CN107665689B - Gamma chip, time sequence control chip and liquid crystal display device - Google Patents
Gamma chip, time sequence control chip and liquid crystal display device Download PDFInfo
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- CN107665689B CN107665689B CN201711024753.6A CN201711024753A CN107665689B CN 107665689 B CN107665689 B CN 107665689B CN 201711024753 A CN201711024753 A CN 201711024753A CN 107665689 B CN107665689 B CN 107665689B
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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 provides a gamma chip, a time sequence control chip and a liquid crystal display device. The gamma chip comprises a voltage input end and a plurality of binding point voltage output ends, the voltage receiving end receives an initial voltage, the gamma chip divides the received initial voltage to obtain a plurality of binding point voltages and outputs the binding point voltages through the binding point voltage output ends, the binding point voltages correspond to voltages in a preset voltage-brightness curve, the gamma chip divides the voltage of a first gray scale range according to a first division mode to obtain N binding point voltages, divides the voltage of a second gray scale range according to a second division mode to obtain M binding point voltages, divides the voltage of a third gray scale range according to a third division mode to obtain P binding point voltages, the gray scale of the first gray scale range is the lowest gray scale of three gray scale ranges, and the resistance number corresponding to each gray scale of the first gray scale range is greater than the resistance number corresponding to each gray scale of the second gray scale range and greater than the resistance number corresponding to each gray scale of the third gray scale range.
Description
Technical Field
The invention relates to the field of liquid crystal display, in particular to a gamma chip, a time sequence control chip and a liquid crystal display device.
Background
With the rapid development of semiconductor technology, liquid crystal display technology, and other technologies, liquid crystal display devices are popular among consumers due to their advantages of light weight and low power consumption. The liquid crystal display device includes a Gamma chip (Gamma IC), a timing control chip (TCON), a liquid crystal display panel, and the like. The gamma chip receives external voltage and converts the external voltage into a plurality of binding voltage, the time sequence control chip receives the binding voltage and obtains a plurality of gray scale voltages according to the binding voltage, and the gray scale voltages are provided for the liquid crystal display panel, so that the liquid crystal display panel displays different gray scales. Taking the example that the liquid crystal display panel displays 256 gray scales, the gamma chip receives external voltage and converts the external voltage into 9 binding voltages, and the time sequence control chip receives the 9 binding voltages and obtains 256 gray scale voltages according to the 9 binding voltages. The gamma chip comprises a plurality of resistors connected in series together so as to divide the received external voltage to obtain a plurality of binding voltages. The time sequence control chip comprises a plurality of resistors connected in series, and the received binding point voltage is divided to obtain a plurality of gray scale voltages. Therefore, the gray scale voltages are obtained by uniformly dividing the original voltages, however, the sensitivity of human eyes to different gray scales is different, and the sensitivity of human eyes to low gray scales is higher than that to high gray scales. Therefore, the conventional voltage division method causes the user to feel that the display effect of the low gray scale is not fine enough, and further causes the user to feel that the display effect is not good when the user watches the image or the video displayed by the liquid crystal display panel.
Disclosure of Invention
The invention provides a gamma chip, which comprises a voltage input end and a plurality of binding point voltage output ends, wherein the voltage input end is used for receiving initial voltage, the gamma chip is used for dividing the initial voltage received by the voltage input end to obtain a plurality of binding point voltages with different voltage values, each binding point voltage is output through one binding point voltage output end, the binding point voltage corresponds to a voltage in a preset voltage-brightness curve displayed when a liquid crystal display panel displays preset brightness, and when the gamma chip divides the received initial voltage: dividing voltage corresponding to a first gray scale range according to a first voltage dividing method to obtain N binding point voltages corresponding to the first gray scale range, dividing voltage corresponding to a second gray scale range according to a second voltage dividing method to obtain M binding point voltages corresponding to the second gray scale range, dividing voltage corresponding to a third gray scale range according to a third voltage dividing method to obtain P binding point voltages corresponding to the third gray scale range, wherein the gray scale in the first gray scale range is smaller than the gray scale in the second gray scale range, the gray scale in the second gray scale range is smaller than the gray scale in the third gray scale range, the number of resistors corresponding to each gray scale is a first preset number when voltage is divided according to the first voltage dividing method, the number of resistors corresponding to each gray scale is a second preset number when voltage is divided according to the second voltage dividing method, and the number of resistors corresponding to each gray scale is a third preset number when voltage is divided according to the third voltage dividing method, the first preset number is larger than the second preset number, the first preset number is larger than the third preset number, N, M and P are positive integers, and N + M + P is equal to the preset number.
Compared with the prior art, when the gamma chip divides the received initial voltage: the method comprises the steps of dividing voltage in a first gray scale range according to a first voltage dividing mode to obtain N binding point voltages in the first gray scale range, dividing voltage in a second gray scale range according to a second voltage dividing mode to obtain M binding point voltages in the second gray scale range, dividing voltage in a third gray scale range according to a third voltage dividing mode to obtain P binding point voltages in a third gray scale range, wherein the first preset number is larger than the second preset number, and the first preset number is larger than the third preset number. Because the first preset number is greater than the second preset number and greater than the third preset number, the gamma chip of the invention divides the gray scale in the first gray scale range more finely, divides one gray scale into more sub gray scales, and the preset number of gray scales in the gray scale range corresponds to the gray scale, so that when a user watches images or videos displayed by the liquid crystal display panel, the display effect in the gray scale range is more exquisite, and the watching effect of the user when watching the images or videos is improved. Furthermore, the gamma chip of the invention adopts rough voltage division for the gray scale in the third gray scale range, so that the number of resistors in the gray scale range is reduced, and the binding voltage corresponding to the preset number of gray scales in the gray scale range is less. Therefore, the gamma chip of the present invention can utilize the conventional architecture of the binding voltage output terminals of the gamma chip without increasing the number of the total binding voltage output terminals.
The invention also provides a time sequence control chip, which comprises a plurality of binding point voltage receiving ends and a plurality of gray scale voltage output ends, wherein each binding point voltage receiving end is used for receiving a binding point voltage, the binding point voltages received by each binding point voltage receiving end are different, the binding point voltages correspond to the voltages in a preset voltage-brightness curve displayed when the liquid crystal display panel displays preset brightness, and when the time sequence control chip divides the received binding point voltages: dividing voltage corresponding to a fourth gray scale range according to a fourth voltage dividing method to obtain A gray scale voltages corresponding to a fourth gray scale range, dividing voltage corresponding to a fifth gray scale range according to a fifth voltage dividing method to obtain B gray scale voltages corresponding to a fifth gray scale range, dividing voltage corresponding to a sixth gray scale range according to a sixth voltage dividing method to obtain C gray scale voltages corresponding to a sixth gray scale range, wherein the gray scale in the fourth gray scale range is smaller than the gray scale in the fifth gray scale range, the gray scale in the fifth gray scale range is smaller than the gray scale in the sixth gray scale range, the number of resistors corresponding to each gray scale is a fourth preset number when voltage is divided according to the fourth voltage dividing method, the number of resistors corresponding to each gray scale is a fifth preset number when voltage is divided according to the fifth voltage dividing method, and the number of resistors corresponding to each gray scale is a sixth preset number when voltage is divided according to the sixth voltage dividing method, the fourth preset number is greater than the fifth preset number, the fourth preset number is greater than the sixth preset number, A, B and C are positive integers, and A + B + C is equal to the preset number.
The invention also provides a liquid crystal display device which comprises the gamma chip or the time sequence control chip.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a gamma chip according to a preferred embodiment of the present invention.
Fig. 2 is a preset voltage-brightness curve diagram exhibited when the liquid crystal display panel displays a preset brightness.
Fig. 3 is a schematic structural diagram of a timing control chip according to a preferred embodiment of the invention.
Fig. 4 is a schematic structural diagram of a liquid crystal display device according to a preferred embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2 together, fig. 1 is a schematic structural diagram of a gamma chip according to a preferred embodiment of the invention; fig. 2 is a preset voltage-brightness curve diagram exhibited when the liquid crystal display panel displays a preset brightness. The Gamma chip (Gamma IC)100 includes a voltage input terminal 110 and a plurality of binding voltage output terminals 120. The voltage input terminal 110 is configured to receive an initial voltage, and the gamma chip 100 is configured to divide the initial voltage received by the voltage input terminal 110 to obtain a plurality of binding voltages having different voltage values, each binding voltage being output through a binding voltage output terminal 120. The tie voltage corresponds to a voltage in a preset voltage-brightness curve (as shown in fig. 2, such as a Gamma 2.2 curve) exhibited when the liquid crystal display panel displays a preset brightness, and when the Gamma chip 100 divides the received initial voltage: dividing voltage corresponding to a first gray scale range according to a first voltage dividing method to obtain N binding point voltages corresponding to the first gray scale range, dividing voltage corresponding to a second gray scale range according to a second voltage dividing method to obtain M binding point voltages corresponding to the second gray scale range, dividing voltage corresponding to a third gray scale range according to a third voltage dividing method to obtain P binding point voltages corresponding to the third gray scale range, wherein the gray scale in the first gray scale range is smaller than the gray scale in the second gray scale range, the gray scale in the second gray scale range is smaller than the gray scale in the third gray scale range, the number of resistors corresponding to each gray scale is a first preset number when voltage is divided according to the first voltage dividing method, the number of resistors corresponding to each gray scale is a second preset number when voltage is divided according to the second voltage dividing method, and the number of resistors corresponding to each gray scale is a third preset number when voltage is divided according to the third voltage dividing method, the first preset number is larger than the second preset number, the first preset number is larger than the third preset number, N, M and P are positive integers, and N + M + P is equal to the preset number. Taking the example of the liquid crystal display panel displaying 256 gray scales, the N + M + P is equal to 9. That is, the gamma chip 100 receives an initial voltage through the voltage input terminal 110, and the gamma chip 100 divides the initial voltage to obtain 9 binding voltages having voltage values different from each other. At this time, the number of the binding voltage output terminals 120 is also 9. The binding voltages correspond one-to-one to the binding voltage outputs, i.e., each binding voltage is output through one binding voltage output 120. The gamma chip 100 includes a plurality of resistors connected in series, and can divide an initial voltage received by the voltage input terminal 110 to obtain a plurality of binding voltages having different voltage values. In one embodiment, the number of the resistors is the same as the number of gray scales displayed by the liquid crystal display panel.
In this embodiment, the first preset number is greater than the second preset number, and the second preset number is greater than the third preset number.
In other embodiments, the first predetermined number is greater than the second predetermined number, and the second predetermined number is equal to the third predetermined number.
In one embodiment, the first gray scale range, the second gray scale range and the third gray scale range are three continuous gray scale ranges. For example, taking the liquid crystal display panel displaying 256 gray scales as an example, the first gray scale range is 0 to 31 gray scales; the second gray scale range is 32-127 gray scales; the third gray scale range is 128-255 gray scales. The first gray scale range is 0-31, because the brightness is greatly changed along with the gray scale in the gray scale range and human eyes are sensitive to the change of the brightness in the gray scale range along with the gray scale, the gray scale in the gray scale range is divided according to the first voltage dividing mode, so that the number of resistors corresponding to each gray scale is large, the binding point voltage corresponding to the preset number of gray scales in the gray scale range is large, namely, one gray scale is divided into more sub-gray scales, the display effect in the gray scale range is fine and smooth when a user watches images or videos displayed when the user watches the liquid crystal display panel, and the watching effect of the user when the user watches the images or videos is improved. The third gray scale range is 128 to 255 because the brightness changes approximately linearly with the gray scale within the gray scale range and human eyes are less sensitive to the change of the brightness with the gray scale within the gray scale range.
In another embodiment, a first transition gray scale range is included between the first gray scale range and the second gray scale range, and a second transition gray scale range is included between the second gray scale range and the third gray scale range. The gray scale in the first transition gray scale range is larger than the gray scale in the first gray scale range, the gray scale in the first transition gray scale range is smaller than the gray scale in the second gray scale range, the gray scale in the second transition gray scale range is larger than the gray scale in the second gray scale range, and the gray scale in the second transition gray scale range is smaller than the gray scale in the third gray scale range. Dividing voltage in the first transition gray scale range according to a fourth voltage dividing mode, wherein when voltage is divided according to the fourth voltage dividing mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the first transition gray scale range: the number of resistors corresponding to the closest gray scale to the first gray scale range is greater than the number of resistors corresponding to the closest gray scale to the second gray scale range.
Dividing voltage according to a fifth voltage division mode in the second transition gray scale range, wherein when voltage is divided according to the fifth voltage division mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the second transition gray scale range: the number of resistors corresponding to the closest gray scale to the second gray scale range is greater than the number of resistors corresponding to the closest gray scale to the third gray scale range.
Therefore, the first transition gray scale range is set between the first gray scale range and the second gray scale range, and the voltage division is performed in the first transition gray scale range by adopting the fourth voltage division method, so that serious brightness jump is avoided when the voltage division is performed in the first gray scale range from the first voltage division method to the second gray scale range from the second voltage division method. Similarly, a second transition gray scale is set between the second gray scale range and the third gray scale range, and voltage division is performed in the second transition gray scale range by adopting a fifth voltage division method, so that serious brightness jump is avoided when voltage division is performed in the second gray scale range from the second voltage division method to the third gray scale range according to the third voltage division method.
For example, taking the liquid crystal display panel displaying 256 gray scales as an example, the first gray scale range is 0 to 21 gray scales; the first transition gray scale range is 22-41 gray scales; the second gray scale range is 42-117 gray scales; the second transition gray scale is 118-137 gray scale; the third gray scale is 138-255 gray scales.
In an embodiment, the first preset number is four, the second preset number is one, the third preset number is zero point five, the resistors required for voltage division according to the first voltage division method are first resistors, and the resistance values of the first resistors are the same. Preferably, the resistance value of the resistor corresponding to each gray scale in the first gray scale range is equal to the resistance value of the resistor corresponding to each gray scale in the second gray scale range, and is equal to the resistance value of the resistor corresponding to each gray scale in the third gray scale range. The resistance value of the resistor corresponding to each gray scale can be fitted to obtain the total voltage corresponding to all gray scales according to a preset voltage-brightness curve displayed when the liquid crystal display panel displays preset brightness, because the resistors in the gamma chip 100 are connected in series, the resistors corresponding to each gray scale in each gray scale range are also connected in series, and then the resistance value of the resistor corresponding to each gray scale is calculated according to a resistor voltage division principle.
In another embodiment, the first preset number is four, the second preset number is one, the third preset number is zero point five, the resistance required for voltage division according to the first voltage division method is a first resistance, and in the first gray scale range, the resistance value of the first resistance adjacent to the low gray scale in the first resistance corresponding to each gray scale is linearly increased or linearly decreased toward the resistance value of the first resistance adjacent to the high gray scale. Preferably, the resistance value of the resistor corresponding to each gray scale in the first gray scale range is equal to the resistance value of the resistor corresponding to each gray scale in the second gray scale range, and is equal to the resistance value of the resistor corresponding to each gray scale in the third gray scale range. It should be noted that the third preset number of zero-point five means that when voltage division is performed in the third gray scale range according to the third voltage division method, the number of the resistors corresponding to each gray scale is zero-point five, that is, one resistor corresponds to each two adjacent gray scales.
Compared with the prior art, when the gamma chip divides the received initial voltage: the method comprises the steps of dividing voltage in a first gray scale range according to a first voltage dividing mode to obtain N binding point voltages in the first gray scale range, dividing voltage in a second gray scale range according to a second voltage dividing mode to obtain M binding point voltages in the second gray scale range, dividing voltage in a third gray scale range according to a third voltage dividing mode to obtain P binding point voltages in a third gray scale range, wherein the first preset number is larger than the second preset number, and the first preset number is larger than the third preset number. According to the gamma chip, the gray scales in the first gray scale range are divided more finely, one gray scale is divided into more sub-gray scales, and the preset number of gray scales in the gray scale range correspond to each other, so that when a user watches images or videos displayed on the liquid crystal display panel, the display effect in the gray scale range is more exquisite, and the watching effect of the user when the user watches the images or the videos is improved. Furthermore, the gamma chip of the invention adopts rough voltage division for the gray scale in the third gray scale range, so that the number of resistors in the gray scale range is reduced, and the binding voltage corresponding to the preset number of gray scales in the gray scale range is less. Therefore, the gamma chip of the present invention can utilize the conventional architecture of the binding voltage output terminals of the gamma chip without increasing the number of the total binding voltage output terminals.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a timing control chip according to a preferred embodiment of the invention. The timing control chip 200 includes a plurality of binding voltage receiving terminals 210 and a plurality of grayscale voltage output terminals 220. Each of the binding voltage receiving terminals 210 is configured to receive a binding voltage, and the binding voltages received by each of the binding voltage receiving terminals 210 are different from each other, and the binding voltage corresponds to a voltage in a preset voltage-luminance curve (for example, a Gamma 2.2 curve as shown in fig. 2) exhibited when the liquid crystal display panel displays a preset luminance. And when the timing control chip 200 divides the received tie point voltage: dividing voltage according to a sixth voltage dividing method corresponding to a fourth gray scale range to obtain A gray scale voltages corresponding to a fourth gray scale range, dividing voltage according to a seventh voltage dividing method corresponding to a fifth gray scale range to obtain B gray scale voltages corresponding to a fifth gray scale range, dividing voltage according to an eighth voltage dividing method corresponding to a sixth gray scale range to obtain C gray scale voltages corresponding to the sixth gray scale range, wherein the gray scale in the fourth gray scale range is smaller than the gray scale in the fifth gray scale range, the gray scale in the fifth gray scale range is smaller than the gray scale in the sixth gray scale range, the number of resistors corresponding to each gray scale is a fourth preset number when voltage division is performed according to the sixth voltage dividing method, the number of resistors corresponding to each gray scale is a fifth preset number when voltage division is performed according to the seventh voltage dividing method, and the number of resistors corresponding to each gray scale is a sixth preset number when voltage division is performed according to the eighth voltage dividing method, the fourth preset number is greater than the fifth preset number, the fourth preset number is greater than the sixth preset number, A, B and C are positive integers, and A + B + C is equal to the preset number. Taking the example of the liquid crystal display panel displaying 256 gray scales, the A + B + C is equal to 256. That is, for example, 256 gray levels are displayed on the liquid crystal display panel, in this case, the number of the binding voltage receiving terminals 210 is usually 9, and the number of the gray level voltage output terminals 220 is usually 256. The timing control chip 200 includes a plurality of resistors connected in series to divide the binding voltage received by the binding voltage receiving terminal 210 to obtain a plurality of gray scale voltages having different voltage values.
The fourth gray scale range, the fifth gray scale range and the sixth gray scale range are three continuous gray scale ranges.
In an embodiment, the fourth preset number is four, the fifth preset number is one, the sixth preset number is zero point five, the resistors required for voltage division according to the sixth voltage division manner are fourth resistors, and the resistance values of the fourth resistors are the same.
It is to be understood that in other embodiments, the resistance value of the fourth resistor may also be different. In an embodiment, the fourth preset number is four, the fifth preset number is one, the sixth preset number is zero point five, the resistor required for voltage division according to the sixth voltage division manner is a fourth resistor, and in the fourth gray scale range, in the fourth resistor corresponding to each gray scale, the resistance value of the fourth resistor adjacent to the low gray scale is linearly increased or linearly decreased toward the resistance value of the fourth resistor adjacent to the high gray scale.
A third transition gray scale range is included between the fourth gray scale range and the fifth gray scale range, and a fourth transition gray scale range is included between the fifth gray scale range and the sixth gray scale range, wherein the gray scale in the third transition gray scale range is larger than the gray scale in the fourth gray scale range and the gray scale in the third transition gray scale range is smaller than the gray scale in the fifth gray scale range, the gray scale in the fourth transition gray scale range is larger than the gray scale in the fifth gray scale range and the gray scale in the fourth transition gray scale range is smaller than the gray scale in the sixth gray scale range;
dividing voltage in a third transition gray scale range according to a ninth voltage dividing mode, wherein when voltage is divided according to the ninth voltage dividing mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the third transition gray scale range: the number of the resistors corresponding to the closest gray scale of the fourth gray scale range is greater than the number of the resistors corresponding to the closest gray scale of the fifth gray scale range;
dividing voltage in a fourth transition gray scale range according to a tenth voltage mode, wherein when voltage is divided according to the tenth voltage mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the fourth transition gray scale range: the number of the resistors corresponding to the closest gray scale of the fifth gray scale range is larger than the number of the resistors corresponding to the closest gray scale of the sixth gray scale range.
Therefore, a third transition gray scale range is set between the fourth gray scale range and the fifth gray scale range, and voltage division is performed in the third transition gray scale range by adopting a ninth voltage division method, so that serious brightness jump is avoided when voltage division is performed in the fourth gray scale range according to a sixth voltage division method to the fifth gray scale range according to a sixth voltage division method. Similarly, a fourth transition gray scale is set between the fifth gray scale range and the sixth gray scale range, and voltage division is performed in the fourth transition gray scale range by adopting a tenth voltage division method, so as to avoid serious brightness jump when voltage division is performed in the fifth gray scale range from the seventh voltage division method to the sixth gray scale range from the eighth voltage division method.
For example, taking the liquid crystal display panel displaying 256 gray scales as an example, the fourth gray scale range is 0 to 21 gray scales; the third transition gray scale range is 22-41 gray scales; the fifth gray scale range is 42-117 gray scales; the fourth transition gray scale is 118-137 gray scale; the sixth gray scale is 138-255 gray scales.
Compared with the prior art, the sequential control chip 200 of the invention can divide the low gray scale more finely when dividing the received binding voltages, and divide the gray scale in the low gray scale range into more sub-gray scales, so that the display effect in the gray scale range is more exquisite, and the watching effect of a user watching images or videos is improved. Further, the timing control chip of the present invention applies a rough voltage division to the gray scale in the high gray scale range, and the number of the gray scale voltage output terminals 220 corresponding to the gray scale in the gray scale range is small. Therefore, the timing control chip 200 of the present invention can utilize the conventional architecture of the timing control chip without increasing the number of the total gray scale voltage output terminals 220.
The liquid crystal display device provided by the invention is introduced below, and the liquid crystal display device comprises any one of the gamma chip or the time sequence control chip, or comprises both the gamma chip and the time sequence control chip. Referring to fig. 4, fig. 4 is a schematic structural diagram of a liquid crystal display device according to a preferred embodiment of the invention. Fig. 4 illustrates the liquid crystal display device 10 including the gamma chip 100 and the timing control chip (TCON) 200. Meanwhile, the liquid crystal display device 10 further includes a liquid crystal display panel 300. The input terminal (binding voltage receiving terminal 210) of the timing control chip 200 is electrically connected to the binding voltage output terminal 120 of the gamma chip 100, and is configured to receive the binding voltage, and the timing control chip 200 is configured to obtain a plurality of gray scale voltages according to the binding voltage, and provide the gray scale voltages to the liquid crystal display panel 300, so that the liquid crystal display panel 300 displays different gray scales.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A gamma chip, comprising a voltage input terminal for receiving an initial voltage and a plurality of binding voltage output terminals for dividing the initial voltage received by the voltage input terminal to obtain a plurality of binding voltages having different voltage values, each binding voltage being outputted through one binding voltage output terminal, the binding voltage corresponding to a voltage in a preset voltage-luminance curve exhibited when a liquid crystal display panel displays a preset luminance, and the gamma chip dividing the received initial voltage: dividing voltage corresponding to a first gray scale range according to a first voltage dividing method to obtain N binding point voltages corresponding to the first gray scale range, dividing voltage corresponding to a second gray scale range according to a second voltage dividing method to obtain M binding point voltages corresponding to the second gray scale range, dividing voltage corresponding to a third gray scale range according to a third voltage dividing method to obtain P binding point voltages corresponding to the third gray scale range, wherein the gray scale in the first gray scale range is smaller than the gray scale in the second gray scale range, the gray scale in the second gray scale range is smaller than the gray scale in the third gray scale range, the number of resistors corresponding to each gray scale is a first preset number when voltage is divided according to the first voltage dividing method, the number of resistors corresponding to each gray scale is a second preset number when voltage is divided according to the second voltage dividing method, and the number of resistors corresponding to each gray scale is a third preset number when voltage is divided according to the third voltage dividing method, the first preset number is greater than the second preset number, the first preset number is greater than the third preset number, N, M and P are positive integers, and N + M + P is equal to the preset number;
a first transition gray scale range is included between the first gray scale range and the second gray scale range, and a second transition gray scale range is included between the second gray scale range and the third gray scale range, wherein the gray scale in the first transition gray scale range is larger than the gray scale in the first gray scale range and the gray scale in the first transition gray scale range is smaller than the gray scale in the second gray scale range, the gray scale in the second transition gray scale range is larger than the gray scale in the second gray scale range and the gray scale in the second transition gray scale range is smaller than the gray scale in the third gray scale range;
dividing voltage in the first transition gray scale range according to a fourth voltage dividing mode, wherein when voltage is divided according to the fourth voltage dividing mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the first transition gray scale range: the number of the resistors corresponding to the closest gray scale of the first gray scale range is greater than the number of the resistors corresponding to the closest gray scale of the second gray scale range;
dividing voltage according to a fifth voltage division mode in the second transition gray scale range, wherein when voltage is divided according to the fifth voltage division mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the second transition gray scale range: the number of resistors corresponding to the closest gray scale to the second gray scale range is greater than the number of resistors corresponding to the closest gray scale to the third gray scale range.
2. The gamma chip of claim 1, wherein the first, second and third grayscale ranges are three consecutive grayscale ranges.
3. The gamma chip of claim 2, wherein the first predetermined number is four, the second predetermined number is one, the third predetermined number is zero point five, and the resistors required for voltage division according to the first voltage division method are first resistors, and the resistance values of the first resistors are the same.
4. The gamma chip of claim 2, wherein the first predetermined number is four, the second predetermined number is one, the third predetermined number is zero point five, the first resistance is a first resistance required for voltage division according to the first voltage division method, and in the first gray scale range, a resistance value of the first resistance adjacent to the low gray scale is linearly increased or linearly decreased toward a resistance value of the first resistance adjacent to the high gray scale in the first resistance corresponding to each gray scale.
5. The utility model provides a sequential control chip, its characterized in that sequential control chip includes a plurality of binding point voltage receiving terminals and a plurality of grey scale voltage output end, and every binding point voltage receiving terminal is used for receiving a binding point voltage, and the binding point voltage diverse that every binding point voltage receiving terminal received, the binding point voltage corresponds with the voltage in the preset voltage-luminance curve that shows when liquid crystal display panel shows predetermined luminance, just sequential control chip carries out the partial pressure with received binding point voltage when: dividing voltage according to a sixth voltage dividing method corresponding to a fourth gray scale range to obtain A gray scale voltages corresponding to a fourth gray scale range, dividing voltage according to a seventh voltage dividing method corresponding to a fifth gray scale range to obtain B gray scale voltages corresponding to a fifth gray scale range, dividing voltage according to an eighth voltage dividing method corresponding to a sixth gray scale range to obtain C gray scale voltages corresponding to the sixth gray scale range, wherein the gray scale in the fourth gray scale range is smaller than the gray scale in the fifth gray scale range, the gray scale in the fifth gray scale range is smaller than the gray scale in the sixth gray scale range, the number of resistors corresponding to each gray scale is a fourth preset number when voltage division is performed according to the sixth voltage dividing method, the number of resistors corresponding to each gray scale is a fifth preset number when voltage division is performed according to the seventh voltage dividing method, and the number of resistors corresponding to each gray scale is a sixth preset number when voltage division is performed according to the eighth voltage dividing method, the fourth preset number is greater than the fifth preset number, the fourth preset number is greater than the sixth preset number, A, B and C are positive integers, and A + B + C is equal to the preset number;
a third transition gray scale range is arranged between the fourth gray scale range and the fifth gray scale range, a fourth transition gray scale range is arranged between the fifth gray scale range and the sixth gray scale range, wherein the gray scale in the third transition gray scale range is larger than the gray scale in the fourth gray scale range, the gray scale in the third transition gray scale range is smaller than the gray scale in the fifth gray scale range, the gray scale in the fourth transition gray scale range is larger than the gray scale in the fifth gray scale range, and the gray scale in the fourth transition gray scale range is smaller than the gray scale in the sixth gray scale range;
dividing voltage in a third transition gray scale range according to a ninth voltage dividing mode, wherein when voltage is divided according to the ninth voltage dividing mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the third transition gray scale range: the number of the resistors corresponding to the closest gray scale of the fourth gray scale range is greater than the number of the resistors corresponding to the closest gray scale of the fifth gray scale range;
dividing voltage in a fourth transition gray scale range according to a tenth voltage mode, wherein when voltage is divided according to the tenth voltage mode, the number of the resistors corresponding to the low gray scale is greater than or equal to the number of the resistors corresponding to the high gray scale, and in the fourth transition gray scale range: the number of the resistors corresponding to the closest gray scale of the fifth gray scale range is larger than the number of the resistors corresponding to the closest gray scale of the sixth gray scale range.
6. The timing control chip of claim 5, wherein the fourth gray scale range, the fifth gray scale range and the sixth gray scale range are three consecutive gray scale ranges.
7. The timing control chip according to claim 6, wherein the fourth predetermined number is four, the fifth predetermined number is one, the sixth predetermined number is zero point five, and the resistors required for voltage division according to the sixth voltage division manner are fourth resistors, and the resistance values of the fourth resistors are the same.
8. The timing control chip according to claim 6, wherein the fourth predetermined number is four, the fifth predetermined number is one, the sixth predetermined number is zero point five, the resistor required for voltage division according to the sixth voltage division manner is a fourth resistor, and in the fourth gray scale range, a resistance value of the fourth resistor adjacent to the low gray scale is linearly increased or linearly decreased toward a resistance value of the fourth resistor adjacent to the high gray scale in the fourth resistor corresponding to each gray scale.
9. A liquid crystal display device, wherein the liquid crystal display device comprises the gamma chip of any one of claims 1 to 4 or the timing control chip of any one of claims 5 to 8.
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| CN108597447A (en) * | 2018-07-09 | 2018-09-28 | 武汉华星光电半导体显示技术有限公司 | A kind of adjustment method and device of display panel gray scale voltage |
| CN109584818B (en) * | 2018-12-12 | 2020-07-10 | 武汉华星光电半导体显示技术有限公司 | Gamma voltage division circuit, voltage regulation method and liquid crystal display device |
| CN109346025A (en) * | 2018-12-18 | 2019-02-15 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display device |
| CN109509462B (en) * | 2019-01-21 | 2020-06-30 | 深圳市华星光电半导体显示技术有限公司 | Brightness adjusting method and device under panel energy-saving mode |
| CN110767138B (en) * | 2019-01-31 | 2020-12-04 | 昆山国显光电有限公司 | Gamma adjusting method and device for display panel and display equipment |
| CN110021267B (en) * | 2019-03-07 | 2021-01-26 | 京东方科技集团股份有限公司 | Method and device for compensating brightness uniformity of display panel |
| CN110570804B (en) * | 2019-09-12 | 2023-04-28 | 成都辰显光电有限公司 | Driving device and driving method of display panel and display device |
| CN111028763B (en) * | 2020-01-02 | 2022-10-11 | 昆山国显光电有限公司 | Gamma reference voltage adjusting method, adjusting circuit and display panel |
| CN115206226B (en) * | 2022-09-07 | 2023-01-24 | 惠科股份有限公司 | Display driving circuit and display panel |
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