CN108597464A - control device and control method for liquid crystal display - Google Patents
control device and control method for liquid crystal display Download PDFInfo
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- CN108597464A CN108597464A CN201810250519.3A CN201810250519A CN108597464A CN 108597464 A CN108597464 A CN 108597464A CN 201810250519 A CN201810250519 A CN 201810250519A CN 108597464 A CN108597464 A CN 108597464A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 210000001367 artery Anatomy 0.000 claims 2
- 210000003462 vein Anatomy 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 101100438536 Nicotiana plumbaginifolia CABC gene Proteins 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- 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
- G09G3/3406—Control of illumination source
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a kind of control devices for liquid crystal display, including：Signal connector is for receiving vision signal and the first pulse width modulating signal；It includes field sync signal that sequence controller, which is used to generate gate drive signal and source drive signal, gate drive signal according to vision signal,；Wherein, sequence controller is additionally operable to that the first pulse width modulating signal is converted into the second pulse width modulating signal with field sync signal at frequency multiplication according to field sync signal.The present invention also provides a kind of control methods for liquid crystal display, the first pulse width modulating signal is converted into the second pulse width modulating signal with field sync signal at frequency multiplication by sequence controller, eliminates water ripple phenomenon caused by the phase interference for exchanging public voltage signal and backlight pwm signal identical with the phase of field sync signal under narrow viewing angle pattern.
Description
Technical field
The invention belongs to display technology field, more particularly, to a kind of control device for liquid crystal display and
Control method.
Background technology
Liquid crystal display (Liquid Crystal Display, LCD) has many advantages, such as frivolous, energy saving, radiationless,
Therefore traditional cathode-ray tube (CRT) display has been gradually replaced.Liquid crystal display is widely used in high definition at present
The electronics such as clear DTV, desktop computer, personal digital assistant (PDA), laptop, mobile phone, digital camera are set
In standby.
Fig. 1 shows the structural schematic diagram of the liquid crystal display of the prior art.As shown in Figure 1, liquid crystal display includes aobvious
Show panel 100, signal connector 210, sequence controller 220, display driver circuit 230, backlight drive circuit 240 and backlight
Module 300.Wherein, signal connector 210 receives the external vision signal transmitted and pulse width modulation (Pulse
Width Modulation, PWM) signal, when sequence controller 220 exports gate driving circuit according to the vision signal received
Sequential signal, source electrode drive circuit clock signal and data-signal, field sync signal and other function signals.Display driver circuit
230 include gate driving circuit 231 and source electrode drive circuit 232.231 corresponding clock signal of gate driving circuit includes：
(output enable signal, controls opening for grid by CPV (clock signal), STV (initial pulse signal makees field sync signal use), OE
It closes)；232 corresponding clock signal of source electrode drive circuit includes：TP (latch pulse), POL (polarity upset signal).Backlight drive
Circuit 240 generates backlight drive signal according to pwm signal, controls switch time and the light levels of backlight module 300.
Existing liquid crystal display has mixing visual angle (Hybird Viewing Angle, HVA), and wide viewing angle may be implemented
Switching between (Wide Viewing Angle, WVA) and narrow viewing angle (Narrow Viewing Angle, NVA).
Under narrow viewing angle pattern, the frequency and above-mentioned STV that load the exchange public voltage signal on display panel 100 are believed
Number phase be synchronous, when the phase of the ac voltage signal is asynchronous with the phase of pwm signal, the vision of human eye can be by
In the nonsynchronous reason of the two phase, it is easy to see band scintillation on display picture, is commonly called as water ripples.Moreover, dynamic
Under state backlight control pattern (Dynamic Backlight Control, DBC) or content corresponds to backlight control (Content
Adaptive Brightness Control, CABC) grid of pwm signal and sequence controller Tcon outputs that export under pattern
Pole frame starting impulse STV signals do not synchronize, and affect the quality that picture is shown.
Invention content
The purpose of the present invention is to provide a kind of control devices and control method for liquid crystal display.
According to an aspect of the present invention, a kind of control device for liquid crystal display, the liquid crystal display packet are provided
Display panel and backlight module are included, including：Signal connector, for receiving vision signal and the first pulse width modulation letter
Number；Sequence controller, for generating gate drive signal and source drive signal according to the vision signal, wherein described
Gate drive signal includes field sync signal；Display driver circuit, for according to the gate drive signal and source drive
Signal driving display panel shows the corresponding image of the vision signal；Wherein, the sequence controller is additionally operable to according to
First pulse width modulating signal is converted into wide at the second pulse of frequency multiplication with the field sync signal by field sync signal
Spend modulated signal；Backlight drive circuit for generating backlight drive signal according to the second pulse width modulating signal, and exports extremely
The backlight module.
Preferably, the frequency of second pulse width modulating signal is the integral multiple of field sync signal frequency.
Preferably, the sequence controller includes：Signal conversion module is driven for generating grid according to the vision signal
Dynamic signal and source drive signal；Wherein, the gate drive signal includes field sync signal；Frequency acquisition module is used for
Obtain the frequency of field sync signal；Pulse width modulation module, for according to the frequency of the field sync signal and prestoring
First pulse width signal is converted into third pulse width modulating signal by frequency multiplication；Synchronization module is used for the third
Pulse width modulating signal is synchronized with the field sync signal to export the second pulse width modulating signal.
Preferably, the sequence controller further includes memory, and for storing frequency multiplication, the frequency multiplication is positive integer.
Preferably, the display driver circuit includes：Gate driving circuit, described in being driven according to gate drive signal
The grid of display panel；Source electrode drive circuit, for exporting corresponding grayscale to the display panel according to source drive signal
Voltage.
Preferably, second pulse width modulating signal is at least delayed 200ms than the vision signal.
Preferably, the period of the field sync signal is less than 100ms.
According to another aspect of the present invention, a kind of control method for liquid crystal display is provided, including：Signal connector
The external vision signal provided and the first pulse width modulating signal are provided；Sequence controller generates grid according to vision signal
Drive signal and source drive signal, wherein the gate drive signal includes field sync signal；Display driver circuit according to
The gate drive signal and source drive signal driving display panel show the corresponding image of the vision signal；Sequential control
First pulse width modulating signal is converted into the field sync signal into frequency multiplication by device processed according to the field sync signal
The second pulse width modulating signal；Backlight drive circuit generates backlight drive signal according to the second pulse width modulating signal,
And it exports to the backlight module.
Preferably, the frequency of the second pulse width modulating signal is the integral multiple of field sync signal frequency.
Preferably, sequence controller according to the field sync signal by first pulse width modulating signal be converted into
The field sync signal includes at the second pulse width modulating signal of frequency multiplication：Obtain the frequency of field sync signal；According to described
First pulse width signal is converted into third pulse width modulation letter by the frequency of field sync signal and the frequency multiplication to prestore
Number；The third pulse width modulating signal and the field sync signal are synchronized and believed with exporting the modulation of the second pulse width
Number.
Control device and control method provided in an embodiment of the present invention for liquid crystal display, will by sequence controller
First pulse width modulating signal is converted into the second pulse width modulating signal at frequency multiplication with field sync signal, is used in display
Field sync signal frequency and frequency phase-difference for the pulse width modulating signal that adjusts backlight it is larger, and then eliminate narrow regard
Under angle mould formula caused by the phase interference for exchanging public voltage signal and backlight pwm signal identical with the phase of field sync signal
Water ripple phenomenon.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the structure diagram of liquid crystal display in the prior art；
Fig. 2 shows the structure diagrams of liquid crystal display according to the ... of the embodiment of the present invention.
Fig. 3 shows the structure diagram of sequence controller in liquid crystal display according to the ... of the embodiment of the present invention；
Fig. 4 shows the time diagram of pwm signal and STV signal according to the ... of the embodiment of the present invention.
Fig. 5 shows the flow chart of the control method according to the ... of the embodiment of the present invention for liquid crystal display；
Fig. 6 shows the flow chart of step S04 in the control method according to the ... of the embodiment of the present invention for liquid crystal display.
Specific implementation mode
Hereinafter reference will be made to the drawings is more fully described various embodiments of the present invention.In various figures, identical element
It is indicated using same or similar reference numeral.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 2 shows the structure diagrams of liquid crystal display according to the ... of the embodiment of the present invention；Fig. 3 is shown according to of the invention real
Apply the structure diagram of sequence controller in the liquid crystal display of example；Fig. 4 show pwm signal according to the ... of the embodiment of the present invention and
The time diagram of STV signals；Fig. 5 shows the flow of the control method according to the ... of the embodiment of the present invention for liquid crystal display
Figure；Fig. 6 shows the flow chart of step S04 in the control method according to the ... of the embodiment of the present invention for liquid crystal display.
As shown in Fig. 2, the liquid crystal display include display panel 100, signal connector 210, sequence controller 220,
Display driver circuit 230, backlight drive circuit 240 and backlight module 300.
Wherein, signal connector 210 receives the external vision signal transmitted and the first pulse width modulating signal
(i.e. PWM1 signals).
In the present embodiment, vision signal and PWM1 signals are sent to sequence controller 220 by signal connector 210.
Sequence controller 220 generates gate drive signal and source drive signal according to vision signal, wherein grid drives
Dynamic signal includes field sync signal (STV signal).
Display driver circuit 230 is used for aobvious according to the gate drive signal and source drive signal driving display panel
Show the corresponding image of the vision signal.
In this example it is shown that driving circuit 230 includes gate driving circuit 231 and source electrode drive circuit 232.Grid
Pole driving circuit 231 is used to drive the grid of the display panel 100 according to gate drive signal；Source electrode drive circuit 232 is used
In exporting corresponding gray scale voltage to the display panel 100 according to source drive signal.
Sequence controller 220 is also according to the field sync signal (STV signals) by first pulse width modulating signal
(PWM1 signals) is converted into the second pulse width modulating signal (PWM2 signals) at frequency multiplication with the field sync signal.
In the present embodiment, the frequency of second pulse width modulating signal is the integral multiple of field sync signal frequency,
That is the frequency of PWM2 signals is the integral multiple (as shown in Figure 4) of STV signals.
As shown in figure 3, the sequence controller 220 is wide including signal conversion module 221, frequency acquisition module 222, pulse
Spend modulation module 223 and synchronization module 224.Wherein, signal conversion module 221 is used to generate grid according to the vision signal
Drive signal and source drive signal, wherein gate drive signal includes field sync signal (STV signal)；Frequency acquisition mould
Block 222 is used to obtain the frequency of field sync signal；Pulse width modulation module 223 is used for according to the field sync signal (STV letters
Number) frequency and the frequency multiplication that prestores first pulse width signal (PWM1 signals) is converted into the modulation of third pulse width
Signal (PWM3 signals)；Synchronization module 224 is used for the third pulse width modulating signal (PWM3 signals) is same with the field
Step signal is synchronized to export the second pulse width modulating signal (PWM2 signals).
Specifically, frequency acquisition module 222 obtains the two adjacent time between rising edge or failing edge of STV signals
That is cycle T, and then obtain the frequency F (F=1/T) of STV signals.Pulse width modulation module 223 is according to the frequency F of STV signals
And the frequency multiplication n to prestore obtains the frequency (Fp=nF=n/T) of PWM3, the cycle T p=1/Fp=T/n of PWM3, according to PWM3's
PWM1 signals are converted into PWM3 signals by cycle T p in turn.Synchronization module 224 triggers PWM3 in the rising edge for detecting STV signals
The rising edge of signal is to export PWM2 signals, i.e. rising edge synch of the PWM2 signals every n rising edge and STV signals.Wherein,
The frequency of PWM2 signals is identical as the frequency of PWM3 signals.
In a preferred embodiment, the liquid crystal display control device further includes memory 250, for storing again
Frequency n, wherein n is positive integer.
Backlight drive circuit 240 is used to generate backlight drive letter according to the second pulse width modulating signal (PWM2 signals)
Number, and export to the backlight module 300.
Due to n times that PWM2 frequencies are STV signal frequencies, n is positive integer, is far above the frequency of eye recognition, human eye
The variation that will not feel backlight illumination, does not interfere with subjective effect.
In the present embodiment, since PWM2 signals are fixed with the sequential that image is shown, i.e. display panel epigraph is shown
After a certain period of time, backlight module 300 is opened after receiving PWM2 signals again, and the bright dark relationship of each frame image and backlight module
It is fixed, it is possible to which scan frequency and the water ripples caused by the interference of backlight PWM frequency for being inherently eliminated image are existing
As.
When signal connector is edp interfaces, after liquid crystal display is powered, PWM2 signals are at least delayed than vision signal
200ms, and the period of STV signals is far smaller than 100ms.Control provided in an embodiment of the present invention for liquid crystal display fills
It sets, the first pulse width modulating signal is converted into the second pulse width with field sync signal at frequency multiplication by sequence controller
Modulated signal is used in the frequency phase of the frequency and the pulse width modulating signal for adjusting backlight of the field sync signal of display
Difference is larger, and then the scan frequency for eliminating image and water ripple phenomenon caused by the interference of backlight PWM frequency.
As shown in figure 5, in step S01, signal connector receives the external vision signal provided and the first pulse is wide
Spend modulated signal.
In step S02, sequence controller generates gate drive signal and source drive signal according to vision signal,
In, the gate drive signal includes field sync signal.
In step S03, display driver circuit is according to the gate drive signal and the driving display of source drive signal
The corresponding image of vision signal described in Display panel.
In step S04, sequence controller turns first pulse width modulating signal according to the field sync signal
Change the second pulse width modulating signal at frequency multiplication with the field sync signal into.
In the present embodiment, the frequency of the second pulse width modulating signal is the integral multiple of field sync signal frequency.
Specifically, as shown in fig. 6, step S04 includes the following steps.
In step S041, the frequency of field sync signal is obtained.
In step S042, according to the frequency of the field sync signal and the frequency multiplication to prestore by first pulse width
Signal is converted into third pulse width modulating signal.
In step S043, the third pulse width modulating signal and the field sync signal are synchronized to export
Second pulse width modulating signal.
In step S05, backlight drive circuit generates backlight drive signal according to the second pulse width modulating signal, and defeated
Go out to the backlight module.
Control method provided in an embodiment of the present invention for liquid crystal display, it is by sequence controller that the first pulse is wide
Degree modulated signal is converted into the second pulse width modulating signal with field sync signal at frequency multiplication, is used in the field synchronization letter of display
Number frequency and frequency phase-difference for the pulse width modulating signal that adjusts backlight it is larger, and then eliminate under narrow viewing angle pattern with
The identical exchange public voltage signal of phase of field sync signal and water ripples caused by the phase interference of backlight pwm signal are existing
As.
As described above according to the embodiment of the present invention, there is no all details of detailed descriptionthe for these embodiments, also not
Limit the specific embodiment that the invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can utilize modification of the invention and on the basis of the present invention to use well.The protection model of the present invention
The range that the claims in the present invention are defined should be subject to by enclosing.
Claims (10)
1. a kind of control device for liquid crystal display, the liquid crystal display includes display panel and backlight module, spy
Sign is, including：
Signal connector, for receiving vision signal and the first pulse width modulating signal；
Sequence controller, for generating gate drive signal and source drive signal according to the vision signal, wherein described
Gate drive signal includes field sync signal；
Display driver circuit, described in being shown according to the gate drive signal and source drive signal driving display panel
The corresponding image of vision signal；
Wherein, the sequence controller is additionally operable to be converted first pulse width modulating signal according to the field sync signal
At the second pulse width modulating signal with the field sync signal at frequency multiplication；
Backlight drive circuit for generating backlight drive signal according to the second pulse width modulating signal, and is exported to the back of the body
Optical mode group.
2. the control device according to claim 1 for liquid crystal display, which is characterized in that second pulse width
The frequency of modulated signal is the integral multiple of field sync signal frequency.
3. the control device according to claim 2 for liquid crystal display, which is characterized in that the sequence controller packet
It includes：
Signal conversion module, for generating gate drive signal and source drive signal according to the vision signal；Wherein, institute
It includes field sync signal to state gate drive signal；
Frequency acquisition module, the frequency for obtaining field sync signal；
Pulse width modulation module, for according to the frequency of the field sync signal and the frequency multiplication to prestore by first pulse
Width signal is converted into third pulse width modulating signal；
Synchronization module, for synchronizing the third pulse width modulating signal and the field sync signal to export second
Pulse width modulating signal.
4. the control device according to claim 3 for liquid crystal display, which is characterized in that the sequence controller is also
Including memory, for storing frequency multiplication, the frequency multiplication is positive integer.
5. the control device according to claim 4 for liquid crystal display, which is characterized in that the display driver circuit
Including：
Gate driving circuit, the grid for driving the display panel according to gate drive signal；
Source electrode drive circuit, for exporting corresponding gray scale voltage to the display panel according to source drive signal.
6. the control device according to claim 4 for liquid crystal display, which is characterized in that second pulse width
Modulated signal is at least delayed 200ms than the vision signal.
7. the control device according to claim 1 for liquid crystal display, which is characterized in that the field sync signal
Period is less than 100ms.
8. a kind of control method for liquid crystal display, which is characterized in that including：
Signal connector receives the external vision signal provided and the first pulse width modulating signal；
Sequence controller generates gate drive signal and source drive signal according to vision signal, wherein the gate driving
Signal includes field sync signal；
Display driver circuit shows the video according to the gate drive signal and source drive signal driving display panel
The corresponding image of signal；
First pulse width modulating signal is converted into and the field synchronization by sequence controller according to the field sync signal
Signal at frequency multiplication the second pulse width modulating signal；
Backlight drive circuit generates backlight drive signal according to the second pulse width modulating signal, and exports to the backlight mould
Group.
9. the control method according to claim 8 for liquid crystal display, which is characterized in that the second pulse width is modulated
The frequency of signal is the integral multiple of field sync signal frequency.
10. the control method according to claim 9 for liquid crystal display, which is characterized in that sequence controller according to
First pulse width modulating signal is converted into the second arteries and veins with the field sync signal at frequency multiplication by the field sync signal
Rushing bandwidth modulation signals includes：
Obtain the frequency of field sync signal；
First pulse width signal is converted into third arteries and veins according to the frequency of the field sync signal and the frequency multiplication to prestore
Rush bandwidth modulation signals；
The third pulse width modulating signal and the field sync signal are synchronized to export the modulation of the second pulse width
Signal.
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| CN201810250519.3A CN108597464B (en) | 2018-03-26 | 2018-03-26 | Control device and control method for liquid crystal display |
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| CN201810250519.3A CN108597464B (en) | 2018-03-26 | 2018-03-26 | Control device and control method for liquid crystal display |
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Family
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110223621A (en) * | 2019-06-10 | 2019-09-10 | 惠科股份有限公司 | Signal modulation method and device and display device |
| CN111145697A (en) * | 2018-11-02 | 2020-05-12 | 茂达电子股份有限公司 | Backlight device and dimming control method thereof |
| CN112581916A (en) * | 2020-12-14 | 2021-03-30 | 京东方科技集团股份有限公司 | Dimming circuit of backlight module, dimming method of dimming circuit and display device |
| CN112927648A (en) * | 2019-12-06 | 2021-06-08 | 西安诺瓦星云科技股份有限公司 | Display control method and device, module control card and LED display screen |
| CN112992028A (en) * | 2021-03-05 | 2021-06-18 | 海信视像科技股份有限公司 | Display equipment and control method for eliminating screen display water ripples |
| CN113990271A (en) * | 2021-11-08 | 2022-01-28 | 上海中航光电子有限公司 | Display device driving method and display device |
| CN114242005A (en) * | 2021-12-28 | 2022-03-25 | 展讯通信（上海）有限公司 | Display method, electronic equipment and storage medium |
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