CN101900906B - Liquid crystal display device with touch sensing function and touch sensing method thereof - Google Patents
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Abstract
Description
技术领域 technical field
本发明是有关于一种液晶显示装置,尤指一种具触碰感测功能的液晶显示装置与其触碰感测方法。 The invention relates to a liquid crystal display device, in particular to a liquid crystal display device with a touch sensing function and a touch sensing method thereof. the
背景技术 Background technique
液晶显示装置(Liquid Crystal Display,LCD)具有外型轻薄、省电以及低辐射等优点,因此已被广泛地应用于多媒体播放器、移动电话、个人数字助理(PDA)、计算机显示器、或平面电视等电子产品上。此外,利用液晶显示装置执行触碰输入的功能已渐成流行,亦即,触碰式液晶显示装置的应用越来越广泛。一般而言,触碰式液晶显示装置的触碰面板以电阻式触碰面板与电容式触碰面板为主。电阻式触碰面板是以电压降定位触碰位置,但无法提供多点触碰感测功能。电容式触碰面板通常包含感应电容,其将对应于触碰点的感应电容的电容变化作信号处理而定位出触碰位置。 Liquid crystal display (Liquid Crystal Display, LCD) has the advantages of light and thin appearance, power saving and low radiation, so it has been widely used in multimedia players, mobile phones, personal digital assistants (PDA), computer monitors, or flat-screen TVs and other electronic products. In addition, the function of using the liquid crystal display device to perform touch input has gradually become popular, that is, the application of the touch-type liquid crystal display device is becoming more and more extensive. Generally speaking, the touch panels of touch-type liquid crystal display devices are mainly resistive touch panels and capacitive touch panels. The resistive touch panel locates the touch position by voltage drop, but cannot provide multi-touch sensing function. The capacitive touch panel generally includes a sensing capacitor, which processes the capacitance change of the sensing capacitor corresponding to the touch point for signal processing to locate the touch position. the
图1为已知触碰面板装置的结构示意图。如图1所示,触碰面板装置100包含触碰面板101、多条读出线110、多个感应电容120、多个储存电容140、以及多个比较器150。当触碰面板101被触碰时,对应于触碰位置的感应电容120的电容值会变化,导致其电容电压跟着变化,此电容电压的变化会经由对应读出线110传输至对应储存电容140,再利用对应比较器150执行储存电容140的电容电压与参考电压Vref的比较处理即可产生触碰读出信号Sro。然而,随着触碰面板101的尺寸的增大,读出线110的线电阻跟着增大,所以在感应电容120的电容电压的变化量传输至储存电容140后,会因线电阻的压降而显着减小,导致低触碰灵敏度。另由于读出线110的寄生电容也跟着增大,如此会使从感应电容120至储存电容140的电容电压的传输延迟更严重,因而降低触碰反应速度。此外,对于追求外型轻薄与低成本的具触碰感测功能的显示装置而言,外贴于显示面板的触碰面板101并无法满足要求。
FIG. 1 is a schematic structural diagram of a known touch panel device. As shown in FIG. 1 , the
发明内容 Contents of the invention
依据本发明的实施例揭露一种具触碰感测功能的液晶显示装置,其包含用来传输扫描信号的扫描线、感测单元、以及读出线。感测单元电连接于扫描线,用来根据扫描信号以提供模拟读出信号。感测单元包含第一晶体管、第一电容、第二电容、以及第二晶体管。第一晶体管包含第一端、第二端与栅极端,其中第一端电连接于扫描线,第二端电连接于栅极端。第一电容电连接于扫描线与第一晶体管的第二端之间。第二电容包含第一端与第二端,其中第一端电连接于第一晶体管的第二端,第二端用来接收共享电压。第二晶体管包含第一端、第二端与栅极端,其中第一端电连接于扫描线,栅极端电连接于第一晶体管的第二端,第二端用来输出模拟读出信号。读出线电连接于第二晶体管的第二端,用来传输模拟读出信号。在感测单元的运作中,第二电容的电容值是随触碰事件而变更,据以产生对应于触碰事件的模拟读出信号。 An embodiment of the present invention discloses a liquid crystal display device with a touch sensing function, which includes scanning lines for transmitting scanning signals, sensing units, and readout lines. The sensing unit is electrically connected to the scan line and used for providing an analog readout signal according to the scan signal. The sensing unit includes a first transistor, a first capacitor, a second capacitor, and a second transistor. The first transistor includes a first terminal, a second terminal and a gate terminal, wherein the first terminal is electrically connected to the scan line, and the second terminal is electrically connected to the gate terminal. The first capacitor is electrically connected between the scan line and the second terminal of the first transistor. The second capacitor includes a first terminal and a second terminal, wherein the first terminal is electrically connected to the second terminal of the first transistor, and the second terminal is used for receiving the shared voltage. The second transistor includes a first terminal, a second terminal and a gate terminal, wherein the first terminal is electrically connected to the scan line, the gate terminal is electrically connected to the second terminal of the first transistor, and the second terminal is used for outputting an analog readout signal. The readout line is electrically connected to the second end of the second transistor for transmitting analog readout signals. During the operation of the sensing unit, the capacitance value of the second capacitor changes with the touch event, so as to generate an analog readout signal corresponding to the touch event. the
本发明还揭露一种触碰感测方法,其包含:提供具触碰感测功能的液晶显示装置,该液晶显示装置包含:扫描线,用来传输扫描信号;感测单元,电连接于该扫描线,用来根据该扫描信号以提供第一模拟读出信号,该感测单元包含:第一晶体管,包含第一端、第二端与栅极端,其中该第一端电连接于该扫描线,该第二端电连接于该栅极端;第一电容,电连接于该扫描线与该第一晶体管的第二端之间;第二电容,包含第一端与第二端,其中该第二电容的第一端电连接于该第一晶体管的第二端,该第二电容的第二端用采接收共享电压;以及第二晶体管,包含第一端、第二端与栅极端,其中该第二晶体管的第一端电连接于该扫描线,该第二晶体管的栅极端电连接于该第一晶体管的第二端,该第二晶体管的第二端用来输出该第一模拟读出信号;以及第一读出线,电连接于该第二晶体管的第二端,用来传输该第一模拟读出信号;其中该第二电容的电容值是随一触碰事件而变更,据以产生对应于该触碰事件的该第一模拟读出信号;于第一时段内,提供具低电平电压的该扫描信号至该扫描线;于该第一时段内,该感测单元根据该扫描信号将一感测电压重置为该低电平电压;于第二时段内,提供具高电平电压的该扫描信号至该扫描线;于该第二时段内,该感测单元根据该扫描信号的高电平电压以上拉该感测电压,其中该感测电压的增加量是受控于一触碰事件;以及于该第二时段内,该感测单元根据该感测电压与具该高电平电压的该扫描信号 以提供该第一模拟读出信号馈入至该第一读出线。 The present invention also discloses a touch sensing method, which includes: providing a liquid crystal display device with a touch sensing function, and the liquid crystal display device includes: scanning lines, used to transmit scanning signals; sensing units, electrically connected to the The scanning line is used to provide a first analog readout signal according to the scanning signal. The sensing unit includes: a first transistor including a first terminal, a second terminal and a gate terminal, wherein the first terminal is electrically connected to the scanning line, the second terminal is electrically connected to the gate terminal; the first capacitor is electrically connected between the scan line and the second terminal of the first transistor; the second capacitor includes a first terminal and a second terminal, wherein the The first terminal of the second capacitor is electrically connected to the second terminal of the first transistor, and the second terminal of the second capacitor is used to receive the shared voltage; and the second transistor includes a first terminal, a second terminal and a gate terminal, Wherein the first end of the second transistor is electrically connected to the scan line, the gate end of the second transistor is electrically connected to the second end of the first transistor, and the second end of the second transistor is used to output the first analog a readout signal; and a first readout line electrically connected to the second end of the second transistor for transmitting the first analog readout signal; wherein the capacitance value of the second capacitor changes with a touch event , so as to generate the first analog readout signal corresponding to the touch event; in the first period, provide the scan signal with a low level voltage to the scan line; in the first period, the sensing The unit resets a sensing voltage to the low level voltage according to the scanning signal; in the second period, the scanning signal with the high level voltage is provided to the scanning line; in the second period, the sensing The unit pulls up the sensing voltage according to the high level voltage of the scanning signal, wherein the increase of the sensing voltage is controlled by a touch event; and during the second period, the sensing unit pulls up the sensing voltage according to the sensing voltage and the scan signal with the high level voltage to provide the first analog readout signal fed to the first readout line. the
附图说明Description of drawings
图1为已知触碰面板装置的结构示意图。 FIG. 1 is a schematic structural diagram of a known touch panel device. the
图2为本发明具触碰感测功能的液晶显示装置的第一实施例示意图。 FIG. 2 is a schematic diagram of a first embodiment of a liquid crystal display device with a touch sensing function according to the present invention. the
图3为图2所示的液晶显示装置的工作相关信号波形示意图,其中横轴为时间轴。 FIG. 3 is a schematic diagram of operation-related signal waveforms of the liquid crystal display device shown in FIG. 2 , where the horizontal axis is the time axis. the
图4为本发明具触碰感测功能的液晶显示装置的第二实施例示意图。 FIG. 4 is a schematic diagram of a second embodiment of a liquid crystal display device with touch sensing function according to the present invention. the
图5为本发明具触碰感测功能的液晶显示装置的第三实施例示意图。 FIG. 5 is a schematic diagram of a third embodiment of the liquid crystal display device with touch sensing function of the present invention. the
图6为本发明具触碰感测功能的液晶显示装置的第四实施例示意图。 FIG. 6 is a schematic diagram of a fourth embodiment of a liquid crystal display device with a touch sensing function according to the present invention. the
图7为本发明具触碰感测功能的液晶显示装置的第五实施例示意图。 FIG. 7 is a schematic diagram of a fifth embodiment of the liquid crystal display device with touch sensing function of the present invention. the
图8为本发明具触碰感测功能的液晶显示装置的第六实施例示意图。 FIG. 8 is a schematic diagram of a sixth embodiment of the liquid crystal display device with touch sensing function of the present invention. the
图9为本发明具触碰感测功能的液晶显示装置的第七实施例示意图。 FIG. 9 is a schematic diagram of a seventh embodiment of a liquid crystal display device with touch sensing function according to the present invention. the
图10为本发明具触碰感测功能的液晶显示装置的第八实施例示意图。 FIG. 10 is a schematic diagram of an eighth embodiment of a liquid crystal display device with touch sensing function according to the present invention. the
图11为本发明触碰感测方法的流程图。 FIG. 11 is a flow chart of the touch sensing method of the present invention. the
[主要元件标号说明] [Description of main component labels]
具体实施方式 Detailed ways
下文依本发明具触碰感测功能的液晶显示装置与其触碰感测方法,特举实施例配合所附图式作详细说明,但所提供的实施例并非用以限制本发明所涵盖的范围,而方法流程步骤编号更非用以限制其执行先后次序,任何由方法步骤重新组合的执行流程,所产生具有均等功效的方法,皆为本发明所涵盖的范围。 The liquid crystal display device with touch-sensing function and its touch-sensing method according to the present invention will be described in detail below with specific embodiments in conjunction with the accompanying drawings, but the provided embodiments are not intended to limit the scope of the present invention. , and the step numbers of the method flow are not used to limit the order of their execution. Any method with the same effect produced by recombining the execution flow of the method steps is within the scope of the present invention. the
图2为本发明具触碰感测功能的液晶显示装置的第一实施例示意图。如 图2所示,液晶显示装置200包含多条扫描线201、多条数据线202、多个像素单元205、多条读出线220,多个感测单元230、以及信号处理电路250。每一条扫描线201用来传输对应扫描信号。每一条数据线202用来传输对应数据信号。每一像素单元205包含像素晶体管Qpx1、液晶电容Clc1与储存电容Cst1。像素晶体管Qpx1可为薄膜晶体管或场效晶体管。像素晶体管Qpx1包含第一端、第二端与栅极端,其中第一端电连接于对应数据线202以接收对应数据信号,栅极端电连接于对应扫描线201以接收对应扫描信号,第二端电连接于液晶电容Clc1与储存电容Cst1。像素晶体管Qpx1用来根据对应扫描信号以控制对应数据信号的写入运作,而像素单元205即根据被写入的对应数据信号以输出对应图像信号。每一条读出线220电连接于多个对应感测单元230,用来传输对应模拟读出信号。
FIG. 2 is a schematic diagram of a first embodiment of a liquid crystal display device with a touch sensing function according to the present invention. As shown in FIG. 2 , the liquid
信号处理电路250包含多个开关255、多个比较器260、多工器270、存储单元280、以及信号定位单元290。每一开关255电连接于对应读出线220,用来将对应模拟读出信号的电压重置为低电源电压Vss。每一比较器260包含正输入端、负输入端与输出端,其中正输入端用来接收参考电压Vref,负输入端电连接于对应读出线220以接收对应模拟读出信号,输出端电连接于多工器270,用来输出对应模拟读出信号与参考电压Vref比较所产生的对应数字读出信号。举例而言,比较器CP_j电连接于读出线RLj,用来比较模拟读出信号Sroa_j与参考电压Vref以产生数字读出信号Srod_j,而比较器CP_m则电连接于读出线RLm,用来比较模拟读出信号Sroa_m与参考电压Vref以产生数字读出信号Srod_m。在另一实施例中,比较器260的正输入端电连接于对应读出线220以接收对应模拟读出信号,而比较器260的负输入端则用来接收参考电压Vref。多工器270电连接于多个比较器260,用来将多个比较器260所产生的多个数字读出信号依序输出至存储单元280。存储单元280电连接于多工器270,用来储存多工器270依序输出的多个数字读出信号。信号定位单元290电连接于存储单元280,用来根据多个数字读出信号以产生触碰位置信号Spos。
The
在图2所示的实施例中,每一像素单元205均相邻感测单元230。在另一实施例中,感测单元230可间隔多条扫描线201而设置,或间隔多条数据线202而设置,亦即并非每一像素单元205均与感测单元230相邻。同理,读出线220可相对应地间隔多条数据线202而设置。每一感测单元230包含 第一晶体管231、第一电容232、第二电容233、以及第二晶体管234。第一晶体管231与第二晶体管234可为薄膜晶体管(Thin Film Transistor)或场效晶体管(Field Effect Transistor)。下文依感测单元DXn_m以说明各元件的耦合关系与电路运作原理。
In the embodiment shown in FIG. 2 , each
第一晶体管231包含第一端、第二端与栅极端,其中第一端电连接于扫描线SLn以接收扫描信号SSn,第二端电连接于栅极端。第一电容232包含第一端与第二端,其中第一端电连接于扫描线SLn,第二端电连接于第一晶体管231的第二端。在较佳实施例中,第一电容232的第二端直接连接于第一晶体管231的栅极端,据以缩小电路布局面积。第二电容233包含第一端与第二端,其中第一端电连接于第一晶体管231的第二端,第二端用来接收共享电压Vcom。第二晶体管234包含第一端、第二端与栅极端,其中第一端电连接于扫描线SLn,第二端电连接于读出线RLm,栅极端电连接于第二电容233的第一端以接收感测电压VDn_m。当扫描信号SSn具低电平电压时,第一晶体管231是在导通状态,据以将感测电压VDn_m重置为低电平电压。当扫描信号SSn由低电平电压切换为高电平电压时,第一晶体管231切换为截止状态使感测电压VDn_m成为浮接电压,同时可通过第一电容232的耦合作用以上拉感测电压VDn_m,被上拉的感测电压VDn_m可以下列公式(1)表示。
The
在公式(1)中,C1为第一电容232的电容值,C2为第二电容233的电容值,Vgh为扫描信号SSn的高电平电压,Vgl为扫描信号SSn的低电平电压。第二电容233的电容值C2是随触碰事件而变更,据以控制感测电压VDn_m被上拉的增加量。在一实施例中,当对应于感测单元DXn_m的面板位置发生触碰事件时,第二电容233的电容值C2会增加,从而减少感测电压VDn_m被上拉的增加量。在感测单元DXn_m的运作中,感测电压VDn_m用来控制第二晶体管234的导通/截止状态,进而控制将扫描信号SSn的高电平电压馈入至读出线RLm以设定模拟读出信号Sroa_m的电压,所以感测电压VDn_m的作用并不会因读出线RLm的线电阻的增加而降低效能,换句话说,感测单元DXn_m的触碰灵敏度并不会因读出线RLm的线电阻的增加而降低。此外,由于感测单元230被集成于包含像素单元205的显示面板内,所以可使液晶显示装置200的外型更轻薄,并能降低其生产成本。
In formula (1), C1 is the capacitance of the
图3为图2所示的液晶显示装置200的工作相关信号波形示意图,其中横轴为时间轴。在图3中,由上往下的信号分别为扫描信号SSn-1、扫描信号SSn、感测电压VDn-1_m、以及感测电压VDn_m。如图3所示,于时段T1内,扫描信号SSn-1与扫描信号SSn均具低电平电压Vgl,所以感测电压VDn-1_m与感测电压VDn_m均被重置为低电平电压Vgl。于时段T2内,扫描信号SSn-1由低电平电压Vgl切换为高电平电压Vgh,所以感测单元DXn-1_m可据其第一电容232的耦合作用将感测电压VDn-1_m上拉至第一高电压Vh1。于时段T3内,扫描信号SSn由低电平电压Vgl切换为高电平电压Vgh,所以感测单元DXn_m可据其第一电容232的耦合作用将感测电压VDn_m上拉至第一高电压Vh1。于时段T4内,扫描信号SSn-1与扫描信号SSn均具低电平电压Vgl,所以感测电压VDn-1_m与感测电压VDn_m又被重置为低电平电压Vgl。
FIG. 3 is a schematic diagram of operation-related signal waveforms of the liquid
于时段T5内,扫描信号SSn由低电平电压Vgl切换为高电平电压Vgh,此时由于对应于感测单元DXn_m的面板位置发生第一触碰事件,导致感测单元DXn_m的第二电容233的电容值上升,所以感测电压VDn_m被上拉至低于第一高电压Vh1的第二高电压Vh2,而感测单元DXn_m的第二晶体管234即根据第二高电压Vh2以输出对应于第一触碰事件的模拟读出信号Sroa_m,使信号处理电路250可据以产生对应于第一触碰事件的触碰位置信号Spos。于时段T6内,扫描信号SSn-1由低电平电压Vgl切换为高电平电压Vgh,此时由于对应于感测单元DXn-1_m的面板位置发生第二触碰事件,导致感测单元DXn-1_m的第二电容233的电容值上升,所以感测电压VDn-1_m被上拉至低于第一高电压Vh1的第三高电压Vh3,而感测单元DXn-1_m的第二晶体管234即根据第三高电压Vh3以输出对应于第二触碰事件的模拟读出信号Sroa_m,使信号处理电路250可据以产生对应于第二触碰事件的触碰位置信号Spos。
In the period T5, the scan signal SSn switches from the low-level voltage Vgl to the high-level voltage Vgh. At this time, because the first touch event occurs at the panel position corresponding to the sensing unit DXn_m, the second capacitance of the sensing unit DXn_m The capacitance value of 233 increases, so the sensing voltage VDn_m is pulled up to the second high voltage Vh2 lower than the first high voltage Vh1, and the
图4为本发明具触碰感测功能的液晶显示装置的第二实施例示意图。如图4所示,液晶显示装置300类似于图2所示的液晶显示装置200,主要差异在于将信号处理电路250置换为信号处理电路350。信号处理电路350包含多个开关355、多工器370、比较器360、存储单元380、以及信号定位单元390。每一开关355电连接于对应读出线220,用来将对应模拟读出信号的电压重置为低电源电压Vss。多工器370电连接于多条读出线220,用来将多个模拟读出信号依序输出至比较器360。请注意,图2所示的多工器270为数字多工器,而多工器370则为模拟多工器。比较器360包含正输入端、负 输入端与输出端,其中正输入端用来接收参考电压Vref,负输入端电连接于多工器370以依序接收模拟读出信号,输出端电连接于存储单元380,用来输出模拟读出信号与参考电压Vref比较所产生的数字读出信号。在另一实施例中,比较器360的正输入端电连接于多工器370以依序接收模拟读出信号,而比较器360的负输入端则用来接收参考电压Vref。存储单元380电连接于比较器360,用来储存比较器360依序产生的数字读出信号。信号定位单元390电连接于存储单元380,用来根据多个数字读出信号以产生触碰位置信号Spos。液晶显示装置300的其余功能运作是类同于液晶显示装置200,不再赘述。
FIG. 4 is a schematic diagram of a second embodiment of a liquid crystal display device with touch sensing function according to the present invention. As shown in FIG. 4 , the liquid
图5为本发明具触碰感测功能的液晶显示装置的第三实施例示意图。如图5所示,液晶显示装置400类似于图2所示的液晶显示装置200,主要差异在于将多个感测单元230置换为多个感测单元330。感测单元330的内部结构是类似于图2所示的感测单元230,主要差异在于另设置第三晶体管235,用来根据扫描信号以控制模拟读出信号的输出运作。第三晶体管235包含第一端、第二端与栅极端,其中第一端电连接于第二晶体管234的第二端,栅极端电连接于扫描线201以接收扫描信号,第二端电连接于读出线220。第三晶体管235可为薄膜晶体管或场效晶体管。当扫描信号具低电平电压时,第三晶体管235是在截止状态以除能模拟读出信号的输出运作,亦即此时第三晶体管235用来辅助第二晶体管234以停止输出模拟读出信号。或者,当扫描信号具高电平电压时,第三晶体管235是在导通状态以致能模拟读出信号的输出运作。液晶显示装置400的其余功能运作是类同于液晶显示装置200,不再赘述。
FIG. 5 is a schematic diagram of a third embodiment of the liquid crystal display device with touch sensing function of the present invention. As shown in FIG. 5 , the liquid
图6为本发明具触碰感测功能的液晶显示装置的第四实施例示意图。如图6所示,液晶显示装置500类似于图5所示的液晶显示装置400,主要差异在于将信号处理电路250置换为信号处理电路350。信号处理电路350的内部结构与功能运作已详述于液晶显示装置300的说明中,不再赘述。
FIG. 6 is a schematic diagram of a fourth embodiment of a liquid crystal display device with a touch sensing function according to the present invention. As shown in FIG. 6 , the liquid crystal display device 500 is similar to the liquid
图7为本发明具触碰感测功能的液晶显示装置的第五实施例示意图。如图7所示,液晶显示装置600包含多条扫描线601、多条数据线602、多条栅极线603、多个像素单元605、多条读出线620,多个感测单元630、以及信号处理电路250。每一条扫描线601用来传输对应扫描信号。每一条数据线602用来传输对应数据信号。每一条栅极线603用来传输对应栅极信号。请 注意,栅极信号的频率可相同或相异于扫描信号的频率,栅极信号的高电平电压可相同或相异于扫描信号的高电平电压,栅极信号的低电平电压可相同或相异于扫描信号的低电平电压。每一像素单元605包含像素晶体管Qpx2、液晶电容Clc2与储存电容Cst2。像素晶体管Qpx2可为薄膜晶体管或场效晶体管。像素晶体管Qpx2包含第一端、第二端与栅极端,其中第一端电连接于对应数据线602以接收对应数据信号,栅极端电连接于对应栅极线603以接收对应栅极信号,第二端电连接于液晶电容Clc2与储存电容Cst2。像素晶体管Qpx2用来根据对应栅极信号以控制对应数据信号的写入运作,而像素单元605即根据被写入的对应数据信号以输出对应图像信号。每一条读出线620电连接于多个对应感测单元630,用来传输对应模拟读出信号。信号处理电路250的内部结构与功能运作已详述于液晶显示装置200之的说明中,不再赘述。
FIG. 7 is a schematic diagram of a fifth embodiment of the liquid crystal display device with touch sensing function of the present invention. As shown in FIG. 7 , the liquid
在图7所示的实施例中,每一像素单元605均相邻感测单元630。在另一实施例中,感测单元630可间隔多条栅极线603而设置,或间隔多条数据线602而设置,亦即并非每一像素单元605均与感测单元630相邻。同理,扫描线601可相对应地间隔多条栅极线603而设置,而读出线620可相对应地间隔多条数据线602而设置。每一感测单元630包含第一晶体管631、第一电容632、第二电容633、以及第二晶体管634。第一晶体管631与第二晶体管634可为薄膜晶体管或场效晶体管。下文依感测单元DYn_m以说明各元件的耦合关系与电路运作原理。
In the embodiment shown in FIG. 7 , each
第一晶体管631包含第一端、第二端与栅极端,其中第一端电连接于扫描线SLn以接收扫描信号SSn,第二端电连接于栅极端。第一电容632包含第一端与第二端,其中第一端电连接于扫描线SLn,第二端电连接于第一晶体管631的第二端。在较佳实施例中,第一电容632的第二端直接连接于第一晶体管631的栅极端,据以缩小电路布局面积。第二电容633包含第一端与第二端,其中第一端电连接于第一晶体管631的第二端,第二端用来接收共享电压Vcom。第二晶体管634包含第一端、第二端与栅极端,其中第一端电连接于扫描线SLn,第二端电连接于读出线RLm,栅极端电连接于第二电容633的第一端以接收感测电压VDn_m。第一晶体管631、第一电容632、第二电容633与第二晶体管634的功能运作是类同于图2所示的第一晶体管231、第一电容232、第二电容233与第二晶体管234的功能运作,所以感测单元 DYn_m的触碰灵敏度并不会因读出线RLm的线电阻的增加而降低。此外,由于感测单元630被集成于包含像素单元605的显示面板内,所以可使液晶显示装置600的外型更轻薄,并能降低其生产成本。
The
图8为本发明具触碰感测功能的液晶显示装置的第六实施例示意图。如图8所示,液晶显示装置700类似于图7所示的液晶显示装置600,主要差异在于将信号处理电路250置换为信号处理电路350。信号处理电路350的内部结构与功能运作已详述于液晶显示装置300的说明中,不再赘述。
FIG. 8 is a schematic diagram of a sixth embodiment of the liquid crystal display device with touch sensing function of the present invention. As shown in FIG. 8 , the liquid
图9为本发明具触碰感测功能的液晶显示装置的第七实施例示意图。如图9所示,液晶显示装置800类似于图7所示的液晶显示装置600,主要差异在于将多个感测单元630置换为多个感测单元730。感测单元730的内部结构是类似于图7所示的感测单元630,主要差异在于另设置第三晶体管635,用来根据扫描信号以控制模拟读出信号的输出运作。第三晶体管635包含第一端、第二端与栅极端,其中第一端电连接于第二晶体管634的第二端,栅极端电连接于扫描线601以接收扫描信号,第二端电连接于读出线620。第三晶体管635可为薄膜晶体管或场效晶体管。当扫描信号具低电平电压时,第三晶体管635是在截止状态以除能模拟读出信号的输出运作,亦即此时第三晶体管635用来辅助第二晶体管634以停止输出模拟读出信号。或者,当扫描信号具高电平电压时,第三晶体管635是在导通状态以致能模拟读出信号的输出运作。液晶显示装置800的其余功能运作是类同于液晶显示装置600,不再赘述。
FIG. 9 is a schematic diagram of a seventh embodiment of a liquid crystal display device with touch sensing function according to the present invention. As shown in FIG. 9 , the liquid
图10为本发明具触碰感测功能的液晶显示装置的第八实施例示意图。如图10所示,液晶显示装置900是类似于图9所示的液晶显示装置800,主要差异在于将信号处理电路250置换为信号处理电路350。信号处理电路350的内部结构与功能运作已详述于图4的液晶显示装置300的说明,不再赘述。
FIG. 10 is a schematic diagram of an eighth embodiment of a liquid crystal display device with touch sensing function according to the present invention. As shown in FIG. 10 , the liquid
图11为本发明触碰感测方法的流程图。图11所示的流程990为基于上述本发明第一至第八实施例的液晶显示装置200~900的触碰感测方法。流程990所示的触碰感测方法包含下列步骤:
FIG. 11 is a flow chart of the touch sensing method of the present invention. The
步骤S910:于第一时段内,提供具低电平电压的扫描信号至扫描线; Step S910: providing a scan signal with a low level voltage to the scan line during the first period;
步骤S915:于第一时段内,感测单元根据扫描信号将感测电压重置为低电平电压; Step S915: During the first period, the sensing unit resets the sensing voltage to a low level voltage according to the scanning signal;
步骤S920:于第二时段内,提供具高电平电压的扫描信号至扫描线; Step S920: providing a scan signal with a high level voltage to the scan line during the second period;
步骤S925:于第二时段内,感测单元根据扫描信号的高电平电压以上拉感测电压,其中感测电压的增加量是受控于触碰事件; Step S925: During the second period, the sensing unit pulls up the sensing voltage according to the high-level voltage of the scanning signal, wherein the increase of the sensing voltage is controlled by the touch event;
步骤S930:于第二时段内,感测单元根据感测电压与具高电平电压的扫描信号以提供模拟读出信号馈入至读出线; Step S930: During the second period, the sensing unit provides an analog readout signal to feed into the readout line according to the sensing voltage and the scanning signal with a high level voltage;
步骤S935:于第二时段内,信号处理电路将模拟读出信号转换为数字读出信号; Step S935: During the second period, the signal processing circuit converts the analog readout signal into a digital readout signal;
步骤S940:于第三时段内,信号处理电路根据数字读出信号产生触碰位置信号;以及 Step S940: During the third period, the signal processing circuit generates a touch position signal according to the digital readout signal; and
步骤S945:于第三时段内,信号处理电路将模拟读出信号的电压重置为低电源电压。 Step S945: During the third period, the signal processing circuit resets the voltage of the analog readout signal to a low power supply voltage. the
在上述触碰感测方法的流程990中,感测单元另可于第一时段内根据扫描信号的低电平电压以除能该模拟读出信号的输出运作,以及于第二时段内根据扫描信号的高电平电压以致能该模拟读出信号的输出运作。
In the
综上所述,在本发明液晶显示装置的感测单元的运作中,感测电压用来控制感测单元的第二晶体管的导通/截止状态,进而控制将扫描信号的高电平电压馈入至读出线以设定模拟读出信号的电压,所以感测电压的作用并不会因读出线的线电阻的增加而降低效能,亦即触碰灵敏度不会因读出线的线电阻的增加而降低。此外,本发明液晶显示装置的感测单元被集成于包含像素单元的显示面板内,所以可使其外型更轻薄,并能降低生产成本。 To sum up, in the operation of the sensing unit of the liquid crystal display device of the present invention, the sensing voltage is used to control the on/off state of the second transistor of the sensing unit, thereby controlling the feeding of the high-level voltage of the scanning signal to Input to the readout line to set the voltage of the analog readout signal, so the effect of the sensing voltage will not reduce the performance due to the increase of the line resistance of the readout line, that is, the touch sensitivity will not be affected by the line resistance of the readout line decrease with an increase in resistance. In addition, the sensing unit of the liquid crystal display device of the present invention is integrated in the display panel including the pixel unit, so the appearance can be made lighter and thinner, and the production cost can be reduced. the
虽然本发明已以实施例揭露如上,然其并非用以限定本发明,任何具有本发明所属技术领域的通常知识者,在不脱离本发明的精神和范围内,当可作各种更动与润饰,因此本发明的保护范围当视所附的权利要求范围所界定者为准。 Although the present invention has been disclosed above with embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Modification, therefore, the scope of protection of the present invention should be defined by the scope of the appended claims. the
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