the lower left, S8 on the lower right, and S9 on the lower right, are required. Preferably, the 9 positions divide the display panel into a "nine-grid" shape, and the 9 positions are sequentially located at the central position of each grid in the "nine-grid" shape, so that the set positions are uniformly distributed on the display panel.
Preferably, the predetermined position comprises a position of a geometric center point of the display panel. Generally, at least the Flicker value of the position of the geometric center point of the panel is needed to be obtained.
Sequentially collecting Flicker values at the 9 different positions, namely first Flicker values, and adjusting the value of the common electrode voltage corresponding to the position according to each first Flicker value to obtain 9 initial common electrode voltages;
it should be noted that, because the positions of the acquisition points are different, the signal attenuation is also different, and each time one of the positions is acquired, the initial common electrode voltage corresponding to the position (i.e. the optimal Vcom at the position) is obtained, and the 9 initial common electrode voltages obtained by performing the process of 9 acquisitions are respectively Vcom1-Vcom 9.
Of course, there is no particular requirement on the order of acquiring Vcom1-Vcom9, as long as these 9 data can be acquired in sequence.
Adjusting the voltage of a common electrode of the panel to be Vcom1, acquiring Flicker values at 9 positions, namely a second Flicker value, simultaneously under the condition, and subtracting the maximum value and the minimum value of the 9 Flicker values to obtain a difference value V1;
according to the method, the voltage of the common electrode of the panel is sequentially regulated to Vcom2, under the condition, Flicker values at 9 positions, namely second Flicker values, are simultaneously acquired, and the maximum value and the minimum value of the 9 Flicker values are subjected to subtraction to obtain a difference value V2;
sequentially adjusting the difference value to Vcom3-Vcom9 to finally obtain 9 difference values V1-V9;
for example, when V4 is the smallest difference, Vcom4 corresponding to V4 is found as the best common electrode voltage Vcom of the whole panel.
In a specific embodiment, sequentially loading different initial common electrode voltages as values of the common electrode voltages, collecting second Flicker values at the N predetermined positions under each of the different initial common electrode voltages, and sequentially calculating a difference between a maximum value and a minimum value of the second Flicker values under each of the different initial common electrode voltages to obtain N difference values, including:
sequencing the obtained N initial common electrode voltages, and selecting a maximum common electrode voltage Vmax and a minimum common electrode voltage Vmin;
loading the minimum common electrode voltage Vmin as a value of a common electrode voltage, collecting Flicker values at the N preset positions under the minimum common electrode voltage Vmin, and calculating the difference between the maximum value and the minimum value in the Flicker values at the N preset positions;
according to the sorted sequence, sequentially selecting initial common electrode voltages corresponding to the sequence as values of the common electrode voltages, collecting Flicker values at the N preset positions under the initial common electrode voltages of the sequence, and sequentially calculating the difference between the maximum value and the minimum value of the Flicker values at the N preset positions to obtain N difference values.
For convenience of Vcom adjustment, the acquired Vcom1-Vcom9 are sorted in size, for example, Vcom9, Vcom8, Vcom6, Vcom7, Vcom4, Vcom5, Vcom3, Vcom1, and Vcom2 are in sequence from small to large. Then, the voltage value of Vcom9 is loaded as the value of the panel common electrode voltage, a difference value V9 is obtained according to the above process, and the corresponding difference values of Vcom8, Vcom6, Vcom7, Vcom4, Vcom5, Vcom3, Vcom1, and Vcom2 are sequentially obtained, so as to obtain 9 difference values V1-V9 finally.
According to the invention, by collecting Flicker values of a plurality of different positions of the display panel and the algorithm provided by the invention, the obtained common electrode voltage is optimal for the whole panel, the phenomenon of image residue possibly occurring in a part of area is effectively avoided, and the display effect is improved.
Example two
The invention also provides a device for obtaining Vcom by adjusting Flicker, which comprises:
the N detection sensors are respectively and correspondingly arranged at N preset positions of the display panel and are used for acquiring Flicker values of the N preset positions;
the microprocessor is connected with the N detection sensors and is used for controlling the detection sensors to work, acquiring first Flicker values of the N preset positions and adjusting the common electrode voltage of the preset position according to the first Flicker values to obtain N initial common electrode voltages;
the microprocessor is further configured to sequentially select each initial common electrode voltage as a value of a common electrode voltage, obtain second Flicker values at the N predetermined positions under each initial common electrode voltage, sequentially calculate a difference between a maximum value and a minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values, and select an initial common electrode voltage corresponding to a minimum value of the N difference values as an optimal common electrode voltage, where N is greater than or equal to 2.
In a specific embodiment, when acquiring Flicker values of N predetermined positions of the display panel, the microprocessor controls only one of the detection sensors to operate at the same time.
In one embodiment, the microprocessor controls each of the detection sensors to operate when acquiring the second Flicker values at the N predetermined positions at each of the different initial common electrode voltages.
Also taking N as an example, the position of the detection sensor is set according to the first embodiment, wherein the microprocessor is an FPGA (Field-Programmable Gate Array) chip. In this embodiment, there is no special requirement on the acquisition sequence, and any one of the sequences is selected as follows:
step one, the FPGA controls a detection sensor S1 to be started, and Vcom at the position of S1 is adjusted according to a Flicker value acquired by the detection sensor S1, so that the optimal Vcom1 at the position of S1 is obtained;
step two, the FPGA controls the detection sensor S1 to be closed, controls the detection sensor S2 to be opened, and adjusts Vcom at the position of S2 according to a Flicker value acquired by the detection sensor S2 to obtain the optimal Vcom2 at the position of S2;
step three, the FPGA controls the detection sensor S2 to be closed, controls the detection sensor S3 to be opened, and adjusts Vcom at the position of S3 according to a Flicker value acquired by the detection sensor S3 to obtain the optimal Vcom3 at the position of S3;
step four, the FPGA controls the detection sensor S3 to be closed, controls the detection sensor S3 to be opened, and adjusts Vcom at the position of S3 according to a Flicker value acquired by the detection sensor S3 to obtain the optimal Vcom3 at the position of S3;
step four, the FPGA controls the detection sensor S3 to be closed, controls the detection sensor S4 to be opened, and adjusts Vcom at the position of S4 according to a Flicker value acquired by the detection sensor S4 to obtain the optimal Vcom4 at the position of S4;
step five, the FPGA controls the detection sensor S4 to be closed, controls the detection sensor S5 to be opened, and adjusts Vcom at the position of S5 according to a Flicker value acquired by the detection sensor S5 to obtain the optimal Vcom5 at the position of S5;
step six, the FPGA controls the detection sensor S5 to be closed, controls the detection sensor S6 to be opened, and adjusts Vcom at the position of S6 according to a Flicker value acquired by the detection sensor S6 to obtain the optimal Vcom6 at the position of S6;
step seven, the FPGA controls the detection sensor S6 to be closed, controls the detection sensor S7 to be opened, and adjusts Vcom at the position of S7 according to a Flicker value acquired by the detection sensor S7 to obtain the optimal Vcom7 at the position of S7;
step eight, the FPGA controls the detection sensor S7 to be closed, controls the detection sensor S8 to be opened, and adjusts Vcom at the position of S8 according to a Flicker value acquired by the detection sensor S8 to obtain the optimal Vcom8 at the position of S8;
step nine, the FPGA controls the detection sensor S8 to be closed, controls the detection sensor S9 to be opened, and adjusts Vcom at the position of S9 according to a Flicker value acquired by the detection sensor S9 to obtain the optimal Vcom9 at the position of S9;
step ten, the FPGA sequences the sizes of Vcom1-Vcom9 to find the maximum values Vmax and Vmin;
step eleven, the FPGA controls all the detection sensors to be started, adjusts the voltage of a common electrode to be Vmin, simultaneously collects 9 Flicker values, and calculates the difference between the maximum value and the minimum value in the 9 Flicker values;
step eleven, the FPGA controls all the detection sensors to be started, common electrode voltage is sequentially adjusted to be sequenced voltage values, and 9 difference values are obtained by analogy in sequence and are V1-V9;
step twelve, find the Vcom corresponding to the minimum value in V1-V9 as the optimum common electrode voltage Vcom of the whole panel.
In a specific embodiment, when acquiring Flicker values of N predetermined positions of the display panel, the microprocessor controls only one of the detection sensors to operate at the same time.
In one embodiment, the microprocessor controls each of the detection sensors to operate when acquiring the second Flicker values at the N predetermined positions at each of the different initial common electrode voltages.
According to the invention, by collecting Flicker values of a plurality of different positions of the display panel and the algorithm provided by the invention, the obtained common electrode voltage is optimal for the whole panel, the phenomenon of image residue possibly occurring in a part of area is effectively avoided, and the display effect is improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A method for obtaining Vcom by adjusting Flicker is applied to a display panel and is characterized by comprising the following steps:
sequentially collecting first Flicker values at N preset positions on the display panel, and adjusting the values of common electrode voltages corresponding to the preset positions according to the first Flicker values to obtain N initial common electrode voltages;
sequentially loading each initial common electrode voltage as a value of the common electrode voltage, collecting second Flicker values at the N preset positions under each initial common electrode voltage, and sequentially calculating the difference between the maximum value and the minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values;
selecting an initial common electrode voltage corresponding to the minimum value of the N difference values as an optimal common electrode voltage, wherein N is more than or equal to 2;
the loading different initial common electrode voltages in turn is used as the values of the common electrode voltages, second Flicker values at the N preset positions under each different initial common electrode voltage are collected, the difference between the maximum value and the minimum value in the second Flicker values under each different initial common electrode voltage is calculated in turn, and N difference values are obtained, wherein the method comprises the following steps:
sequencing the obtained N initial common electrode voltages, and selecting a maximum common electrode voltage Vmax and a minimum common electrode voltage Vmin;
loading the minimum common electrode voltage Vmin as a value of a common electrode voltage, collecting Flicker values at the N preset positions under the minimum common electrode voltage Vmin, and calculating the difference between the maximum value and the minimum value in the Flicker values at the N preset positions;
according to the sorted sequence, sequentially selecting initial common electrode voltages corresponding to the sequence as values of the common electrode voltages, collecting Flicker values at the N preset positions under the initial common electrode voltages of the sequence, and sequentially calculating the difference between the maximum value and the minimum value of the Flicker values at the N preset positions to obtain N-1 difference values.
2. The method for obtaining Vcom by adjusting flickers according to claim 1, wherein the predetermined position comprises a position of a geometric center point of the display panel.
3. A Flicker adjustment device, comprising:
the N detection sensors are respectively and correspondingly arranged at N preset positions of the display panel and are used for acquiring Flicker values of the N preset positions;
the microprocessor is connected with the N detection sensors and is used for controlling the detection sensors to work, acquiring first Flicker values of the N preset positions and adjusting the common electrode voltage of the preset position according to the first Flicker values to obtain N initial common electrode voltages;
the microprocessor is further used for sequentially selecting each initial common electrode voltage as a value of the common electrode voltage, obtaining second Flicker values at the N preset positions under each initial common electrode voltage, sequentially calculating the difference between the maximum value and the minimum value of the second Flicker values under each initial common electrode voltage to obtain N difference values, and selecting the initial common electrode voltage corresponding to the minimum value of the N difference values as the optimal common electrode voltage, wherein N is larger than or equal to 2;
the loading different initial common electrode voltages in turn is used as the values of the common electrode voltages, second Flicker values at the N preset positions under each different initial common electrode voltage are collected, the difference between the maximum value and the minimum value in the second Flicker values under each different initial common electrode voltage is calculated in turn, and N difference values are obtained, wherein the method comprises the following steps:
sequencing the obtained N initial common electrode voltages, and selecting a maximum common electrode voltage Vmax and a minimum common electrode voltage Vmin;
loading the minimum common electrode voltage Vmin as a value of a common electrode voltage, collecting Flicker values at the N preset positions under the minimum common electrode voltage Vmin, and calculating the difference between the maximum value and the minimum value in the Flicker values at the N preset positions;
according to the sorted sequence, sequentially selecting initial common electrode voltages corresponding to the sequence as values of the common electrode voltages, collecting Flicker values at the N preset positions under the initial common electrode voltages of the sequence, and sequentially calculating the difference between the maximum value and the minimum value of the Flicker values at the N preset positions to obtain N-1 difference values.
4. The Flicker adjustment device according to claim 3, wherein the microprocessor controls only one of the detecting sensors to operate at the same time when obtaining Flicker values at N predetermined positions of the display panel.
5. The Flicker adjustment device according to claim 3, wherein the microprocessor controls each of the detection sensors to operate when acquiring the second Flicker value at the N predetermined positions at each of the different initial common electrode voltages.
6. The Flicker adjustment apparatus of claim 3, wherein the predetermined position comprises a position of a geometric center point of the display panel.
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