CN104700800B - Gamma voltage generation circuit and gamma voltage generation method - Google Patents
Gamma voltage generation circuit and gamma voltage generation method Download PDFInfo
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- CN104700800B CN104700800B CN201510127519.0A CN201510127519A CN104700800B CN 104700800 B CN104700800 B CN 104700800B CN 201510127519 A CN201510127519 A CN 201510127519A CN 104700800 B CN104700800 B CN 104700800B
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- 238000000034 method Methods 0.000 title claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present disclosure provides a gamma voltage generating circuit and method, which are suitable for a display panel capable of displaying a blank period and a display period of at least one picture. The gamma voltage generating circuit includes a plurality of transistors, a plurality of resistors, and a switching unit. A portion of the transistors is configured to be coupled in series with the electrical group. The switching unit turns off one part of the transistor and turns on the other part of the transistor during a blank period according to the received control signal. The other part of the transistor is used for receiving a preset gray scale voltage, and when the other part of the transistor is conducted, the preset gray scale voltage is transmitted to the serial connection points of the electric group through the other part of the transistor so as to output the preset gray scale voltage through the serial connection points.
Description
Technical field
The present invention relates to a kind of gamma voltage producing circuit, more particularly to a kind of can produce in the interregnum of display picture
The gamma voltage producing circuit and method of specific gamma voltage value.
Background technology
Now, intelligent apparatus are more and more inseparable with our life, for example the use of smart mobile phone, panel computer
Also increasingly popularize.In order to obtain more preferably appreciation effect, the manufacturer of each display floater is devoted to lifting display floater
Visible angle, therefore wide viewing angle display floater just arises.
In wide viewing angle display floater, which there are the problem that common voltage (Vcom) drifts about, and this is due to for controlling
Have caused by charge accumulation on the electrode of the liquid crystal layer deflection in display floater, and the drift of common voltage can cause display surface
Plate is produced in display picture cannot expected film flicker (flicker) phenomenon.In general, in order to solve above-mentioned asking
The electric charge accumulated in two lateral electrode of liquid crystal layer is discharged when typically being shut down using display, to improve common voltage by topic
Drifting problem and avoid display from having the situation of film flicker, but the effect of the discharged electric charge of this settling mode is limited.
The content of the invention
The present invention provides a kind of gamma voltage producing circuit, and which can improve asking for common voltage drift when display starting
Inscribe and avoid display from having the situation of film flicker.
The present invention separately provides a kind of gamma voltage production method suitable for above-mentioned gamma voltage producing circuit.
A kind of gamma voltage producing circuit proposed by the present invention, which is applied to a kind of display floater, and this kind of display floater is used
With during showing that at least one picture, the picture include one section of interregnum and one section of display.The gamma voltage is produced
Circuit includes that a first transistor, transistor seconds, multiple third transistor, multiple resistance and a switch are single
Unit.The first transistor have control end, a first end and second end, the first of the first transistor
End is electrically connected at a running voltage.The transistor seconds has a control end, a first end and one second
End, the second end of the transistor seconds is electrically connected at a reference voltage.The resistance is serially connected with the first transistor
The second end and the first end of the transistor seconds between, between the resistance that each resistance is adjacent by one go here and there
Contact and concatenate mutually.Each third transistor has control end, a first end and second end, and described the
The first end of three transistors is electrically connected at a preset gray scale voltage, and the magnitude of voltage of the preset gray scale voltage is between the work
Make between voltage and the reference voltage, and the second end of the third transistor is each electrically connected at the corresponding string
Contact.The switch element be electrically connected at the control end of the first transistor, the control end of the transistor seconds and
The control end of the third transistor.The switch element is to receive a control signal, and the control received by foundation
Signal and end the first transistor and the transistor seconds in the interregnum, and according to the control letter for being received
Number and turn on the third transistor in the interregnum.The switch element is according to the control signal for being received in described
The first transistor and the transistor seconds are turned on during display, and according to the control signal for being received in described aobvious
The cut-off third transistor during showing.When the third transistor is switched on, the preset gray scale voltage can be passed to
The concatenation point is with the output preset gray scale voltage by the concatenation point.
The another a kind of gamma voltage production method for proposing of the invention, its gamma electricity suitable for a display floater
Pressure produces circuit.To show at least one picture, the picture includes an interregnum and one to the display floater
During display.The gamma voltage producing circuit includes a first transistor, transistor seconds, multiple 3rd crystal
Pipe, multiple resistance and a switch element.The first transistor receives a running voltage, and the transistor seconds is received
One reference voltage, the resistance are serially connected between the first transistor and the transistor seconds and have multiple concatenations
Point, the third transistor receive a preset gray scale voltage, and the switch element is electrically connected at the first transistor, institute
State transistor seconds and the third transistor and decide whether to turn on the third transistor to lead to the gray scale voltage
Cross the third transistor to export to the concatenation point.The gamma voltage production method comprises the following steps：Control letter is provided
Number to the switch element.Wherein, the switch element ends described in the interregnum according to the control signal
One transistor and the transistor seconds, the switch element turn on institute according to the control signal in the interregnum
State third transistor.Wherein, during the display to turn on described first according to the control signal brilliant for the switch element
Body pipe and the transistor seconds, the switch element end described during the display according to the control signal
Three transistors.
The present invention is because be in the interregnum of display floater display picture, switch element is ended according to control signal
The first transistor and transistor seconds, and switch element is made in same interregnum according to control signal conducting multiple the
Three transistors, so that the preset gray scale voltage for being received is exported by third transistor by the concatenation point between multiple resistance,
Therefore still can improve the common voltage of drift in a period of running in display floater and realize avoiding display picture from flashing
Purpose.
Description of the drawings
Circuit diagrams of the Fig. 1 for the gamma voltage producing circuit of one embodiment of the invention；
Sequential charts of the Fig. 2 for the gamma voltage producing circuit of one embodiment of the invention；
Sequential charts of the Fig. 3 for the gamma voltage producing circuit of further embodiment of this invention；
Sequential charts of the Fig. 4 for the gamma voltage producing circuit of yet another embodiment of the invention；
Flow charts of the Fig. 5 for the gamma voltage producing circuit generation gamma voltage of one embodiment of the invention.
Description of reference numerals：
11、12、13：Transistor
11-1、12-1、13-1：First end
11-2、12-2、13-2：Second end
11-3、12-3、13-3：Control end
14：Resistance
15：Switch element
AVDD：Running voltage
GND：Reference voltage
S：Concatenation point
HAOP：Preset gray scale voltage
VBK：Control signal
DS：Data signal
B、B1、B2、B3、B4：Interregnum
A、A1、A2、A3、A4：During display
F、F1、F2、F3、F4：Picture
501：Step
Specific embodiment
Circuit diagrams of the Fig. 1 for the gamma voltage producing circuit of one embodiment of the invention.As shown in figure 1, gamma voltage is produced
Circuit 100 include transistor 11, transistor 12, multiple transistors 13 being mutually in series, multiple resistance 14 being mutually in series and
Switch element 15.Transistor 11 has first end 11-1, the second end 11-2 and control end 11-3.The first end of transistor 11
11-1 is electrically connected at running voltage AVDD.Transistor 12 has first end 12-1, the second end 12-2 and control end 12-3.It is brilliant
Second end 12-2 of body pipe 12 is electrically connected at reference voltage GND.In the present embodiment, reference voltage GND is e.g. grounded, but
It is not limited thereto.Resistance 14 is serially connected between the second end 11-2 and first end 12-1 of transistor 12 of transistor 11, often
Concatenated by concatenating point S mutually between the resistance 14 that one resistance 14 is adjacent.In the present embodiment, running voltage AVDD
And the voltage difference between reference voltage GND carries out partial pressure by the resistance 14 for concatenating and each concatenation point S is exported not
Same gamma voltage.Each transistor 13 has first end 13-1, the second end 13-2 and control end 13-3.Transistor 13
First end 13-1 is electrically connected at preset gray scale voltage HAOP, and the magnitude of voltage of preset gray scale voltage HAOP is between running voltage AVDD
And between reference voltage GND, and the second end 13-2 of transistor 13 is each electrically connected at corresponding concatenation point S.In this reality
Apply in example, the quantity of transistor 13 is equal to the quantity of resistance 14, and the magnitude of voltage of preset gray scale voltage HAOP is equal to work
The meansigma methodss of voltage AVDD and reference voltage GND, but be not limited thereto.Switch element 15 is electrically connected at transistor 11
Control end 13-3 of control end 11-3, control end 12-3 of transistor 12 and transistor 13.In addition, the gal shown in Fig. 1
Agate voltage generation circuit 100 be applied to a kind of display floater (not shown), this kind of display floater to show at least one picture,
During this picture includes one section of interregnum and one section of display.
Sequential charts of the Fig. 2 for the gamma voltage producing circuit of one embodiment of the invention.As shown in Fig. 2 data signal DS table
Show that display floater (not shown) shows a picture, that is, during a frame (frame), provide to the data wire of display floater that (figure is not
Show) signal.An above-mentioned picture, that is, a cycle of data signal DS, include sky in the middle of this cycle
A during white period B and display.Special one is mentioned that, when display floater shows the interregnum B of a picture, data wire
Received is low level data signal DS, now concatenates point S and does not substantially export gamma voltage, and works as display floater and show
During showing the display of a picture during A, received by data wire is data signal DS of high level, now concatenates point S outputs
Gamma voltage is so that display floater shows specific grey menu.
Please jointly with reference to Fig. 1 and Fig. 2, switch element 15 is to receive control signal VBK, and according to the control for being received
Signal V processedBKAnd in interregnum B "off" transistors 11 and transistor 12, and according to control signal V for being receivedBKAnd in sky
White period B conducting transistor 13.Switch element 15 is also according to control signal V for being receivedBKAnd A turns on transistor during display
11 with transistor 12, and according to control signal V that receivedBKAnd during display A "off" transistors 13.When 13 quilt of transistor
During conducting, preset gray scale voltage HAOP can be passed to concatenation point S to export preset gray scale voltage HAOP by concatenating point S.
Specifically, the transistor 11 and transistor 12 in gamma voltage producing circuit 100 shows a picture in display floater
Interregnum B is switched on and off control signal V of the unit 15 according to high levelBKAnd end, therefore running voltage AVDD and reference electricity
The path being not turned between pressure GND, and now switching system 15 is also according to control signal V of high levelBKAnd turn on transistor
13, therefore preset gray scale voltage HAOP will be output to corresponding concatenation point S by transistor 13.By aforesaid operations,
Each concatenation point S in gamma voltage producing circuit 100 can be made all to show that the interregnum B of a picture is defeated in display floater
Go out preset gray scale voltage HAOP, allow full frame to become underloading picture in interregnum, can in accelerated release in vitro liquid crystal residual electric charge,
Thereby improve the picture residual and film flicker problem of display floater.
Sequential charts of the Fig. 3 for the gamma voltage producing circuit of further embodiment of this invention.Identical mark among Fig. 3 and Fig. 2
Number represent identical element or signal.As shown in figure 3, when display floater shows multiple picture F1～F4, such as F1 is expressed as
First picture, F2 are expressed as second picture, and F3 is expressed as the 3rd picture, and F4 is then expressed as the 4th picture, and switch is single
Unit 15 is according to control signal V for being receivedBKAnd in each interregnum B1～B4 "off" transistors 11 and transistor 12, and
According to control signal V for being receivedBKAnd in each interregnum B1～B4 conducting transistors 13, so that gamma voltage produces electricity
Road 100 exports preset gray scale voltage HAOP by each concatenation point in the interregnum B1～B4 of display floater.Switch element
15 also according to control signal V for being receivedBKAnd A1～A4 turns on transistor 11 and transistor 12 during each display, and
According to control signal V for being receivedBKAnd in each display during A1～A4 "off" transistors 13, so as to gamma voltage produce electricity
Road 100 is in the gamma voltage needed for A1～A4 output display pictures during each display of display floater.
Sequential charts of the Fig. 4 for the gamma voltage producing circuit of yet another embodiment of the invention.Identical mark among Fig. 4 and Fig. 2
Number represent identical element or signal.As shown in figure 4, when display floater shows multiple pictures, switch element 15 is according to being connect
Control signal V of receiptsBKAnd at least one interregnum B1～B4 "off" transistors 11 and transistor of the non-conterminous picture
12, and according to control signal V for being receivedBKAnd it is brilliant at least one interregnum B1～B4 conductings of the non-conterminous picture
Body pipe 13, so that at least one interregnum B1～B4 of the gamma voltage producing circuit 100 in display floater is gone here and there by each
Contact S exports preset gray scale voltage HAOP.In the present embodiment, switch element 15 is, for example, according to control signal V for being receivedBK
And in interregnum B1, B3 "off" transistor 11 and transistor 12 and the conducting of first picture F1 and the 3rd picture F3
Transistor 13, so that gamma voltage producing circuit 100 shows first picture F1 and the 3rd picture F3's in display floater
Interregnum B1, B3 export preset gray scale voltage HAOP by corresponding concatenation point S.Switch element 15 is according to the control for being received
Signal VBKAnd A1～A4 turns on transistor 11 and transistor 12 during each display, and according to the control signal for being received
VBKAnd in each display during A1～A4 "off" transistors 13, so that gamma voltage producing circuit 100 is in the every of display floater
During one display, A1～A4 is by the gamma voltage needed for corresponding concatenation point S output display pictures.
Special one is mentioned that, control signal V mentioned in the present inventionBKPersistent period be the same as interregnum B
Persistent period, but the present invention is not limited thereto, control signal VBKPersistent period visual demand and adjust, but be less than
The persistent period of interregnum B.
Flow charts of the Fig. 5 for the gamma voltage producing circuit generation gamma voltage of one embodiment of the invention.As shown in figure 5,
It is above-mentioned that gamma voltage is produced by gamma voltage producing circuit 100, that is, the mode of output preset gray scale voltage HAOP can return
Receive out a main step 501：Control signal is provided to switch element.Opportunity and switch list due to providing control signal
Operation after unit's reception control signal has been described above, therefore is repeated no more.
In sum, gamma voltage producing circuit 100 of the invention employs transistor 11, transistor 12, multiple crystal
Pipe 13, multiple resistance 14 and switch element 15, and control signal is received with the blank in display picture by switch element 15
Period B "off" transistor 11 and transistor 12, stop the normal gamma voltage of output with interior during this period, and interior during this period lead
Logical transistor 13 produces gamma voltage so that preset gray scale voltage HAOP is transferred to corresponding concatenation point S by transistor 13
Circuit 100 exports preset gray scale voltage HAOP, and full frame thus just can be allowed to become underloading picture in interregnum, can add
, there is the situation of flicker to avoid display picture in the electric charge of the transgranular residual of rapid release tapping.
Although the present invention is disclosed as above with preferred embodiment, so which is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little variation can be made with retouching, therefore the protection model of the present invention
Enclose to work as and be defined depending on the defined person of appended claims.
Claims (8)
1. a kind of gamma voltage producing circuit, it is adaptable to which a display floater, the display floater is to show an at least picture, the picture
During face includes an interregnum and a display, the gamma voltage producing circuit includes：
One the first transistor, with a control end, a first end and one second end, the first end of the first transistor is electrical
It is connected to a running voltage；
One transistor seconds, with a control end, a first end and one second end, second end of the transistor seconds is electrical
It is connected to a reference voltage；
Multiple resistance, the plurality of resistance are serially connected with second end of the first transistor and the first end of the transistor seconds
Between, there are between the resistance that each resistance is adjacent a string of contacts；
Multiple third transistor, each third transistor have a control end, a first end and one second end, and the plurality of the
The first end of three transistors is electrically connected at a preset gray scale voltage, and the magnitude of voltage of the preset gray scale voltage is between the work electricity
Between pressure and the reference voltage, and second end of the plurality of third transistor is each electrically connected at the corresponding string
Contact；And
One switch element, the switch element are electrically connected at the control of the control end of the first transistor, the transistor seconds
End processed and the control end of the plurality of third transistor, the switch element is to receive a control signal；
Wherein, the switch element according to the control signal for being received in the interregnum end the first transistor with this
Two-transistor, and the plurality of third transistor, the switch are turned in the interregnum according to the control signal for being received
Unit turns on the first transistor and the transistor seconds, Yi Jiyi during the display according to the control signal for being received
End the plurality of third transistor during the display according to the control signal for being received；
Wherein, when the plurality of third transistor is switched on, the preset gray scale voltage can be passed to the concatenation point to pass through
It is described to concatenate point and export the preset gray scale voltage.
2. gamma voltage producing circuit as claimed in claim 1, wherein, the magnitude of voltage of the preset gray scale voltage is equal to the work
Make the meansigma methodss of voltage and the reference voltage.
3. gamma voltage producing circuit as claimed in claim 1, wherein, when the display floater shows multiple pictures, this is opened
Close unit and end the first transistor and the transistor seconds in each interregnum according to the control signal for being received,
And the plurality of third transistor is turned in each interregnum according to the control signal that received, the switch element according to
The first transistor and the transistor seconds, and foundation are turned on according to the control signal for being received during each display
The control signal that received and end the plurality of third transistor during each display.
4. gamma voltage producing circuit as claimed in claim 1, wherein, when the display floater shows multiple pictures, this is opened
At least one interregnum in non-conterminous picture ends the first transistor according to the control signal for being received to close unit
With the transistor seconds, and at least one interregnum in the non-conterminous picture according to the control signal that received
The plurality of third transistor is turned on, conducting should during each display according to the control signal for being received for the switch element
The first transistor and the transistor seconds, and to end this according to the control signal for being received during each display more
Individual third transistor.
5. gamma voltage producing circuit as claimed in claim 1, wherein, the quantity of the third transistor is equal to the plurality of electricity
The quantity of resistance.
6. a kind of gamma voltage production method, it is adaptable to the gamma voltage producing circuit in a display floater, the display floater
To, during showing that an at least picture, the picture include an interregnum and a display, the gamma voltage producing circuit includes
One the first transistor, a transistor seconds, multiple third transistor, multiple resistance and a switch element, the first transistor
A running voltage is received, the transistor seconds receives a reference voltage, the plurality of resistance is serially connected with the first transistor and is somebody's turn to do
Between transistor seconds and with multiple concatenation points, the plurality of third transistor receives a preset gray scale voltage, the switch element
It is electrically connected at the first transistor, the transistor seconds and the plurality of third transistor and decides whether conducting the plurality of the
Three transistors are so that the gray scale voltage is exported to the concatenation point, the gamma voltage production method by the plurality of third transistor
Including：
A control signal is provided to the switch element；
Wherein, the switch element ends the first transistor and second crystal according to the control signal in the interregnum
Pipe, the switch element turn on the plurality of third transistor according to the control signal in the interregnum；
Wherein, the switch element turns on the first transistor and second crystal according to the control signal during the display
Pipe, the switch element end the plurality of third transistor according to the control signal during the display.
7. gamma voltage production method as claimed in claim 6, wherein, when the display floater shows multiple pictures, this is opened
Close unit and end the first transistor and the transistor seconds in each interregnum according to the control signal for being received,
And the plurality of third transistor is turned in each interregnum according to the control signal that received, the switch element according to
The first transistor and the transistor seconds, and foundation are turned on according to the control signal for being received during each display
The control signal that received and end the plurality of third transistor during each display.
8. gamma voltage production method as claimed in claim 6, wherein, when the display floater shows multiple pictures, this is opened
At least one interregnum in non-conterminous picture ends the first transistor according to the control signal for being received to close unit
With the transistor seconds, and at least one interregnum in the non-conterminous picture according to the control signal that received
The plurality of third transistor is turned on, conducting should during each display according to the control signal for being received for the switch element
The first transistor and the transistor seconds, and to end this according to the control signal for being received during each display more
Individual third transistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104100448A TWI527020B (en) | 2015-01-07 | 2015-01-07 | Circuit and method for generating gamma voltage |
| TW104100448 | 2015-01-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104700800A CN104700800A (en) | 2015-06-10 |
| CN104700800B true CN104700800B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510127519.0A Expired - Fee Related CN104700800B (en) | 2015-01-07 | 2015-03-23 | Gamma voltage generation circuit and gamma voltage generation method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104700800B (en) |
| TW (1) | TWI527020B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934007A (en) * | 2015-07-06 | 2015-09-23 | 合肥京东方光电科技有限公司 | Data line driving method and unit, source electrode driver, panel driving apparatus and display apparatus |
| CN106409256B (en) * | 2016-11-03 | 2019-04-05 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN107369427A (en) * | 2017-09-21 | 2017-11-21 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN108682403B (en) * | 2018-04-28 | 2020-08-04 | 昆山龙腾光电股份有限公司 | Gamma voltage switching device and liquid crystal display device |
| US11373607B2 (en) | 2020-03-16 | 2022-06-28 | Novatek Microelectronics Corp. | Display device and driving method thereof for reducing flicker due to refresh rate variation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1437084A (en) * | 2002-02-08 | 2003-08-20 | 精工爱普生株式会社 | Reference voltage generating circuit and method, display drive circuit and display device |
| CN1437085A (en) * | 2002-02-08 | 2003-08-20 | 精工爱普生株式会社 | Reference voltage generating circuit and generating method, display drive circuit and display |
| CN101311782A (en) * | 2007-05-25 | 2008-11-26 | 奇美电子股份有限公司 | Gray scale voltage generation circuit and its operation method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030073390A (en) * | 2002-03-11 | 2003-09-19 | 삼성전자주식회사 | A liquid crystal display for improving dynamic contrast and a method for generating gamma voltages for the liquid crystal display |
| KR20110050057A (en) * | 2009-11-06 | 2011-05-13 | 엘지디스플레이 주식회사 | Organic electroluminescent display device and methods of driving and manufacturing the same |
-
2015
- 2015-01-07 TW TW104100448A patent/TWI527020B/en not_active IP Right Cessation
- 2015-03-23 CN CN201510127519.0A patent/CN104700800B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1437084A (en) * | 2002-02-08 | 2003-08-20 | 精工爱普生株式会社 | Reference voltage generating circuit and method, display drive circuit and display device |
| CN1437085A (en) * | 2002-02-08 | 2003-08-20 | 精工爱普生株式会社 | Reference voltage generating circuit and generating method, display drive circuit and display |
| CN101311782A (en) * | 2007-05-25 | 2008-11-26 | 奇美电子股份有限公司 | Gray scale voltage generation circuit and its operation method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI527020B (en) | 2016-03-21 |
| CN104700800A (en) | 2015-06-10 |
| TW201626353A (en) | 2016-07-16 |
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