CN106847217B - Gamma voltage generation circuit, liquid crystal display device and driving method - Google Patents
Gamma voltage generation circuit, liquid crystal display device and driving method Download PDFInfo
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- CN106847217B CN106847217B CN201710124409.8A CN201710124409A CN106847217B CN 106847217 B CN106847217 B CN 106847217B CN 201710124409 A CN201710124409 A CN 201710124409A CN 106847217 B CN106847217 B CN 106847217B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses gamma voltage generation circuit, liquid crystal display device and driving method, the gamma voltage generation circuit includes: first voltage generation module, for providing at least one first voltage according to supply voltage；Second voltage generation module, for providing at least one second voltage according to the supply voltage；Level switch module, for being converted to switching signal for signal is controlled according to the supply voltage；Switching module, for selecting to export at least one described first voltage or at least one described second voltage as gamma electric voltage according to the switching signal.Pass through the gamma electric voltage under setting different display modes, realize the adjusting to gray scale voltage, so that under same grayscale: the center voltage of the gray scale voltage of wide viewing angle display pattern is less than the center voltage of the gray scale voltage of narrow viewing angle display pattern, to avoid display pattern switching front and back from scintillation occur, the comfort level of user's perception is promoted.
Description
Technical field
The present invention relates to technical field of liquid crystal display, more particularly, to gamma voltage generation circuit, liquid crystal display device
And driving method.
Background technique
Liquid crystal display device is broadly divided into three types on mainstream market at present: twisted-nematic (Twisted Nematic,
TN) type or super twisted nematic (Super Twisted Nematic, STN) type, plane conversion (In-Plane Switching,
IPS) type and vertical orientation (Vertical Alignment, VA) type.
Visual angle (the Hybrid Viewing Angle) type of mixing is that a kind of liquid crystal display of processing is improved on the basis of IPS type
Device.HVA type liquid crystal display device is to control liquid crystal layer by increasing electric field in the color membrane substrates side (CF, ColorFilter)
Liquid crystal molecule rotation, to realize that the image of high quality is shown.HVA type liquid crystal display device is divided into wide viewing angle (Wide
Viewing Angle, WVA) display pattern and narrow viewing angle (Narrow Viewing Angle, NVA) display pattern.
When carrying out the switching of display pattern to liquid crystal display device, it usually will appear scintillation.Confirmed, flashing is existing
As the reason of be: the best center voltage Vcom of gray scale voltage (the positive polarity gray scale voltage and negative polarity ash of corresponding same grayscale
The average value of rank voltage) under WVA display pattern and NVA display pattern be it is inconsistent, under each grayscale, only work as NVA
When the center voltage of display pattern is greater than the center voltage of WVA display pattern, scintillation can just disappear.However, general
In liquid crystal display device, the center voltage under NVA display pattern is usually less than the center voltage being equal under WVA display pattern, and
Gray scale voltage is that voltage generates centered on changeless reference voltage, therefore can not refer to electricity by directly adjusting again
The method of pressure completes the switching of the voltage value of center voltage under different display modes.
In order to solve the above technical problems, a kind of prior art is generated under WVA display pattern using external gamma electric voltage
Circuit, used under NVA display pattern with external gamma electric voltage generative circuit output gamma electric voltage as the reference voltage in
Gamma electric voltage generative circuit is set, the center voltage of the gray scale voltage under NVA display pattern is lifted to greater than WVA display pattern
Under center voltage voltage value, thus solve by display pattern switch caused by scintillation.But due to this existing skill
Art reduces the white state voltage of NVA display pattern, therefore the penetrance of NVA display pattern can decline.Other prior arts are logical
It crosses different using programmable gamma electric voltage generative circuit (Programmable Gamma Generator, P-gamma) generation
Gamma electric voltage realization is to the adjusting of gray scale voltage or by increasing the driving voltage under WVA display pattern to improve display pattern
The scintillation occurred when switching, but the problems such as can also cause some such as split screens or track uneven (Trace Mura).
Therefore, expectation can improve in the case where not generating other problems switches caused flashing now by display pattern
As.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the present invention provides a kind of gamma voltage generation circuit, liquid crystal
Showing device and driving method can improve flashing caused by being switched by display pattern in the case where not generating other problems
Phenomenon.
According to the first aspect of the invention, a kind of gamma voltage generation circuit for plurality of display modes is provided,
It is characterized in that, the gamma voltage generation circuit includes: first voltage generation module, for providing at least one according to supply voltage
A first voltage；Second voltage generation module, for providing at least one second voltage according to the supply voltage；Level conversion
Module, for being converted to switching signal for signal is controlled according to the supply voltage；Switching module, for being believed according to the switching
Number select will at least one described first voltage or at least one described second voltage as gamma electric voltage output.
Preferably, the switching module includes at least one switch unit, and each switch unit receives described in one
First voltage and a second voltage simultaneously select alternative one to export as gamma electric voltage according to the switching signal.
Preferably, each switch unit includes the first transistor and second transistor, in each switch unit
In, the first transistor is connected with the control terminal of the second transistor and receives the switching signal, the first crystal
The input terminal of pipe receives a first voltage corresponding with the switch unit, the input terminal of the second transistor receive and
The corresponding second voltage of the switch unit, the first transistor are connected simultaneously with the output end of the second transistor
Export the gamma electric voltage.
Preferably, the first transistor is one of p-type field-effect tube and N-type field-effect tube, and the second transistor is P
The control terminal of another in type field-effect tube and N-type field-effect tube, the first transistor and the second transistor is grid
The input terminal of pole, the first transistor and the second transistor is source electrode, the first transistor and second crystal
The output end of pipe is drain electrode.
Preferably, the first voltage generation module includes n+1 first be connected between the supply voltage and ground
Resistance, the node between the every two adjacent first resistor export a first voltage, and the second voltage generates
Module includes n+1 second resistance being connected between the supply voltage and ground, the every two adjacent second resistance it
Between node export a second voltage, n be non-zero natural number.
Preferably, the plurality of display modes includes wide viewing angle display pattern and narrow viewing angle display pattern.
According to the second aspect of the invention, a kind of liquid crystal display device for plurality of display modes is provided, comprising: such as
Upper any gamma voltage generation circuit, for providing at least one described gamma under the plurality of display modes respectively
Voltage；Driving circuit, for adjusting gray scale voltage according at least one described gamma electric voltage；Sequence controller, when for providing
Sequential signal is to control the driving circuit；Display panel, for receiving the gray scale voltage according to the different display moulds
The display of formula realization image.
Preferably, the sequence controller provides the control signal.
According to the third aspect of the invention we, a kind of driving of liquid crystal display device for plurality of display modes is additionally provided
Method, comprising: be provided for handing off the control signal of the plurality of display modes；According to the control signal, by first voltage
It is exported with one of second voltage conduct gamma electric voltage；And under each grayscale, adjusted and the grayscale according to the gamma electric voltage
The average voltage of corresponding positive polarity gray scale voltage and negative polarity gray scale voltage.
Preferably, the plurality of display modes includes wide viewing angle display pattern and narrow viewing angle display pattern, in same grayscale
Under, the average voltage of the wide viewing angle display pattern is less than the average voltage of the narrow viewing angle display pattern.
The invention has the advantages that being realized by the gamma electric voltage under setting different display modes to gray scale voltage
It adjusts, so that under same grayscale: the center voltage of the gray scale voltage of wide viewing angle display pattern is less than narrow viewing angle display pattern
The center voltage of gray scale voltage promotes the comfort level of user's perception so that display pattern switching front and back be avoided scintillation occur.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 shows the structural schematic diagram of the gamma voltage generation circuit of first embodiment of the invention.
Fig. 2 shows the structural schematic diagrams of the gamma voltage generation circuit of second embodiment of the invention.
Fig. 3 shows the schematic block diagram of the liquid crystal display device of third embodiment of the invention.
Fig. 4 shows the flow diagram of the driving method of fourth embodiment of the invention.
Specific embodiment
Hereinafter reference will be made to the drawings, and the present invention will be described in more detail.In various figures, identical element is using similar attached
Icon is remembered to indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.In addition, may not show in figure
Certain well known parts out.
Many specific details of the invention, such as structure, material, size, the processing work of device is described hereinafter
Skill and technology, to be more clearly understood that the present invention.But it just as the skilled person will understand, can not press
The present invention is realized according to these specific details.
The embodiment of the present invention is specifically described below by attached drawing.
Fig. 1 shows the structural schematic diagram of the gamma voltage generation circuit of first embodiment of the invention.
As shown in Figure 1, the gamma voltage generation circuit 10 of first embodiment of the invention is single-pass configuration, including the first electricity
Press generation module 11, second voltage generation module 12, level switch module 13 and switching module 14.
First voltage generation module 11 is used for wide viewing angle (WVA) display pattern for providing first voltage WVA_V1, the
Two voltage generation modules 12 are for providing second voltage NVA_V1 for narrow viewing angle (NVA) display pattern.First voltage generates
Module 11 includes two resistance R11 and R12 being connected between supply voltage AVDD and ground, between resistance R11 and resistance R12
First node Q exports first voltage WVA_V1；Second voltage generation module 12 includes being connected between supply voltage AVDD and ground
Two resistance R21 and R22, second node P between resistance R21 and R22 exports second voltage NVA_V1.
Switching module 14 includes the first transistor M1's and second transistor M2, the first transistor M1 and second transistor M2
Control terminal is connected and receives the switching signal VG of the offer of level switch module 13.The input terminal and first voltage of the first transistor M1
First node Q in generation module 11 is connected, for receiving first voltage WVA_V1, the input terminal of second transistor M2 and second
Second node P in voltage generation module 12 is connected, for receiving second voltage NVA_V1, the first transistor M1 and the second crystal
The output end of pipe N1 is connected and exports gamma electric voltage V1.The first transistor M1 is p-type Metal-Oxide Semiconductor field-effect tube
(Metal-oxide Semiconductor Field Effect Transistor, MOSFET), second transistor M2 are N-type
The control terminal of MOSFET, the first transistor M1 and second transistor M2 are grid, input terminal is source electrode, output end is drain electrode.
Level switch module 13 is used to be input to switching module 14 according to control signal HVA and supply voltage AVDD generation
Switching signal VG.The high level voltage for controlling signal HVA is, for example, 3.3V, and low level voltage is, for example, 0.Supply voltage AVDD's
Voltage is, for example, 5V.Control signal HVA can by liquid crystal display device sequence controller (Timing Controller,
TCON it) directly provides, other circuits can also generate the control for controlling level switch module under the control of sequence controller
Signal HVA processed.
Under WVA display pattern, the control signal HVA that level switch module 13 receives is low level.Level conversion mould
Control signal HVA is converted to low level switching signal VG (for example, 0V) by block 13, so that second transistor M2 shutdown, the
One transistor M1 conducting, so that the gamma electric voltage V1 that gamma voltage generation circuit 10 is exported is approximately equal to first voltage WVA_V1.
Driving circuit in liquid crystal display device compensates gray scale voltage according to gamma electric voltage V1, so that gray scale voltage has center
Voltage Vcom_wva=(Vdh_w+Vdl_w)/2, wherein Vdh_w and Vdl_w be respectively under WVA display pattern with same grayscale
Corresponding positive polarity gray scale voltage and negative polarity gray scale voltage.
Under NVA display pattern, control signal HVA that level switch module 13 receives be high level (for example,
3.3V).Control signal HVA is converted to the switching signal VG of high level according to supply voltage AVDD by level switch module 13
(for example, 5V), so that second transistor M2 conducting, the first transistor M1 shutdown, so that gamma voltage generation circuit 10 is exported
Gamma electric voltage V1 be approximately equal to second voltage NVA_V1.Driving circuit in liquid crystal display device is according to gamma electric voltage V1 to grayscale
Voltage compensates so that gray scale voltage have center voltage Vcom_nva=(Vdh_n+Vdl_n)/2, wherein Vdh_n with
Vdl_n is respectively positive polarity gray scale voltage corresponding with same grayscale and negative polarity gray scale voltage under NVA display pattern.
Further, there is scintillation in liquid crystal display device when switching in order to avoid display pattern, produces in gamma electric voltage
It, can be with by adjusting the resistance value of each resistance in first voltage generation module 11 and second voltage generation module 12 in raw circuit 10
It is different to export under different display modes to obtain voltage value different first voltage WVA_V1 and second voltage NVA_V1
Gamma electric voltage V1 is shown so that the center voltage Vcom_wva for meeting the gray scale voltage under wide viewing angle display pattern is less than narrow viewing angle
The condition of the center voltage Vcom_nva of gray scale voltage under mode reaches the scintillation occurred when eliminating switching display pattern
Purpose.
Fig. 2 shows the structural schematic diagrams of the gamma voltage generation circuit of second embodiment of the invention.
As shown in Fig. 2, the gamma voltage generation circuit 100 of second embodiment of the invention is multi-channel structure, including first
Voltage generation module 110, second voltage generation module 120, level switch module 130 and switching module 140.
First voltage generation module 110 is for providing multiple first voltage WVA_V1 to WVA_Vn for wide viewing angle
(WVA) display pattern, second voltage generation module 120 is for providing multiple second voltage NVA_V1 to NVA_Vn for narrow view
Angle (NVA) display pattern.First voltage generation module 110 includes the multiple resistance R1 being connected between supply voltage AVDD and ground
[1] to R1 [n+1], in resistance R1 [1] to resistance R1 [n+1] per two adjacent resistance between node be followed successively by Q [1] to Q
[n], node Q [1] to Q [n] respectively correspond output first voltage WVA_V1 to WVA_Vn；Second voltage generation module 120 includes
Multiple resistance R2 [1] between supply voltage AVDD and ground are connected on to R2 [n+1], it is every in resistance R2 [1] to resistance R2 [n+1]
Node among two adjacent resistance is followed successively by P [1] to P [n], and node P [1] to P [n] respectively corresponds output second voltage
NVA_V1 to NVA_Vn.N is the natural number greater than 1.
Switching module 140 includes multiple switch unit S1 to Sn.Each switch unit includes the first transistor M1 [i] and
Two-transistor M2 [i], i are non-zero and the natural number for being less than or equal to n.The control of the first transistor M1 [i] and second transistor M2 [i]
End processed is connected and receives the switching signal VG that level dress mold changing block 130 provides.By taking switch unit S1 as an example, in switch unit S1
The input terminal of the first transistor M1 [1] is connected with the node Q [1] in first voltage generation module 110, for receiving first voltage
The input terminal of WVA_V1, second transistor M2 [1] are connected with the node P [1] in second voltage generation module 120, for receiving
Second voltage NVA_V1, the first transistor M1 [1] are connected with the output end of second transistor M2 [1] and export gamma electric voltage V1,
Wherein the first transistor M1 [1] is p-type MOSFET, and second transistor M2 [1] is N-type MOSFET, the first transistor M1 [1] and the
The control terminal of two-transistor M2 [1] is grid, input terminal is source electrode, output end is drain electrode.Again by taking switch unit Sn as an example, switching
The input terminal of the first transistor M1 [n] in cell S n is connected with the node Q [n] in first voltage generation module 110, for connecing
Receive first voltage WVA_Vn, the input terminal of second transistor M2 [n] and node P [n] phase in second voltage generation module 120
Even, for receiving second voltage NVA_Vn, the first transistor M1 [n] is connected and exports with the output end of second transistor M2 [n]
Gamma electric voltage Vn, wherein the first transistor M1 [n] is p-type MOSFET, and second transistor M2 [n] is N-type MOSFET, first crystal
The control terminal of pipe M1 [n] and second transistor M2 [n] are grid, input terminal is source electrode, output end is drain electrode.
Level switch module 130 is used to be input to switching module 140 according to control signal HVA and supply voltage AVDD generation
Switching signal VG.The high level voltage for controlling signal HVA is, for example, 3.3V, and low level voltage is, for example, 0.Supply voltage AVDD
Voltage be, for example, 5V.Control signal HVA by liquid crystal display device control circuit provide, such as by liquid crystal display device when
Sequence controller provides.
Under WVA display pattern, the control signal HVA that level switch module 130 receives is low level.Level conversion mould
Control signal HVA is converted to low level switching signal VG (for example, 0V) by block 130, so that owning in switching module 140
Second transistor M2 [i] shutdown, the first transistor M1 [i] conducting of switch unit S1 to Sn, thus gamma voltage generation circuit
The 100 gamma electric voltage V1 to Vn exported are approximately equal to first voltage WVA_V1 to WVA_Vn respectively.Drive in liquid crystal display device
Dynamic circuit compensates gray scale voltage according to gamma electric voltage V1 to Vn, so that gray scale voltage has center voltage Vcom_wva=
(Vdh_w+Vdl_w)/2, wherein Vdh_w and Vdl_w is respectively the positive polarity ash corresponding with same grayscale under WVA display pattern
Rank voltage and negative polarity gray scale voltage.
Under NVA display pattern, control signal HVA that level switch module 130 receives be high level (for example,
3.3V).Control signal HVA is converted to the switching signal VG of high level according to supply voltage AVDD by level switch module 130
(for example, 5V), so that second transistor M2 [i] conducting of all switch unit S1 to Sn, first crystal in switching module 140
Pipe M1 [i] shutdown, so that the gamma electric voltage V1 to Vn that gamma voltage generation circuit 100 is exported is approximately equal to second voltage NVA_V1
To NVA_Vn.Driving circuit in liquid crystal display device compensates gray scale voltage according to gamma electric voltage V1 to Vn, so that grey
Rank voltage has center voltage Vcom_nva=(Vdh_n+Vdl_n)/2, and wherein Vdh_n and Vdl_n is respectively to show mould in NVA
Positive polarity gray scale voltage corresponding with same grayscale and negative polarity gray scale voltage under formula.
Further, there is scintillation in liquid crystal display device when switching in order to avoid display pattern, produces in gamma electric voltage
It, can by adjusting the resistance value of each resistance in first voltage generation module 110 and second voltage generation module 120 in raw circuit 100
The different first voltage of voltage value and second voltage are respectively obtained in the case where the correspondence same grayscale Bu Tong to show
Show and export different gamma electric voltage V1 to Vn under mode, to meet the center voltage of the gray scale voltage under wide viewing angle display pattern
Vcom_wva is less than the condition of the center voltage Vcom_nva of the gray scale voltage under narrow viewing angle display pattern, and it is aobvious to reach elimination switching
The purpose of the scintillation occurred when showing mode.
In above-mentioned first embodiment and second embodiment, the first transistor is p-type MOSFET, and second transistor is N-type
The control terminal of MOSFET, the first transistor and second transistor is grid, input terminal is source electrode, output end is drain electrode.As replacing
The embodiment in generation, the first transistor are N-type MOSFET, and second transistor is p-type MOSFET, and control signal HVA is aobvious in wide viewing angle
Show be under high level, narrow viewing angle display pattern under mode to be low level.Other are with the embodiment of same principle in the present invention
Protection scope in.
In above-mentioned first embodiment and second embodiment, the structure of first voltage generation module and second voltage generation module
It is resistance string.As alternative embodiment, first voltage generation module and second voltage generation module can be that other can
Realize the circuit structure of multivoltage output.
In above-mentioned second embodiment, the switching signal VG of the level switch module output in gamma voltage generation circuit is used for
Control all switch unit S1 to Sn in switching module.It include more as a kind of alternative embodiment, in level switch module
A level conversion unit, multiple level conversion units export multiple switching signals to each switching list in switching module respectively
Member is respectively controlled.
Fig. 3 shows the schematic block diagram of the liquid crystal display device of third embodiment of the invention.
As shown in figure 3, liquid crystal display device 1000 includes gamma voltage generation circuit 1100, driving circuit 1200, timing
Controller 1300 and display panel 1400.Liquid crystal display device 1000 is for example shown with wide viewing angle display pattern and narrow viewing angle
Mode.
The gamma electric voltage that driving circuit 1200 is used to be exported according to gamma voltage generation circuit 1100 adjusts gray scale voltage, and
Gray scale voltage after adjusting is input to display panel 1400, display panel is enabled to realize figure according to different display patterns
The display of picture, sequence controller 1300 provide clock signal to control driving circuit 1200, and sequence controller can be provided directly
Signal HVA is controlled to control gamma voltage generation circuit 1100, other circuits is also can control and generates control signal HVA to control
Gamma voltage generation circuit 1100.
Gamma voltage generation circuit 1100 can be identical as the gamma voltage generation circuit 10 of first embodiment shown in FIG. 1
(single channel), can also (multichannel) identical as the gamma voltage generation circuit 100 of second embodiment shown in Fig. 2, however this
The embodiment of invention is without being limited thereto, and scheme substantially identical with present inventive concept, principle is within the scope of the invention.
Under wide viewing angle display pattern, sequence controller 1300 (or other circuits) output control signal HVA to gamma electricity
Generation circuit 1100 is pressed, so that gamma voltage generation circuit 1100 generates the gamma electric voltage under wide viewing angle display pattern and is input to
Driving circuit 1200.Driving circuit 1200 adjusts gray scale voltage according to the gamma electric voltage under wide viewing angle display pattern, after adjusting
Gray scale voltage drives display panel 1400 to show image with wide viewing angle display pattern.At this point, the ash that driving circuit 1200 is exported
Rank voltage has center voltage Vcom_wva=(Vdh_w+Vdl_w)/2, and wherein Vdh_w and Vdl_w is respectively aobvious in wide viewing angle
Show positive polarity gray scale voltage corresponding with same grayscale and negative polarity gray scale voltage under mode.
Under narrow viewing angle display pattern, sequence controller 1300 (or other circuits) output control signal HVA to gamma electricity
Generation circuit 1100 is pressed, so that gamma voltage generation circuit 1100 generates the gamma electric voltage under narrow viewing angle display pattern and is input to
Driving circuit 1200.Driving circuit 1200 adjusts gray scale voltage according to the gamma electric voltage under narrow viewing angle display pattern, after adjusting
Gray scale voltage drives display panel 1400 to show image with narrow viewing angle display pattern.At this point, the ash that driving circuit 1200 is exported
Rank voltage has center voltage Vcom_nva=(Vdh_n+Vdl_n)/2, and wherein Vdh_n and Vdl_n is respectively aobvious in narrow viewing angle
Show positive polarity gray scale voltage corresponding with same grayscale and negative polarity gray scale voltage under mode.
Since driving circuit can only generate gray scale voltage based on changeless reference voltage, in order to avoid liquid crystal display dress
It sets and scintillation occurs in wide viewing angle display pattern and the switching of narrow viewing angle display pattern, enable gamma voltage generation circuit in difference
Different gamma electric voltages is exported under display pattern to adjust gray scale voltage, so that under the same grayscale: wide viewing angle display pattern
Gray scale voltage center voltage Vcom_wva be less than narrow viewing angle display pattern gray scale voltage center voltage Vcom_nva, from
And achieve the purpose that the scintillation occurred when eliminating switching display pattern.
In above-described embodiment, control signal is generated by the sequence controller of liquid crystal display device, however controls coming for signal
Source is without being limited thereto, i.e., control signal can be provided by the circuit of the other parts except sequence controller.
Fig. 4 shows the flow diagram of the driving method of fourth embodiment of the invention, including step S201 to S203.
In step s 201, it is provided for handing off the control signal of the plurality of display modes.The plurality of display modes
Including wide viewing angle display pattern and narrow viewing angle display pattern.
It is according to the control signal, one of first voltage and second voltage is defeated as gamma electric voltage in step S202
Out.
Under the wide viewing angle display pattern, the control signal is defeated as the gamma electric voltage using the first voltage
Out, under the narrow viewing angle display pattern, the control signal is exported the second voltage as the gamma electric voltage.
In step S203, under each grayscale, positive polarity ash corresponding with the grayscale is adjusted according to the gamma electric voltage
The average voltage of rank voltage and negative polarity gray scale voltage.
Under same grayscale, the average voltage (i.e. the center voltage of gray scale voltage) of the wide viewing angle display pattern
Less than the average voltage of the narrow viewing angle display pattern, so that display pattern switching front and back be avoided scintillation occur.
In conclusion gamma voltage generation circuit provided in an embodiment of the present invention, liquid crystal display device and driving method,
By the gamma electric voltage under setting different display modes, the adjusting to gray scale voltage is realized, so that under same grayscale: wide viewing angle
The center voltage of the gray scale voltage of display pattern is less than the center voltage of the gray scale voltage of narrow viewing angle display pattern, to avoid showing
Show before and after pattern switching scintillation occur, promotes the comfort level of user's perception.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (8)
1. a kind of gamma voltage generation circuit for plurality of display modes, the plurality of display modes includes that wide viewing angle shows mould
Formula and narrow viewing angle display pattern, which is characterized in that the gamma voltage generation circuit includes:
First voltage generation module obtains at least one first voltage, each first voltage for dividing to supply voltage
Less than the supply voltage；
Second voltage generation module, for dividing to obtain at least one second voltage to the supply voltage, each described second
Voltage is less than the supply voltage；
Level switch module, for being converted to switching signal for signal is controlled according to the supply voltage, so that the switching is believed
It is equal to the supply voltage number under high level logic, is equal under low-level logic and refers to ground voltage；
Switching module, for exporting gamma electric voltage according to the switching signal,
Wherein, the switching module includes at least one P-type transistor and at least one N-type transistor, each P-type crystal
The control terminal of the control terminal of pipe and each N-type transistor receives the switching signal,
Under the wide viewing angle display pattern, the switching signal is high level logic, at least one described N-type transistor is led
It passes to and exports at least one described first voltage as the gamma electric voltage,
Under the narrow viewing angle display pattern, the switching signal is low-level logic, at least one described P-type transistor is led
It passes to and exports at least one described second voltage as the gamma electric voltage,
Under each grayscale, the gamma electric voltage is for adjusting positive polarity gray scale voltage corresponding with the grayscale and negative polarity grayscale
The average voltage of voltage,
Under same grayscale, the average voltage of the wide viewing angle display pattern is less than the institute of the narrow viewing angle display pattern
State average voltage.
2. gamma voltage generation circuit according to claim 1, wherein the switching module includes that at least one switching is single
Member, each switch unit receive a first voltage and a second voltage and are selected according to the switching signal
Alternative one is selected to export as gamma electric voltage.
3. gamma voltage generation circuit according to claim 2, wherein each switch unit includes a N
Transistor npn npn and a P-type transistor,
In each switch unit, the N-type transistor is connected with the control terminal of the P-type transistor and receives described cut
Signal is changed, the input terminal of the N-type transistor receives a first voltage corresponding with the switch unit, and the p-type is brilliant
The input terminal of body pipe receives a second voltage corresponding with the switch unit, the N-type transistor and the P-type crystal
The output end of pipe is connected and exports the gamma electric voltage.
4. gamma voltage generation circuit according to claim 3, wherein at least one described N-type transistor and it is described extremely
Lack a P-type transistor for field-effect tube, the control terminal of each N-type transistor and each P-type transistor is grid,
The input terminal of each N-type transistor and each P-type transistor is source electrode, each N-type transistor and each institute
The output end of P-type transistor is stated as drain electrode.
5. gamma voltage generation circuit according to claim 1, wherein
The first voltage generation module includes n+1 first resistor being connected between the supply voltage and ground, every two
Node between the adjacent first resistor exports a first voltage,
The second voltage generation module includes n+1 second resistance being connected between the supply voltage and ground, every two
Node between the adjacent second resistance exports a second voltage, and n is non-zero natural number.
6. a kind of liquid crystal display device for plurality of display modes, comprising:
Such as gamma voltage generation circuit described in any one of claim 1 to 5, in the wide viewing angle display pattern and described
At least one corresponding gamma electric voltage is provided according to the control signal under narrow viewing angle display pattern；
Driving circuit, for adjusting gray scale voltage according at least one described gamma electric voltage；
Sequence controller controls the driving circuit for providing clock signal；
Display panel, for receiving the gray scale voltage to realize the display of image.
7. liquid crystal display device according to claim 6, wherein the sequence controller provides the control signal.
8. a kind of driving method of the liquid crystal display device for plurality of display modes, the plurality of display modes includes wide viewing angle
Display pattern and narrow viewing angle display pattern, which is characterized in that the driving method includes:
It is provided for handing off the control signal of the plurality of display modes；
The control signal is converted into switching signal according to supply voltage, so that the switching signal is inferior in high level logic
In the supply voltage, it is equal to low reference voltage under low-level logic；
The supply voltage is divided to obtain at least one first voltage, to the supply voltage divide to obtain at least one second
Voltage, so that each first voltage and each second voltage are respectively less than the supply voltage；And
Gamma electric voltage is exported according to the switching signal,
Wherein, include: according to the step of switching signal output gamma electric voltage
Under the wide viewing angle display pattern, the switching signal is high level logic, using at least one N-type transistor by institute
At least one first voltage is stated to export as the gamma electric voltage,
Under the narrow viewing angle display pattern, the switching signal is low-level logic, using at least one P-type transistor by institute
It states at least one second voltage to export as the gamma electric voltage, at least one described N-type transistor and at least one described p-type
The control terminal of transistor receives the switching signal,
Under each grayscale, positive polarity gray scale voltage corresponding with the grayscale and negative polarity grayscale are adjusted according to the gamma electric voltage
The average voltage of voltage,
Under same grayscale, the average voltage of the wide viewing angle display pattern is less than the institute of the narrow viewing angle display pattern
State average voltage.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107995718B (en) * | 2017-10-20 | 2019-11-19 | 昆山龙腾光电有限公司 | Polarity correction circuit |
| CN108847184B (en) * | 2018-07-09 | 2020-03-31 | 京东方科技集团股份有限公司 | Gamma voltage compensation circuit and compensation method, source driver and display panel |
| US11294209B2 (en) | 2018-08-03 | 2022-04-05 | Infovision Optoelectronics (Kunshan) Co., Ltd. | Liquid crystal display device |
| CN109658899B (en) * | 2019-02-28 | 2021-01-29 | 昆山龙腾光电股份有限公司 | Voltage switching circuit, gamma voltage generating circuit and liquid crystal display device |
| CN109976006B (en) * | 2019-04-09 | 2022-04-22 | 昆山龙腾光电股份有限公司 | Driving method of liquid crystal display device |
| WO2023102996A1 (en) * | 2021-12-07 | 2023-06-15 | 惠州华星光电显示有限公司 | Display driving method, and display |
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