WO2014075339A1 - 液晶显示时序驱动器 - Google Patents
液晶显示时序驱动器 Download PDFInfo
- Publication number
- WO2014075339A1 WO2014075339A1 PCT/CN2012/085227 CN2012085227W WO2014075339A1 WO 2014075339 A1 WO2014075339 A1 WO 2014075339A1 CN 2012085227 W CN2012085227 W CN 2012085227W WO 2014075339 A1 WO2014075339 A1 WO 2014075339A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- timing control
- control chip
- signal
- display
- slave
- 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.)
- Ceased
Links
Classifications
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
Definitions
- the present invention relates to the field of liquid crystal display driving, and more particularly to a timing driver for a large-sized liquid crystal display. Background technique
- the driving circuit of the liquid crystal display includes: a timing control circuit, a source driving circuit, a gate driving circuit, and a backlight driving circuit.
- Timing control is an important and essential part of liquid crystal display. It mainly includes timing control circuit.
- the main functions are to receive the main board circuit signal, output gate driver timing signal, source driver timing signal and data signal, field sync signal and other functions. signal.
- the timing signals corresponding to the gate drive include: a clock signal (CKV), a start pulse signal (STV, used as a field sync signal), an output enable signal (OE, a control gate switch); a timing signal corresponding to the source driver includes : Latch pulse signal (TP), polarity inversion signal (POL).
- the backlight driving circuit controls the backlight switching and brightness by using a timing control signal and a voltage current signal.
- the refresh rate of the LCD display is generally 60HZ, 120HZ, 240HZ or higher.
- the refresh rate is the number of frames displayed per second in the LCD screen.
- the refresh rate is the same as the STV signal.
- the quality of the screen display is related to the LCD screen itself.
- the backlight generally uses pulse width modulation (PWM) signal dimming control, wherein the duty cycle of the PWM signal affects the brightness of the backlight, and the PWM frequency affects the flicker of the picture.
- PWM pulse width modulation
- the tablet computer and the liquid crystal display are adjusted by independent backlight adjustment mode, and the timing control circuit of the liquid crystal display and the timing control circuit of the backlight are independent of each other, and the two gate drivers and the source are independently controlled by two chips.
- Polar drive timing an additional central control processing module (MCU) controls the backlight drive timing, so that the refresh rate of the LCD picture and the PWM frequency of the backlight control circuit and the phase consistency are not guaranteed, which may cause The picture flickers.
- the scanning frame frequency Fi of the liquid crystal display is synchronized with the flicker frequency F 2 of the backlight. When in phase, F ⁇ NF will appear to be a phenomenon of standing ripple (standing wave phenomenon), and at this time, a static horizontal stripe is expressed. .
- the timing control of the liquid crystal display and the control of the backlight use two timing control chips (TCON), respectively.
- TCON timing control chips
- Output timing control signals required for gate drive and source drive For the backlight timing drive, an additional central control processing module (MCU) is required, and a high-speed synchronous serial communication (SPI) method is used to implement timing driving to generate a PWM signal.
- MCU central control processing module
- SPI synchronous serial communication
- An object of the present invention is to provide a liquid crystal display timing driver, the controller comprising two timing control chips, wherein one timing control chip generates a source timing control signal and a gate timing control signal, and simultaneously controls the other by using a master-slave mode
- the timing control chip generates a pulse-width modulated signal driven by the backlight, which can save a control chip that needs to be added when the backlight is scanned in the prior art, thereby reducing the cost.
- the present invention provides a liquid crystal display timing driver, comprising: a main timing control chip, a slave timing control chip electrically connected to the main timing control chip and controlled by the main timing control chip, and a master and slave timing a display driving interface electrically connected to the control chip, a backlight driving interface electrically connected from the timing control chip, a first memory electrically connected to the main timing control chip, a second memory electrically connected to the timing control chip, and a data input interface electrically connected to the timing control chip, the display driving interface is configured to be electrically connected to the liquid crystal panel, the backlight driving interface is used for electrically connecting with the backlight driving circuit, and the master and slave timing control The chip receives a control signal from the data input interface, and outputs a display timing control signal and a display data signal to the liquid crystal panel from the display driving interface according to the control signal, and the slave timing control chip outputs a pulse width modulation signal to the backlight driver from the backlight driving interface. Circuit.
- the first memory is a FLASH memory, and the first memory is used to store data for controlling image display.
- the second memory is a FLASH memory, and the second memory is used to store data for controlling image display.
- the signal received by the master and slave timing control chips from the data input interface is a primary low voltage differential signal.
- the master timing control chip and the slave timing control chip use a synchronization signal as a reference, and the two synchronously receive the primary low voltage differential signal and synchronously transmit a display data signal and a display timing control signal to the display driving interface.
- the synchronization signal is a start pulse signal generated by the main timing control chip.
- the master timing control chip controls the slave timing control chip by using a high-speed synchronous serial communication master-slave control mode.
- the display timing control signal is a secondary low voltage differential signal.
- the display timing control signal includes: a clock signal, a start pulse signal, an output enable signal, a latch pulse signal, and a polarity inversion signal.
- the slave timing control chip outputs eight pulse width modulated signals from the backlight driving interface.
- the present invention also provides a liquid crystal display timing driver, comprising: a main timing control chip, a slave timing control chip electrically connected to the main timing control chip and controlled by the main timing control chip, and a master and slave timing control chip a connected display driving interface, a backlight driving interface electrically connected from the timing control chip, a first memory electrically connected to the main timing control chip, a second memory electrically connected to the timing control chip, and a master and slave timing a data input interface electrically connected to the control chip, the display driving interface is configured to be electrically connected to the liquid crystal panel, the backlight driving interface is used for electrically connecting with the backlight driving circuit, and the master and slave timing control chips are input from the data The interface receives the control signal, and outputs a display timing control signal and
- the first memory is a FLASH memory, and the first memory is used to store data for controlling image display;
- the second memory is a FLASH memory, and the second memory is used to store data for controlling image display;
- the signal received by the master and slave timing control chip from the data input interface is a primary low voltage differential signal
- the main timing control chip and the slave timing control chip are based on a synchronization signal, and the two synchronously receive the primary low voltage differential signal and synchronously send a display data signal and a display timing control signal to the display driving interface;
- the synchronization signal is a start pulse signal generated by the main timing control chip; wherein, the main timing control chip adopts a high-speed synchronous serial communication master-slave control mode for controlling the slave timing control chip;
- the display timing control signal is a secondary low voltage differential signal
- the display timing control signal includes: a clock signal, a start pulse signal, an output enable signal, a latch pulse signal, and a polarity inversion signal;
- the slave timing control chip outputs eight pulse width modulation signals from the backlight driving interface.
- the liquid crystal display timing driver of the present invention uses only two timing control chips to drive the liquid crystal panel and the backlight, wherein one timing control chip generates a source timing control signal and a gate timing control signal, and simultaneously utilizes the master-slave
- the method of controlling another timing control chip to generate a backlight-driven pulse width modulation signal can save a control chip that needs to be added when backlight scanning is performed in the prior art, thereby reducing cost and improving product market competitiveness.
- FIG. 1 is a schematic structural diagram of a conventional liquid crystal display driving and backlight driving timing controller
- FIG. 2 is a schematic structural view of a liquid crystal timing driver according to the present invention
- Fig. 3 is a waveform diagram of a pulse width modulation signal PWM generated from a timing control chip of the present invention. detailed description
- the present embodiment provides a liquid crystal display timing driver 1 , including: a main timing control chip 21 , and a slave timing control chip 22 electrically connected to the main timing control chip 21 and controlled by the main timing control chip 21 .
- a display driving interface 10 electrically connected to the master and the timing control chips 21 and 22, a backlight driving interface 40 electrically connected to the timing control chip 22, and a first memory 31 electrically connected to the main timing control chip 21,
- the display drive interface 10 is electrically connected to the liquid crystal panel 50, and is connected to the second memory 32 electrically connected from the timing control chip 22 and the data input interface 60 electrically connected to the master and slave timing control chips 21 and 22,
- the backlight driving interface 40 is configured to be electrically connected to the backlight driving circuit, and the master and slave timing control chips 21, 22 receive a control signal from the data input interface 60, and output display timing control from the display driving interface 10 according to the control signal.
- the driving circuit can further drive the liquid crystal panel 50 and the backlight 80 by using two timing control chips, thereby saving the control chip MCU which needs to be added when the backlight scanning is performed in the prior art, thereby reducing the production cost and improving the product market. Competing.
- the first memory 31 is a FLASH memory, the first memory 31 is used to store data for controlling image display; the second memory 32 is a FLASH memory, and the second memory 32 is used to store an image for controlling The displayed data, both of which are fast to store and have a long service life.
- the data for controlling image display mainly includes: main timing control chip 21 and slave time
- the communication control protocol further includes receiving, by the timing control chip 22, the signal on the data input interface 60 in synchronization with the main timing control chip 21, synchronously transmitting the display data signal, displaying the timing control signal 3, and the like.
- the operation control method mainly includes an operation and conversion rule on the received signal on the data input interface 60.
- the master timing control chip 21 and the slave timing control chip 22 synchronously receive the primary low voltage differential signal and synchronously send the display data signal to the display driving interface 10 and display the timing control signal S 3 based on a synchronization signal.
- the synchronization signal is a start pulse signal generated by the main timing control chip 21, and the start pulse signal is generated by the main timing control chip 21 and used to control the slave timing control chip 22.
- the master timing control chip 21 adopts a high-speed synchronous serial communication master-slave control mode for the control of the slave timing control chip 22.
- the high-speed synchronous serial communication can ensure the real-time performance of the main timing control chip 21 and the slave timing control chip 22, and the communication mode can implement the main timing control chip 21 and the slave timing control in combination with the start pulse signal.
- the signals received by the master and slave timing control chips 21, 22 from the data input interface 60 are primary low voltage differential signals S.
- the display timing control signal is a secondary low voltage differential signal S 2 .
- the display timing control signal S 3 includes: a clock signal, a start pulse signal, an output enable signal, a latch pulse signal, a polarity inversion signal, and the like.
- the slave timing control chip 22 outputs eight pulse width modulation signals PWM1-PWM8, and the eight pulse width modulation signals PWM1-PWM8 can be output to the backlight driving circuit through the backlight driving interface 40, thereby driving the backlight 80, which is
- the control chip MCU that needs to be added when the backlight scanning is performed in the prior art can be saved, and the production cost is reduced.
- the starting phases of the eight pulse width modulated signals PWM1-PWM8 outputted from the timing control chip 22 are preferably 45 degrees, that is, PWM1 (0.), PWM2 (45. ), PWM3 (90.), PWM4 (135 °), PWM5 (180 ° ;), PWM6 (225.), PWM7 (270°), PWM8 (315°).
- the eight pulse width modulated signals PWM1-PWM8 may be generated simultaneously from the timing control chip 22 or sequentially.
- the timing controller 1 is applied to a liquid crystal display having a resolution of 3840 2160.
- the basic working principle of the liquid crystal display timing driver 1 of the present invention is as follows:
- the main timing control chip 21 and the slave timing control chip 22 simultaneously receive the primary low voltage differential signal Si on the data input interface 60, and then the main timing control chip 21 and The master-slave communication control protocol and the arithmetic control method stored in the first and second memories 31, 32 are respectively called from the timing control chip 22.
- the main timing control chip 21 generates according to the operation control method: a start pulse signal, an output enable signal, a latch pulse signal, a polarity inversion signal, and the like display timing control signal S 3 according to the received primary low voltage differential signal Si generation: The secondary low voltage differential signal S 2 and the like display data signals.
- the master timing control chip 21 simultaneously transmits the start pulse signal and the master-slave control mode control information to the slave timing control chip 22, so that the slave timing control chip 22 follows the called master-slave communication control protocol and the The start pulse signal and the main timing control chip 21 operate in a synchronous mode, and the master-slave control mode control information is operated in the master-slave mode according to the master-slave control mode control information.
- the chip 22 from the timing control of the operation control method call and, at the same time the start pulse signal generated in accordance with a primary low voltage differential signal Si received signal to produce a secondary low-voltage differential signal S 2 and the like in accordance with the display data in accordance with a pulse width of 8 Modulation signal PWM1-PWM8.
- the master timing control chip 21 and the slave timing control chip 22 transmit the display timing signal and the display data signal to the display driving interface 10, and further to the liquid crystal panel 50; the slave timing control chip 22
- the pulse width modulated signals PWM1-PWM8 are passed to the backlight driving interface 40 and then to the backlight 80.
- the liquid crystal display timing driver of the present invention has a main timing control chip that operates in a high-speed serial communication master-slave mode and simultaneously receives display primary data, and a slave timing control chip, and a master timing control chip generates display timing. Controlling information, and generating display data information together with the slave timing control chip, and separately generating eight pulse width modulation signals for driving the backlight unit from the timing control chip, the pulse width modulation signals having phase differences with each other, and simultaneously generating It is also possible to generate timings by using the pulse width modulation signals to drive the backlight unit cyclically to overcome the standing wave phenomenon of the liquid crystal display.
- the invention can save the control chip which needs to be added when the backlight scanning is performed in the prior art, and the cost is reduced. Improve the competitiveness of the product market.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112012007132.8T DE112012007132T5 (de) | 2012-11-15 | 2012-11-25 | Takttreiber für Flüssigkristallanzeige |
| US13/806,774 US20140132493A1 (en) | 2012-11-15 | 2012-11-25 | Clock Driver of Liquid Crystal Display |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210460605.XA CN102930845B (zh) | 2012-11-15 | 2012-11-15 | 液晶显示时序驱动器 |
| CN201210460605.X | 2012-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014075339A1 true WO2014075339A1 (zh) | 2014-05-22 |
Family
ID=47645628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2012/085227 Ceased WO2014075339A1 (zh) | 2012-11-15 | 2012-11-25 | 液晶显示时序驱动器 |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102930845B (zh) |
| DE (1) | DE112012007132T5 (zh) |
| WO (1) | WO2014075339A1 (zh) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110428767A (zh) * | 2019-06-27 | 2019-11-08 | 重庆惠科金渝光电科技有限公司 | 显示面板的驱动电路及显示装置 |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105957479B (zh) * | 2016-05-31 | 2019-09-10 | 深圳市华星光电技术有限公司 | 接口装置及具有该接口装置的液晶显示器 |
| CN108109591A (zh) * | 2017-11-03 | 2018-06-01 | 硅谷数模半导体(北京)有限公司 | 显示屏的控制装置及笔记本面板 |
| CN107680554B (zh) * | 2017-11-22 | 2020-04-28 | 深圳市华星光电技术有限公司 | 显示装置驱动系统及方法 |
| CN108597464B (zh) * | 2018-03-26 | 2021-08-06 | 昆山龙腾光电股份有限公司 | 用于液晶显示器的控制装置及控制方法 |
| TWI701578B (zh) * | 2018-06-29 | 2020-08-11 | 瑞鼎科技股份有限公司 | 顯示裝置及其晶片間匯流排 |
| CN109599050B (zh) * | 2019-01-31 | 2022-04-05 | 合肥鑫晟光电科技有限公司 | 一种显示面板画质改善方法及其装置、显示装置 |
| CN110890076A (zh) * | 2019-11-25 | 2020-03-17 | Tcl华星光电技术有限公司 | 显示面板驱动系统 |
| CN111326125B (zh) | 2020-04-07 | 2021-06-01 | Tcl华星光电技术有限公司 | Tcon时序控制信号控制方法及驱动电路 |
| CN112820244A (zh) * | 2021-01-08 | 2021-05-18 | 掌阅科技股份有限公司 | 电子纸显示设备及电子纸显示设备的控制方法 |
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| JP4063800B2 (ja) * | 2004-08-02 | 2008-03-19 | 沖電気工業株式会社 | 表示パネル駆動装置 |
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| CN101556772B (zh) * | 2008-04-07 | 2011-12-14 | 北京京东方光电科技有限公司 | 液晶显示器驱动电路 |
| US8698728B2 (en) * | 2009-11-02 | 2014-04-15 | Atmel Corporation | Apparatus for integrated backlight and dynamic gamma/VCOM control on silicon chips |
| KR101329970B1 (ko) * | 2010-12-13 | 2013-11-13 | 엘지디스플레이 주식회사 | 액정표시장치 |
| CN102306484A (zh) * | 2011-08-31 | 2012-01-04 | 福州华映视讯有限公司 | 产生背光驱动电流的控制电路与其方法 |
| TWI457908B (zh) * | 2012-03-30 | 2014-10-21 | Au Optronics Corp | 一種減少液晶顯示器之殘影的方法與一種採用此方法的液晶顯示器 |
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2012
- 2012-11-15 CN CN201210460605.XA patent/CN102930845B/zh active Active
- 2012-11-25 WO PCT/CN2012/085227 patent/WO2014075339A1/zh not_active Ceased
- 2012-11-25 DE DE112012007132.8T patent/DE112012007132T5/de active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101488309A (zh) * | 2008-01-17 | 2009-07-22 | 奇美电子股份有限公司 | 平面显示装置的驱动电路板、驱动系统及驱动方法 |
| CN101630490A (zh) * | 2009-05-07 | 2010-01-20 | 福州华映视讯有限公司 | 色序式液晶显示设备及其影像显示方法 |
| KR20110120017A (ko) * | 2010-04-28 | 2011-11-03 | 삼성모바일디스플레이주식회사 | 액정 표시 장치와 이의 구동 장치 및 구동 방법 |
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| CN110428767A (zh) * | 2019-06-27 | 2019-11-08 | 重庆惠科金渝光电科技有限公司 | 显示面板的驱动电路及显示装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102930845B (zh) | 2015-06-03 |
| DE112012007132T5 (de) | 2015-07-23 |
| CN102930845A (zh) | 2013-02-13 |
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