WO2017206274A1 - 消除lvds展频引起水波纹的方法 - Google Patents

消除lvds展频引起水波纹的方法 Download PDF

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WO2017206274A1
WO2017206274A1 PCT/CN2016/089794 CN2016089794W WO2017206274A1 WO 2017206274 A1 WO2017206274 A1 WO 2017206274A1 CN 2016089794 W CN2016089794 W CN 2016089794W WO 2017206274 A1 WO2017206274 A1 WO 2017206274A1
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Prior art keywords
lvds
signal
mod
frame
spread
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French (fr)
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常鹏刚
王念茂
郭东胜
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/14—Use of low voltage differential signaling [LVDS] for display data communication

Definitions

  • the invention belongs to the technical field of liquid crystal displays, and more particularly to a method for eliminating water ripple of a liquid crystal panel caused by LVDS (low voltage differential signal) spread spectrum.
  • LVDS low voltage differential signal
  • LCDs Liquid crystal displays
  • PDAs personal digital assistants
  • LCD TVs LCD TVs
  • EMI electromagnetic interference
  • SSC spread spectrum
  • an exemplary embodiment of the present invention provides a method of eliminating LVDS spread frequency causing water ripple of a liquid crystal panel.
  • the step of spread spectrum modulation is performed by a timing controller.
  • the frame picture is displayed through the liquid crystal panel.
  • the method for eliminating water ripple caused by LVDS spread spectrum provided according to an exemplary embodiment of the present invention can solve the problem of liquid crystal panel water ripple caused by LVDS spread spectrum.
  • FIG. 1 is a simplified block diagram showing a liquid crystal television according to an exemplary embodiment of the present invention
  • FIG. 2 is a diagram showing an LVDS SCC (Low Voltage Differential Signal Spread Spectrum) modulation waveform diagram according to an exemplary embodiment of the present invention
  • FIG. 3 is a flowchart illustrating a method of solving LVDS SCC induced water ripple according to an exemplary embodiment of the present invention
  • 4A and 4B are diagrams showing LVDS SCC modulation waveforms according to another exemplary embodiment of the present invention.
  • FIG. 1 is a simplified block diagram showing a liquid crystal television according to an exemplary embodiment of the present invention.
  • the liquid crystal television may include a liquid crystal panel and a driving system of the liquid crystal panel.
  • the drive system of the liquid crystal panel may include a TV movement (SOC) and a TCON (Timing Controller).
  • the TV movement can output LVDS (low voltage differential signal) or LVDS SSC (spread spectrum) signals, and can set the F MOD (spread frequency modulation frequency) parameter of the LVDS SSC signal, wherein the LVDS SSC signal is spread spectrum for the LVDS signal.
  • the resulting signal, F MOD represents the frequency at which TCON spreads the LVDS signal.
  • TCON can generate gating signals and control the LCD panel display frame.
  • FIG. 2 is a diagram showing an LVDS SCC (Low Voltage Differential Signal Spread Spectrum) modulation waveform diagram according to an exemplary embodiment of the present invention.
  • LVDS SCC Low Voltage Differential Signal Spread Spectrum
  • f 0 is the frequency at which the LVDS signal is not spread-spectrum modulated, that is, the reference frequency.
  • the sum of the integrated area of the positive offset with respect to the reference frequency and the integral area of the negative offset with respect to the reference frequency is not At the same time, it will cause the gating signal generated by TCON to shake, which causes the liquid crystal panel to generate water ripple.
  • FIG. 3 is a flow chart illustrating a method of eliminating LVDS spread frequency causing water ripples, according to an exemplary embodiment of the present invention.
  • the LVDS signal is spread-spectrum modulated by F MOD through TCON to generate and transmit an LVDS SSC signal.
  • 4A and 4B are diagrams showing LVDS SCC modulation waveforms according to an exemplary embodiment of the present invention.
  • t 2 ⁇ (1/F MOD ) is satisfied during the period t of displaying each frame picture.
  • a method of eliminating water ripple caused by LVDS spread spectrum according to an exemplary embodiment of the present invention, in an LVDS SSC modulation waveform diagram, an integrated area of a positive offset with respect to a reference frequency during a period in which each frame picture is displayed And the sum of the integrated areas that can be negatively offset with respect to the reference frequency, thereby preventing the liquid crystal panel from generating water ripples.
  • the above method according to the present invention can be implemented as computer code in a computer readable recording medium.
  • the computer code can be implemented by those skilled in the art in accordance with the description of the above method.
  • the above method of the present invention is implemented when the computer code is executed in a computer.
  • each unit in the driving device of the liquid crystal panel may be implemented as a hardware component.
  • Those skilled in the art can implement the various units using, for example, a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the various defined units.
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Integrated Circuit

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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)

Abstract

一种消除LVDS展频引起水波纹的方法，包括，获得帧率R(301)；根据获得的帧率计算显示一帧画面的时间t(302)；根据显示一帧画面的时间t，将F MDO设置为使得t＝k×(1/F MOD)，其中，F MOD表示对LVDS信号进行展频调制的频率，k为正整数(303)；以F MOD对LVDS信号进行展频调制，从而产生并发送LVDS展频信号(304)。

Description

消除LVDS展频引起水波纹的方法 技术领域
本发明属于液晶显示器技术领域，更具体地说，涉及一种消除LVDS(低电压差分信号)展频引起的液晶面板水波纹的方法。
背景技术
液晶显示器(LCD)是目前使用最广泛的一种平板显示器，已经逐渐成为各种电子设备(如移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或液晶电视)所采用的显示器。
日益增多的电子设备造成了电磁干扰(EMI)。这种电磁干扰会对其它电子设备或人体产生影响。目前对电子设备都有很严格的EMI量化规定。现今减少EMI的基本方法是对时钟或信号进行展频(SSC)调制。例如，针对LVDS(低电压差分信号)信号发送系统，对LVDS信号进行展频调制。
然而，对LVDS信号进行展频调制会引起液晶显示面板的水波纹问题。
发明内容
为克服现有技术的不足，本发明的示例性实施例提供一种消除LVDS展频引起液晶面板水波纹的方法。
根据本发明的示例性实施例一方面提供一种消除LVDS展频引起水波纹的方法，其特征在于，获得帧率R；根据获得的帧率计算显示一帧画面的时间t；根据显示一帧画面的时间t，将FMOD设置为使得t＝k×(1/FMOD)，其中，FMOD表示对LVDS信号进行展频调制的频率，k为正整数；以FMOD对LVDS信号进行展频调制，从而产生并发送LVDS展频信号。
可选地，，显示一帧画面的时间t＝1/R。
可选地，通过时序控制器执行展频调制的步骤。
可选地，通过液晶面板显示帧画面。
根据本发明的示例性实施例提供的消除LVDS展频引起水波纹的方法，能够解决LVDS展频引起的液晶面板水波纹的问题。
将在接下来的描述中部分阐述本发明另外的方面和/或优点，还有一部分通过描述将是清楚的，或者可以经过本发明的实施而得知。
附图说明
通过下面结合附图进行的对实施例的描述，本发明的上述和/或其它目的和优点将会变得更加清楚，其中：
图1是示出根据本发明示例性实施例的液晶电视的简化框图；
图2是示出根据本发明示例性实施例的LVDS SCC(低电压差分信号展频)调制波形图；
图3是示出根据本发明示例性实施例的解决LVDS SCC引起水波纹的方法的流程图；
图4A和图4B是示出根据本发明另一示例性实施例的LVDS SCC调制波形图。
具体实施方式
现将详细描述本发明的示例性实施例，所述实施例的示例在附图中示出，其中，相同的标号指示相同的部分。以下将通过参照附图来说明所述实施例，以便解释本发明。
图1是示出根据本发明示例性实施例的液晶电视的简化框图。
如图1所示，液晶电视可包括液晶面板以及液晶面板的驱动系统。液晶面板的驱动系统可包括TV机芯(SOC)和TCON(时序控制器)。TV机芯可输出LVDS(低电压差分信号)或LVDS SSC(展频)信号，并可设置LVDS SSC信号的FMOD(展频调制频率)参数，其中，LVDS SSC信号是对LVDS信号进行展频后产生的信号，FMOD表示TCON对LVDS信号进行展频调制的频率。TCON可产生门控信号并可控制液晶面板显示画面帧。
图2是示出根据本发明示例性实施例的LVDS SCC(低电压差分信号展频)调制波形图。
在图2中，f0为LVDS信号未进行展频调制时的频率，即基准频率。
在LVDS SSC调制波形图中，在显示每一帧画面的时间段期间，当相对于基准频率的正偏移量的积分面积之和与相对于基准频率的负偏移量的积分面积之和不同时，会引起TCON产生的门控信号发生抖动，从而导致液晶面板产生水波纹现象。
图3是示出根据本发明示例性实施例的消除LVDS展频引起水波纹的方法的流程图。
如图3所示，在步骤301，TV机芯获得液晶电视的帧率R，例如，R＝60HZ。
在步骤302，TV机芯计算显示一帧画面的时间t，即，t＝1/R。例如，当R＝60HZ时，t＝16.67ms。
在步骤303，根据显示一帧画面的时间t，TV机芯将FMOD设置为使得t＝k×(1/FMOD)，其中，k为整数。例如，当t＝16.67ms，k＝1时，将FMOD设置为1/16.67ms。
在步骤304，通过TCON以FMOD对LVDS信号进行展频调制，从而产生并发送LVDS SSC信号。
图4A和图4B是示出根据本发明示例性实施例的LVDS SCC调制波形图。
如图4A和图4B所示，在LVDS SSC调制波形图中，在显示每一帧画面 的时间段t期间，满足t＝2×(1/FMOD)。
根据本发明示例性实施例的消除LVDS展频引起水波纹的方法，在LVDS SSC调制波形图中，在显示每一帧画面的时间段期间，相对于基准频率的正偏移量的积分面积之和可与相对于基准频率的负偏移量的积分面积之和相同，从而防止液晶面板产生水波纹。
此外，根据本发明的上述方法可以被实现为计算机可读记录介质中的计算机代码。本领域技术人员可以根据对上述方法的描述来实现所述计算机代码。当所述计算机代码在计算机中被执行时实现本发明的上述方法。
此外，根据本发明的示例性实施例的液晶面板的驱动装置中的各个单元可被实现为硬件组件。本领域技术人员根据限定的各个单元所执行的处理，可以使用例如现场可编程门阵列(FPGA)或专用集成电路(ASIC)来实现各个单元。
本发明的以上实施例仅仅是示例性的，而本发明并不受限于此。本领域技术人员应该理解：在不脱离本发明的原理和精神的情况下，可对这些实施例进行改变，其中，本发明的范围在权利要求及其等同物中限定。

Claims (7)

  1. 一种消除LVDS展频引起水波纹的方法，其中，所述方法包括：
    获得帧率R；
    根据获得的帧率计算显示一帧画面的时间t；
    根据显示一帧画面的时间t，将
    Figure PCTCN2016089794-appb-100001
    设置为使得t＝k×(1/FMOD)，其中，FMOD表示对LVDS信号进行展频调制的频率，k为正整数；
    以FMOD对LVDS信号进行展频调制，从而产生并发送LVDS展频信号。
  2. 根据权利要求1所述的方法，其中，显示一帧画面的时间t＝1/R。
  3. 根据权利要求2所述的方法，其中，通过时序控制器执行展频调制的步骤。
  4. 根据权利要求1所述的方法，其中，通过液晶面板显示帧画面。
  5. 一种液晶面板的驱动系统，包括：时序控制器，产生门控信号并控制液晶面板显示画面帧；以及TV机芯，输出LVDS或LVDS展频信号，并设置LVDS展频信号的FMOD参数，其中，LVDS展频信号是对LVDS信号进行展频后产生的信号，FMOD表示时序控制器对LVDS信号进行展频调制的频率，其中，
    TV机芯根据显示一帧画面的时间t，将FMOD设置为使得t＝k×(1/FMOD)，其中，k为正整数。
  6. 根据权利要求5所述的驱动系统，其中，显示一帧画面的时间t＝1/R，其中，R为帧率。
  7. 根据权利要求5所述的驱动系统，其中，通过液晶面板显示帧画面。
PCT/CN2016/089794 2016-05-30 2016-07-12 消除lvds展频引起水波纹的方法 Ceased WO2017206274A1 (zh)

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CN111243544B (zh) * 2020-03-11 2021-07-23 深圳市华星光电半导体显示技术有限公司 消除展频引起水波纹的方法、存储介质及显示面板
CN111710313B (zh) * 2020-07-14 2022-06-03 京东方科技集团股份有限公司 显示面板水波纹的消除方法及消除装置、显示装置
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CN117475952B (zh) * 2023-09-06 2026-02-24 Tcl华星光电技术有限公司 消除水波纹的展频方法、显示面板及存储介质

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