CN103943088A - Gamma voltage adjusting device of display panel and display device of display panel - Google Patents
Gamma voltage adjusting device of display panel and display device of display panel Download PDFInfo
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- 230000005251 gamma ray Effects 0.000 claims description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 4
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Abstract
The invention discloses a gamma voltage adjusting device of a display panel and a display device of the display panel. Due to the fact that for each display area of the display panel, a target gamma voltage is generated through level shifting on a gamma voltage adjusting circuit according to a preset voltage level shifting amplitude value, for multiple display areas, different in Vcom voltage, in a large-sized display panel, the gamma voltage of each display area can be adjusted according to the preset voltage level shifting amplitude value to reach the target gamma voltage; in this way, the problem that because the Vcom voltage is not even, a display image is not even is reduced.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a gamma voltage regulator of a display panel and a display device.
Background
The Gamma voltage generating circuit is used for setting Gamma voltage according to the Gamma curve required by the LCD as the voltage for gray scale display of the TFT LCD. The Gamma voltages are used for converting digital signals generated by the time schedule controller into analog signals corresponding to gray scale voltages under the action of a digital-to-analog converter of the source driver and inputting the analog signals into the liquid crystal display panel.
The liquid crystal display realizes image display by gray scale voltage and common (Vcom) voltage input by the source driver, the gray scale voltage is mainly determined by Gamma voltage and corresponding gray scale Bit, the gray scale Bit is a fixed value, and only the Gamma voltage is changed when the gray scale voltage is required to be changed, so once the Gamma voltage and the Vcom voltage of the liquid crystal display are fixed, the display effect of the whole screen of the liquid crystal display is fixed. However, in a large-sized lcd, the Vcom voltage distribution is not uniform, and the non-uniform Vcom voltage distribution will affect the quality of the display image of the lcd, so that the lcd will have a non-uniform image display.
Disclosure of Invention
The embodiment of the invention provides a gamma voltage regulating device of a display panel and the display device, which are used for solving the problem of uneven picture display of a large-size display panel caused by uneven public voltage distribution.
The gamma voltage regulator of a display panel provided by the embodiment of the invention, the display panel is divided into at least two display areas, and the gamma voltage regulator comprises: source drivers in one-to-one correspondence with respective display regions of the display panel, and a gamma voltage adjusting circuit for supplying a target gamma voltage to each of the source drivers; wherein,
the target gamma voltage is generated after the gamma voltage regulating circuit performs voltage translation regulation according to a preset voltage translation amplitude value.
According to the gamma voltage regulating device provided by the embodiment of the invention, the gamma voltage regulating circuit can be subjected to translation regulation according to the preset voltage translation amplitude value to generate the target gamma voltage aiming at each display area of the display panel. Therefore, for a plurality of display areas with inconsistent Vcom voltages in a large-size display panel, the gamma voltage of each display area can be respectively adjusted according to the preset voltage translation amplitude value to reach the target gamma voltage, so that the problem of uneven display pictures caused by uneven Vcom voltages is reduced.
Preferably, in order to facilitate implementation, in the gamma voltage regulating device according to an embodiment of the present invention, the gamma voltage regulating circuit includes: first gamma voltage generating circuits corresponding to the source drivers one to one, and voltage shift control circuits corresponding to the first gamma voltage generating circuits one to one; wherein,
the voltage translation control circuit is used for carrying out voltage translation regulation on the corresponding first gamma voltage generation circuit according to a preset voltage translation amplitude value so that the first gamma voltage generation circuit generates a target gamma voltage;
the first gamma voltage generation circuit is used for generating target gamma voltages under the regulation of the corresponding voltage translation control circuit and outputting the target gamma voltages to the corresponding source drivers.
Preferably, in order to facilitate implementation, in the gamma voltage adjusting apparatus provided in an embodiment of the present invention, each of the first gamma voltage generating circuits specifically includes: the gamma correction circuit comprises a resistor string consisting of a plurality of resistor units connected in series, and a voltage output end positioned between every two adjacent resistor units and used for outputting a target gamma voltage;
each of the voltage translation control circuits specifically includes: the first constant current source is used for providing stable current for the plurality of resistor units which are connected in series, the first resistor unit which is connected in series between one end of the resistor string of the corresponding first gamma voltage generating circuit and the first constant current source and has an adjustable resistance value, and the second resistor unit which is connected in series between the other end of the resistor string of the corresponding first gamma voltage generating circuit and the grounding end and has an adjustable resistance value.
Preferably, in order to facilitate implementation, in the gamma voltage regulating device according to an embodiment of the present invention, the gamma voltage regulating circuit includes: a second gamma voltage generation circuit, a gamma voltage translation circuit corresponding to each source driver one by one; wherein,
the second gamma voltage generating circuit is used for providing initial gamma voltages to the corresponding gamma voltage translation circuit;
the gamma voltage translation circuit is used for receiving the initial gamma voltage, performing voltage translation adjustment on the initial gamma voltage according to the preset voltage translation amplitude value to generate a corresponding target gamma voltage, and outputting the target gamma voltage to the corresponding source driver.
Preferably, in order to facilitate implementation, in the gamma voltage adjusting apparatus provided in the embodiment of the present invention, the second gamma voltage generating circuits correspond to the gamma voltage shifting circuits one to one.
Alternatively, for convenience of implementation, in the gamma voltage adjusting apparatus provided in the embodiment of the present invention, the second gamma voltage generating circuit corresponds to each of the gamma voltage shifting circuits.
Preferably, in order to facilitate implementation, in the gamma voltage adjusting apparatus provided in an embodiment of the present invention, the second gamma voltage generating circuit includes: the gamma-ray source comprises a resistor string consisting of a plurality of resistor units connected in series, a second constant current source for providing stable current for the resistor string, and a voltage output end positioned between every two adjacent resistor units and used for outputting initial gamma voltage; wherein,
one end of the resistor string of the second gamma voltage generating circuit is connected with the second constant current source, and the other end of the resistor string of the second gamma voltage generating circuit is grounded.
Preferably, in order to facilitate implementation, in the gamma voltage adjusting apparatus provided in an embodiment of the present invention, each of the gamma voltage level shifting circuits specifically includes: the gamma voltage translation sub-circuits correspond to the voltage output ends of the corresponding second gamma voltage generation circuits one by one;
each gamma voltage translation sub-circuit specifically comprises: the amplifier comprises a first resistance unit with adjustable resistance and a second resistance unit with adjustable resistance; wherein,
one end of the first resistance unit is grounded, and the other end of the first resistance unit is connected with a negative phase signal input end of the amplifier and one end of the second resistance unit; and the positive phase signal input end of the amplifier is connected with the voltage output end of the corresponding second gamma voltage generation circuit, and the signal output end of the amplifier is connected with the corresponding source driver and the other end of the second resistor unit.
The display device provided by the embodiment of the invention comprises a display panel, wherein the display panel is divided into at least two display areas, and the display device further comprises the gamma voltage regulating device of any display panel provided by the embodiment of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a gamma voltage regulator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gamma voltage regulating circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a gamma voltage regulating circuit according to an embodiment of the present invention;
FIG. 4 is a third schematic diagram of a gamma voltage regulating circuit according to an embodiment of the present invention;
FIG. 5a is a fourth schematic diagram of a gamma voltage regulating circuit according to an embodiment of the present invention;
FIG. 5b is a fifth schematic diagram of a gamma voltage regulating circuit according to an embodiment of the present invention.
Detailed Description
The gamma voltage adjusting device of a display panel and a display device according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a gamma voltage regulator of a display panel according to an embodiment of the present invention is a gamma voltage regulator of a display panel, where the display panel is divided into at least two display regions 100, and the gamma voltage regulator includes: source drivers 200 corresponding to respective display regions 100 of the display panel one to one, and a gamma voltage adjusting circuit 300 for supplying a target gamma voltage to the respective source drivers 200; wherein,
the target gamma voltage is generated after the gamma voltage adjusting circuit 300 performs voltage shift adjustment according to a preset voltage shift amplitude value.
According to the gamma voltage regulating device provided by the embodiment of the invention, the gamma voltage regulating circuit can be subjected to translation regulation according to the preset voltage translation amplitude value to generate the target gamma voltage aiming at each display area of the display panel. Therefore, for a plurality of display areas with inconsistent Vcom voltages in a large-size display panel, the gamma voltage of each display area can be respectively adjusted according to the preset voltage translation amplitude value to reach the target gamma voltage, so that the problem of uneven display pictures caused by uneven Vcom voltages is reduced.
In particular, in the gamma voltage adjusting apparatus provided by the embodiment of the invention, the display panel can be divided into a plurality of display regions according to the uniformity of the Vcom voltage in the display panel, and the worse the uniformity of the Vcom voltage in the display panel is, the more the number of the display regions need to be divided is. Specifically, the number of the divided display regions may be determined according to actual conditions. For convenience of describing the gamma voltage adjusting apparatus according to the embodiment of the present invention, fig. 1, 2 and 4 are all described by taking an example of dividing the display panel into 4 display regions.
Specifically, in implementation, the preset voltage translation amplitude value may be obtained in advance through experiments. Specifically, the common voltage of one of the display regions of the display panel is used as a reference common voltage, the common voltages of the other display regions in the display panel are compared with the reference common voltage, and according to the voltage difference between the common voltage of the other display regions and the reference common voltage, a voltage translation amplitude value required when the gamma voltage applied to the source driver corresponding to the other display regions reaches a target gamma voltage (i.e., a gamma voltage value corresponding to the minimum flicker of the entire display panel) can be obtained, and the voltage translation amplitude value is a preset voltage translation amplitude value. In this way, except for the display area in which the common voltage is selected as the reference common voltage, the other display areas of the display panel correspond to one preset voltage translation amplitude value respectively.
Or, in specific implementation, a reference common voltage may be set, the common voltage of each display area of the display panel is compared with the reference common voltage, and a voltage translation amplitude value required when the gamma voltage applied to the source driver corresponding to each display area reaches a target gamma voltage (i.e., a gamma voltage value corresponding to a minimum flicker of the entire display panel) is obtained according to a voltage difference between the common voltage of each display area and the reference common voltage, where the voltage translation amplitude value is a preset voltage translation amplitude value. Thus, each display area of the display panel corresponds to one preset voltage translation amplitude value.
Preferably, in the gamma voltage regulating device according to the embodiment of the present invention, as shown in fig. 2, the gamma voltage regulating circuit 300 specifically includes: first gamma voltage generation circuits 310 corresponding to the source drivers 200 one to one, and voltage shift control circuits 320 corresponding to the first gamma voltage generation circuits 310 one to one; wherein,
the voltage translation control circuit 320 is configured to perform voltage translation adjustment on the corresponding first gamma voltage generation circuit 310 according to a preset voltage translation amplitude value, so that the first gamma voltage generation circuit 310 generates a target gamma voltage;
the first gamma voltage generation circuit 310 serves to generate a target gamma voltage under the regulation of the corresponding voltage shift control circuit 320 and output the target gamma voltage to the corresponding source driver 200.
Preferably, in the gamma voltage adjusting apparatus provided in the embodiment of the present invention, as shown in fig. 3, each of the first gamma voltage generating circuits 310 specifically includes: a resistor string composed of a plurality of resistor units R connected in series, and a voltage output terminal 311 for outputting a target gamma voltage between each adjacent two resistor units R;
each voltage translation control circuit 320 specifically includes: the first constant current source 321 is used for providing a stable current for the plurality of resistor units R connected in series, the first resistor unit R1 with an adjustable resistance value is connected in series between one end of the resistor string of the corresponding first gamma voltage generating circuit 310 and the first constant current source 321, and the second resistor unit R2 with an adjustable resistance value is connected in series between the other end of the resistor string of the corresponding first gamma voltage generating circuit 310 and the ground terminal GND.
Alternatively, preferably, in the gamma voltage regulating device provided in the embodiment of the present invention, as shown in fig. 4, the gamma voltage regulating circuit specifically includes: a second gamma voltage generating circuit 330, and gamma voltage shifting circuits 340 corresponding to the source drivers 200 one by one; wherein,
a second gamma voltage generating circuit 330 for providing the initial gamma voltage to the corresponding gamma voltage shifting circuit 340;
the gamma voltage translation circuit 340 is configured to receive an initial gamma voltage, perform voltage translation adjustment on the initial gamma voltage according to a preset voltage translation amplitude value to generate a corresponding target gamma voltage, and output the target gamma voltage to the corresponding source driver 200.
Preferably, in the gamma voltage adjusting apparatus provided in the embodiment of the invention, as shown in fig. 5a, the second gamma voltage generating circuits 330 may correspond to the gamma voltage shifting circuits 340 one by one, that is, one gamma voltage shifting circuit 340 corresponds to one second gamma voltage generating circuit 330.
Of course, in a specific implementation, in the gamma voltage adjusting apparatus provided in the embodiment of the invention, as shown in fig. 5b, the second gamma voltage generating circuit 330 may also correspond to each gamma voltage translation circuit 340, that is, the second gamma voltage generating circuit 330 provides the initial gamma voltage to each gamma voltage translation circuit 340.
Preferably, in the gamma voltage adjusting apparatus according to the embodiment of the present invention, as shown in fig. 5a and 5b, the second gamma voltage generating circuit 330 specifically includes: a resistor string composed of a plurality of resistor units R connected in series, a second constant current source 331 for supplying a stable current to the resistor string, and a voltage output terminal 332 for outputting an initial gamma voltage between each adjacent two resistor units R; wherein,
one end of the resistor string of the second gamma voltage generating circuit 330 is connected to the second constant current source 331, and the other end of the corresponding resistor string of the second gamma voltage generating circuit 330 is grounded.
Further, in the gamma voltage adjusting apparatus provided in the embodiment of the present invention, as shown in fig. 5a and 5b, each gamma voltage translation circuit 340 specifically includes: gamma voltage shifting sub-circuits 341 corresponding one-to-one to the voltage output terminals 332 of the corresponding second gamma voltage generating circuits 330;
each gamma voltage translation sub-circuit 341 specifically includes: an amplifier 3410, a first resistance unit R1 whose resistance is adjustable and a second resistance unit R2 whose resistance is adjustable; wherein,
the first resistance unit R1 has one end connected to the GND and the other end connected to the negative phase signal input terminal 3411 of the amplifier 3410 and one end of the second resistance unit R2; the non-inverting signal input terminal 3412 of the amplifier 3410 is connected to the corresponding voltage output terminal 332 of the second gamma voltage generating circuit 330, and the signal output terminal 3413 of the amplifier 3410 is connected to the other end of the corresponding source driver 200 and the second resistance unit R2.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises a display panel, wherein the display panel is divided into at least two display areas, and the display device further comprises any one of the gamma voltage adjusting devices of the display panel provided by the embodiment of the invention. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The implementation of the display device can refer to the above-mentioned gamma voltage adjusting device of the display panel, and repeated descriptions are omitted.
According to the gamma voltage regulating device of the display panel and the display device, provided by the embodiment of the invention, the gamma voltage regulating circuit can be subjected to translation regulation according to the preset voltage translation amplitude value to generate the target gamma voltage aiming at each display area of the display panel. Therefore, for a plurality of display areas with inconsistent Vcom voltages in a large-size display panel, the gamma voltage of each display area can be respectively adjusted according to the preset voltage translation amplitude value to reach the target gamma voltage, so that the problem of uneven display pictures caused by uneven Vcom voltages is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A gamma voltage adjusting apparatus of a display panel, the display panel being divided into at least two display regions, the gamma voltage adjusting apparatus comprising: source drivers in one-to-one correspondence with respective display regions of the display panel, and a gamma voltage adjusting circuit for supplying a target gamma voltage to each of the source drivers; wherein,
the target gamma voltage is generated after the gamma voltage regulating circuit performs voltage translation regulation according to a preset voltage translation amplitude value.
2. The gamma voltage regulating device of claim 1, wherein the gamma voltage regulating circuit comprises: first gamma voltage generating circuits corresponding to the source drivers one to one, and voltage shift control circuits corresponding to the first gamma voltage generating circuits one to one; wherein,
the voltage translation control circuit is used for carrying out voltage translation regulation on the corresponding first gamma voltage generation circuit according to a preset voltage translation amplitude value so that the first gamma voltage generation circuit generates a target gamma voltage;
the first gamma voltage generation circuit is used for generating target gamma voltages under the regulation of the corresponding voltage translation control circuit and outputting the target gamma voltages to the corresponding source drivers.
3. The gamma voltage regulating device of claim 2, wherein each of the first gamma voltage generating circuits comprises: the gamma correction circuit comprises a resistor string consisting of a plurality of resistor units connected in series, and a voltage output end positioned between every two adjacent resistor units and used for outputting a target gamma voltage;
each of the voltage translation control circuits specifically includes: the first constant current source is used for providing stable current for the plurality of resistor units which are connected in series, the first resistor unit which is connected in series between one end of the resistor string of the corresponding first gamma voltage generating circuit and the first constant current source and has an adjustable resistance value, and the second resistor unit which is connected in series between the other end of the resistor string of the corresponding first gamma voltage generating circuit and the grounding end and has an adjustable resistance value.
4. The gamma voltage regulating device of claim 1, wherein the gamma voltage regulating circuit comprises: a second gamma voltage generating circuit and a gamma voltage shifting circuit corresponding to each source driver one to one; wherein,
the second gamma voltage generating circuit is used for providing initial gamma voltages to the corresponding gamma voltage translation circuit;
the gamma voltage translation circuit is used for receiving the initial gamma voltage, performing voltage translation adjustment on the initial gamma voltage according to the preset voltage translation amplitude value to generate a corresponding target gamma voltage, and outputting the target gamma voltage to the corresponding source driver.
5. The gamma voltage adjusting apparatus of claim 4, wherein the second gamma voltage generating circuits correspond to the gamma voltage shifting circuits one to one.
6. The gamma voltage regulator of claim 4, wherein the second gamma voltage generating circuit corresponds to each of the gamma voltage shifting circuits.
7. The gamma voltage regulator of claim 5 or 6, wherein the second gamma voltage generating circuit comprises: the gamma-ray source comprises a resistor string consisting of a plurality of resistor units connected in series, a second constant current source for providing stable current for the resistor string, and a voltage output end positioned between every two adjacent resistor units and used for outputting initial gamma voltage; wherein,
one end of the resistor string of the second gamma voltage generating circuit is connected with the second constant current source, and the other end of the resistor string of the second gamma voltage generating circuit is grounded.
8. The gamma voltage regulator of claim 7, wherein each of the gamma voltage translation circuits comprises: the gamma voltage translation sub-circuits correspond to the voltage output ends of the corresponding second gamma voltage generation circuits one by one;
each gamma voltage translation sub-circuit specifically comprises: the amplifier comprises a first resistance unit with adjustable resistance and a second resistance unit with adjustable resistance; wherein,
one end of the first resistance unit is grounded, and the other end of the first resistance unit is connected with a negative phase signal input end of the amplifier and one end of the second resistance unit; and the positive phase signal input end of the amplifier is connected with the voltage output end of the corresponding second gamma voltage generation circuit, and the signal output end of the amplifier is connected with the corresponding source driver and the other end of the second resistor unit.
9. A display device comprising a display panel divided into at least two display regions, the display device further comprising a gamma voltage adjusting device of the display panel according to any one of claims 1 to 8.
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