CN104157251B - A kind of gamma voltage control method, gamma voltage setting device and display unit - Google Patents
A kind of gamma voltage control method, gamma voltage setting device and display unit Download PDFInfo
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- CN104157251B CN104157251B CN201410360935.0A CN201410360935A CN104157251B CN 104157251 B CN104157251 B CN 104157251B CN 201410360935 A CN201410360935 A CN 201410360935A CN 104157251 B CN104157251 B CN 104157251B
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Abstract
The present invention discloses a kind of gamma voltage control method, gamma voltage setting device and display unit, to solve in prior art the problem occurring Greenish and brightness irregularities when the display panels existed shows. Described gamma voltage control method, comprising: obtain a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode; Determining a gain voltage according to described feedback voltage and default common electric voltage, described gain voltage is the difference of described feedback voltage with the common electric voltage preset; Actual gamma reference voltage is determined according to described gain voltage and original gamma reference voltage; Wherein, described actual gamma reference voltage is the alternating component of described gain voltage and the reasonable several times of original gamma reference voltage sum, regulates gamma voltage according to described actual gamma reference voltage.
Description
Technical field
The present invention relates to field of liquid crystal display, particularly relate to a kind of gamma voltage control method, gamma voltage setting device and display unit.
Background technology
Owing to the volume of liquid-crystal display (LiquidCrystalDisplay, LCD) is thin, the advantage of light weight and low electromagnetic, determine widespread use in recent years.
Usual liquid-crystal display is that the liquid crystal capacitance consisted of its pixel electrode, public electrode and liquid crystal layer sandwiched therebetween keeps a gray scale voltage in a certain frame picture, and liquid crystal molecule in liquid crystal layer is rotated, the throughput of control light is with display frame. But the impact by the capacitively coupled signal that liquid-crystal display inside produces, when liquid-crystal display is from a frame picture to next frame screen transition, the current potential of its public electrode easily offsets, and thus produces the phenomenon of partially green (Greenish) and brightness irregularities, affects display effect.
For the problem of the Greenish and brightness irregularities that solve above-mentioned liquid-crystal display, industry provides a kind of and public electropotential is carried out feedback compensation method, with reference to figure 1, is the structural representation of a kind of liquid-crystal display of prior art. This liquid-crystal display 100 comprises liquid crystal panel 101, gate drivers 102, one source driver 103 and a common electric voltage circuit 105. This common electric voltage circuit 105 comprises one for the input terminus 151 of receiving feedback signals and for the output terminal 152 of outputting common voltage. This input terminus 151 and this output terminal 152 are all connected to this liquid crystal panel 101. This liquid crystal panel 101 comprise sweep trace 110 that many parallel interval arrange, many arrange and the concentric line 130 being parallel to each other, many insulate with this sweep trace 110 vertically disposed data line 120 and multiple pixel cells 140 defined by this sweep trace 110 and this data line 120 separation with this sweep trace 110 interval. Wherein, this sweep trace 110 is connected to this gate drivers 102, and this data line 120 is connected to this source electrode driver 103, and these many concentric lines 130 are interconnected at end respectively, and is connected to the output terminal 152 of this common electric voltage circuit 105. This pixel cell 140 comprises thin film transistor 141, pixel electrode 142 and a public electrode 143. The grid of this thin film transistor 141, source electrode and drain electrode are connected respectively to corresponding sweep trace 110, data line 120 and pixel electrode 142. This pixel electrode 142, this public electrode 143 and liquid crystal layer (not shown) sandwiched therebetween form a liquid crystal capacitance 147. This pixel electrode 142, this concentric line 130 and insulation layer (not shown) sandwiched therebetween form a storage capacitors 148 being in parallel with this liquid crystal capacitance 147. This public electrode 143 1 aspect is connected to the input terminus 151 of this common electric voltage circuit 105, in order to this common electric voltage circuit 105 output feedback signal, the output terminal 152 being connected to this common electric voltage circuit 105 on the other hand, in order to receive the common electric voltage that this common electric voltage circuit 105 exports. When this liquid-crystal display 100 by N frame picture to N+l frame screen transition time, this common electric voltage circuit 105 sends common electric voltage and is applied to this public electrode 143 and this concentric line 130 by its output terminal 152. This gate drivers 102 sends multiple sweep signal and is applied to this sweep trace 110 successively so that a line thin film transistor 141 conducting being connected with this sweep trace 110. Data signal is applied to this data line 120 by this source electrode driver 103, and by this thin film transistor 141, this data signal is applied to this pixel electrode 142. Owing to this liquid crystal capacitance 147 discharge and recharge needs certain process, now these liquid crystal capacitance 147 two ends still keep its voltage when this N frame picture, thus cause this liquid crystal capacitance 147 to produce a capacitively coupled signal. This capacitively coupled signal impels the current potential of this public electrode 143 to offset, and the degrees of offset of this public electrode 143 current potential is corresponding to the size of this capacitively coupled signal. The current potential of this public electrode 143 is sampled by this common electric voltage circuit 105 by its input terminus 151, and the result sampled is the feedback signal that this public electrode 143 provides. Common electric voltage is compensated by this common electric voltage circuit 105 according to this feedback signal, and by its output terminal 152, the common electric voltage that obtains after compensating is outputted to this public electrode 143 and this concentric line 130. But, it is that the current potential of this public electrode 143 is supplied to this common electric voltage circuit 105 as feedback signal due to this liquid-crystal display 100, common electric voltage is compensated by this common electric voltage circuit 105 again according to this feedback signal.Therefore, after the common electric voltage obtained after compensation adjustment is outputted to this public electrode 143 by this liquid-crystal display 100, it is the common electric voltage after compensating that the current potential of this public electrode 143 samples sampling result further that obtain, it is as feedback signal and fails correctly to reflect the degrees of offset of this public electrode 143 current potential, thus causes this common electric voltage circuit 105 to fail accurately common electric voltage to be compensated adjustment. Therefore, being regulated by common electric voltage by the feedback signal of public electrode 143 based on above-mentioned, this liquid-crystal display 100 still there will be the serious Greenish of comparison and brightness irregularities phenomenon, and regulating effect is not obvious.
Summary of the invention
It is an object of the invention to provide a kind of gamma voltage control method, gamma voltage setting device and display unit, to solve in prior art the problem that Greenish and brightness irregularities occur when the display panels existed shows.
It is an object of the invention to be achieved through the following technical solutions:
The embodiment of the present invention provides a kind of gamma voltage control method, comprising:
A feedback voltage is obtained by least one collection point being arranged at display panel side end and be electrically connected with public electrode;
Determining a gain voltage according to described feedback voltage and default common electric voltage, described gain voltage is the difference of described feedback voltage with the common electric voltage preset;
Determine actual gamma reference voltage according to described gain voltage and original gamma reference voltage, regulate gamma voltage according to described actual gamma reference voltage; Wherein, described actual gamma reference voltage is the alternating component of described gain voltage and the reasonable several times of original gamma reference voltage sum.
The embodiment of the present invention, according to the feedback voltage of public electrode, regulates gamma voltage, and gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon occurring Greenish and brightness irregularities when display panels shows.
Preferably, display panel being divided at least two regions, each described region comprises described public electrode corresponding to many row pixel of described display panel, and the described public electrode that each described region comprises separately is interconnected;
Lateral edges in region described in each arrange that the described public electrode that comprises with described region is electrically connected at least one described in sampling point; Or, sampling point described at least one arranging at the edge, the left and right sides in described region that the described public electrode comprised with described region is electrically connected respectively.
Preferably, obtain a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode, comprising:
When pixel in each described region shows, by being arranged at the described sampling point of described edges of regions, obtain described feedback voltage by the described public electrode included by described region.
Preferably, regulate gamma voltage according to described actual gamma reference voltage, comprising:
According to described actual gamma reference voltage, regulate the described gamma voltage of described region interior pixel display needed for view data.
Preferably, determine a gain voltage according to described feedback voltage and default common electric voltage, comprising:
Described feedback voltage and described default common electric voltage are inputted respectively two input terminuss of subtraction operation amplifier circuit, by described subtraction operation amplifier circuit, described feedback voltage and described default common electric voltage are carried out computing, export described gain voltage by the output terminal of described subtraction operation amplifier circuit.
Preferably, determine actual gamma reference voltage according to described gain voltage and original gamma reference voltage, comprising:
By described gain voltage after filter capacitor filters, two input terminuss that circuit is amplified in additive operation are inputted respectively with described original gamma reference voltage, amplifying circuit by described additive operation and described gain voltage and described original gamma reference voltage are carried out computing, the output terminal amplifying circuit by described additive operation exports described actual gamma reference voltage.
Preferably, circuit is amplified in described additive operation is that circuit is amplified in anti-phase additive operation.
The useful effect of the embodiment of the present invention is as follows: gather actual common electric voltage as feedback voltage, implement to regulate to gamma voltage according to this feedback voltage, gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon that Greenish and brightness irregularities occur when display panels shows.
The embodiment of the present invention provides a kind of gamma voltage setting device, comprising:
Feedback loop, for obtaining a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode;
First computing unit, for determining a gain voltage according to described feedback voltage and default common electric voltage, described gain voltage is the difference of described feedback voltage with the common electric voltage preset;
2nd computing unit, for determining actual gamma reference voltage according to described gain voltage and original gamma reference voltage, regulates gamma voltage according to described actual gamma reference voltage; Wherein, described actual gamma reference voltage is the alternating component of described gain voltage and the reasonable several times of original gamma reference voltage sum.
Preferably, display panel is divided at least two regions, and each described region comprises described public electrode corresponding to many row pixel of described display panel, and the described public electrode that each described region comprises separately is interconnected;
Described feedback loop comprises: described in each region one lateral edges arrange the described public electrode comprised with described region be electrically connected at least one described in sampling point; Or, the described public electrode comprised with described region arranged respectively at the edge, the left and right sides in described region be electrically connected at least one described in sampling point.
Preferably, described feedback loop, when the pixel in each described region shows, by being arranged at the described sampling point of described edges of regions, obtains described feedback voltage by the described public electrode included by described region.
Preferably, described 2nd computing unit, according to described actual gamma reference voltage, regulates the described gamma voltage of described region interior pixel display needed for view data.
Preferably, described first computing unit, described feedback voltage and described default common electric voltage are inputted respectively two input terminuss of subtraction operation amplifier circuit, by described subtraction operation amplifier circuit, described feedback voltage and described default common electric voltage are carried out computing, export described gain voltage by the output terminal of described subtraction operation amplifier circuit.
Preferably, described 2nd computing unit, by described gain voltage after filter capacitor filters, two input terminuss that circuit is amplified in additive operation are inputted respectively with described original gamma reference voltage, amplifying circuit by described additive operation and described gain voltage and described original gamma reference voltage are carried out computing, the output terminal amplifying circuit by described additive operation exports described actual gamma reference voltage.
Preferably, circuit is amplified in described additive operation is that circuit is amplified in anti-phase additive operation.
The useful effect of the embodiment of the present invention is as follows: gather actual common electric voltage as feedback voltage, implement to regulate to gamma voltage according to this feedback voltage, gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon that Greenish and brightness irregularities occur when display panels shows.
The embodiment of the present invention provides a kind of display unit, comprise gamma voltage generator, also comprise the described gamma voltage setting device that as above embodiment provides, described gamma voltage setting device is coupled to described gamma voltage generator, utilizes the gamma voltage that actual gamma reference voltage regulates described gamma voltage generator to export.
The useful effect of the embodiment of the present invention is as follows: gather actual common electric voltage as feedback voltage, implement to regulate to gamma voltage according to this feedback voltage, gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon that Greenish and brightness irregularities occur when display panels shows.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of prior art liquid-crystal display;
The schema of a kind of gamma voltage control method that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of the concrete subtraction operation amplifier circuit that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram of the concrete anti-phase additive operation amplification circuit that Fig. 4 provides for the embodiment of the present invention;
The structural representation of a kind of gamma voltage setting device that Fig. 5 provides for the embodiment of the present invention;
The principle schematic generating gamma voltage according to actual gamma reference voltage that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description, the process that realizes of the embodiment of the present invention is described in detail. It is noted that same or similar label represents same or similar element or has element that is identical or similar functions from start to finish. It is exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and limitation of the present invention can not be interpreted as.
Embodiment one
See Fig. 2, the embodiment of the present invention provides a kind of gamma voltage control method, comprising:
201, obtain a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode.
In the present embodiment, it is possible to preselected display panel is divided at least one region, each region comprises public electrode corresponding to many row pixel of display panel. Such as:
Display panel is divided at least two regions, and each region comprises public electrode corresponding to many row pixel of display panel, and the public electrode that each region comprises separately is interconnected;
A lateral edges in each region arranges at least one sampling point that the public electrode comprised with region is electrically connected; Or, at least one sampling point that the public electrode comprised with region is electrically connected is set respectively at the edge, the left and right sides in region. In this kind of situation, when the pixel in each region shows, by being arranged at the sampling point of edges of regions, obtain feedback voltage by the public electrode included by region.
202, determine a gain voltage according to feedback voltage and default common electric voltage, gain voltage is the difference of feedback voltage with the common electric voltage preset. In the present embodiment, it is possible to use feedback voltage and default common electric voltage are carried out computing by subtraction operation amplifier circuit, it is determined that gain voltage.
Preferably, determine a gain voltage according to feedback voltage and default common electric voltage, comprising:
Feedback voltage and default common electric voltage are inputted respectively two input terminuss of subtraction operation amplifier circuit, by subtraction operation amplifier circuit, feedback voltage and default common electric voltage is carried out computing, by the output terminal output gain voltage of subtraction operation amplifier circuit.
For the ease of understanding, as Fig. 3 illustrates a kind of concrete subtraction operation amplifier circuit, comprise the first input terminus 301, the 2nd input terminus 302 and output terminal 303, by the first input terminus 301 input feedback voltage, default common electric voltage is inputted by the 2nd input terminus 302, the two carries out amplifying computing through amplifier 304, and when resistance R1, R2, R3 and R4 are all equal, the gain voltage that output terminal 303 exports is the difference of feedback voltage with the common electric voltage preset.
203, determine actual gamma reference voltage according to gain voltage and original gamma reference voltage, regulate gamma voltage according to actual gamma reference voltage; Wherein, actual gamma reference voltage is the alternating component of gain voltage and the reasonable several times of original gamma reference voltage sum. If display area is divided into multiple region, regulates gamma voltage according to actual gamma reference voltage, comprising: according to actual gamma reference voltage, regulate the gamma voltage of this region interior pixel display needed for view data. It is described with a specific embodiment, as follows:
As shown in Figure 6 according to actual gamma reference voltage GREF generate gamma voltage GMA1, GMA2 ... the principle schematic of GMA17 and GMA18, wherein resistance R111, R112 and electric capacity C1 forms the 1st dividing potential drop circuit, resistance R113, R114 and electric capacity C2 forms the 2nd dividing potential drop circuit ... resistance R133, R134 and electric capacity C17 group the 17th dividing potential drop circuit, resistance R135, R136 and electric capacity C18 group the 18th dividing potential drop circuit, by pre-setting resistance R111, R112, R113, R114 ... R133, R134, the resistance value of R135 and R136, make the gamma voltage GMA1 of output, GMA2 ... GMA17 with GMA18 is different. concrete resistance R111, R112, R113, R114 ... the setting of the resistance value of R133, R134, R135 and R136, is as the criterion with the design of the dividing potential drop of reality, does not repeat them here. it should be noted that, the principle schematic of the generation gamma voltage shown in Fig. 6 is only to illustrate, the present invention is not as limit.
Preferably, determine actual gamma reference voltage according to gain voltage and original gamma reference voltage, comprising:
By gain voltage after filter capacitor filters, two input terminuss that circuit is amplified in additive operation are inputted respectively with original gamma reference voltage, amplifying circuit by additive operation and gain voltage and original gamma reference voltage are carried out computing, the output terminal amplifying circuit by additive operation exports actual gamma reference voltage. In the present embodiment, by filter capacitor, gain voltage is carried out filtering, it is possible to remove the direct component in gain voltage.
Preferably, circuit is amplified in additive operation is that circuit is amplified in anti-phase additive operation.
For the ease of understanding, as Fig. 4 illustrates that circuit is amplified in a kind of anti-phase additive operation specifically, comprise the first input terminus 401, the 2nd input terminus 402 and output terminal 403, by the gain voltage after the first input terminus 401 input filter, original gamma reference voltage is inputted by the 2nd input terminus 402, the two inputs through amplifier 404 backward end and carries out amplifying computing, and the end in the same way of amplifier 404 is by a resistance R8 ground connection; The actual gamma reference voltage that output terminal 403 exports is relevant with the resistance sizes of resistance R5, R6 and R7, meets formula 1:
Vout=-R7* (V401/R5+V402/R6)(1)
Wherein, VoutFor actual gamma reference voltage; V401For filtered gain voltage; V402For original gamma reference voltage.
It should be noted that, gain voltage V401With original gamma reference voltage V402It is the voltage of alternating current obtained after filter capacitor filtering, the actual gamma reference voltage V therefore obtained by formula 1outReality is positive voltage. Meanwhile, usually making resistance R5 equal with resistance R6, the ratio of adjustment R7 and resistance R5 and resistance R6, namely can adjust actual gamma reference voltage VoutCompare gain voltage V401With original gamma reference voltage V402The multiple relation of sum. Such as, adjustment R7/R5 and R7/R6 is equal and is between 2-4, then actual gamma reference voltage VoutCompare gain voltage V401With original gamma reference voltage V402It is between 2-4 that the multiple of sum closes.
The useful effect of the embodiment of the present invention is as follows: gather actual common electric voltage as feedback voltage, implement to regulate to gamma voltage according to this feedback voltage, gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon that Greenish and brightness irregularities occur when display panels shows.
Implement two
See Fig. 5, the embodiment of the present invention provides a kind of gamma voltage setting device 500, comprising:
Feedback loop 501, for obtaining a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode. In the present embodiment, in order to improve sharpness of regulation, display panel can be divided at least one region, and each region comprises public electrode corresponding to many row pixel of display panel.
Preferably, display panel is divided at least two regions, and each region comprises public electrode corresponding to many row pixel of display panel, and the public electrode that each region comprises separately is interconnected. In this kind of situation, feedback loop 501 comprises: at least one sampling point that the public electrode comprised with region that the lateral edges in each region is arranged is electrically connected; Or, at least one sampling point that the public electrode comprised with region arranged respectively at the edge, the left and right sides in region is electrically connected. When the pixel of feedback loop 501 in each region shows, by being arranged at the sampling point of edges of regions, obtain feedback voltage by the public electrode included by region.
First computing unit 502, for determining a gain voltage according to feedback voltage and default common electric voltage, gain voltage is the difference of feedback voltage with the common electric voltage preset.
2nd computing unit 503, for determining actual gamma reference voltage according to gain voltage and original gamma reference voltage, regulates gamma voltage according to actual gamma reference voltage; Wherein, actual gamma reference voltage is the alternating component with gain voltage and the reasonable several times of original gamma reference voltage sum. When display panel is divided at least two regions, it is preferable that, the 2nd computing unit, according to actual gamma reference voltage, regulates the gamma voltage of this region interior pixel display needed for view data.
Feedback loop 501 comprises: at least one sampling point being electrically connected with public electrode that the lateral edges in each region is arranged; Or, at least one sampling point being electrically connected with public electrode arranged respectively at the edge, the left and right sides in region.
Preferably, first computing unit 502, feedback voltage and default common electric voltage are inputted respectively two input terminuss of subtraction operation amplifier circuit, by subtraction operation amplifier circuit, feedback voltage and default common electric voltage is carried out computing, by the output terminal output gain voltage of subtraction operation amplifier circuit.
Preferably, 2nd computing unit 503, by gain voltage after filter capacitor filters, two input terminuss that circuit is amplified in additive operation are inputted respectively with original gamma reference voltage, amplifying circuit by additive operation and gain voltage and original gamma reference voltage are carried out computing, the output terminal amplifying circuit by additive operation exports actual gamma reference voltage.
Preferably, circuit is amplified in additive operation is that circuit is amplified in anti-phase additive operation.
The useful effect of the embodiment of the present invention is as follows: gather actual common electric voltage as feedback voltage, implement to regulate to gamma voltage according to this feedback voltage, gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon that Greenish and brightness irregularities occur when display panels shows.
Embodiment three
The embodiment of the present invention provides a kind of display unit, comprise gamma voltage generator, also comprise as embodiment three provide gamma voltage setting device, gamma voltage setting device is coupled to gamma voltage generator, utilizes actual gamma reference voltage to regulate the gamma voltage of gamma voltage generator output.
The useful effect of the embodiment of the present invention is as follows: gather actual common electric voltage as feedback voltage, implement to regulate to gamma voltage according to this feedback voltage, gamma voltage is fluctuated with the fluctuation of the common electric voltage of reality, thus reduces the phenomenon that Greenish and brightness irregularities occur when display panels shows.
Obviously, the present invention can be carried out various change and modification and not depart from the spirit and scope of the present invention by the technician of this area. Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these change and modification.
Claims (15)
1. a gamma voltage control method, it is characterised in that, comprising:
A feedback voltage is obtained by least one collection point being arranged at display panel side end and be electrically connected with public electrode;
Determining a gain voltage according to described feedback voltage and default common electric voltage, described gain voltage is the difference of described feedback voltage with the common electric voltage preset;
Determine actual gamma reference voltage according to described gain voltage and original gamma reference voltage, regulate gamma voltage according to described actual gamma reference voltage; Wherein, described actual gamma reference voltage is the alternating component of described gain voltage and the reasonable several times of original gamma reference voltage sum.
2. the method for claim 1, it is characterised in that, described obtain a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode before, also comprise:
Display panel is divided at least two regions, and each described region comprises described public electrode corresponding to many row pixel of described display panel, and the described public electrode that each described region comprises separately is interconnected;
Lateral edges in region described in each arrange that the described public electrode that comprises with described region is electrically connected at least one described in collection point; Or, collection point described at least one arranging at the edge, the left and right sides in described region that the described public electrode comprised with described region is electrically connected respectively.
3. method as claimed in claim 2, it is characterised in that, obtain a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode, comprising:
When pixel in each described region shows, by being arranged at the described collection point of described edges of regions, obtain described feedback voltage by the described public electrode included by described region.
4. method as claimed in claim 2, it is characterised in that, regulate gamma voltage according to described actual gamma reference voltage, comprising:
According to described actual gamma reference voltage, regulate the described gamma voltage of described region interior pixel display needed for view data.
5. method as described in item as arbitrary in Claims 1-4, it is characterised in that, determine a gain voltage according to described feedback voltage and the common electric voltage preset, comprising:
Described feedback voltage and described default common electric voltage are inputted respectively two input terminuss of subtraction operation amplifier circuit, by described subtraction operation amplifier circuit, described feedback voltage and described default common electric voltage are carried out computing, export described gain voltage by the output terminal of described subtraction operation amplifier circuit.
6. method as claimed in claim 5, it is characterised in that, determine actual gamma reference voltage according to described gain voltage and original gamma reference voltage, comprising:
By described gain voltage after filter capacitor filters, two input terminuss that circuit is amplified in additive operation are inputted respectively with described original gamma reference voltage, amplifying circuit by described additive operation and described gain voltage and described original gamma reference voltage are carried out computing, the output terminal amplifying circuit by described additive operation exports described actual gamma reference voltage.
7. method as claimed in claim 6, it is characterised in that, it is that circuit is amplified in anti-phase additive operation that circuit is amplified in described additive operation.
8. a gamma voltage setting device, it is characterised in that, comprising:
Feedback loop, for obtaining a feedback voltage by least one collection point being arranged at display panel side end and be electrically connected with public electrode;
First computing unit, for determining a gain voltage according to described feedback voltage and default common electric voltage, described gain voltage is the difference of described feedback voltage with the common electric voltage preset;
2nd computing unit, for determining actual gamma reference voltage according to described gain voltage and original gamma reference voltage, regulates gamma voltage according to described actual gamma reference voltage; Wherein, described actual gamma reference voltage is the alternating component of described gain voltage and the reasonable several times of original gamma reference voltage sum.
9. device as claimed in claim 8, it is characterised in that, display panel is divided at least two regions, and each described region comprises described public electrode corresponding to many row pixel of described display panel, and the described public electrode that each described region comprises separately is interconnected;
Described feedback loop comprises: described in each region one lateral edges arrange the described public electrode comprised with described region be electrically connected at least one described in collection point; Or, the described public electrode comprised with described region arranged respectively at the edge, the left and right sides in described region be electrically connected at least one described in collection point.
10. device as claimed in claim 9, it is characterized in that, described feedback loop, when the pixel in each described region shows, by being arranged at the described collection point of described edges of regions, obtain described feedback voltage by the described public electrode included by described region.
11. devices as claimed in claim 9, it is characterised in that, described 2nd computing unit, according to described actual gamma reference voltage, regulates the described gamma voltage of described region interior pixel display needed for view data.
Device as described in 12. items as arbitrary in claim 8 or 11, it is characterized in that, described first computing unit, described feedback voltage and described default common electric voltage are inputted respectively two input terminuss of subtraction operation amplifier circuit, by described subtraction operation amplifier circuit, described feedback voltage and described default common electric voltage are carried out computing, export described gain voltage by the output terminal of described subtraction operation amplifier circuit.
13. devices as claimed in claim 12, it is characterized in that, described 2nd computing unit, by described gain voltage after filter capacitor filters, two input terminuss that circuit is amplified in additive operation are inputted respectively with described original gamma reference voltage, amplifying circuit by described additive operation and described gain voltage and described original gamma reference voltage are carried out computing, the output terminal amplifying circuit by described additive operation exports described actual gamma reference voltage.
14. devices as claimed in claim 13, it is characterised in that, it is that circuit is amplified in anti-phase additive operation that circuit is amplified in described additive operation.
15. 1 kinds of display unit, comprise gamma voltage generator, it is characterized in that, also comprise the gamma voltage setting device as described in item as arbitrary in claim 8 to 14, described gamma voltage setting device is coupled to described gamma voltage generator, utilizes the gamma voltage that actual gamma reference voltage regulates described gamma voltage generator to export.
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| CN113160768B (en) * | 2021-04-15 | 2022-08-23 | 惠州市华星光电技术有限公司 | Display panel, control method thereof and storage medium |
| CN114141211B (en) * | 2021-12-16 | 2023-02-17 | 长沙惠科光电有限公司 | Gamma voltage generation circuit, source electrode drive circuit and display panel |
| CN114267280B (en) * | 2021-12-24 | 2023-10-13 | 绵阳惠科光电科技有限公司 | Gamma voltage generation circuit and display device |
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| CN1539135A (en) * | 2001-06-18 | 2004-10-20 | ���ǵ�����ʽ���� | Liquid crystal display |
| CN202258265U (en) * | 2011-09-30 | 2012-05-30 | 北京京东方光电科技有限公司 | Gamma voltage regulating system, driving unit and liquid crystal display |
| CN202454230U (en) * | 2012-03-14 | 2012-09-26 | 京东方科技集团股份有限公司 | Gamma voltage regulator and liquid crystal display |
| CN103943088A (en) * | 2014-04-11 | 2014-07-23 | 京东方科技集团股份有限公司 | Gamma voltage adjusting device of display panel and display device of display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100365496B1 (en) * | 2000-12-15 | 2002-12-18 | 엘지.필립스 엘시디 주식회사 | Liquid Crystal Display Device having a Fine controlling Apparatus |
| KR102018125B1 (en) * | 2012-12-27 | 2019-09-04 | 엘지디스플레이 주식회사 | Device of generating gamma voltage and a display device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1539135A (en) * | 2001-06-18 | 2004-10-20 | ���ǵ�����ʽ���� | Liquid crystal display |
| CN202258265U (en) * | 2011-09-30 | 2012-05-30 | 北京京东方光电科技有限公司 | Gamma voltage regulating system, driving unit and liquid crystal display |
| CN202454230U (en) * | 2012-03-14 | 2012-09-26 | 京东方科技集团股份有限公司 | Gamma voltage regulator and liquid crystal display |
| CN103943088A (en) * | 2014-04-11 | 2014-07-23 | 京东方科技集团股份有限公司 | Gamma voltage adjusting device of display panel and display device of display panel |
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| CN104157251A (en) | 2014-11-19 |
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