WO2011148690A1 - Panneau d'affichage à cristaux liquides - Google Patents

Panneau d'affichage à cristaux liquides Download PDF

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Publication number
WO2011148690A1
WO2011148690A1 PCT/JP2011/055259 JP2011055259W WO2011148690A1 WO 2011148690 A1 WO2011148690 A1 WO 2011148690A1 JP 2011055259 W JP2011055259 W JP 2011055259W WO 2011148690 A1 WO2011148690 A1 WO 2011148690A1
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WIPO (PCT)
Prior art keywords
switch
substrate
electrode
liquid crystal
display panel
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PCT/JP2011/055259
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English (en)
Japanese (ja)
Inventor
山岸慎治
木田和寿
阿比留学
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シャープ株式会社
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Publication of WO2011148690A1 publication Critical patent/WO2011148690A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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; CALCULATING OR 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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • 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
    • G02F1/1343—Electrodes

Definitions

  • the present invention relates to a liquid crystal display panel having a touch sensor function for detecting position information on a display screen.
  • liquid crystal display panels have been widely used in various devices such as personal computers, mobile phones, PDAs and game machines.
  • a liquid crystal display panel that detects positional information on a display screen by arranging a touch panel on the liquid crystal display panel is also known.
  • a touch panel position detection method for example, a resistance film method and a capacitance method are generally known.
  • the resistive film type touch panel has a substrate and a film facing each other through a slight gap.
  • Transparent conductive films are formed on surfaces of the substrate and the film that face each other.
  • Such a touch panel is attached to the display panel so that the substrate is on the display panel side. And when the said film is pressed with a finger, a touch pen, etc., a film will bend to a board
  • a cylindrical portion is provided so as to connect the pixel electrode of the active substrate and the common electrode formed on the color filter layer of the counter substrate.
  • the cylindrical portion has a hollow cylindrical shape having a height equal to a gap (that is, a cell gap) between the active substrate and the counter substrate, and is made of an elastically deformable material. Inside the cylindrical portion, a conductive material is injected leaving a slight gap on the counter substrate side (upper end side).
  • the conductive material is electrically connected to the pixel electrode.
  • the cylindrical portion is compressed and deformed, the upper end of the conductive material in the inside comes into contact with the common electrode of the counter substrate, and the common electrode and the pixel electrode are electrically connected. By detecting this, the touch position can be detected.
  • the conventional liquid crystal display panel with an in-cell touch sensor function described in Patent Document 1 has a structure in which the touch pressure applied to the counter substrate is supported by the cylindrical portion, and thus the touch pressure is repeatedly applied. And the cylindrical part may be destroyed.
  • the color filter layer in which the cylindrical part is formed is generally made of a resin material and has low mechanical strength, so the color filter layer may be destroyed in the vicinity of the boundary between the cylindrical part and the color filter layer. It was.
  • An object of the present invention is to solve the above-mentioned conventional problems and to provide a liquid crystal display panel with an in-cell type touch sensor function that has improved durability against repeated pressing.
  • the liquid crystal display panel of the present invention includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer between the first substrate and the second substrate, the first substrate or the second substrate.
  • a touch switch that is electrically conductive when the substrate is pressed and a distance between the first substrate and the second substrate is reduced.
  • the touch switch includes a switch electrode formed on the second substrate, a plurality of switch protrusions formed on the first substrate protruding toward one common switch electrode, and tips of the plurality of switch protrusions And electrodes that are electrically connected to each other.
  • a plurality of switch protrusions face one common switch electrode, and the electrodes formed at the tips of the plurality of switch protrusions are electrically connected to each other.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display panel according to Embodiment 1 of the present invention.
  • FIG. 2 is a plan view schematically showing the color filter layer formed on the counter substrate constituting the liquid crystal display panel according to Embodiment 1 of the present invention.
  • FIG. 3 is a plan view schematically showing a plurality of pixels formed on the active substrate constituting the liquid crystal display panel according to Embodiment 1 of the present invention.
  • FIG. 4 is an enlarged plan view showing one pixel formed on the active substrate in the first embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of the liquid crystal display panel according to Embodiment 1 of the present invention taken along the line VV in FIG. FIG.
  • FIG. 6 is a circuit diagram of one pixel including a TFT and a touch switch of the liquid crystal display panel according to Embodiment 1 of the present invention.
  • 7A to 7E are cross-sectional views showing one manufacturing process of the counter substrate constituting the liquid crystal display panel according to Embodiment 1 of the present invention.
  • FIG. 8 is a schematic cross-sectional view of a liquid crystal display panel according to a comparative example.
  • FIG. 9 is an enlarged cross-sectional view of a touch switch of a liquid crystal display panel according to a comparative example.
  • FIG. 10A is an enlarged cross-sectional view of a touch switch of a liquid crystal display panel according to Embodiment 2 of the present invention.
  • FIG. 10B is a cross-sectional view taken along line XB-XB in FIG. 10A.
  • FIG. 11 is an enlarged cross-sectional view of another touch switch of the liquid crystal display panel according to Embodiment 2 of the present invention.
  • FIG. 12A is a schematic plan view showing an arrangement of color filter layers and touch switches in a liquid crystal display panel according to Embodiment 3 of the present invention.
  • 12B is a cross-sectional view of the liquid crystal display panel taken along the line XIIB-XIIB in FIG. 12A.
  • 12C is a cross-sectional view of the liquid crystal display panel taken along the line XIIC-XIIC in FIG. 12A.
  • FIG. 13 is a schematic plan view showing another arrangement of the color filter layer and the touch switch in the liquid crystal display panel according to Embodiment 3 of the present invention.
  • FIG. 14 is a schematic plan view showing still another arrangement of the color filter layer and the touch switch in the liquid crystal display panel according to Embodiment 3 of the present invention.
  • the switch electrode is preferably formed on a protrusion having a convex curved surface formed on the second substrate.
  • the first substrate is a counter substrate on which a color filter layer is formed
  • the second substrate is an active substrate on which a plurality of pixel electrodes and a plurality of TFTs for driving the plurality of pixel electrodes are formed. preferable.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display panel 1 according to Embodiment 1 of the present invention.
  • FIG. 2 is a plan view schematically showing the color filter layer 26 formed on the counter substrate 11 constituting the liquid crystal display panel 1.
  • FIG. 3 is a plan view schematically showing a plurality of pixels 5 formed on the active substrate 12 constituting the liquid crystal display panel 1.
  • FIG. 4 is an enlarged plan view showing one pixel 5 formed on the active substrate 12.
  • FIG. 5 is a cross-sectional view of the liquid crystal display panel 1 taken along the line VV in FIG.
  • FIG. 6 is a circuit diagram of one pixel including the TFT 16 and the touch switch 50 of the liquid crystal display panel 1.
  • the liquid crystal display panel 1 of Embodiment 1 is, for example, a transmissive liquid crystal display panel that performs at least transmissive display.
  • the liquid crystal display panel 1 includes a counter substrate 11 as a first substrate, an active substrate 12 as a second substrate facing the counter substrate 11, and the counter substrate 11 and the active substrate 12. And a liquid crystal layer 10 therebetween.
  • An illuminating device (backlight) for illuminating the liquid crystal display panel 1 can be arranged on the side of the active substrate 12 opposite to the liquid crystal layer 10 to constitute a liquid crystal display device.
  • the liquid crystal display panel 1 has, for example, a rectangular display area and a frame area that is a non-display area formed in a frame shape around the display area.
  • the counter substrate 11 is formed with a color filter layer 26 and a switch protrusion 51
  • the active substrate 12 is formed with a plurality of pixel electrodes 15 and a switch electrode 52.
  • three switch protrusions 51 face one switch electrode 52.
  • An electrode (common electrode 27 in FIG. 5) is formed at the tip of the switch protrusion 51.
  • the switch protrusion 51, the electrode formed at the tip thereof, and the switch electrode 52 constitute a touch switch 50.
  • the counter substrate 11 includes a glass substrate 25 as an insulating translucent substrate and a color filter layer 26 formed on the surface of the glass substrate 25 facing the active substrate 12.
  • the glass substrate 25 is formed with a thickness of 0.7 mm or less, for example.
  • a polarizing plate (not shown) is attached to the surface of the glass substrate 25 opposite to the active substrate 12.
  • FIG. 2 is a plan view of the color filter layer 26 seen through from the glass substrate 25 side.
  • the color filter layer 26 includes colored layers 26R, 26G, and 26B, and a light-shielding layer (black matrix) 26M having a light shielding property, disposed between the adjacent colored layers 26R, 26G, and 26B.
  • the colored layer 26R selectively transmits light in the red wavelength band
  • the colored layer 26G selectively transmits light in the green wavelength band
  • the colored layer 26B selectively transmits light in the blue wavelength band.
  • the colored layers 26R, 26G, and 26B are arranged in an array in the vertical and horizontal directions within the display area of the glass substrate 25.
  • the coloring layers 26R, 26G, and 26B and the light shielding layer 26M are not particularly limited, and can be formed by a known method using a known material.
  • a spacer 33 and a switch protrusion 51 protruding toward the active substrate 12 are formed on the counter substrate 11.
  • the spacer 33 is a so-called photo spacer, and defines an interval (so-called cell gap) between the counter substrate 11 and the active substrate 12.
  • both the spacer 33 and the switch protrusion 51 are formed on the light shielding layer 26M.
  • a common electrode 27 (see FIG. 5) made of a transparent conductive material such as ITO (Indium) TinideOxide) is continuously formed so as to cover the color filter layer 26 and the switch protrusion 51. Further, an alignment film (not shown) made of polyimide or the like is formed so as to cover the color filter layer 26, the spacer 33, and the switch protrusion 51 (excluding the tip of the switch protrusion 51).
  • the tip of the spacer 33 is in contact with the surface of the active substrate 12.
  • the tip of the switch protrusion 51 is separated from the surface of the active substrate 12 when the counter substrate 11 is not pressed.
  • the height of the spacer 33 (that is, the cell gap) can be 3 ⁇ m, for example, and the height of the switch protrusion 51 can be 2.5 ⁇ m, for example.
  • the active substrate 12 is a so-called active matrix substrate, and has a glass substrate 35 as an insulating translucent substrate.
  • the glass substrate 35 is formed to a thickness of 0.7 mm or less, for example.
  • a plurality of gate wirings 13 parallel to each other and a plurality of source wirings 14 parallel to each other are formed on the glass substrate 35.
  • the plurality of gate lines 13 and the plurality of source lines 14 intersect with each other to form a lattice pattern.
  • a pixel 5 is formed in each rectangular region partitioned by a plurality of gate wirings 13 and a plurality of source wirings 14.
  • a pixel electrode 15 facing the common electrode formed on the counter substrate 11 and a TFT (Thin-FilmTransistor) 16 that is a switching element for switching and driving the voltage of the pixel electrode 15 are formed.
  • the pixel electrode 15 is formed at a position facing the colored layers 26R, 26G, and 26B of the counter substrate 11 on a one-to-one basis.
  • the TFT 16 is disposed in the upper right corner portion of the pixel 5 and connected to the gate wiring 13 and the source wiring 14.
  • the TFT 16 includes a gate electrode 17, a source electrode 18, and a drain electrode 19, and a semiconductor layer 34 is interposed between the gate electrode 17, the source electrode 18, and the drain electrode 19.
  • the gate electrode 17 is connected to the gate wiring 13
  • the source electrode 18 is connected to the source wiring 14, and the drain electrode 19 is connected to the pixel electrode 15.
  • the drain electrode 19 is covered with an interlayer insulating film (not shown), and as shown in FIG. 4, a contact hole 23 is formed through the interlayer insulating film.
  • the drain electrode 19 and the pixel electrode 15 are connected via the contact hole 23.
  • Image display is performed as follows. A signal voltage is applied to the source line 14 in a state where the scanning voltage is applied to the gate electrode 17 via the gate line 13. The signal voltage is supplied to the pixel electrode 15 through the source electrode 18 and the drain electrode 19. As a result, the liquid crystal layer 10 of the pixel 5 including the pixel electrode 15 is driven according to the potential difference between the pixel electrode 15 and the common electrode. A desired image is displayed by sequentially switching (scanning) the gate wirings 13 to which the scanning voltage is applied among the plurality of gate wirings 13 (scanning).
  • a plurality of capacitor wirings 20 parallel to each other are formed in the same direction as the gate wiring 13 so as to face a substantially central portion of the pixel electrode 15.
  • An interlayer insulating film (not shown) is interposed between the capacitor wiring 20 and the pixel electrode 15, thereby forming a capacitor element 21 also called an auxiliary capacitor.
  • the capacitive element 21 is formed in each pixel 5 and has a function of maintaining the display voltage in each pixel 5 substantially constant.
  • An alignment film (not shown) made of polyimide or the like is formed on the surface of the active substrate 12 on the liquid crystal layer 10 side so as to cover the pixel electrode 15.
  • a switch electrode 52 is further formed on the active substrate 12 in a region where the pixel electrode 15 is not formed in the lower right corner portion of each pixel 5.
  • the switch electrode 52 is made of, for example, ITO and can be formed in the same process as the pixel electrode 15.
  • a detection TFT 53 for detecting the pressed position is connected to the switch electrode 52.
  • FIG. 5 is a cross-sectional view of the liquid crystal display panel 1 taken along the line VV of FIG. 4 passing through the switch electrode 52 and the detection TFT 53.
  • the detection TFT 53 includes a gate electrode 55, a source electrode 56, and a drain electrode that is the switch electrode 52.
  • a gate electrode 55 is formed on the glass substrate 35, and a gate insulating film 36 is formed so as to cover the gate electrode 55.
  • a semiconductor layer 57 is formed on the surface of the gate insulating film 36 so as to cover the gate electrode 55.
  • a source electrode 56 and a switch electrode 52 are formed so as to cover a part of the surface of the semiconductor layer 57.
  • the source electrode 56 and the semiconductor layer 57 are covered with an interlayer insulating film 37.
  • the interlayer insulating film 37 is made of, for example, a resin having translucency (preferably having transparency).
  • the upper surface of the switch electrode 52 is not covered with the interlayer insulating film 37 but exposed toward the counter substrate 11.
  • the three switch protrusions 51 described above are formed on the counter substrate 11 so as to protrude toward the common switch electrode 52.
  • the detection TFT 53 is for detecting a conduction state between the common electrode 27 formed on the surface of the switch protrusion 51 and the switch electrode 52.
  • the gate electrode 55 is connected to the detection wiring 43, and the source electrode 56 is connected to the source wiring 14.
  • a plurality of detection wirings 43 are formed on the active substrate 12 in parallel with the gate wirings 13.
  • the detection TFT 53 is used to detect the conduction state between the common electrode 27 formed on the surface of the switch protrusion 51 and the switch electrode 52 and detect the touch position.
  • the touch position detection method will be described below.
  • the above operation is performed to detect a two-dimensional position of the touch position in the display area. it can.
  • the TFT 16 and the detection TFT 53 are connected to the source wiring 14.
  • a source wiring that connects the source electrode 56 of the detection TFT 53 may be provided separately from the source wiring 14. In this case, since the touch position can be detected independently of the image display control, the detection accuracy can be improved.
  • one touch switch 50 is provided for one pixel 5, but the present invention is not limited to this.
  • one touch switch 50 may be provided for one color pixel including the red, blue, and green pixels 5.
  • one touch switch 50 may be provided for an arbitrary number of pixels 5.
  • the manufacturing method of the liquid crystal display panel 1 of the present embodiment includes a first step of creating the counter substrate 11, a second step of creating the active substrate 12, and a third step of bonding the counter substrate 11 and the active substrate 12 together. Including. Either the first step or the second step may be performed first.
  • a first step of creating the counter substrate 11 will be described with reference to FIGS. 7A to 7E.
  • a light shielding layer 26 ⁇ / b> M having a predetermined pattern is formed on the glass substrate 25.
  • the light shielding layer 26M can be formed by applying a black resin material on the glass substrate 25 and then removing the unnecessary black resin material by photolithography.
  • colored layers 26R, 26G, and 26B are formed in the non-formation region of the light shielding layer 26M on the glass substrate 25.
  • the colored layers 26R, 26G, and 26B can be formed as follows. First, a color resist including a coloring layer material is applied on the glass substrate 25. Next, the color resist is cured and insolubilized by irradiating with ultraviolet rays through a photomask having openings of a predetermined pattern. Next, an uncured unnecessary color resist is removed with a developer. Finally, the color resist is baked and cured. The above steps are performed for the three color layers of red, green, and blue to form the color layers 26R, 26G, and 26B.
  • a switch protrusion 51 is formed on the light shielding layer 26M.
  • the switch protrusion 51 can be formed as follows. First, a resist for the switch protrusion 51 is applied on the glass substrate 25. Next, the resist is cured by being irradiated with ultraviolet rays through a photomask having openings of a predetermined pattern, and insolubilized. Next, the uncured unnecessary resist is removed with a developer. Finally, the resist is baked and cured. Thus, the switch protrusion 51 can be formed.
  • the switch protrusion 51 is formed at the same time as the process for forming the color layers 26R, 26G, and 26B (FIG. 7B). Good. In that case, a halftone mask is preferably used as the photomask.
  • the common electrode 27 is formed so as to cover the color filter layer 26 and the switch protrusion 51.
  • the common electrode 27 can be obtained by forming an ITO thin film by sputtering.
  • a spacer 33 is formed on the light shielding layer 26M.
  • the spacer 33 can be formed as follows. First, a resist for the spacer 33 is applied on the glass substrate 25. Next, the resist is cured by being irradiated with ultraviolet rays through a photomask having openings of a predetermined pattern, and insolubilized. Next, the uncured unnecessary resist is removed with a developer. Finally, the resist is baked and cured. Thus, the spacer 33 can be formed.
  • the common electrode 27 formed at the tip of the switch protrusion 51 is not covered with the alignment film.
  • a method for realizing this is not particularly limited, but can be as follows, for example.
  • the first method is as follows. That is, an alignment film is formed on the entire surface of the counter substrate 11, then a resist is formed on the alignment film, then the resist at the tip of the switch protrusion 51 is removed, and then the exposed alignment film on the switch protrusion 51 is removed. The resist is removed by ashing and finally the resist is washed away.
  • the tip of the switch protrusion 51 is formed into a convex curved surface shape (for example, a round dome shape) in the same manner as the resin base material 77 having a convex curved surface shape according to the second embodiment described later.
  • the surface shape of the common electrode 27 formed thereon is also a convex curved surface shape reflecting the tip shape of the switch protrusion 51.
  • the alignment film material solution is applied thereon, the alignment film material solution is repelled and not applied at the top of the convex curved surface and in the vicinity thereof. Thereafter, when the alignment film material is cured by baking, the common electrode 27 can be exposed at the tip of the switch protrusion 51.
  • This second method is advantageous in that the number of steps is small because the step of removing the alignment film in a predetermined region after forming the alignment film, which is necessary in the first method, is unnecessary.
  • the above method for preventing the common electrode 27 at the tip of the switch protrusion 51 from being covered with the alignment film is merely an example, and the present invention may use a method other than the above.
  • the second step of creating the active substrate 12 will be described.
  • the TFT 16, the detection TFT 53, the pixel electrode 15, the switch electrode 52, and the like are formed by a known method using photolithography.
  • the detection TFT 53 can be formed simultaneously in the same process as the TFT 16. Thereafter, an alignment film is formed on the entire surface of the active substrate 12.
  • the switch electrode 52 is not covered with the alignment film.
  • a method for realizing this is not particularly limited, but can be as follows, for example. That is, an alignment film is formed on the entire surface of the active substrate 12, then a resist is formed on the alignment film, then the resist on the switch electrode 52 is removed, and then the exposed alignment film on the switch electrode 52 is ashed. Finally, the resist is removed by washing.
  • the switch electrode 52 may not be covered with the alignment film by other methods.
  • the third step is performed.
  • the surface of the counter substrate 11 on which the color filter layer 26 is formed and the surface of the active substrate 12 on which the pixel electrode 15, the switch electrode 52, and the like are formed are opposed to each other. And the active substrate 12 are bonded together.
  • the liquid crystal layer 10 is sealed between the counter substrate 11 and the active substrate 12.
  • a plurality (three in the above embodiment) of switch protrusions 51 are opposed to a common switch electrode 52. Therefore, when a touch pressure is applied to the counter substrate 11, the load is distributed to the plurality of switch protrusions 51. That is, the load applied to one switch protrusion 51 becomes small. Thereby, the possibility that the switch protrusion 51 itself and the light shielding layer 26M under the switch protrusion 51 are destroyed is reduced. In addition, even if one switch protrusion 51 of the plurality of switch protrusions 51 facing one switch electrode 52 is destroyed and no longer functions due to the repeatedly applied touch pressure, the remaining switch protrusion 51 touches the switch electrode 51. The sensor function is continuously secured. As described above, in this embodiment, a liquid crystal display panel with an in-cell type touch sensor function with improved durability against repeated pressing can be realized by the distribution of the touch pressure and the redundant design.
  • three switch protrusions 51 are formed for one switch electrode 52, but the present invention is not limited to this.
  • the number of switch protrusions 51 for one common switch electrode 52 may be two or more. In general, as the number of the switch protrusions 51 with respect to one switch electrode 52 increases, the durability against repeated pressing of the touch sensor is improved.
  • the switch protrusion 51 is formed on the light shielding layer 26M, but may be formed on the colored layers 26R, 26G, and 26B.
  • the liquid crystal display panel 1 of Embodiment 1 described with reference to FIGS. 1 to 7 was created.
  • liquid crystal display panel 1 ′ shown in FIGS. 8 and 9 was prepared for comparison.
  • This liquid crystal display panel 1 ′ is different from the liquid crystal display panel 1 of the present embodiment in that one switch protrusion 51 is formed for one switch electrode 52.
  • the liquid crystal display of the present embodiment is the same. Same as panel 1.
  • a load of 2.5 N is applied to the display surface of the liquid crystal display panel 1 of the first embodiment (product of the present invention) and the liquid crystal display panel 1 ′ (conventional product) shown in FIGS. was applied repeatedly at 5 Hz to evaluate the durability of the touch sensor function. The results are shown in Table 1.
  • the touch position detection function was not impaired even after one million hits.
  • the liquid crystal display panel 2 of the second embodiment is different from the liquid crystal display panel 1 of the first embodiment in the configuration of the touch switch.
  • the liquid crystal display panel 2 of the present embodiment will be described focusing on differences from the first embodiment.
  • FIG. 10A is an enlarged cross-sectional view showing the touch switch 70 of the liquid crystal display panel 2 according to Embodiment 2 of the present invention in the same manner as FIG. 10B is a cross-sectional view taken along line XB-XB in FIG. 10A.
  • the same members as those shown in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the upper surface of the switch electrode 52 was substantially flat.
  • the switch electrode 72 constituting the touch switch 70 is formed on a resin base material 77 having a convex curved surface (for example, a substantially semi-cylindrical surface), and the surface shape of the switch electrode 72 is also the same.
  • a convex curved surface for example, a substantially semi-cylindrical surface reflecting the surface shape of the resin base material 77.
  • the resin base 77 can be formed simultaneously with the interlayer insulating film 37 by using, for example, the same resin as the interlayer insulating film 37.
  • the switch electrode 72 is connected to the drain electrode of the detection TFT 53 via a through hole (not shown) formed in the resin base material 77, for example.
  • the liquid crystal display panel 2 of the second embodiment is substantially the same as the liquid crystal display panel 1 of the first embodiment except for the above.
  • the production method of the active substrate 12 of the second embodiment is substantially the same as that of the first embodiment, but the method of forming the switch electrode 72 is different. That is, as in the first embodiment, the TFT 16 and the detection TFT 53 are formed on the glass substrate 35 by a known method using photolithography, and the TFT 16 and the detection TFT 53 are covered with a resist. Next, the resist in the boundary region between the interlayer insulating film 37 and the resin base material 77 to be formed is removed. This resist removing step can be performed simultaneously with the step of forming the contact hole 23 (see FIG. 4) for connecting the drain electrode 19 of the TFT 16 and the pixel electrode 15. Next, the active substrate 12 is heat-treated.
  • the resist is softened and deformed by heating, and the outer peripheral edge thereof is gently rounded as shown in FIGS. 10A and 10B, so that the interlayer insulating film 37 and the resin base material 77 are formed.
  • the switch electrode 72 is formed on the resin base material 77.
  • the switch electrode 72 can be formed simultaneously with the pixel electrode 15 by forming a thin film of ITO, for example, using a sputtering method.
  • the connection between the switch electrode 72 and the drain electrode of the detection TFT 53 can be made, for example, through a through hole (not shown) formed in the resin base material 77.
  • an alignment film material solution is applied to the entire surface of the active substrate 12.
  • the alignment film material solution is repelled at the top of the convex curved surface of the switch electrode 72 and in the vicinity thereof and is not applied. Thereafter, baking is performed to cure the alignment film material. Since the alignment film material solution is not applied, the tip of the switch electrode 72 is exposed without being covered with the alignment film.
  • the method of creating the counter substrate 11 is the same as that of the first embodiment.
  • the active substrate 12 and the counter substrate 11 obtained as described above are bonded in the same manner as in the first embodiment, and the liquid crystal layer 10 is encapsulated to obtain the liquid crystal display panel 2 of the present embodiment.
  • the switch electrode 72 is formed on the convex curved surface of the resin base material 77, the surface shape of the switch electrode 72 is also a convex curved surface. Thereafter, if an alignment film is formed on the entire surface of the active substrate 12 in the same manner as a normal alignment film forming method, the tip of the switch electrode 72 can be exposed without being covered with the alignment film as described above.
  • a process of removing the alignment film on the switch electrode 52 after forming the alignment film is necessary.
  • the process of removing this alignment film is unnecessary. Therefore, the method for forming the alignment film on the active substrate 12 is simplified.
  • the top of the switch electrode 72 can be reliably exposed by such a simple method, the contact stability between the switch electrode 72 and the common electrode 27 formed at the tip of the switch protrusion 51 facing the switch electrode 72 is stable. Improves the reliability of the touch sensor.
  • a step of removing the resist in the boundary region between the interlayer insulating film 37 and the resin base material 77 is necessary. This is the contact hole 23 necessary in the first embodiment. (See FIG. 4).
  • the switch electrode 72 can be formed at the same time as the pixel electrode 15 is formed. Therefore, compared with Embodiment 1, the process newly required in this embodiment is only a process of performing heat treatment so that the surface of the resin base material 77 is rounded. Therefore, as a whole, the manufacturing process of the active substrate 12 can be simplified and the cost can be reduced as compared with the first embodiment.
  • a plurality of switch protrusions 51 are opposed to a common switch electrode 72. Therefore, as in the first embodiment, it is possible to realize a liquid crystal display panel with an in-cell type touch sensor function with improved durability against repeated pressing by distributing the touch pressure and using a redundant design.
  • one bowl-shaped resin base material 77 that is opposed to the three switch protrusions 51 and that is continuous in the arrangement direction of the three switch protrusions 51 is formed.
  • the present invention is not limited to this.
  • three resin bases 77 may be formed so as to face the three switch protrusions 51.
  • the surface of each resin substrate 77 has a gentle convex curved surface (for example, a substantially spherical surface).
  • the switch electrode 72 is continuously formed on the three resin base materials 77.
  • the resin base material 77 By forming the resin base material 77 independently so as to face the switch protrusions 51 in this way, the radius of curvature of the tip of each resin base material 77 is reduced in any direction.
  • the switch electrode 72 is less likely to adhere to the top of the convex curved surface and the vicinity thereof. Accordingly, the contact stability between the switch electrode 72 and the common electrode 27 formed at the tip of the switch protrusion 51 facing the switch electrode 72 is further improved, and the reliability of the touch sensor is further increased.
  • the liquid crystal display panel 3 of the third embodiment is different from the liquid crystal display panel 2 of the second embodiment in the configuration and arrangement of touch switches.
  • the liquid crystal display panel 3 of the present embodiment will be described focusing on differences from the second embodiment.
  • FIG. 12A is a schematic plan view showing the arrangement of the color filter layer and the touch switch 80 when the liquid crystal display panel 3 according to Embodiment 3 of the present invention is viewed from the counter substrate side.
  • 12B is a cross-sectional view of the liquid crystal display panel 3 taken along line XIIB-XIIB in FIG. 12A
  • FIG. 12C is a cross-sectional view of the liquid crystal display panel 3 taken along line XIIC-XIIC in FIG.
  • the same members as those shown in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
  • one touch switch 70 is formed for one pixel.
  • one touch switch 80 is formed for six pixels.
  • one detection TFT is arranged for one touch switch 80.
  • one touch switch 80 is formed for six pixels.
  • the present invention is not limited to this, and the number of pixels for one touch switch 80 may be more or less than six. Also good.
  • the switch electrode 82 constituting the touch switch 80 has a convex curved surface (for example, a substantially semi-cylindrical surface) like the switch electrode 72 shown in FIGS. 10A and 10B of the second embodiment. It is formed on the resin base material 87 having. As a result, the surface shape of the switch electrode 82 also has a convex curved surface (for example, a substantially semi-cylindrical surface) reflecting the surface shape of the resin base material 87.
  • the switch electrode 82 is connected to the drain electrode of the detection TFT through a through hole (not shown) formed in the resin base material 87, for example.
  • a plurality of switch protrusions 81 are formed on the counter substrate 11 so as to face the switch electrode 82 extending in a bowl shape. 12A and 12C, 11 switch protrusions 81 are opposed to one switch electrode 82, but the number of switch protrusions 81 may be two or more, and may be more or less than 11.
  • the plurality of switch protrusions 81 are arranged side by side along the longitudinal direction of the switch electrode 82.
  • Each switch protrusion 81 is substantially plate-shaped, and its main surface is orthogonal to the longitudinal direction of the switch electrode 82. As shown in FIG.
  • the tip of the switch protrusion 81 extends linearly in a direction parallel to the counter substrate 11 and perpendicular to the longitudinal direction of the switch electrode 82 (the left-right direction in FIG. 12B). . This linear tip faces the top of the switch electrode 82.
  • the touch switch 80 of the present embodiment can be formed in the same manner as the touch switch 70 of the second embodiment.
  • a liquid crystal display panel with an in-cell touch sensor function with improved durability against repeated pressing can be realized by distributing the touch pressure and using a redundant design.
  • the switch electrode 82 Since the surface shape of the switch electrode 82 has a convex curved surface, the switch electrode 82 can be exposed without being covered with the alignment film by a simple method as in the second embodiment.
  • the switch protrusion 81 has a linear tip extending in a direction perpendicular to the longitudinal direction of the bowl-shaped switch electrode 82. This tip is opposed to the top of the switch electrode 82. Further, a plurality of switch protrusions 81 each having such a tip are arranged along the longitudinal direction of the switch electrode 82. Accordingly, an allowable range for misalignment between the counter substrate 11 and the active substrate 12 is increased. Therefore, the productivity of the liquid crystal display panel 3 is improved.
  • one touch switch 80 is arranged for a plurality of pixels. Therefore, the size of the touch switch 80 can be set without being restricted by the pixel size. For example, it is possible to easily increase the size of the touch switch 80 compared to the first and second embodiments. In such a case, the allowable range for misalignment between the counter substrate 11 and the active substrate 12 is further expanded.
  • the plurality of switch protrusions 81 need not be aligned in a line along the longitudinal direction of the switch electrode 82, as shown in FIG. 12A.
  • a plurality of substantially cylindrical switch protrusions 81 may be staggered with respect to the switch electrode 82.
  • the configuration of the switch electrode 82 in FIG. 13 is the same as that in FIGS. 12A to 12C.
  • the configuration of FIG. 13 also has the same effect as the configuration of FIGS. 12A to 12C.
  • the resin base 87 may be formed independently so as to face each of the plurality of switch protrusions 81.
  • An example is shown in FIG. A plurality of resin bases 87 are arranged in a line in the left-right direction on the paper surface of FIG. 14, and each resin base 87 extends in a bowl shape in the vertical direction.
  • the switch electrode 82 is continuously formed on the plurality of resin bases 87.
  • the allowable range for the misalignment between the counter substrate 11 and the active substrate 12 is slightly smaller than the configurations of FIGS. 12A to 12C, particularly in the left-right direction of the paper surface of FIG. In FIG.
  • substantially cylindrical switch protrusions 81 are arranged in a staggered manner as in FIG. 13, but the present invention is not limited to this, and substantially plate-like switch protrusions 81 are arranged in a line as in FIG. 12A. May be.
  • the shape of the switch protrusion 81 does not have to be a plate shape or a columnar shape as in the above embodiment, and may be an arbitrary shape. Further, the tip of the switch protrusion 81 does not have to be linear, and may have an arbitrary shape such as a substantially hemispherical surface.
  • the upper surface of the switch electrode 82 does not need to be a convex curved surface, and may be a flat surface like the switch electrode 52 of the first embodiment.
  • the plurality of switch protrusions are formed on the counter substrate 11 and the switch electrodes are formed on the active substrate 12, but the present invention is not limited to this.
  • a plurality of switch protrusions may be formed on the active substrate 12 and the switch electrode may be formed on the counter substrate 11.
  • the present invention can also be applied to a liquid crystal display panel having a so-called “Color Filter on Array” structure in which the color filter layer is formed on the active substrate 11 on which the TFT 16 and the pixel electrode 15 are formed.
  • the application field of the present invention is not particularly limited, and can be widely used for various liquid crystal display devices that require a touch sensor function.
  • a touch switch is incorporated in the liquid crystal cell, it is thin and has a good display quality, and is excellent in durability against repeated pressing, so that it is particularly preferably used for small information terminals such as mobile phones and PDAs. it can.

Abstract

Selon l'invention, un commutateur tactile (50) contient: des électrodes de commutation (52) formées sur un second substrat (12), une pluralité de parties saillie (51) formée sur un premier substrat (11) en faisant saillie vers une électrode de commutation commune, et des électrodes (27) formées à l'extrémité avant de la pluralité de parties saillie et électriquement connectées entre elles. Comme une pluralité de parties saillie fait face à une électrode de commutation, il est possible de répartir une pression tactile et de planifier sa redondance, améliorant ainsi la durabilité face à des poussées répétées.
PCT/JP2011/055259 2010-05-24 2011-03-07 Panneau d'affichage à cristaux liquides WO2011148690A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013186632A (ja) * 2012-03-07 2013-09-19 Toppan Printing Co Ltd フィルム状タッチパネルセンサー及びその製造方法
JP2013214185A (ja) * 2012-04-02 2013-10-17 Toppan Printing Co Ltd タッチパネルセンサー及びその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08235963A (ja) * 1995-03-01 1996-09-13 Alps Electric Co Ltd タブレット
JP2002287902A (ja) * 2001-01-17 2002-10-04 Seiko Epson Corp タッチパネル及び電子機器
JP2010039302A (ja) * 2008-08-06 2010-02-18 Sony Corp 液晶表示装置、及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08235963A (ja) * 1995-03-01 1996-09-13 Alps Electric Co Ltd タブレット
JP2002287902A (ja) * 2001-01-17 2002-10-04 Seiko Epson Corp タッチパネル及び電子機器
JP2010039302A (ja) * 2008-08-06 2010-02-18 Sony Corp 液晶表示装置、及びその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013186632A (ja) * 2012-03-07 2013-09-19 Toppan Printing Co Ltd フィルム状タッチパネルセンサー及びその製造方法
JP2013214185A (ja) * 2012-04-02 2013-10-17 Toppan Printing Co Ltd タッチパネルセンサー及びその製造方法

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