CN110164393A - A kind of display driver circuit and display methods - Google Patents
A kind of display driver circuit and display methods Download PDFInfo
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- CN110164393A CN110164393A CN201910381448.5A CN201910381448A CN110164393A CN 110164393 A CN110164393 A CN 110164393A CN 201910381448 A CN201910381448 A CN 201910381448A CN 110164393 A CN110164393 A CN 110164393A
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- reference voltage
- switching tube
- gamma reference
- resistance
- pressure difference
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- 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
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
Abstract
It includes front input module that the present invention, which provides a kind of display driver circuit and display methods, display driver circuit, provides control signal；Time-sequence control module provides display code and clock signal；Detect control module, it is electrically connected with front input module and time-sequence control module, when detecting control signal, it is reduced according to clock signal per the pressure difference between gamma reference voltage and public electrode voltages all the way, gamma reference voltage pressure difference is reduced to reduce gamma electric voltage pressure difference, to be inserted into dark-state frame with this；Source drive module is electrically connected with detecting control module and time-sequence control module, according to the display code and gamma reference voltage received, exports source electrode driving signal to drive display picture frame or dark-state frame.Display driver circuit provided by the invention and display methods, to be inserted into dark-state frame, improve display effect to reduce gamma electric voltage pressure difference to close to public electrode voltages.
Description
Technical field
The present invention relates to field of display technology, more particularly to a kind of display driver circuit and display methods.
Background technique
Since liquid crystal display device has many advantages, such as frivolous, energy saving, radiationless, it is now widely used for TV, personal electricity
The electronics such as brain, tablet computer, PDA (Personal Digital Assistant, personal digital assistant), mobile phone, digital camera
In equipment, for example need to be inserted into the black picture of dark-state frame in the application of some 3D videos or multi-angle of view mode in many situations.
By taking the application of liquid crystal display device multi-angle of view mode as an example, when field-of-view mode switching, it is different that liquid crystal display image quality will appear display
Chang Wenti.Such as liquid crystal display device, when being switched to wide viewing angle from narrow viewing angle, the charge needs in display panel switch over, and use
Family can find charge residue or ghost under brighter picture (such as white picture), this will so that user's vision viewing effect compared with
Difference.
In view of the above-mentioned problems, existing solution is, front end system input signal and strong is truncated by sequence controller
System is inserted into the black picture of dark-state frame to solve.However the program the problem is that: need to sacrifice partial function just can be achieved, example
Such as: ACC (Accurate Color Calibration, accurate colour correction) function；In addition sequence controller is entering PSR
After (panelSelf Refresh, self refresh signal), it cannot achieve and be forcibly inserted into dark-state frame, can not solve the above problems.
And can be realized the only sequence controller chip of Novatek of insertion dark-state frame, by very big limit in the selection of scheme
System.In addition portioned product also drags down or force the black plug that the method drawn high can be covert using by common voltage pressure, but
It can be only inserted into the black picture of half, whole display is to insert chequered with black and white grey picture.
Summary of the invention
The purpose of the present invention is to provide a kind of display driver circuit and display methods, when needing to be inserted into dark-state frame, drop
The pressure difference of low gamma reference voltage, to be inserted into dark-state frame, is mentioned with reducing the pressure difference of gamma electric voltage to close to public electrode voltages
Rise user's vision viewing effect.
Specifically, the present invention provides a kind of display driver circuit, comprising:
Front input module provides control signal；
Time-sequence control module provides display code and clock signal；
Control module is detected, is electrically connected with the front input module and time-sequence control module, public electrode voltages is provided,
And when the control signal is not detected, normal gamma reference voltage is exported according to the clock signal, to show
Picture frame；When detecting the control signal, reduced according to the clock signal per the gamma reference voltage described all the way and public
Pressure difference between common-battery pole tension reduces gamma reference voltage pressure difference to reduce gamma electric voltage pressure difference, to be inserted into dark-state with this
Frame；
Source drive module is electrically connected, according to receiving with the detecting control module and time-sequence control module
It shows code and gamma reference voltage, exports source electrode driving signal to drive display described image frame or dark-state frame.
Further, the front input module exports the control signal, institute when field-of-view mode signal changes
It states time-sequence control module to be electrically connected with the front input module, the time-sequence control module is detecting the field-of-view mode letter
When number changing, the display code and clock signal of corresponding field-of-view mode are exported.
Further, the switching that the detecting control module includes circuit for detecting and is electrically connected with the circuit for detecting
Circuit, the circuit for detecting invert pressure difference control level when detecting that the field-of-view mode signal changes to the switch
Switching circuit, to reduce the gamma reference voltage pressure difference.
Preferably, the switch switching circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, first switch tube, second switch and third switching tube；Wherein, the first resistor series connection
It is set between the analog voltage of input and the first via gamma reference voltage of output, the second resistance is arranged in series in output
First via gamma reference voltage and the second switch input terminal between, the 3rd resistor is arranged in series in output
Between first via gamma reference voltage and ground, the 4th resistance series connection be set to input analog voltage and the first switch
Between the input terminal of pipe, the control terminal of the second switch is electrically connected with the input terminal of the first switch tube, and described second
Switching tube and the output end of first switch tube ground connection, the control terminal of the first switch tube receive the pressure difference control of input
Level processed；The 5th resistance series connection is set between the analog voltage of input and the second road gamma reference voltage of output, institute
The series connection of the 6th resistance is stated to be set between the second road gamma reference voltage of output and the input terminal of the third switching tube, it is described
The series connection of 7th resistance is set between the second road gamma reference voltage of output and ground, the output termination of the third switching tube
Ground, the pressure difference that the control terminal of the third switching tube receives input control level.
Preferably, the switch switching circuit includes the first zero resistance, the second zero resistance, third zero resistance, the 4th 0 electricity
Resistance, the 5th zero resistance, the 6th zero resistance, the one zero switching tube, the 2nd 0 switching tube, the 3rd 0 switching tube, the 4th 0 switching tube
With the 5th 0 switching tube；Wherein, the second end of second zero resistance, third zero resistance, the 4th zero resistance, the 5th zero resistance,
The first end of 6th zero resistance is sequentially connected in series divider resistance string, wherein in the divider resistance string the second zero resistance first
End receives the analog voltage of input, the second end ground connection of the 6th zero resistance, and first zero resistance is arranged in series in input
Analog voltage and the one zero switching tube input terminal between, the control terminal of the one zero switching tube, the 2nd 0 switch
The control terminal of pipe and the control terminal of the 3rd 0 switching tube receive the pressure difference control level of input, the one zero switch simultaneously
The output end of pipe is grounded, and the input terminal of the 2nd 0 switching tube is electrically connected between second zero resistance and third zero resistance
Common end, the input terminal of the 4th 0 switching tube is electrically connected to public between the third zero resistance and the 4th zero resistance
End, the control terminal of the 4th 0 switching tube are electrically connected to the control terminal of the 5th 0 switching tube and the public affairs of the one zero switching tube
End, the input terminal of the 5th 0 switching tube are electrically connected to the common end between the 4th zero resistance and the 5th zero resistance altogether,
The input terminal of 3rd 0 switching tube is electrically connected to the common end between the 5th zero resistance and the 6th zero resistance, and described
The output end of 20 switching tubes is electrically connected with the output end of the 4th 0 switching tube and exports first via gamma reference voltage, and described
The output end of 50 switching tubes is electrically connected with the output end of the 3rd 0 switching tube and exports the second road gamma reference voltage.
Further, at the appointed time the interior holding output of section reduces the Gamma reference electricity after pressure difference to the detecting control module
Pressure is with dark-state frame described in insert continually.
Further, the designated time period is 9 frame times.
Preferably, the detecting control module is when detecting that the field-of-view mode signal changes, by the institute of output
State the pressure difference between the highest gamma reference voltage of voltage value in gamma reference voltage and the minimum gamma reference voltage of voltage value
It is reduced to 1V or less.
The present invention also provides a kind of display methods, and specifically, the display methods includes:
When control signal is not detected, normal gamma reference voltage pressure difference is exported, to show picture frame；It is detecting
When to the control signal, reduces per the pressure difference between gamma reference voltage and public electrode voltages all the way, gamma is reduced with this
Reference voltage pressure difference is to reduce the pressure difference of gamma electric voltage, to be inserted into dark-state frame.
Further, after insertion dark-state frame the step of further include: at the appointed time after section, by the Gamma reference
Voltage restores normal pressure difference, to restore normal display.
Display driver circuit provided by the invention and display methods reduce Gamma reference electricity when needing to be inserted into dark-state frame
Pressure difference is pressed, to reduce gamma electric voltage pressure difference to being inserted into dark-state frame, improving the viewing of user's vision close to public electrode voltages
Effect enhances product competitiveness.
Detailed description of the invention
Fig. 1 is the functional block diagram of one embodiment of the invention display driver circuit.
Fig. 2 is the working timing figure of one embodiment of the invention display driver circuit wide and narrow viewing angle modes handoff procedure.
Fig. 3 is the electrical block diagram of one embodiment of the invention switch switching circuit.
Fig. 4 is the electrical block diagram of another embodiment of the present invention switch switching circuit.
Fig. 5 is that the source drive signal in one embodiment of the invention display driver circuit wide and narrow viewing angle modes handoff procedure shows
Wave device waveform diagram.
Fig. 6 is one embodiment of the invention display methods work step schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
In the display driving of liquid crystal display panel, the voltage, that is, gray scale voltage and public electrode of different source drive signal S
Pressure difference between voltage Vcom causes the rotation angle difference of liquid crystal molecule to form the difference of display brightness, that is, is formed different
Grayscale.Wherein, the relationship between gray scale voltage and display grayscale is called gamma curve.It, can such as in 8bit liquid crystal display panel
To show 256 grayscale, corresponding 256 different gray scale voltages.In available liquid crystal product, usually selected in gamma curve
Key point out realizes the adjusting of gamma curve by adjusting the corresponding gamma electric voltage of key point.In order to avoid liquid crystal molecule
Polarization problem, same display pixel, which generallys use the alternate mode of positive-negative polarity and carries out grayscale, to be shown.Such as in 14 selected
In gamma electric voltage, for public electrode voltages Vcom, 7 gamma electric voltages are positive polar, and in addition 7 gamma electric voltages are
Negative polarity, wherein the gamma curve of the gamma electric voltage of the gamma electric voltage and negative polarity of positive polarity forms symmetric relation.Then again
256 gray scale voltages are produced by this 14 gamma electric voltage adjustings, and then realize the display of 256 grayscale.
Since the power supply analog voltage AVDD of funtion part each in panel is mostly by the boosting in DC-DC circuit
Circuit conversion, under the working condition of loading condition complexity, analog voltage AVDD has part pressure drop and ripple.For essence
Standard adjusts out the gamma electric voltage of key point in gamma curve, it usually needs by analog voltage AVDD by low pressure difference linearity pressure stabilizing
Gamma reference voltage V1~Vn is obtained after the processing of gamma reference voltage circuit, then is modulated precisely by gamma reference voltage V1~Vn
Stable gamma electric voltage.Wherein n is the positive integer greater than 1.Some in use, seeming to have only used Gamma reference electricity all the way
Pressing V1, actually another way gamma reference voltage V2 is ground, and principle is steady between reference voltage V1 and ground all the way by this
Level pressure difference modulates required gamma electric voltage.At this point, in the case where not influencing sequence controller, with public electrode voltages Vcom
It will be every by reducing per the pressure difference between gamma reference voltage V1~Vn and public electrode voltages Vcom all the way for center voltage
Gamma reference voltage V1~Vn changes to close to public electrode voltages Vcom all the way, at this time any two-way gamma reference voltage V1~
Pressure difference between Vn is all lowered, so that it may which forcibly changing gamma electric voltage is further forced to close to public electrode voltages Vcom
Change the gray scale voltage of source drive signal S to close to public electrode voltages Vcom, thus reduce the deflection angle of liquid crystal molecule,
Realize insertion dark-state frame.
Specifically, as shown in Figure 1, in an embodiment of the present invention, display driver circuit include front input module 11, when
Sequence control module 12, detecting control module 13 and source drive module 14.
Wherein, front input module 11 is for providing control signal.In one embodiment, front input module 11 is at visual angle
When mode changes, field-of-view mode signal HVA changes as control signal, so that front input module 11 is in visual angle mould
Output control signal when formula signal HVA changes.In another embodiment, the control signal that front input module 11 provides can
To come from program setting or clock signal.In other embodiments, the control signal that front input module 11 provides can be with
Come from other hardware or software signal.
Specifically, when user needs to change field-of-view mode, for example, leniently field-of-view mode be changed to narrow viewing angle mode or from
When narrow viewing angle mode is changed to wide viewing angle mode, the field-of-view mode signal HVA that front input module 11 provides is switched over.One
In embodiment, the change of field-of-view mode signal HVA is the switching of enable signal such as low and high level, at this time the failing edge of enable signal
Or rising edge is exactly to control signal.In another embodiment, the change of field-of-view mode signal HVA is with command code signal form
It is changed, so as to select a variety of field-of-view modes.As long as field-of-view mode signal HVA changes, it is defeated to be treated as front end
Enter module 11 and has issued control signal.
In one embodiment, the corresponding field-of-view mode button switch of environmental selection of the user according to locating for itself, to make
Front input module 11 generates corresponding field-of-view mode signal HVA and changes.In another embodiment, front input module
11 can also issue different perspectives mode signal HVA automatically according to environment sensing result by system to carry out cutting for visual pattern
It changes.As long as field-of-view mode signal HVA changes, it is treated as front input module 11 and has issued control signal.
Time-sequence control module 12 is electrically connected with front input module 11, for the field-of-view mode signal HVA by receiving
Selection exports corresponding display code C and clock signal T.
Detecting control module 13 is electrically connected with front input module 11 and time-sequence control module 12, for providing public electrode
Voltage Vcom, and corresponding gamma reference voltage V1~Vn and public is provided according to field-of-view mode signal HVA and clock signal T
Electrode voltage Vcom.
Source drive module 14 is electrically connected with detecting control module 13 and time-sequence control module 12, is received for basis
Show code C and gamma reference voltage V1~Vn, export source electrode driving signal S with drive display panel carry out display dark-state frame or
Person's picture frame.
Specifically, detecting control module 13 is when being not detected field-of-view mode signal HVA and changing, according to clock signal
T exports normal gamma reference voltage V1~Vn and public electrode voltages Vcom, so that display panel shows picture frame.It detects
Control module 13 is surveyed when detecting that field-of-view mode signal HVA changes, no matter whether public electrode voltages Vcom becomes
Change, public electrode voltages Vcom is followed to reduce per the pressure between gamma reference voltage V1~Vn and public electrode voltages Vcom all the way
Difference so that source drive module 14 change output source drive signal S voltage to close to public electrode voltages Vcom from
And it is inserted into dark-state frame.
Specifically, when gamma reference voltage V1~Vn be greater than two-way when, that is, n be greater than 2 when, reduce gamma reference voltage V1~
Pressure difference between Vn can be the synchronous of the pressure difference between gamma reference voltage V1~Vn and reduce.Such as reduce the gamma after pressure difference
Reference voltage V1~Vn all exports public electrode voltages Vcom, at this time the pressure difference between every two-way gamma reference voltage V1~Vn
It is zero.Again for example in four road gamma reference voltage V1~V4s of the n equal to 4, public electrode voltages Vcom is 5V, normal gamma
Reference voltage V1~V4 voltage is respectively as follows: 8.5V, 7.5V, 2.5V and 1.5V, gamma reference voltage V1~V4 after reducing pressure difference
Voltage is respectively as follows: 4.5V, 4.3V, 3.7V and 3.5V, and public electrode voltages Vcom is 4V at this time.It can certainly be according to specific dark
The gamma curve of state frame reduces the pressure difference between gamma reference voltage V1~Vn, such as the gamma curve that gamma value is 1.Lead in a word
Change is crossed per gamma reference voltage V1~Vn all the way to close to public electrode voltages Vcom, so that it may which forcibly changing gamma electric voltage is extremely
Close to public electrode voltages Vcom, the gray scale voltage of further forcibly changing source drive signal S is to close to public electrode voltages
Vcom realizes insertion dark-state frame to reduce the deflection angle of liquid crystal molecule.
In one embodiment, detecting control module 13 includes circuit for detecting 131 and switch switching circuit 132.Circuit for detecting
131 are electrically connected with switch switching circuit 132, and whether circuit for detecting 131 changes according to detection field-of-view mode signal HVA, mention
For corresponding pressure difference control level Vs to switch switching circuit 132, switch switching circuit 132 controls level Vs according to pressure difference and switches
Output reduces gamma reference voltage V1~Vn after pressure difference.
In one embodiment, the pressure difference in two groups of gamma reference voltage V1~Vn that switch switching circuit 132 exports is different,
Wherein, the pressure difference between the highest gamma reference voltage Va of voltage value and the minimum gamma reference voltage Vb of voltage value is (hereinafter referred to as
Maximum differential pressure Va-Vb) it is also different.In one embodiment, for example, in normal gamma reference voltage V1~Vn, voltage value highest
Gamma reference voltage Va be 8.5V, the minimum gamma reference voltage Vb of voltage value is 1.4V.First group of gamma reference voltage
V1~Vn maximum differential pressure Va-Vb is 7.1v, is normal gamma reference voltage V1~Vn pressure difference, second group of gamma reference voltage
V1~Vn maximum differential pressure Va-Vb is 1v, is gamma reference voltage V1~Vn pressure difference of dark-state frame.In another embodiment, second
Gamma reference voltage V1~Vn maximum differential pressure Va-Vb of group is less than 1V to export dark-state frame.In other embodiments, first group
Gamma reference voltage V1~Vn maximum differential pressure Va-Vb and second group gamma reference voltage V1~Vn maximum differential pressure Va-Vb
It can be set as other different values according to specific system architecture and required gamma curve.
Specifically, as shown in Fig. 2 working timing figure, when working properly, detecting control module 13 passes through switching electricity
Gamma reference voltage V1~Vn of selected first group of the output in road 132, to export maximum differential pressure Va-Vb as the Gamma reference electricity of 7.1V
Press V1~Vn.When detecting control module 13 in circuit for detecting 131 when detecting that field-of-view mode signal HVA changes, root
Level Vs is controlled according to clock signal T reversion pressure difference, so that the switching of switch switching circuit 132 exports second group of gamma reference voltage
V1~Vn, to export corresponding maximum differential pressure Va-Vb for gamma reference voltage V1~Vn of 1v, to reduce the pressure of gamma electric voltage
Difference is to drive display panel to show dark-state frame.
In one embodiment, circuit for detecting 131 inverts pressure difference by MCU and controls level Vs.In another embodiment, it detects
Circuit 131 inverts pressure difference by sequence controller and controls level Vs.In other embodiments, circuit for detecting 131 can also pass through
The reversion of other hardware such as logic circuit or software realization pressure difference control level Vs.
In one embodiment, it is by pressure difference control level Vs by high level that circuit for detecting 131, which inverts pressure difference control level Vs,
Become low level.In another embodiment, it is by pressure difference control level Vs by low that circuit for detecting 131, which inverts pressure difference control level Vs,
Level becomes high level.
In one embodiment, n=2.For example, detecting control module 13 provides Gamma reference electricity in 8bit panel data
Press V1 and gamma reference voltage V2 to source drive module 14, so that the programmable gamma chip inside source drive module 14
14 road gamma electric voltages are generated, and further generate 256 gray scale voltages, corresponding 256 grayscale of this 256 gray scale voltages are shown.
As shown in the electrical block diagram of mono- embodiment switch switching circuit 132 of Fig. 3, including first resistor R11, second
Resistance R12,3rd resistor R13, the 4th resistance R14, the 5th resistance R21, the 6th resistance R22, the 7th resistance R23, first switch
Pipe Q30, second switch Q31 and third switching tube Q32.Wherein, first resistor R11 is arranged in series the analog voltage in input
Between AVDD and the first via gamma reference voltage V1 of output, second resistance R12 is arranged in series the first via gamma ginseng in output
It examines between voltage V1 and the input terminal of second switch Q31,3rd resistor R13 is arranged in series the first via Gamma reference in output
Between voltage V1 and ground, the 4th resistance R14 is arranged in series in the input terminal of the analog voltage AVDD and first switch tube Q30 of input
Between, the control terminal of second switch Q31 is electrically connected with the input terminal of first switch tube Q30, and second switch Q31 and first is opened
The output end ground connection of pipe Q30 is closed, the pressure difference that the control terminal of first switch tube Q30 receives input controls level Vs；5th resistance R21
It is arranged in series between the analog voltage AVDD of input and the second road gamma reference voltage V2 of output, the 6th resistance R22 series connection
It is set between the second road gamma reference voltage V2 of output and the input terminal of third switching tube Q32, the 7th resistance R23 series connection is set
It is placed between the second road gamma reference voltage V2 of output and ground, the output end ground connection of third switching tube Q32, third switching tube
The pressure difference that the control terminal of Q32 receives input controls level Vs, and wherein the switching tube in circuit is N type switch tube, in certain circuit
Switching tube may be other kinds of switch element such as triode etc..
In this embodiment, when system electrification initializes, the pressure difference of the high level of the output default of circuit for detecting 131 controls electricity
Flat Vs, first switch tube Q30 is opened at this time, and third switching tube Q32 is opened, and the control terminal of second switch Q31 is low electricity at this time
It is flat, therefore second switch Q31 is turned off, second resistance R12, which is equivalent to, at this time is suspended；Third switching tube Q32 opens phase at this time
It is grounded when in by the 6th one end resistance R22, therefore gamma reference voltage V1 and gamma reference voltage V2 exports first group of gamma
Reference voltage V1~V2 such as 8.5V and 1.4V, so that source drive module 14 be made to drive normal display picture frame.Work as circuit for detecting
131 when detecting that field-of-view mode signal HVA changes, and exports low level pressure difference control level Vs, at this time first switch tube
Q30 shutdown, third switching tube Q32 shutdown, the control terminal of second switch Q31 is high level, therefore second switch Q31 at this time
It opens, one end of second resistance R12 is equivalent to ground connection at this time, and third switching tube Q32 shutdown at this time is equivalent to the 6th resistance R22's
One end is suspended, therefore gamma reference voltage V1 and gamma reference voltage V2 exports second group of gamma reference voltage V1~V2's
Voltage such as 5.5V and 4.5V, to make the driving display dark-state frame of source drive module 14.In other embodiments, specific voltage
Also required other values be can be set as.
In the electrical block diagram of another embodiment switch switching circuit 132, as shown in figure 4, including the one zero electricity
Hinder R40, the second zero resistance R41, third zero resistance R42, the 4th zero resistance R43, the 5th zero resistance R44, the 6th zero resistance R45,
One zero switching tube Q40, the 2nd 0 switching tube Q41, the 3rd 0 switching tube Q42, the 4th 0 switching tube Q43 and the 5th 0 switching tube
Q44.Wherein, the second end of the second zero resistance R41, third zero resistance R42, the 4th zero resistance R43, the 5th zero resistance R44, the 6th
The first end of zero resistance R45 is sequentially connected in series divider resistance string, wherein in divider resistance string the second zero resistance R41 first end
The second end ground connection of the analog voltage AVDD, the 6th zero resistance R45 of input are received, the first zero resistance R40 is arranged in series in input
Analog voltage AVDD and the one zero switching tube Q40 input terminal between, the control terminal of the one zero switching tube Q40, the 2nd 0 are opened
The control terminal of the control terminal and the 3rd 0 switching tube Q42 of closing pipe Q41 receives the pressure difference control level Vs of input simultaneously, and the one zero opens
The output end ground connection of pipe Q40 is closed, the input terminal of the 2nd 0 switching tube Q41 is electrically connected to the second zero resistance R41 and third zero resistance
Common end between R42, the input terminal of the 4th 0 switching tube Q43 be electrically connected to third zero resistance R42 and the 4th zero resistance R43 it
Between common end, the control terminal of the 4th 0 switching tube Q43 be electrically connected to the 5th 0 switching tube Q44 control terminal and the 1st switch
The input terminal of the input terminal of pipe Q40, the 5th 0 switching tube Q44 is electrically connected between the 4th zero resistance R43 and the 5th zero resistance R44
Common end, the input terminal of the 3rd 0 switching tube Q42 is electrically connected to the public affairs between the 5th zero resistance R44 and the 6th zero resistance R45
End, the output end of the 2nd 0 switching tube Q41 are electrically connected with the output end of the 4th 0 switching tube Q43 and export the gamma of the first via altogether
Reference voltage V1, the output end of the 5th 0 switching tube Q44 are electrically connected with the output end of the 3rd 0 switching tube Q42 and export the second tunnel
Gamma reference voltage V2, wherein the switching tube in circuit is N type switch tube, and the switching tube in certain circuit may be other classes
The switch element of type such as triode etc..
In this embodiment, when system electrification initializes, the pressure difference of the high level of the output default of circuit for detecting 131 controls electricity
Flat Vs, the one zero switching tube Q40, the 2nd 0 switching tube Q41 and the 3rd 0 switching tube Q42 are opened at this time, at this time the 4th 0 switch
The control terminal of pipe Q43 and the 5th 0 switching tube Q44, which are equivalent to, is connect low level, therefore the 4th 0 switching tube Q43 is turned off, and the 5th 0
Switching tube Q44 shutdown, by the partial pressure of divider resistance string, gamma reference voltage V1 and gamma reference voltage V2 export first group
Gamma reference voltage V1~V2 such as 8.5V and 1.4V, so that source drive module 14 be made to drive normal display picture frame.Work as detecting
When circuit 131 detects that field-of-view mode signal HVA changes, low level pressure difference control level Vs is exported, at this time the 1st
Switching tube Q40 shutdown, the 2nd 0 switching tube Q41 shutdown, the 3rd 0 switching tube Q42 shutdown, at this time the 4th 0 switching tube Q43 and the
The control terminal of 50 switching tube Q44 is high level, therefore the 4th 0 switching tube Q43 and the 5th 0 switching tube Q44 is opened, through excessive
The partial pressure of piezoresistance string, gamma reference voltage V1 and gamma reference voltage V2 export second group of gamma reference voltage V1~V2's
Voltage such as 5.5V and 4.5V, to make the driving display dark-state frame of source drive module 14.In other embodiments, specific voltage
Also required other values be can be set as.
In another embodiment, switch switching circuit 132 is from each fixed voltage end switching output gamma set
Reference voltage V1~Vn's.In other examples, the reduction of gamma reference voltage V1~Vn pressure difference is also possible in industry
The other methods such as common software or hardware realize switching.
In one embodiment, detecting control module 13 is according to the gal after keeping reduction in clock signal T at the appointed time section
Horse reference voltage V1~Vn pressure difference is with insert continually dark-state frame.Control module 13 is detected at the appointed time after section, by gamma
Reference voltage V1~Vn restores normal pressure difference, to restore normal display.In one embodiment, it is verified by Detailed Experimental, works as finger
When section of fixing time is 9 frame, i.e., when detecting that field-of-view mode signal HVA changes, according to 9 frame of clock signal T insert continually
Dark-state frame, it is ensured that occur in view angle switch without picture abnormal problem.In other embodiments, due to chip each in driving circuit
The difference of change or performance can be calculated according to specific system architecture and corresponding designated time period is arranged.
As shown in figure 5, source electrode of one embodiment of the invention display driver circuit in wide and narrow viewing angle modes handoff procedure drives
In dynamic signal S waveform figure, wherein it is narrow viewing angle mode that a field-of-view mode change, which is by wide viewing angle pattern switching, detecing
It surveys control module 13 to detect after field-of-view mode signal HVA changes, exports second group of gamma according to clock signal T immediately
Reference voltage V1~Vn is to reduce the pressure difference of gamma reference voltage V1~Vn of output, to make the level of source drive signal S
It is synchronous to reduce by 9 frame dark-state frames of output, the gamma reference voltage that control module 13 exports first group according to clock signal T is detected later
V1~Vn with restore output gamma reference voltage V1~Vn normal pressure difference, hence into narrow viewing angle mode.Another secondary visual angle
It is wide viewing angle mode that mode change, which is by narrow viewing angle pattern switching, detects field-of-view mode signal HVA in detecting control module 13
After changing, second group of gamma reference voltage V1~Vn is exported to reduce gamma reference voltage according to clock signal T immediately
The pressure difference of V1~Vn detects control module so that the level synchronization of source drive signal S be made to reduce by 9 frame dark-state frames of output later
13 export first group of gamma reference voltage V1~Vn according to clock signal T to restore gamma reference voltage V1~Vn's of output
Normal pressure difference, hence into wide viewing angle mode.
In a display methods embodiment, be not detected control signal when, export normal gamma reference voltage V1~
Vn pressure difference, to show picture frame.Detect control signal for example field-of-view mode signal HVA changes when, reduce gamma ginseng
Voltage V1~Vn pressure difference is examined to reduce gamma electric voltage, the voltage pressure of source drive signal S is dragged down, liquid crystal molecule is caused to rotate
No matter angle very little shows whether code C switches completion at this time, is visually shown inserted into dark-state frame.According to insertion dark-state
The needs of frame can be inserted into dark-state frame in specified frame according to specific timing, section can also be inserted into dark-state at the appointed time
Frame.In one embodiment, after dark-state frame continues one section of specified time according to clock signal T, each function part of display system at this time
Divide all to have switched and finish, gamma reference voltage V1~Vn is restored into normal pressure difference, to restore normal display.
In conjunction with above embodiments and Fig. 1 and Fig. 2, display methods embodiment provided by the invention, general steps such as Fig. 6
It is shown:
First step S1: starting, and system electrification is initialized, 12 output timing signal T of time-sequence control module, into second
Walk S2；
The pressure difference that second step S2:MCU exports high level controls level Vs, into third step S3；
Third step S3: switch switching circuit 132 selects first group of gamma reference voltage V1~Vn, so that output is normal
Gamma reference voltage V1~Vn pressure difference, into the 4th step S4；
4th step S4: 14 driving panel of source drive module normally shows picture frame, into the 5th step S5；
Does 5th step S5: circuit for detecting 131 detect field-of-view mode signal HVA and changes? if it is, into the 6th
S6 is walked, if it is not, then into second step S2；
6th step S6:MCU controls level Vs, simultaneity factor according to the low level pressure difference that clock signal T exports 9 frame times
The field-of-view mode for switching selection, into the 7th step S7；
7th step S7: switch switching circuit 132 selects second group of gamma reference voltage V1~Vn, to reduce Gamma reference
Voltage V1~Vn pressure difference, into the 8th step S8；
8th step S8: source drive module 14 exports 9 frame dark-state frame pictures, returns to second step S2.
Display driver circuit provided by the invention and display methods, with reduce gamma electric voltage pressure difference to close to public electrode electricity
Pressure shows picture more high-quality, improves user's vision viewing effect, enhance product competitiveness to be inserted into dark-state frame.
In the accompanying drawings, for clarity, the size and relative size of layer and region can be exaggerated.It should be understood that working as
When element such as layer, region or substrate are referred to as on " being formed in ", " setting exists " or " being located at " another element, which can be straight
It connects and is arranged on another element, or there may also be intermediary elements.On the contrary, when element be referred to as " being formed directly into " or
When on " being set up directly on " another element, intermediary element is not present.
Herein unless specifically defined or limited otherwise, term " installation ", " connected ", " connection " should do broad sense reason
Solution, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connection, it can also be with
It is electrical connection；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary.
For the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood with concrete condition.
Herein, sequence adjective " first ", " second " for describing element etc. is used for the purpose of discriminative attributes class
As element, be not meant to that the element described in this way must be according to given sequence or time, space, grade or other
Limitation.
Herein, unless otherwise indicated, " multiple ", " several " are meant that two or more.
It will appreciated by the skilled person that realizing that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed.Storage medium above-mentioned includes: ROM, RAM, magnetic or disk
Etc. the various media that can store program code.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Herein, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, are removed
It comprising those of listed element, but also may include other elements that are not explicitly listed.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto.It is any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of display driver circuit characterized by comprising
Front input module provides control signal；
Time-sequence control module provides display code and clock signal；
Control module is detected, is electrically connected with the front input module and time-sequence control module, public electrode voltages is provided, and
When the control signal is not detected, normal gamma reference voltage is exported according to the clock signal, to show image
Frame；When detecting the control signal, reduced according to the clock signal per the gamma reference voltage described all the way and common electrical
Pressure difference between pole tension reduces gamma reference voltage pressure difference to reduce gamma electric voltage pressure difference, to be inserted into dark-state frame with this；
Source drive module is electrically connected with the detecting control module and time-sequence control module, according to the display received
Code and gamma reference voltage export source electrode driving signal to drive display described image frame or dark-state frame.
2. display driver circuit as described in claim 1, which is characterized in that the front input module is in field-of-view mode signal
The control signal is exported when changing, the time-sequence control module is electrically connected with the front input module, the timing
Control module exports the display code and timing letter of corresponding field-of-view mode when detecting that the field-of-view mode signal changes
Number.
3. display driver circuit as claimed in claim 2, which is characterized in that the detecting control module include circuit for detecting and
The switch switching circuit being electrically connected with the circuit for detecting, the circuit for detecting are detecting that the field-of-view mode signal changes
Pressure difference control level is inverted when change to the switch switching circuit, to reduce the gamma reference voltage pressure difference.
4. display driver circuit as claimed in claim 3, which is characterized in that the switch switching circuit include first resistor,
Second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first switch tube, second switch and
Third switching tube；Wherein, the first resistor is arranged in series the analog voltage in input and the first via Gamma reference electricity of output
Between pressure, the second resistance is arranged in series the input terminal of first via gamma reference voltage and the second switch in output
Between, the 3rd resistor is arranged in series between the first via gamma reference voltage and ground of output, the 4th resistance series connection
Be set between the analog voltage of input and the input terminal of the first switch tube, the control terminal of the second switch with it is described
The input terminal of first switch tube is electrically connected, the output end ground connection of the second switch and the first switch tube, and described first
The pressure difference that the control terminal of switching tube receives input controls level；The 5th resistance series connection is set to the analog voltage of input
Between the second road gamma reference voltage of output, the 6th resistance series connection is set to the second road gamma reference voltage of output
Between the input terminal of the third switching tube, the 7th resistance series connection be set to output the second road gamma reference voltage and
Between ground, the output end of the third switching tube is grounded, and the control terminal of the third switching tube receives the pressure difference control of input
Level processed.
5. display driver circuit as claimed in claim 3, which is characterized in that the switch switching circuit includes the one zero electricity
Resistance, the second zero resistance, third zero resistance, the 4th zero resistance, the 5th zero resistance, the 6th zero resistance, the one zero switching tube, the 2nd 0
Switching tube, the 3rd 0 switching tube, the 4th 0 switching tube and the 5th 0 switching tube；Wherein, the second end of second zero resistance,
Three zero resistances, the 4th zero resistance, the 5th zero resistance, the first end of the 6th zero resistance are sequentially connected in series divider resistance string, wherein
The first end of the second zero resistance receives the analog voltage of input, the second termination of the 6th zero resistance in the divider resistance string
Ground, first zero resistance is arranged in series between the analog voltage of input and the input terminal of the one zero switching tube, described
The control terminal of the control terminal of one zero switching tube, the control terminal of the 2nd 0 switching tube and the 3rd 0 switching tube receives input simultaneously
The pressure difference controls level, the output end ground connection of the one zero switching tube, the input terminal electrical connection of the 2nd 0 switching tube
Common end between second zero resistance and third zero resistance, the input terminal of the 4th 0 switching tube are electrically connected to described
The control terminal of common end between third zero resistance and the 4th zero resistance, the 4th 0 switching tube is electrically connected to the described 5th 0
The input terminal of the common end of the control terminal of switching tube and the one zero switching tube, the 5th 0 switching tube is electrically connected to the described 4th
The input terminal of common end between zero resistance and the 5th zero resistance, the 3rd 0 switching tube is electrically connected to the 5th zero resistance
And the 6th common end between zero resistance, the output end of the 2nd 0 switching tube are electrically connected with the output end of the 4th 0 switching tube
And first via gamma reference voltage is exported, the output end of the 5th 0 switching tube and the output end electricity of the 3rd 0 switching tube
It connects and exports the second road gamma reference voltage.
6. display driver circuit as described in claim 1, which is characterized in that the detecting control module is at the appointed time in section
Gamma reference voltage after keeping output to reduce pressure difference is with dark-state frame described in insert continually.
7. display driver circuit as claimed in claim 6, which is characterized in that the designated time period is 9 frame times.
8. display driver circuit as claimed in claim 2, which is characterized in that the detecting control module is detecting the view
When angle mode signal changes, by the highest gamma reference voltage of voltage value and voltage in the gamma reference voltage of output
The pressure difference being worth between minimum gamma reference voltage is reduced to 1V or less.
9. a kind of display methods, which is characterized in that the display methods includes:
When control signal is not detected, normal gamma reference voltage pressure difference is exported, to show picture frame；Detecting
When stating control signal, reduces per the pressure difference between gamma reference voltage and public electrode voltages all the way, Gamma reference is reduced with this
Voltage difference is to reduce the pressure difference of gamma electric voltage, to be inserted into dark-state frame.
10. display methods as claimed in claim 9, which is characterized in that the step of after insertion dark-state frame further include: specified
After period, the gamma reference voltage is restored into normal pressure difference, to restore normal display.
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