WO2015100826A1 - 内置触控的液晶显示装置 - Google Patents

内置触控的液晶显示装置 Download PDF

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Publication number
WO2015100826A1
WO2015100826A1 PCT/CN2014/071269 CN2014071269W WO2015100826A1 WO 2015100826 A1 WO2015100826 A1 WO 2015100826A1 CN 2014071269 W CN2014071269 W CN 2014071269W WO 2015100826 A1 WO2015100826 A1 WO 2015100826A1
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WO
WIPO (PCT)
Prior art keywords
touch
line
thin film
film transistor
touch sensing
Prior art date
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Ceased
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PCT/CN2014/071269
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English (en)
French (fr)
Inventor
徐向阳
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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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Priority to US14/240,384 priority Critical patent/US9274630B2/en
Publication of WO2015100826A1 publication Critical patent/WO2015100826A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0447—Position sensing using the local deformation of sensor cells

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a liquid crystal display device with built-in touch. Background technique
  • touch technology includes low cost, high yield, large size, and high reliability.
  • indium tin oxide sensor ITO Sensor
  • cover glass Cover ie
  • TFT thin film transistors
  • indium tin oxide yttrium
  • soft film and substrate technology can be developed, or new plastic materials can be used to replace expensive tempered glass on the material of cover glass.
  • PMMA polymethyl methacrylate
  • the in-cell touch (In-Ceil) structure has high integration and low pass rate, but the overall thickness of the touch device is thin and light.
  • Figure 1 Figure 2, Figure 3 show the three in-line t-Ceii touch technologies: photosensitive, capacitive, and resistive.
  • FIG. 1 shows a photosensitive touch technology, which has multiple implementation methods.
  • the typical method is to form a large current on the photosensitive switch on the first substrate 1 under the illumination of the laser pen, and the position of the switch that generates the current can be determined by Determine the touch location.
  • FIG. 2 shows a capacitive touch technology in which the thickness of the liquid crystal layer at the pressed position changes after the second substrate 2 is pressed, and the corresponding liquid crystal capacitance value changes, and the touch position can be determined by determining the position at which the liquid crystal capacitance changes.
  • the pad contact can determine the touch position by judging the position of the lateral sensing line and the position of the longitudinal sensing line where the short circuit occurs.
  • the in-cell (In Cdi) touch technology has a low pixel aperture ratio, is difficult to apply to a large-sized panel, and the touch driving circuit is rather complicated, and the present invention presses the prior art. Capacitive built-in touch devices have been improved.
  • the invention provides a liquid crystal display device with built-in touch.
  • the device includes an array substrate, a color filter substrate opposite to the array substrate, and a liquid crystal layer between the array substrate and the color filter substrate, wherein the array substrate is provided with a first scan line intersecting vertically and horizontally And the data line, the first scan line and the data line intersect to define a plurality of pixel units, the pixel unit includes at least: three pixel sub-units, each of the pixel sub-units is provided with a first thin film transistor and a pixel electrode, The device is provided with a touch sensing line, and in at least a part of the pixel units, corresponding to at least one of the pixel subunits, a touch capacitor is disposed, and the touch capacitor and the touch sensing line are disposed.
  • a touch switch capable of turning on or off the two, wherein a pressure difference of the touch capacitor can be transmitted to the touch sensing line.
  • the invention improves the existing pressure-capacitor built-in touch device, solves the shortcomings of the current device, improves the pixel aperture ratio, and enables the pressed capacitive built-in touch technology to be applied to a large-sized panel, and Simplified touch drive circuit.
  • the touch capacitance comprises a conductive pad located in a corresponding one of the pixel sub-units of the array substrate and a conductive element located at a position of the color filter substrate opposite to the conductive pad.
  • the electrically conductive element is connected to a common line for providing a reference voltage.
  • the touch sensing line is connected to an amplifier capable of detecting a differential pressure change signal.
  • a voltage difference is formed between the conductive pad and the conductive element, and the voltage difference is related to the capacitance of the touch capacitor. Since the touch sensing Liu line is connected to an amplifier capable of detecting the differential pressure change signal, the device according to the present invention can effectively and accurately detect the position where the pressure difference or the capacitance changes, and complete the touch process.
  • the touch switch includes a second thin film transistor, the second thin film transistor includes a gate connected to the first scan line, a source connected to the touch sensing line, and the The drain of the conductive pad connection.
  • the touch sensing line is parallel to the data line, and/or the touch sensing line is formed in the same layer as the data line.
  • the parallel arrangement of the touch sensing line and the data line facilitates the routing cloth of the array substrate This saves the wiring space while minimizing the intersection between the traces, effectively reducing the probability of circuit failures that may occur at the intersection.
  • the manufacture of touch sensing lines and data lines in the same layer simplifies the fraudulent process, saves manufacturing materials, and reduces the cost of mass production, which brings significant advances compared to the prior art.
  • a source of the second thin film transistor is connected to a region of the touch sensing line that intersects the first scan line. This reduces the blocking of light and increases the opening area and the mouth rate. The display effect of the liquid crystal panel and the utilization of light energy are enhanced.
  • the touch sensing line is parallel to the first scan line, and/or the touch sensing line is formed in the same layer as the first scan line.
  • the parallel arrangement of the touch sensing line and the first scanning line facilitates the routing arrangement of the array substrate, saves the wiring space, and minimizes the intersection between the lines, thereby effectively reducing the possibility of occurrence at the intersection.
  • the probability of a circuit failure In the same layer, the touch sensing line and the first scanning line are simplistic, which simplifies the manufacturing process, saves the production materials, and reduces the cost of mass production, which brings significant advancement compared with the existing technology.
  • a source of the second thin film transistor is connected to one end of a connection line, the connection line is formed in the same layer as the data line, and the other end of the connection line is connected to the touch through a via hole Control the sense line.
  • the active layer of the second thin film transistor is formed in the same layer as the active layer of the first thin film transistor.
  • the manufacturing process is simplified, the production materials are saved, and the cost of mass production is reduced, which brings significant advances compared to the prior art.
  • the position of the second thin film transistor, the conductive pad and the conductive element at least partially overlaps the position of the first scan line as viewed in a normal direction of the liquid crystal panel.
  • the blocking of the light is reduced, and the opening area and the aperture ratio are increased.
  • the display effect of the liquid crystal panel is enhanced.
  • the apparatus further includes a second scan line parallel to the first scan line and formed in the same layer, the second scan line being connected to a gate of the third thin film transistor, And a source of the third thin film transistor is connected to the touch sensing line for discharging a charge.
  • the invention improves the existing pressure-capacitor built-in touch device, solves the shortcomings of the current device, improves the pixel mouth-opening rate, and enables the pressed capacitive built-in touch technology to be applied to a large-sized panel.
  • the touch drive circuit is also integrated.
  • FIG. 1 shows a photosensitive touch technology in the prior art
  • FIG. 2 shows a capacitive touch technology in the prior art
  • FIG. 3 shows a resistive touch technology in the prior art
  • FIG. 4 is a schematic structural view of a liquid crystal display device with built-in touch according to the present invention
  • FIG. 5 is a cross-sectional view of the liquid crystal display device with built-in touch according to the present invention along the normal direction of the panel;
  • FIG. 6 is a circuit diagram of a liquid crystal display device with built-in touch according to the present invention.
  • FIG. 7 is a schematic view showing a first embodiment of a liquid crystal display device with built-in touch according to the present invention
  • FIG. 8 is a view showing a sequence of scanning signals according to a first embodiment of the present invention
  • FIG. 9 is a schematic view showing a second embodiment of a liquid crystal display device with built-in touch according to the present invention.
  • FIG. 10 is a timing chart showing a scan signal according to a second embodiment of the present invention.
  • Fig. 5 is a cross-sectional view showing the liquid crystal display device with a touch built in the normal direction of the panel according to the present invention.
  • the liquid crystal display device with built-in touch includes an array substrate 22, a color filter substrate 21 opposite to the array substrate 22, and a liquid crystal layer 24 between the array substrate 22 and the color filter substrate 21. .
  • FIG. 4 is a schematic view showing the structure of a liquid crystal display device with built-in touch according to the present invention.
  • the array substrate 22 is provided with a first scan line 12 and a data line 11 intersecting vertically and horizontally.
  • the first scan line 12 and the data line ii intersect to define a plurality of pixel units.
  • One pixel unit to Less includes ⁇ : a pixel sub-unit (R, G, B) corresponding to the primary colors red, green and blue of the liquid crystal display panel.
  • Each of the pixel sub-units is provided with a first thin film transistor 6 and a pixel electrode.
  • the touch sensing line 13 is provided.
  • the touch sensing line 13 is connected to an amplifier capable of detecting a differential pressure change signal.
  • the touch capacitor 23, the touch sensing line 13 and the touch switch 14 are all disposed corresponding to the blue pixel subunit. However, this is not limitative, and the touch capacitor 23 and the touch switch can also be set corresponding to the green pixel sub-unit or the red pixel sub-unit. For each liquid crystal pixel unit, the number of the corresponding touch capacitor 23, the touch sensing line 13, and the touch switch 14 is not limited to one, and may be based on the demand for touch resolution. Set to the appropriate amount.
  • the touch capacitor 23 includes a conductive pad 15 in a corresponding pixel sub-unit of the array substrate 22 and a conductive element at a position of the color filter substrate 21 opposite to the conductive pad 15.
  • the conductive elements are connected to a common line for providing a reference voltage.
  • Fig. 6 is a circuit diagram showing a liquid crystal display device with built-in touch according to the present invention. Referring to Figure 6, it can be seen that a voltage difference is formed between the conductive pad 15 and the conductive member, and the voltage difference is related to the capacitance of the touch capacitor 23. Since the touch sensing line 13 is connected to an amplifier capable of detecting a differential pressure change signal, the apparatus according to the present invention can effectively and accurately trace back to a position where a pressure difference or a capacitance changes to complete the touch process.
  • the touch switch 14 includes a second thin film transistor including a cabinet connected to the scan line 12 , a source connected to the touch sensing line 13 , and a drain connected to the conductive pad 15 .
  • the pole (in Figure 7) 3 ⁇ 4 is marked with 37).
  • Fig. 7 is a view showing a first embodiment of a liquid crystal display device with built-in touch according to the present invention
  • Fig. 8 is a timing chart showing a scanning signal according to a first embodiment of the present invention.
  • the touch sensing line 34 is parallel to the data line 32.
  • the touch sensing line 34 is formed in the same layer as the data line 32.
  • the parallel arrangement of the touch sensing line 34 and the data line 32 facilitates the routing arrangement of the array substrate, saves the wiring space, minimizes the intersection between the traces, and effectively reduces the possibility of occurrence at the intersection. The probability of a circuit failure at the location.
  • manufacturing touch sensing in the same layer Line 34 and data line 32 simplify the fabrication process, save on manufacturing materials, and reduce the cost of large-scale production, which represents a significant improvement over the prior art.
  • the source of the second thin film transistor is connected to a region of the touch sensing line 34 that intersects the scan line 30. This reduces the barrier to light and increases the cornice area and aperture ratio. The display effect of the liquid crystal panel and the profitability of light energy are enhanced.
  • the active layer 35 of the second thin film transistor is formed in the same layer as the active layer 31 of the first thin film transistor. In this way, the manufacturing process is simplified, the production materials are saved, and the cost of mass production is reduced, which brings significant progress over the prior art.
  • the position of the second thin film transistor, the conductive pad and the conductive member 36 at least partially overlaps the position of the first scanning line 30 as viewed in the normal direction of the liquid crystal panel. In this way, the blocking of the light is reduced, and the opening area and the aperture ratio are increased. The display effect of the liquid crystal panel is enhanced.
  • the capacitance value of the touch capacitor 23 changes, and the change in the voltage difference between the conductive element and the conductive pad 5 is transmitted to the touch sensing line through the touch switch 14. It is then detected by the amplifier to locate the touch.
  • Fig. 9 is a view showing a second embodiment of a liquid crystal display device with built-in touch according to the present invention
  • Fig. 10 is a schematic view showing a scanning signal according to a second embodiment of the present invention.
  • the touch sensing line 47 is parallel to the first scanning line 41.
  • the touch sensing line 47 is formed in the same layer as the first scanning line 41.
  • the parallel arrangement of the touch sensing line 47 and the first scan line 41 facilitates the routing arrangement of the array substrate, saves the wiring space, and minimizes the intersection between the traces, effectively reducing the possibility of crossover. The probability of a circuit failure at the point.
  • the source of the second thin film transistor is connected to one end of the connection line 48, and the connection line 48 is formed in the same layer as the data line 43.
  • An intermediate layer 49 is present between the dry connecting line 48 and the touch sensing line 47, and the other end of the connecting line 48 is connected to the touch sensing line 47 through the via 40.
  • the active layer 46 of the second thin film transistor is formed in the same layer as the active layer 42 of the first thin film transistor. In this way, the manufacturing process is simplified, the production materials are saved, and the cost of mass production is reduced, which brings significant progress over the prior art.
  • the position 45 of the second thin film transistor, the conductive pad and the conductive member at least partially overlaps the position of the first scan line 41 as viewed in the normal direction of the liquid crystal panel. In this way, minus The light blockage increases the opening area and aperture ratio. The display effect of the liquid crystal panel is enhanced.
  • the capacitance value of the touch capacitor 23 changes, and the change in the voltage difference between the conductive element and the conductive pad 15 is transmitted to the touch sensing line through the touch switch 14. Up, and then detected by the amplifier, to position the touch.
  • the apparatus according to the present invention further includes a second scan line parallel to the first scan line 12 and formed in the same layer, the second scan line being connected to the third thin film transistor a gate, and a source of the third thin film transistor is connected to the touch sensing line 13.
  • This structure ⁇ releases the charge, keeps the touch effective for a long time, and prolongs the life of the device, reducing the possibility of damage to the line.
  • the material of the conductive member may be polystyrene (:PS).
  • the invention improves the existing pressure-capacitor built-in touch device, solves the shortcomings of the current device, improves the pixel aperture ratio, and enables the pressed capacitive built-in touch technology to be applied to a large-sized panel, and
  • the touch drive circuit is integrated.

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  • General Physics & Mathematics (AREA)
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Abstract

一种内置触控的液晶显示装置，属于液晶显示技术领域。所述装置设置有触控感测线，且在至少一部分像素单元中，对应于至少一个所述像素子单元设置有触控电容以及位于所述触控电容和所述触控感测线之间的能够将二者导通或断开的触控开关，其中所述触控电容的压差能够传递到所述触控感测线。对现有的按压电容式内置触控装置进行了改进，解决了目前此类装置存在的缺点，提高了像素开口率，使按压电容式内置触控技术可以应用到大尺寸面板上，并且简化了触控驱动电路。

Description

内置触控的液晶显示装置 技术领域
本发明涉及液晶显示技术领域， 尤其涉及一种内置触控的液晶显示装置。 背景技术
触控技术的发展方向包括低成本、 高良率、 大尺寸、 高可靠性等目标。
为了达到这些目标， 在工艺技术上， 可以将氧化铟锡传感器 (ITO Sensor)与盖 板玻璃 (Cover ie )—同整合，甚至连薄膜晶体管 (TFT)都一同整合， 以降低生产成 本、 使产品厚度变薄， 更可避免贴合不良的问题。
在材料技术上， 可发展氧化铟锡 (ΓΓΟ)的有机或无机替代材料、 开发软性薄膜 及基板技术， 或在盖板玻璃 (Cover le )的材料上采用新塑料材料替代较昂贵的强 化玻璃或聚甲基丙烯酸甲酯 (PMMA)塑料板。 在结构技术上， 发展了外挂式触控
(On- Cell)和内嵌式触控 (In- Ceil)等内置触控结构。
内嵌式触控 (In-Ceil)结构的集成度高、 合格率低， 但触控装置的整体厚度薄， 重量轻。
图 1、 图 2和图 3分别显示了常 ¾的三种内嵌式 t -Ceii)触控技术： 光敏式、 电容式和电阻式。
图 1显示了光敏式触控技术， 其具体实现方法有多重， 典型方法是在激光笔 的照射下， 在第一基板 1上的光敏开关上形成较大电流， 通过判断产生电流的开 关位置可以确定触控位置。
图 2显示了电容式触控技术， 即在按压第二基板 2后， 按压位置的液晶层厚 度发生变化， 相应的液晶电容值发生变化， 通过判断发生液晶电容变化的位置可 以确定触控位置。
图 3显示了电阻式触控技术， 即在按压第二基板 2后， 第二基板 2的导电层 分别与第一基板 1 上的连接橫向感测线的导电垫和连接纵向感测线的导电垫接 触， 通过判断发生短路的横向感测线位置和纵向感测线位置可以确定触控位置。
然而， 现有技术中的内嵌式 (Iii-Celi)触控技术像素开口率低、难以应 ]¾到大尺 寸面板上， 并且触控的驱动电路颇为复杂。 发明内容
针对现有技术中的内嵌式 (In Cdi)触控技术像素开口率低、难以应用到大尺寸 面板上， 并且触控的驱动电路颇为复杂等不足， 本发明对现有技术中的按压电容 式内置触控装置进行了改进。
本发明提出了一种内置触控的液晶显示装置。
所述装置包括阵列基板、 与所述阵列基板相对的彩膜基板、 以及位于所述阵 列基板和所述彩膜基板之间的液晶层， 所述阵列基板上设有纵横交叉的第一扫描 线和数据线， 所述第一扫描线和数据线交叉限定多个像素单元， 所述像素单元至 少包括：三个像素子单元， 每个像素子单元均设有第一薄膜晶体管和像素电极， 所 述装置设置有触控感测线， 且在至少一部分像素单元中， 对应于至少 ·个所述像 素子单元设置有触控电容以及位干所述触控电容和所述触控感测线之间的能够 将二者导通或断幵的触控幵关， 其中所述触控电容的压差能够传递到所述触控感 测线。
本发明对现有的按压电容式内置触控装置进行了改进， 解决了目前此类装置 存在的缺点， 提高了像素开口率， 使按压电容式内置触控技术可以应用到大尺寸 面板上， 并 简化了触控驱动电路。
优选地， 所述触控电容包括位于阵列基板的相应的所述像素子单元中的导电 垫以及位于所述彩膜基板的与所述导电垫相对的位置处的导电元件。
优选地， 所述导电元件连接到用于提供基准电压的公共线上。
优选地， 所述触控感测线连接到能够检测到压差变化信号的放大器。
在导电垫和导电元件之间形成有电压差， 且该电压差与触控电容的电容量有 关。 由于触控感劉线连接到能够检劉到压差变化信号的放大器， 因此根据本发明 的装置能够有效、 精准地检测到压差或电容发生变化的位置处， 完成触控过程。
优选地， 所述触控开关包括第二薄膜晶体管， 所述第二薄膜晶体管包括与所 述第一扫描线连接的栅极、 与所述触控感测线连接的源极、 以及与所述导电垫连 接的漏极。
优选地， 所述触控感测线与所述数据线平行， 和 /或所述触控感测线与所述数 据线在同一层中制成。 触控感测线与数据线的平行布置有利于阵列基板的走线布 置， 省了走线空间， 同时最大限度降低了走线之间的交叉点， 有效降低了可能 发生在交叉点处的电路故障的概率。 而在同一层中制造触控感测线和数据线， 简 化了制诈工艺， 节省了制作材料， 同时降低了大规模生产的成本， 相对于现有技 术带来了显著的进歩。
优选地， 所述第二薄膜晶体管的源极连接到所述触控感测线的与所述第一扫 描线相交叉的区域处。 这减小了对光线的阻挡， 增大了开口区域和幵口率。 加强 了液晶面板的显示效果和光能的利用率。
优选地， 所述触控感测线与所述第一扫描线平行， 和 /或所述触控感测线与所 述第一扫描线在同一层中制成。 触控感测线与第一扫描线的平行布置有利于阵列 基板的走线布置， 节省了走线空间， 同时最大限度降低了走线之间的交叉点， 有 效降低了可能发生在交叉点处的电路故障的概率。 而在同一层中刺造触控感测线 和第一扫描线， 简化了制作工艺， 节省了制作材料， 同时降低了大规模生产的成 本， 相对干现有技术带来了显著的进歩。
优选地， 所述第二薄膜晶体管的源极连接到连接线的一端， 所述连接线与所 述数据线在同一层中制成， 所述连接线的另一端通过过孔连通到所述触控感测 线。
优选地， 所述第二薄膜晶体管的有源层与所述第一薄膜晶体管的有源层在同 一层中制成。 如此地， 简化了制作工艺， 节省了制作材料， 同时降低了大规模生 产的成本， 相对于现有技术带来了显著的进歩。
优选地， 沿所述液晶面板的法向方向观测， 所述第二薄膜晶体管、 所述导电 垫和所述导电元件的位置与所述第一扫描线的位置至少部分重叠。 以此方式， 减 小了对光线的阻挡， 增大了开口区域和开口率。 加强了液晶面板的显示效果。
由于基准电压会通过触控电容与触控幵关传递到触控感测线上， 久而久之这 种漏电有可能会使得触控电容两端的压差为零， 触控就会失灵。 为了避免上述问 题, 优选地， 所述装置还包括与所述第一扫描线平行并在同一层中制成的第二扫 描线， 所述第二扫描线连接到第三薄膜晶体管的栅极， 且所述第三薄膜晶体管的 源极连接到所述触控感测线， 用于释放电荷。
本发明对现有的按压电容式内置触控装置进行了改进， 解决了目前此类装置 存在的缺点， 提高了像素幵口率， 使按压电容式内置触控技术可以应用到大尺寸 面板上， 并 筒化了触控驱动电路。 上述技术特征可以各种适合的方式组合或由等效的技术特征来替代， 只要能 够达到本发明的目的。 附图说明
在下文中将基于仅为非限定性的实施例并参考^图来对本发明进行更详细的 描述。 其中；
图 1显示了现有技术中的光敏式触控技术；
图 2显示了现有技术中的电容式触控技术；
图 3显示了现有技术中的电阻式触控技术；
图 4显示了根据本发明的内置触控的液晶显示装置的结构示意图； 图 5 显示了根据本发明的内置触控的液晶显示装置沿面板法向方^的剖视 图；
图 6显示了根据本发明的内置触控的液晶显示装置的电路图；
图 7显示了根据本发明的内置触控的液晶显示装置的第一实施例的示意图； 图 8显示了根据本发明的第一实施倒的扫描信号的 序示意图；
图 9显示了根据本发明的内置触控的液晶显示装置的第二实施例的示意图； 图 10显示了根据本发明的第二实施^的扫描信号的时序示意图。
在同一附图中， 相同的构件由相同的對图标记标示。 對图并未按照实际的比 例绘制。 具体实施方式
下面将参照付图来详细地介绍本发明。
首先参照图 5。 图 5显示了根据本发明的内置触控的液晶显示装置沿面板法 向方向的剖视图。
由图 5可见， 根据本发明的内置触控的液晶显示装置包括阵列基板 22、 与所 述阵列基板 22相对的彩膜基板 21、 以及位于阵列基板 22和彩膜基板 21之间的 液晶层 24。
图 4显示了根据本发明的内置触控的液晶显示装置的结构示意图。
参照图 4， 可迸一步看到， 阵列基板 22上设有纵横交叉的第一扫描线 12和 数据线 11 , 第一扫描线 12和数据线 i i交叉限定多个像素单元。一个像素单元至 少包括 Ξ:个像素子单元 (R、 G、 B), 分别对应于液晶显示面板的 基色红色、 绿 色和蓝色。 每个像素子单元均设有第一薄膜晶体管】6和像素电极。
在根据本发明的液晶显示装置中， 设置有触控感测线 13。 触控感测线 13连 接到能够检测到压差变化信号的放大器。
同时， 在至少一部分像素单元中， 优选地在全部像素单元中， 对应于至少一 个像素子单元设置有触控电容 23 (图 5中详细显示） 以及位于触控电容 23和触 控感测线 13之间的能够将二者导通或断开的触控开关 14。其中触控电容 23的压 差能够传递到触控感测线 13。
在图 4所示的例子中， 触控电容 23、 触控感测线 13和触控开关 14均对应于 蓝色像素子单元而设置。 然而， 这并非限定性的， 触控电容 23 和触控开关也可 以对应于绿色像素子单元或红色像素子单元而设置。 并旦对于每个液晶像素单元 而言， 与其相对应的触控电容 23、触控感测线 13以及触控开关 14的数目也并非 限定为 ·个， 可以根据对触控分辨率的需求而设定为适当的数量。
再次参照图 5 , 触控电容 23包括位于阵列基板 22的相应的像素子单元中的 导电垫 15 以及位于所述彩膜基板 21的与导电垫 15相对的位置处的导电元件。 导电元件连接到用于提供基准电压的公共线上。
图 6显示了根据本发明的內置触控的液晶显示装置的电路图。 参照图 6， 可 看出在导电垫 15和导电元件之间形成有电压差， 且该电压差与触控电容 23的电 容量有关。 由于触控感测线 13 连接到能够检测到压差变化信号的放大器， 因此 根据本发明的装置能够有效、 精准地检溯到压差或电容发生变化的位置处， 完成 触控过程。
再次参照图 4, 触控开关 14包括第二薄膜晶体管， 第二薄膜晶体管包括与第 扫描线 12连接的櫥极、 与触控感测线 13连接的源极、 以及与导电垫 15连接 的漏极 （在图 7中 ]¾标号 37标示） 。
图 7显示了根据本发明的内置触控的液晶显示装置的第一实施飼的示意图， 图 8显示了根据本发明的第一实施倒的扫描信号的时序示意图。
在第一实施例中， 触控感测线 34与数据线 32平行。 优选地， 触控感测线 34 与数据线 32在同一层中制成。 触控感测线 34与数据线 32的平行布置有利于阵 列基板的走线布置， 节省了走线空间， 同^最大限度降低了走线之间的交叉点， 有效降低了可能发生在交叉点处的电路故障的概率。 而在同一层中制造触控感測 线 34和数据线 32, 简化了制作工艺， 节省了制作材料， 同时降低了大规模生产 的成本， 相对于现有技术带来了显著的进步。
由图 7可看出，第二薄膜晶体管的源极连接到触控感测线 34的与第 ·扫描线 30相交叉的区域处。 这减小了对光线的阻挡， 增大了幵口区域和开口率。 加强了 液晶面板的显示效果和光能的利 ¾率。
优选地， 第二薄膜晶体管的有源层 35与第一薄膜晶体管的有源层 31在同一 层中制成。 如此地， 简化了制作工艺， 节省了制作材料， 同时降低了大规模生产 的成本， 相对于现有技术带来了显著的进步。
参照图 7, -可以看出， 沿该液晶面板的法向方向观测， 第二薄膜晶体管、 导 电垫和导电元件的位置 36与第一扫描线 30的位置至少部分重叠。 以此方式， 减 小了对光线的阻挡， 增大了开口区域和开口率。 加强了液晶面板的显示效果。
参照图 8, 如果有触控动作发生， 触控电容 23的电容值就会发生改变， 导电 元件与导电垫】5之间的压差改变就会通过触控幵关 14传递到触控感应线上进而 被放大器检测到， 对触控进行定位。
图 9显示了根据本发明的内置触控的液晶显示装置的第二实施例的示意图， 图 10显示了根据本发明的第二实施例的扫描信号的^序示意。
在第二实施倒中， 触控感测线 47与第一扫描线 41平行。 优选地， 触控感测 线 47与第一扫描线 41在同一层中制成。 触控感测线 47与第一扫描线 41的平行 布置有利于阵列基板的走线布置， 节省了走线空间， 同时最大限度降低了走线之 间的交叉点， 有效降低了可能发生在交叉点处的电路故障的概率。 而在同一层中 制造触控感测线 47和第一扫描线 4】， 简化了制作工艺， 节省了制作材料， 同时 降低了大规模生产的成本， 相对于现有技术带来了显著的进步。
进 ·歩地， 参照图 9, 第二薄膜晶体管的源极连接到连接线 48的一端， 连接 线 48与数据线 43在同 ·层中制成。 由干连接线 48和触控感测线 47之间存在中 间层 49， 连接线 48的另 ·端通过过孔 40连通到触控感测线 47。
优选地， 第二薄膜晶体管的有源层 46与第一薄膜晶体管的有源层 42在同一 层中制成。 如此地， 简化了制作工艺， 节省了制作材料， 同时降低了大规模生产 的成本， 相对于现有技术带来了显著的进步。
参照图 9, -可以看出， 沿该液晶面板的法向方向观测， 第二薄膜晶体管、 导 电垫和导电元件的位置 45与第一扫描线 41的位置至少部分重叠。 以此方式， 减 小了对光线的阻挡， 增大了开口区域和开口率。 加强了液晶面板的显示效果。 参照图 10, 如果有触控动诈发生， 触控电容 23 的电容值就会发生改变， 导 电元件与导电垫 15之间的压差改变就会通过触控开关 14传递到触控感测线上， 进而被放大器检测到， 对触控进行定位。
由于基准电压会通过触控电容 23与触控开关 14传递到触控感测线 13上，久 而久之这种漏电有可能会使得触控电容 23 两端的压差为零， 触控就会失灵。 为 了避免上述问题， 在一个优选的实施 ^中， 根据本发明的装置还包括与第一扫描 线 12 平行并在同一层中制成的第二扫描线， 第二扫描线连接到第三薄膜晶体管 的栅极， 且第三薄膜晶体管的源极连接到触控感测线 13。 此结构 ^于释放电荷， 保持触控长久有效， 并延长了装置寿命， 降低了线路受损的可能性。
导电元件的材料可以为聚苯乙烯 (:PS)。
本发明对现有的按压电容式内置触控装置进行了改进， 解决了目前此类装置 存在的缺点， 提高了像素开口率， 使按压电容式内置触控技术可以应用到大尺寸 面板上， 并旦筒化了触控驱动电路。
虽然己经参考优选实施例对本发明进行了描述， 但在不脱离本发明的范围的 情况下， 可以对其进行各种改进并且可以用等效物替换其中的部件。 本发明并不 局限于文中公开的特定实施例， 而是包括落入权利要求的范围内的所有技术方 案。

Claims

权利要求
1. 内置触控的液晶显示装置，包括阵列基板 (22)、与所述阵列基板 (22)相对的 彩膜基板 (21)、 以及位于所述阵列基板 (22)和所述彩膜基板 (21)之间的液晶层 (24), 所述阵列基板 (22)上设有纵横交叉的第一扫描线 (12)和数据线 (11), 所述第一扫描 线 (12)和数据线 (11)交叉限定多个像素单元，所述像素单元至少包括三个像素子单 元 (R、 G、 B), 每个像素子单元均设有第一薄膜晶体管 (16)和像素电极 (33、 44), 其中， 所述装置设置有触控感测线 (13), 且在至少一部分像素单元中， 对应于至 少一个所述像素子单元设置有触控电容 (23)以及位于所述触控电容 (23)和所述触 控感测线 (13)之间的能够将二者导通或断开的触控幵关 (14)， 其中所述触控电容
(23)的压差能够传递到所述触控感测线 (13)。
2. 根据权利要求 1 所述的装置， 其中， 所述触控电容 (23)包括位于阵列基板 (22)的相应的所述像素子单元中的导电垫 (15)以及位于所述彩膜基板 (2i)的与所 述导电垫 (15)相对的位置处的导电元件。
3. 根据权利要求 2所述的装置， 其中， 所述导电元件连接到用于提供基准电 压的公共线上。
4. 根据权利要求 2所述的装置， 其中， 所述触控感测线 (13)连接到能够检测 到压差变化信号的放大器。
5. 根据权利要求 2所述的装置， 其中， 所述触控开关 (】4)包括第二薄膜晶体 管， 所述第二薄膜晶体管包括与所述第一扫描线 (30、 41)连接的栅极、 与所述触 控感测线 (34、 47)连接的源极、 以及与所述导电垫 (15)连接的漏极。
6. 根据权利要求 3所述的装置， 其中， 所述触控幵关 (14)包括第二薄膜晶体 管， 所述第二薄膜晶体管包括与所述第一扫描线 (30、 41)连接的栅极、 与所述触 控感测线 (34、 47)连接的源极、 以及与所述导电垫 (15)连接的漏极。
7. 根据权利要求 4所述的装置， 其中， 所述触控开关 (14)包括第二薄膜晶体 管， 所述第二薄膜晶体管包括与所述第一扫描线 (30、 41)连接的栅极、 与所述触 控感测线 (34、 47)连接的源极、 以及与所述导电垫 (15)连接的漏极。
8. 根据权利要求 5所述的装置，其中，所述触控感測线 (34)与所述数据线 (32) 平行， 和 /或所述触控感测线 (34)与所述数据线 (32)在同一层中制成。
9. 根据权利要求 8所述的装置， 其中， 所述第二薄膜晶体管的源极连接到所 述触控感测线 (34)的与所述第一扫描线 (30)相交叉的区域处。
10. 根据权利要求 5所述的装置， 其中， 所述触控感测线 (47)与所述第一扫描 线 (41)平行， 和 /或所述触控感测线 (47)与所述第 ·扫描线 (4】)在同 ·层中制成。
11. 根据权利要求 6所述的装置， 其中， 所述触控感测线 (47)与所述第一扫描 线 (41)平行， 和 /或所述触控感测线 (47)与所述第一扫描线 (41)在同一层中制成。
12. 根据权利要求 10所述的装置， 其中， 所述第二薄膜晶体管的源极连接到 连接线 (48)的一端， 所述连接线 (48)与所述数据线 (43)在同一层中制成， 所述连接 线 (48)的另一端通过过孔 (40)连通到所述触控感测线 (47)。
13. 根据权利要求 5所述的装置， 其中， 所述第二薄膜晶体管的有源层 (35、 46)与所述第一薄膜晶体管的有源层 (31、 42)在同一层中制成。
14. 根据权利要求 2 所述的装置， 其中， 沿所述液晶面板的法向方向观测， 所述第二薄膜晶体管、 所述导电垫 (15)和所述导电元件的位置与所述第一扫描线 (12)的位置至少部分重叠。
】5. 根据权利要求 3 所述的装置， 其中， 沿所述液晶面板的法向方向观测， 所述第二薄膜晶体管、 所述导电垫 (15)和所述导电元件的位置与所述第一扫描线 (12)的位置至少部分重叠。
16. 根据权利要求 4所述的装置， 其中， 沿所述液晶面板的法向方向观测， 所述第二薄膜晶体管、 所述导电垫 ί15)和所述导电元件的位置与所述第一扫描线 (12)的位置至少部分重叠。
17. 根据权利要求 1所述的装置，其中，所述装置还包括与所述第一扫描线 (12) 平行并在同一层中制成的第二扫描线， 所述第二扫描线连接到第三薄膜晶体管的 櫥极， 且所述第三薄膜晶体管的源极连接到所述触控感测线 (13), 用于释放电荷。
18. 根据权利要求 2所述的装置,其中，所述装置还包括与所述第一扫描线 (】2) 平行并在同一层中制成的第二扫描线， 所述第二扫描线连接到第 薄膜晶体管的 栅极， 且所述第 薄膜晶体管的源极连接到所述触控感测线 (13)， 用于释放电荷。
19. 根据权利要求 3所述的装置,其中，所述装置还包括与所述第一扫描线 (12) 平行并在同一层中制成的第二扫描线， 所述第二扫描线连接到第三薄膜晶体管的 栅极， 且所述第三薄膜晶体管的源极连接到所述触控感测线 (i3)， 用于释放电荷。
20. 根据权利要求 4所述的装置，其中，所述装置还包括与所述第一扫描线 (12) 平行并在同一层中制成的第二扫描线， 所述第二扫描线连接到第三薄膜晶体管的 櫥极， 且所述第三薄膜晶体管的源极连接到所述触控感测线 (13), 用于释放电荷。
PCT/CN2014/071269 2013-12-31 2014-01-23 内置触控的液晶显示装置 Ceased WO2015100826A1 (zh)

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