CN107610662B - A kind of liquid crystal display - Google Patents
A kind of liquid crystal display Download PDFInfo
- Publication number
- CN107610662B CN107610662B CN201710863661.0A CN201710863661A CN107610662B CN 107610662 B CN107610662 B CN 107610662B CN 201710863661 A CN201710863661 A CN 201710863661A CN 107610662 B CN107610662 B CN 107610662B
- Authority
- CN
- China
- Prior art keywords
- module
- liquid crystal
- gain
- crystal display
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention proposes a kind of liquid crystal display, including liquid crystal display, driving unit, control unit, by using gain setting module in a control unit, according to the temperature of driving unit, gain is set, control source electrode driving unit is added in the voltage amplitude in the pixel of liquid crystal display, to inhibit the rising of source drive cell temperature, while guaranteeing image definition, the performance of lifting system reduces system power dissipation.
Description
Technical field
The invention belongs to technical field of liquid crystal display, especially a kind of liquid crystal display.
Background technique
In recent years, liquid crystal display device is widely used in display field.Liquid crystal display device mainly passes through source drive
Unit application pixel voltage cooperates drive element of the grid to realize and realizes the scanning of image to the switch of TFT and show to pixel electrode
Show.Liquid crystal display panel is made of a plurality of controlling grid scan line, source signal line and tft array.Liquid crystal display source signal line
Equivalent circuit includes line impedance, and TFT gate capacitor is routed capacitor between layer capacitance and wiring layer and liquid crystal layer.Therefore,
In a row period, the change of received image signal causes capacitor to repeat to be charged and discharged, so that electric current increase causes
The temperature of driving unit rises.It will lead to the performance of driving unit when the temperature of driving unit is more than the temperature operated normally
Decline.It is mentioned in existing document report when the temperature of the chip of driving unit rises to equal to or higher than predetermined temperature, is led to
The output voltage for reducing maximum gamma correction is crossed, the voltage amplitude that driving unit is applied in pixel is reduced.
When constant in the period in fact, the picture signal of input is expert at, capacitor does not carry out charge and discharge, the temperature of driving unit
Degree will not rise.That is, not needing the amplitude of reduction voltage when there is stable maximum Gamma voltage output.It is existing
The reduction that the output voltage of maximum Gamma correction is mentioned in some reports is unrelated with the change of received image signal.Therefore, i.e.,
Make not needing to reduce voltage amplitude, but driving unit is applied to the voltage amplitude in pixel and is also reduced by.In short, existing skill
Art is difficult the voltage amplitude being applied in pixel by the change control driving unit of received image signal.
Summary of the invention
Technical problem solved by the invention is to provide a kind of liquid crystal display, by a control unit using increasing
Gain is arranged according to the temperature of driving unit for beneficial setup module, and control source electrode driving unit is added in the voltage amplitude in pixel,
To inhibit the rising of source drive cell temperature, while guaranteeing image definition, the performance of lifting system reduces system
Power consumption.
The technical solution for realizing the aim of the invention is as follows:
A kind of liquid crystal display, comprising: liquid crystal display, including source signal line, gate line, connection source electrode
The pixel of signal wire and gate line, for showing the image of received image signal；
Driving unit, including source drive unit and drive element of the grid connect with source signal line, gate line respectively
It connects, for the voltage of received image signal to be applied to the pixel of the liquid crystal display；
Control unit, the voltage magnitude being applied in pixel for controlling driving unit, including filter module, temperature letter
Breath obtains module, addition module, multiplier module and gain setting module, wherein temperature information obtains module for obtaining source electrode
The temperature information of driving unit is simultaneously supplied to gain setting module, gain setting module for set gain and by gain export to
Multiplier module, filter module be used to obtain high fdrequency component and low frequency component of the received image signal on source signal line and point
It Shu Chu not be used to export the product of gain and high fdrequency component to addition module to multiplier module and addition module, multiplier module,
Addition module, which is used to that product and low frequency component to be summed and be exported, gives source drive unit.
Further, liquid crystal display of the invention, driving unit apply in a frame the voltage of identical polar to
In the pixel of source signal line connection.
Further, liquid crystal display of the invention, the filter module include high-pass filter and low-pass filtering
Device, wherein high-pass filter exports high fdrequency component of the picture signal on source signal line direction, and low-pass filter exports image
Low frequency component of the signal on source signal line direction.
Further, liquid crystal display of the invention, the low-pass filter are the digital filter of 1:2:1.
Further, liquid crystal display of the invention, the high-pass filter are the digital filter of -1:2:-1.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1, liquid crystal display of the invention can reduce according to the change of received image signal and be applied to source signal line
Voltage magnitude, control the amplitude of voltage, to reduce the temperature of source drive unit, the performance of lifting system reduces system
Power consumption；
2, liquid crystal display of the invention sets reasonable gain by gain setting unit, so that intermediate gray-scale areas
The voltage amplitude reduction range being applied in pixel is smaller, therefore can guarantee to guarantee while reducing the temperature of source cell
The clarity of image is unaffected.
Detailed description of the invention
Fig. 1 is the unit module schematic diagram of the liquid crystal display of one embodiment；
Fig. 2 is the polarity schematic diagram of the liquid crystal voltage under column inversion mode；
Fig. 3 is the schematic diagram of voltage on the white field source signal line of liquid crystal display；
Fig. 4 is low-pass filter and high-pass filter frequency characteristic schematic diagram；
Fig. 5 is the gain curve schematic diagram of gain setting unit；
Fig. 6 is the schematic diagram that the every row of liquid crystal display panel alternately displays Bai Chang and black field；
The voltage waveform view that Fig. 7 is gain setting unit gain when being reference gain on source signal line；
Fig. 8 is voltage waveform view when gain is less than reference gain on source signal line；
Fig. 9 is the unit module schematic diagram of the liquid crystal display of second embodiment；
Figure 10 is the gain curve schematic diagram of grayscale gain unit；
Figure 11 is to apply voltage characteristic schematic diagram on liquid crystal.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
A kind of liquid crystal display, comprising: liquid crystal display, including source signal line, gate line, connection source electrode
The pixel of signal wire and gate line, for showing the image of received image signal；
Driving unit, including source drive unit and drive element of the grid connect with source signal line, gate line respectively
It connects, for the voltage of received image signal to be applied to the pixel of the liquid crystal display；Driving unit is applied in a frame
Add on the voltage of identical polar to the pixel being connect with source signal line；
Control unit, the voltage magnitude being applied in pixel for controlling driving unit, including filter module, temperature letter
Breath obtains module, addition module, multiplier module and gain setting module, wherein temperature information obtains module for obtaining source electrode
The temperature information of driving unit is simultaneously supplied to gain setting module, gain setting module for set gain and by gain export to
Multiplier module, filter module be used to obtain high fdrequency component and low frequency component of the received image signal on source signal line and point
It Shu Chu not be used to export the product of gain and high fdrequency component to addition module to multiplier module and addition module, multiplier module,
Addition module, which is used to that product and low frequency component to be summed and be exported, gives source drive unit；The filter module includes high pass filter
Wave device and low-pass filter, wherein low-pass filter is the digital filter of 1:2:1, exports picture signal in source signal line side
Upward low frequency component, high-pass filter are the digital filter of -1:2:-1, export picture signal on source signal line direction
High fdrequency component.
Embodiment 1
A kind of liquid crystal display, the main control realized by control unit to driving unit realize that liquid crystal display panel is aobvious
Show.The driving unit includes source drive unit and drive element of the grid, according to received image signal and field sync signal control
Drive element of the grid processed selects to open and close thin film transistor (TFT) (TFT) by gate line line by line, and cooperates source drive
Unit is applied the voltage in pixel by source signal line, and control liquid crystal display panel is shown.For liquid crystal display, adopt
It will lead to liquid crystal molecule with direct voltage drive to overturn in one direction for a long time, eventually lead to the performance of liquid crystal display panel by shadow
Ring, therefore this programme is using the voltage driving mode of exchange, different frame realize polar overturning can with effective solution this
Problem.In the present embodiment, in a certain frame, source signal line S1 polarity is ﹢, S2 polarity is-, in the next frame, S1 at this time
Polarity is-, the polarity of S2 is ﹢, polar overturning is realized, as shown in Fig. 2, polarity controlling party of the present embodiment using column overturning
Formula.Further, since source signal line S1 is applied identical positive polarity voltage, when liquid crystal display panel shows complete white image
When, even if the gatings such as gate line G1, G2 change, being applied to the polarity of voltage and level in pixel will not change, such as
Shown in Fig. 3.Thus, due to not being charged and discharged in thin film transistor (TFT) Q, so that source drive unit be inhibited to supply film
The electric current of transistor Q.Finally, since the lower power consumption of source drive unit, source drive cell temperature will not rise.
As shown in Figure 1, control unit includes that temperature information obtains module, filter module, gain setting module, multiplication modulo
Block and addition module, the filter module include a high-pass filter and low-pass filter, and the multiplier module multiplies for one
Musical instruments used in a Buddhist or Taoist mass, addition module are an adder.In the present embodiment, temperature information acquiring unit is estimated according to the frequency and amplitude of input signal
The temperature information of source drive unit is calculated, or obtains the temperature information of source drive unit by temperature sensor, and
Temperature information is supplied to gain setting unit.Low-pass filter exports the picture signal low frequency on source signal line direction point
Amount, likewise, high-pass filter exports high fdrequency component of the picture signal on source signal line direction.Gain setting unit according to
Gain is arranged in the temperature information of source drive unit, and the gain of setting is output in multiplier.Increasing of the multiplier to setting
Benefit and high fdrequency component carry out product, and the result of product are output in adder, adder to the output result of multiplier and
Low frequency component is summed, and the result of summation is output to source drive unit as picture output signal.If Fig. 4 is filtering
The frequency characteristic of device, when input signal picture signal is identical with output picture signal, the gain of gain setting unit is set as
Reference gain Gr.Wherein, low-pass filter uses the digital filter of 1:2:1, the number filter of high-pass filter use -1:2:-1
Wave device.
As shown in figure 5, the temperature of the preset gain curve GC0 of gain setting unit and source drive unit is opposite
It answers, when the temperature of source drive unit is lower than predetermined temperature Tr (Tr=70 DEG C), gain setting unit is by gain G a
Value be set as reference gain Gr (Gr=1).When the temperature of source drive unit is greater than or equal to reference temperature Tr, gain is set
Order member will reduce Ga value.In the range of the temperature of source drive unit is greater than or equal to reference temperature Tr, gain G a is by line
Property decline or be presented stepped reduced trend.As shown in fig. 6, when black and white field picture interlaced alternative is shown, source drive
Unit is applied to the voltage on source signal line and will fluctuate.When the temperature of source drive unit is lower than reference temperature,
That is gain G a=Gr=1, the picture signal of adder output are equal to the picture signal of input, the voltage amplitude on source signal line
For normal value, as shown in Figure 7.The present embodiment sets V=V1 as the corresponding voltage in white field, and V=0 corresponds to the voltage of black field.When
For black and white field when certain a line alternately displays, the duplicate movement charged and discharged of capacitor at this time will will lead to source drive list
The temperature of member rises.When the temperature of source drive unit is greater than or equal to reference temperature Tr, gain setting unit is set at this time
Gain G a is less than reference gain, such as sets gain G a=0.5.Therefore, the output valve of the multiplier is dropped by gain G a
The value that low input-signal is obtained in the high fdrequency component of vertical direction.Therefore, the white field voltage being applied on source signal line
It is reduced to V11 from V1, black field voltage has risen to V12 from 0.White field is made to be applied to the voltage in pixel in this way
It reduces, black field is applied to the raising of the voltage in pixel.Therefore, source drive unit is applied to the voltage amplitude in pixel and obtains
Reduce.
Output picture signal is generated by the high fdrequency component output valve and low frequency component output valve of received image signal, when
When the high fdrequency component of received image signal is larger, as shown in fig. 7, can suitably reduce the amplitude for being applied to the voltage of pixel,
As shown in figure 8, the amplitude for being applied to the voltage of pixel hardly drops when the high fdrequency component of received image signal is close to zero
It is low.In this way, according to the variation of received image signal, it can suitably control and pixel is applied to by source driving unit
The amplitude of voltage, to inhibit the rising of source drive cell temperature.In one embodiment of the invention, it is arranged by gain
The setting of the gain G a of unit reduces the high frequency component values of received image signal and is summed to obtain with the low frequency component of image
The picture signal of output.Therefore, it may be implemented to reduce source drive unit to pixel by the simple circuit design of control unit
Apply alive amplitude, without change source drive unit circuit design.In one embodiment of the invention,
The amplitude for the voltage being applied in pixel is reduced according to the product of the output of high-pass filter and setting gain.Therefore, white field
Voltage reduce, the voltage of black field increases.Therefore the average value of voltage shown in the average value and Fig. 8 of voltage as shown in Figure 7 is almost
It is equal.Since the average value of brightness does not change, therefore it can effectively inhibit the decline of image displaying quality.
Embodiment 2
A kind of liquid crystal display, including liquid crystal display, driving unit and control unit, wherein control unit include
Filter cell and grayscale gain setting unit.Filter cell includes low-pass filter and high-pass filter, low-pass filter
The low frequency component for obtaining received image signal exports the average value of the received image signal level in vertical direction.Ash
Rank gain setting unit includes 4 gain curves, and respectively Gc1~Gc4, as shown in Figure 10, gain curve is preset and source
The temperature of pole driving unit and the level of received image signal are corresponding.When the temperature T of source drive unit meets T < Tr relationship
When, the grayscale gain setting unit uses gain curve Gcl；As Tr≤T < T1, using Gc2；As Tl≤T < T2, use
Gc3；As T2≤T < T3, wherein when Tr < T1 < T2 < T3, using gain curve Gc4.The corresponding driving unit temperature of gain curve Gc1
It spends T and is lower than reference temperature Tr.As shown in Figure 10, the gain of gain curve Gcl is the signal level of one with received image signal
Unrelated reference gain Gr (Gr=1), when received image signal level is maximum gray (8bit 255) and minimum gray Lmin
(8bit 0) sets the gain G a of Gc2 to Gc4 as minimum value.When the level of input signal is in intermediate grayscale (128), if
Determining gain G a is maximum value；When the signal level of received image signal is intermediate grayscale Lmid, gain curve Gc2 to Gc4 is set
Gain G a be equal to reference gain Gr.Grayscale gain setting unit from Gc2 to Gc4 in selection one specifically with source drive list
The corresponding gain curve of first temperature information, according to selected gain curve, grayscale gain setting unit obtains and input picture
The corresponding gain G a of the average value of signal level, and Ga is input in multiplier.
In the present embodiment, the minimum value of minimum gray Lmin representation signal level, maximum gray scale Lmax representation signal level
Maximum value, the median of middle gray Lmid representation signal level.As shown in figure 11, in the signal level of received image signal
For in the region of low ash rank (low-light level) and high gray (high brightness), as the signal level of received image signal increases, liquid crystal
Application voltage steeply rise.In the region that the signal level of received image signal is intermediate grayscale intermediate luminance, to liquid crystal
Application voltage slowly rise with the rising of the signal level of received image signal.
When the signal level in input picture makes phase in intermediate gray-scale areas, low gray-scale areas and high gray region respectively
When the output valve that same gain G a reduces high-pass filter realizes the amplitude of drop low applied voltage, as shown in figure 11, due to input
The signal level of picture signal is smaller than low ash rank and high gray region in the fluctuation range of the voltage of intermediate gray-scale areas, voltage
The decline range of amplitude also very little.Therefore, the effect that temperature caused by the reduction of the amplitude of the region voltage of middle gray reduces
The effect reduced not as good as low ash degree and the regional temperature of high gray scale is good.As shown in Figure 10, in the present embodiment, gain curve Gc2 is extremely
Gc4 is separately arranged as increasing so that when the signal level of received image signal is minimum gray Lmin and maximum gray Lmax
Beneficial Ga is minimum value；When for middle gray Lmid, gain G a is maximum value.The gain curve Gc2 to Gc4 is arranged to
So that gain G a is a lesser value near the grayscale Lmid of near minimum gray Lmin and maximum gray Lmax and centre.
As described above, the gain curve Gc2 to Gc4 of grayscale gain setting unit is provided so that gain in the present embodiment
Ga is lesser one value, therefore, the signal level of received image signal can be greatly reduced in low ash rank and high gray area
The amplitude of voltage inhibits the rising of source drive cell temperature in domain.Meanwhile being applied to the reduction of the voltage amplitude in pixel simultaneously
It is unobvious.It is close to reference gain Gr that the gain curve Gc2 to Gc4, which is arranged to the gain G a near middle gray Lmid,
Value, further, intermediate grayscale Lmid gain G a be equal to reference gain Gr.Therefore, because the reduction meeting of voltage amplitude
The apparent clarity for reducing image reduces range since the region near intermediate grayscale Lmid is applied to voltage amplitude in pixel
It is smaller, therefore the clarity of image will not be reduced significantly.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement should be regarded as guarantor of the invention
Protect range.
Claims (5)
1. a kind of liquid crystal display, comprising:
Liquid crystal display, the pixel including source signal line, gate line, connection source signal line and gate line,
For showing the image of received image signal；
Driving unit, including source drive unit and drive element of the grid, connect with source signal line, gate line respectively,
For the voltage of received image signal to be applied to the pixel of the liquid crystal display；
It is characterized in that, further include control unit, the voltage magnitude being applied in pixel for controlling driving unit, including filtering
Device module, temperature information obtain module, addition module, multiplier module and gain setting module, wherein temperature information obtains module
For obtaining the temperature information of source drive unit and being supplied to gain setting module, gain setting module is for setting gain simultaneously
Gain is exported to multiplier module, filter module for obtain high fdrequency component of the received image signal on source signal line and
Low frequency component is simultaneously exported respectively to multiplier module and addition module, and multiplier module is used to export the product of gain and high fdrequency component
To addition module, addition module, which is used to that product and low frequency component to be summed and be exported, gives source drive unit.
2. liquid crystal display according to claim 1, which is characterized in that driving unit applies identical polar in a frame
Voltage to the pixel being connect with source signal line on.
3. liquid crystal display according to claim 1, which is characterized in that the filter module includes high-pass filter
And low-pass filter, wherein high-pass filter exports high fdrequency component of the picture signal on source signal line direction, low-pass filtering
Device exports low frequency component of the picture signal on source signal line direction.
4. liquid crystal display according to claim 3, which is characterized in that the low-pass filter is the number of 1:2:1
Filter.
5. liquid crystal display according to claim 3, which is characterized in that the high-pass filter is the number of -1:2:-1
Word filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710863661.0A CN107610662B (en) | 2017-09-22 | 2017-09-22 | A kind of liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710863661.0A CN107610662B (en) | 2017-09-22 | 2017-09-22 | A kind of liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107610662A CN107610662A (en) | 2018-01-19 |
| CN107610662B true CN107610662B (en) | 2019-11-05 |
Family
ID=61061562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710863661.0A Active CN107610662B (en) | 2017-09-22 | 2017-09-22 | A kind of liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107610662B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275085C (en) * | 2001-10-23 | 2006-09-13 | 松下电器产业株式会社 | Liquid crystal display device and drive method thereof |
| KR101599351B1 (en) * | 2007-09-28 | 2016-03-15 | 삼성디스플레이 주식회사 | Liquid crystal display and driving method of the same |
| KR101429918B1 (en) * | 2008-02-26 | 2014-08-13 | 엘지디스플레이 주식회사 | Liquid crystal display |
| CN101840679B (en) * | 2010-02-02 | 2012-06-06 | 苏州汉朗光电有限公司 | Temperature self-adaptation drive method for smectic state liquid crystal display screen |
| TWI549430B (en) * | 2011-03-30 | 2016-09-11 | 友達光電股份有限公司 | Constant voltage regulator with temperature compensation |
| CN105070261A (en) * | 2015-08-26 | 2015-11-18 | 武汉华星光电技术有限公司 | Liquid crystal display module group and voltage adjusting method thereof |
-
2017
- 2017-09-22 CN CN201710863661.0A patent/CN107610662B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107610662A (en) | 2018-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4083258B2 (en) | Display device and row selection line scanner thereof | |
| TWI398846B (en) | Liquid crystal display and dimming controlling method thereof | |
| JP4683837B2 (en) | Liquid crystal display device having a plurality of gradation voltages, driving device and method thereof | |
| US8022910B2 (en) | Liquid crystal display and driving method thereof | |
| CN101303491B (en) | Liquid crystal display apparatus and drive method thereof | |
| KR101677182B1 (en) | Method of dimming backlight assembly | |
| KR102060604B1 (en) | Luminance adjusting part, display apparatus having the same and method of adjusting luminance using the same | |
| US20080266222A1 (en) | Liquid crystal display having common voltage compensating circuit and driving method thereof | |
| KR20080089995A (en) | Driving apparatus for display device, display device including the same and driving method of display device | |
| JP2006171746A (en) | Display device and driving device therefor | |
| CN109727587B (en) | Liquid crystal display for improving bright and dark bands caused by backlight frequency change | |
| JP2007025684A (en) | Display device and method for correcting video signal | |
| JP2007213056A (en) | Display device and driving device therefor | |
| CN113692612A (en) | Display device, method of driving display device, and electronic apparatus | |
| US20120169784A1 (en) | Liquid crystal display apparatus and method for driving the same | |
| US8659528B2 (en) | Electro-optical device driven by polarity reversal during each sub-field and electronic apparatus having the same | |
| CN101546542B (en) | Liquid crystal display device, liquid crystal display method, display control device, and display control method | |
| TWI300206B (en) | Liquid crystal display device and method of driving the same | |
| US8643682B2 (en) | Method for driving a light source, light source apparatus for performing the method and display apparatus having the light source apparatus | |
| CN107610662B (en) | A kind of liquid crystal display | |
| US10192499B2 (en) | Driving device for liquid crystal panel and driving method for the same for determining if amplifying original data voltages in a scanning direction | |
| CN111462709A (en) | Display panel driving device and method and display panel | |
| CN114822435B (en) | Driving circuit of display panel, display and common voltage adjusting method | |
| US7292211B2 (en) | Liquid crystal display and driving circuit thereof | |
| CN114220403B (en) | Display panel driving circuit, control method thereof and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |