CN105739738A - 触摸传感器集成型显示装置 - Google Patents

触摸传感器集成型显示装置 Download PDF

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CN105739738A
CN105739738A CN201510762759.8A CN201510762759A CN105739738A CN 105739738 A CN105739738 A CN 105739738A CN 201510762759 A CN201510762759 A CN 201510762759A CN 105739738 A CN105739738 A CN 105739738A
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touch
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郑龙彩
徐升杓
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LG Display Co Ltd
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Abstract

本公开涉及一种触摸传感器集成型显示装置，其包括：显示面板；低电压驱动模块、高电压驱动模块、第一开关、第二开关和开关控制部。低电压驱动模块接收用于在显示面板上显示的图像数据并且实现对图像数据的数字信号处理。高电压驱动模块生成与图像数据对应的数据电压并且将数据电压输出到数据线。第一开关连接供电电压源和低电压驱动模块，并且第二开关连接高电压源和高电压驱动模块。开关控制部控制第一开关和第二开关的操作。

Description

触摸传感器集成型显示装置
本申请要求在2014年12月31日提交的韩国专利申请No.10-2014-0195728的优先权，出于所有目的其整体内容通过引用合并于此。
技术领域
本文涉及一种触摸传感器集成型显示装置。
背景技术
用户接口(UI)使得人(用户)能够与各种类型的电气或电子装置交互，使得他们能够容易地按照他们想要的那样控制装置。用户接口的典型示例包括具有红外通信能力或射频(RF)通信能力的小键盘、键盘、鼠标、屏上显示(OSD)和遥控器。用户接口技术持续发展以提高用户灵敏度以及操作易用性。近来，用户接口演进为触摸UI、语音识别UI、3DUI等。为便携式信息装置采用触摸UI正在变得绝对必要，而且触摸UI正将其应用范围扩展到家用电器。电容触摸屏可以用在多种应用中，因为它们较之传统的电阻触摸屏具有更高的耐用性和更好的对比度并且允许多点触摸感测和接近触摸感测。
近年来，对并入构成触摸屏的元件以使得诸如智能电话、平板PC等的便携式终端更纤薄的单元内(in-cell)类型(以下称为单元内)的触摸屏集成型显示装置的需求已增长。在单元内触摸屏集成型显示装置中，用于显示的公共电极被分成用于多个触摸驱动时段的电极和用于多个触摸感测时段的电极，使得在触摸驱动时段和触摸感测时段之间出现互电容。因此，单元内触摸屏集成型显示装置可以通过测量通过触摸造成的互电容的改变来检测触摸。
在触摸感测时段中，除了传感器电极之外的其他电极或信号线的电位必须不变。因此，在触摸感测时段期间，数据线保持在特定的电压值或者它们通向通道的电流路径被阻塞。当通道和数据线之间的电流路径被阻塞时，以及当特定电压被施加到数据线时，数据驱动器保持操作。就是说，在数据驱动器实际上没有操作时仍恒常地消耗电力，这导致不必要的电力浪费。
发明内容
根据本发明的触摸传感器集成型显示装置包括：显示面板；低电压驱动模块、高电压驱动模块、第一开关、第二开关和开关控制部。低电压驱动模块接收用于在显示面板上显示的图像数据并且实现对图像数据的数字信号处理。高电压驱动模块生成与图像数据对应的数据电压并且将数据电压输出到数据线。第一开关连接供电电压源和低电压驱动模块，并且第二开关连接高电压源和高电压驱动模块。开关控制部控制第一开关和第二开关的操作。
附图说明
所包括的附图用于提供对本发明的进一步理解，并且并入在本说明书中并形成本说明书的一部分。附图图示了本发明的实施例并且连同描述一起用于说明本发明的原理。在附图中：
图1是示出根据本发明的示例性实施例的触摸传感器集成型显示装置的视图；
图2是液晶单元的等效电路图；
图3是触摸屏的等效电路图；
图4是示出单元内型触摸屏的驱动电极阵列结构的视图；
图5和图6是示出根据本发明的示例性实施例的源极驱动IC的视图；
图7是示出根据本发明的示例性实施例的源极驱动IC的控制方法的视图；以及
图8是示出时钟恢复序列的示例的视图。
具体实施方式
在下文中，将参照附图详细描述本发明的示例性实施例。
图1是示出根据本发明的示例性实施例的触摸传感器集成型显示装置的视图。图2是图1的显示面板的像素的等效电路图。图3是触摸屏的等效电路图。
根据本发明的示例性实施例的显示装置包括显示面板DIS、显示驱动电路、触摸屏TSP、触摸屏驱动电路等。
参照图1和2，显示面板DIS包括在两个基板之间形成的液晶层。在显示面板DIS的下基板上形成多个数据线D1至Dm(m是自然数)、与数据线D1至Dm交叉的多个栅极线G1至Gn(n是自然数)、在数据线D1至Dm和栅极线G1至Gn的交叉处形成的多个薄膜晶体管(TFT)、用于使用数据电压对液晶单元充电的多个电极1、以及连接到像素电极1以保持液晶单元的电压的存储电容器Cst。
显示面板DIS上的像素阵列包括在由数据线D1至Dm和栅极线G1至Gn限定的像素区域中形成的像素。每个像素可以包括如图2中所示的液晶单元。每个像素的液晶单元由施加到像素电极1的数据电压和施加到公共电极2的公共电压Vcom之间的电压差所施加的电场来驱动以调整入射光的透射量。通过来自栅极线G1至Gn的栅极脉冲来接通TFT以将来自数据线D1至Dm的数据电压提供给液晶单元的像素电极1。
在显示面板DIS的上基板上，可以形成黑色矩阵、彩色滤光器等。显示面板DIS的上基板可以被实现为COT(TFT上的彩色滤光器)结构。在该情况下，黑色矩阵和彩色滤光器可以形成在显示面板DIS的下基板上。公共电极2可以形成在显示面板DIS的上基板或下基板上。
偏光器分别附接到显示面板DIS的上基板和下基板，并且用于设定液晶的预倾角的配向膜形成在接触液晶的内表面上。在显示面板DIS的上基板和下基板之间形成用于维持液晶单元的单元间隙的列间隔物。
背光单元可以设置在显示面板DIS的背面下面。背光单元是照明显示面板DIS的边缘型或直接型背光单元。显示面板DIS可以按任何公知的液晶模式实现，诸如TN(扭曲向列)模式、VA(竖直对准)模式、IPS(平面转换)模式和FFS(边缘场切换)模式。
显示驱动电路包括数据驱动电路12、扫描驱动电路14和显示定时控制器20，并且将关于输入图像的视频数据电压写入到显示面板DIS上的像素。数据驱动电路12将从显示定时控制器20输入的数字视频数据RGB转换成模拟正/负伽马补偿电压以输出数据电压。从数据驱动电路12输出的数据电压被提供给数据线D1至Dm。扫描驱动电路14依次提供与数据电压同步的栅极脉冲(或扫描脉冲)以选择被写入数据电压的显示面板DIS上的线。响应于扫描脉冲，在水平同步信号Hsync的逻辑高时段期间使用从数据驱动电路12输入的数据电压对显示面板DIS上的像素充电，并且在水平同步信号Hsync的逻辑低时段期间保持数据电压。
显示定时控制器20从主机***40接收定时信号，诸如竖直同步信号Vsync、水平同步信号Hsync、数据使能信号DE和主时钟MCLK，以使数据驱动电路12和扫描驱动电路14的操作定时彼此同步。竖直同步信号Vsync是用于限定1个帧时段的信号。水平同步信号Hsync限定将数据写入显示面板DIS的像素阵列中的一条线的像素所需的1个水平时段。通过将1个帧时段除以显示面板DIS上的线数目可以计算1个水平时段。水平同步信号Hsync的一个周期被设定为1个水平时段。数据使能信号DE限定有效数据输入时段，并且数据使能信号DE的一个周期被设定为1个水平时段，如水平同步信号Hsync。数据使能信号DE的脉冲与数据的一条线同步地生成，但是并非在竖直空白VB期间生成，而是仅在输入有效数据时生成。竖直空白VB是第I个帧时段(I是正整数)和第(I+1)个帧时段之间的时间，其间没有数据输入。主时钟信号MCLK与数字视频数据的每个位同步。
显示定时控制器20生成用于控制扫描驱动电路14的操作定时的扫描定时控制信号和用于控制数据驱动电路12的操作定时的数据定时控制信号。扫描定时控制信号包括栅极起动脉冲GSP、栅极移位时钟GSC、栅极输出使能信号GOE等。数据定时控制信号包括源极采样时钟SSC、极性控制信号POL、源极输出使能信号SOE等。
如图3中所示，触摸屏TSP包括Tx线T1至TN(N是小于n的正整数)、与Tx线T1至TN交叉的Rx线R1至RM(M是小于m的正整数)、以及在Tx线T1至TN和Rx线R1至RM的交叉处形成的(M×N)个触摸传感器Cts。每个触摸传感器Cts包括互电容。
图4是单元内型触摸屏TSP上的Tx电极和Rx电极的放大的俯视图。将参照图4更详细地描述单元内型触摸屏TSP。
每条Tx线包括在显示面板DIS的横向方向(图1的x轴)上经由链路图案L11至L22连接的透明Tx通道电极T11至T13和T21至T23。第一Tx线T1包括在横向方向上经由链路图案L11和L12连接的透明Tx通道电极T11至T13。第二Tx线T2包括在横向方向上经由链路图案L21和L22连接的透明Tx通道电极T21至T23。透明Tx通道电极T11至T23中的每个在尺寸上大于像素，并且与多个像素重叠。透明Tx通道电极T11至T23中的每个与像素电极1重叠，在它们之间存在绝缘层。透明Tx通道电极T11至T23中的每个可以由诸如氧化铟锡(ITO)的透明传导材料形成。链路图案L11至L22行进跨越Rx线R1和R2，并且电连接在横向方向(或水平方向)上相邻的透明Tx通道电极T11至T23。链路图案L11至L22可以与Rx线R1和R2重叠，在它们之间存在绝缘层。链路图案L11至L22可以由具有高电导率的金属或者透明传导材料形成，高电导率的金属例如铝(Al)金属、钼(Mo)、铬(Cr)、铜(Cu)或银(Ag)。
Rx线R1和R2在显示面板DIS的纵向方向(图1的y轴)上形成以成直角跨越Tx线。Rx线R1和R2可以由诸如ITO的透明传导材料形成。每个Rx线R1和R2可以与多个像素(未示出)重叠。
触摸屏驱动电路30在水平同步信号Hsync的每个逻辑低时段中将Tx驱动信号施加到Tx线T1至TN并且通过Rx线R1至RM感测触摸传感器Cts的电压。如图7中所示，水平同步信号Hsync的逻辑低时段包括竖直空白VB和水平空白HB。如上文所述，竖直空白VB是相邻的帧时段之间的时间，其间没有数据输入。水平空白HB是显示面板DIS的像素阵列上的相邻的线之间的时间，其间没有数据写入像素。水平空白HB等于连续的栅极脉冲之间的时间。
触摸屏驱动电路30包括Tx驱动电路32、Rx驱动电路34和触摸屏控制器36(以下称为“TSP控制器”)。
Tx驱动电路32响应于从TSP控制器36输入的Tx设置信号，选择籍其输出Tx驱动信号的Tx通道，并且将Tx驱动信号施加到与所选择的Tx通道连接的Tx线T1至TN。Tx线T1至TN在Tx驱动信号的高电压时段期间被充电以将电荷提供给触摸传感器Cts，并且在Tx驱动信号的低电压时段期间放电。Tx驱动信号可以通过Rx线R1至RM被连续地N次(N是等于或大于2的正整数)提供给Tx线T1至TN，使得触摸传感器Cts的电压值在Rx驱动电路34中的积分器中累积。
Rx驱动电路34响应于从TSP控制器36输入的Rx设置信号，选择籍其接收触摸传感器Cts的电压的Rx通道。Rx驱动电路34对通过Rx线R1至RM接收到的触摸传感器Cts的电压进行采样，并且在积分器中累积其值。随后，Rx驱动电路34使用连接到积分器的输出的模数转换器(以下称为“ADC”)将积分器中累积的电压值转换成数字数据，并且输出触摸原始数据。
TSP控制器36生成Tx设置信号和Rx设置信号，其中Tx设置信号用于设定Tx驱动电路32籍其输出Tx驱动信号的Tx通道，并且Rx设置信号用于设定Rx驱动电路34籍其接收触摸传感器Cts的电压的Rx通道，并且TSP控制器36使Tx驱动电路32的感测操作和Rx驱动电路34的感测操作彼此同步。再者，TSP控制器36生成用于控制Rx驱动电路34的采样器和积分器的操作定时以及ADC的操作定时的定时控制信号。
TSP控制器36从主机***40接收水平同步信号Hsync，并且在水平同步信号Hsync按时间划分成的触摸感测时段Ts期间驱动Tx驱动电路32和Rx驱动电路34。Tx驱动电路32和Rx驱动电路34在TSP控制器36的控制下，在水平同步信号Hsync的逻辑低时段内分配的触摸感测时段Ts期间感测触摸传感器的电压。
TSP控制器36执行预定的触摸检测算法以将从Rx驱动电路34接收到的触摸原始数据与预定的阈值进行比较。如果触摸原始数据在阈值以上，则触摸检测算法判断触摸原始数据是在触摸(或接近)位置处从触摸传感器输入的数据，并且计算每个触摸(或接近)位置的坐标。随后，TSP控制器36以高于显示帧速率的触摸报告速率将触摸报告数据TR传送到主机***40。在触摸检测处理器检测到触摸屏内的每个触摸传感器上的触摸的存在或不存在之后，创建触摸报告数据，并且该触摸报告数据包括每个触摸(或接近)位置的坐标信息。
主机***40可以被实现为如下之一：导航***、机顶盒、DVD播放器、蓝光播放器、个人计算机(PC)、家庭影院***、广播接收器和电话***。
图5和图6是示出源极驱动ICSD-IC的配置的视图。
参照图5和图6，根据本发明的源极驱动ICSD-IC包括低电压驱动模块LV_B、高电压驱动模块HV_B、第一开关LV_SW、第二开关HV_SW和开关控制部100。
低电压驱动模块LV_B通过使用供电电压VCC实现数字信号处理。供电电压VCC是用于操作逻辑电路的约3.3V的电压。低电压驱动模块LV_B包括数据时钟恢复(CDR)电路CDR、移位寄存器S/R和锁存器Latch。移位寄存器S/R使用从定时控制器20接收到的数据控制信号SSC和SSP对输入图像的RGB数字视频数据位采样，并且将采样位提供给锁存器Latch。锁存器Latch根据从移位寄存器S/R依次接收到的时钟来输出样本并且锁存数字视频数据位，并且响应于源极输出使能信号SOE与其他源极驱动IC的锁存器Latch同步地同时输出锁存的数据。
高电压驱动模块HV_B通过使用高电压VDD输出模拟电压。高电压驱动模块HV_B包括数模转换器DAC和输出部Amp_CH。数模转换器DAC将从锁存器Latch输入的视频数据转换成伽马补偿电压Gamma_B(伽马_B)以生成模拟视频数据电压。输出部Amp_CH在源极输出使能信号SOE的逻辑低时段期间向数据线提供从数模转换器DAC输出的模拟数据电压ADATA。输出部Amp_CH可以被实现为用于使用低电压GND和高电压VDD输出数据电压的输出缓冲器。
第二开关HV_SW有选择地开关高电压驱动模块HV_B的高电压输入I_VDD和高电压源S_VDD之间的电流路径。第一开关LV_SW的栅电极连接到开关控制部100，其第一电极连接到高电压源S_VDD，并且其第二电极连接到高电压驱动模块HV_B的高电压输入I_VDD。
第一开关LV_SW有选择地开关低电压驱动模块LV_B的供电电压输入I_VCC和供电电压源S_VCC之间的电流路径。第二开关HV_SW的栅电极连接到开关控制部100，其第一电极连接到供电电压源S_VCC，并且其第二电极连接到低电压驱动模块LV_B的供电电压输入I_VCC。
开关控制部100接收断开(OFF)信号SD_OFF和触摸同步信号TSYNC以控制第一开关LV_SW和第二开关HV_SW。
开关控制部100在下表1中所示的条件下控制第一开关LV_SW和第二开关HV_SW。
[表1]
图7是示出基于表1的源极驱动ICSD-IC的操作的时序图。参照图1和图7，下文将讨论基于断开信号SD_OFF和触摸同步信号TSYNC的源极驱动ICSD-IC的操作。
定时控制器20向源极驱动ICSD-IC输出相位与接通(ON)信号LCD_ON的相位相反的断开信号SD_OFF。就是说，定时控制器20在活跃模式期间向源极驱动ICSD-IC输出断开信号SD_OFF。再者，在活跃模式期间，定时控制器20向源极驱动ICSD-IC输出触摸同步信号TSYNC，用于区分图像显示时段Display和触摸感测时段Touch。触摸同步信号TSYNC在触摸感测时段Touch期间保持在低电平，并且在图像显示时段Display期间保持在高电平。
如果断开信号SD_OFF处于高电平，则开关控制部100断开第一开关LV_SW和第二开关HV_SW。当第一开关LV_SW断开时，低电压驱动模块LV_B从供电电压源I_VCC断开连接。当第二开关HV_SW断开时，高电压驱动模块HV_B从高电压源S_VDD断开连接。就是说，低电压驱动模块LV_B和高电压驱动模块HV_B在休眠模式期间均不操作。这样，由于源极驱动ICSD-IC在休眠模式期间中断，因此本发明的示例性实施例可以减少功耗。
在断开信号SD_OFF处于低电平时，如果触摸同步信号TSYNC是低电平，则开关控制部100接通第一开关LV_SW并且断开第二开关HV_SW。就是说，在活跃模式的触摸感测时段Touch期间中断高电压驱动模块HV_B。当高电压驱动模块HV_B不操作时，没有电压从通道输出到数据线。通过中断高电压驱动模块HV_B的操作，可以预期高阻抗模式(Hi-Z模式)效果，并且可以在触摸感测时段Touch期间稳定地执行感测操作。因此，本发明的示例性实施例允许通过使在触摸感测时段Touch期间消耗大量电力的高电压驱动模块HV_B的操作中断来改进功耗和稳定感测操作。
没有中断的触摸感测时段Touch期间的低电压驱动模块LV_B的正常操作与源极驱动ICSD-IC的恢复时间相关。
源极驱动ICSD-IC的恢复时间是源极驱动ICSD-IC从中断状态继续正常操作所需的时间。
下文将说明恢复时间。
CDR电路CDR通过将EPI时钟输入到时钟恢复电路中来生成(视频数据的RGB位的数目×2个)内部时钟。时钟恢复电路使用锁相环(以下称为“PLL”)或延迟锁定环路(以下称为“DLL”)输出内部时钟和掩码信号并且生成锁定信号LOCK。在CDR电路CDR的时钟恢复电路的操作中，需要特定量的时间用于时钟恢复，其被限定为Tlock(开机至DLL锁定时间)，如图8中所示的那样。在“Tlock”时段期间，源极驱动ICSD-IC的CDR电路CDR检查其是否与输入时钟同步，将反馈信号传送回定时控制器20，并且随后从定时控制器20接收正常数据RGB数据。
如上文所述，CDR电路CDR需要信号反馈时间用于执行时钟同步并且检查时钟同步是否完成。因此，在继续正常操作之前耗用相对长的时间。当在图像显示时段Display和触摸感测时段Touch保持交替的活跃模式的触摸感测时段Touch期间断开包括CDR电路CDR的低电压驱动模块LV_B时，针对图像显示时段的变换由于CDR电路CDR的恢复时间而变慢。因此，在本发明中，需要相对长的恢复时间段的低电压驱动模块LV_B在按间隔显示图像的活跃模式期间正常操作。
相反，由于在模拟电压输出的处理中仅需要缓冲器的模拟电压的上升时间和下降时间作为恢复时间，因此高电压驱动模块HV_B需要相对短的恢复时间段。因此，通过在触摸感测时段Touch期间不操作高电压驱动模块HV_B可以减少功耗。
在断开信号SD_OFF处于低电平时，如果触摸同步信号TSYNC是高电平，则开关控制部100接通第一开关LV_SW和第二开关HV_SW。就是说，在图像显示时段Display期间低电压驱动模块LV_B和高电压驱动模块HV_B二者均正常操作，从而显示图像。
尽管参照许多个说明性实施例描述了各实施例，但是应当理解，本领域技术人员可以设想落在本公开的原理的精神和范围内的许多其他的修改和实施例。更具体地，在本公开、附图和所附权利要求的范围内可以对主题组合布置的元件部分和/或布置进行各种变型和修改。除了元件部分和/或布置的变型和修改之外，替选的用途对于本领域技术人员而言也是明显的。

Claims (5)

1.一种触摸传感器集成型显示装置，包括：
显示面板，其上布置有数据线；
低电压驱动模块，其接收用于在所述显示面板上显示的图像数据并且实现对所述图像数据的数字信号处理；
高电压驱动模块，其生成与所述图像数据对应的数据电压并且将所述数据电压输出到所述数据线；
第一开关，其连接供电电压源和所述低电压驱动模块；
第二开关，其连接高电压源和所述高电压驱动模块；以及
开关控制部，其控制所述第一开关和所述第二开关的操作。
2.根据权利要求1所述的触摸传感器集成型显示装置，其中所述开关控制部通过使用如下信号来控制所述第一开关和所述第二开关：
断开信号，用于区分活跃模式和休眠模式；以及
触摸同步信号，用于在所述活跃模式期间区分图像显示时段和触摸感测时段。
3.根据权利要求2所述的触摸传感器集成型显示装置，其中所述开关控制部在所述休眠模式期间断开所述第一开关和所述第二开关二者。
4.根据权利要求2所述的触摸传感器集成型显示装置，其中所述开关控制部在所述触摸感测时段期间接通所述第一开关并且断开所述第二开关。
5.根据权利要求1所述的触摸传感器集成型显示装置，其中所述低电压驱动模块包括执行时钟同步并且生成内部时钟的数据时钟恢复电路。
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