US20070200835A1 - Touch panel, display device with the same, and method for manufacturing the display device - Google Patents

Touch panel, display device with the same, and method for manufacturing the display device Download PDF

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Publication number
US20070200835A1
US20070200835A1 US11/713,235 US71323507A US2007200835A1 US 20070200835 A1 US20070200835 A1 US 20070200835A1 US 71323507 A US71323507 A US 71323507A US 2007200835 A1 US2007200835 A1 US 2007200835A1
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US
United States
Prior art keywords
display panel
mother
ultrasonic wave
transparent electrode
electrode layer
Prior art date
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Abandoned
Application number
US11/713,235
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English (en)
Inventor
Dae-ho Choo
Ho-Min Kang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Display Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOO, DAE-HO, KANG, HO-MIN
Publication of US20070200835A1 publication Critical patent/US20070200835A1/en
Priority to US13/011,737 priority Critical patent/US8581865B2/en
Assigned to SAMSUNG DISPLAY CO., LTD. reassignment SAMSUNG DISPLAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAMSUNG ELECTRONICS CO., LTD.
Abandoned legal-status Critical Current

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    • 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
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G06F3/0436—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20172—Fan mounting or fan specifications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • Y10T29/49133—Assembling to base an electrical component, e.g., capacitor, etc. with component orienting
    • Y10T29/49135—Assembling to base an electrical component, e.g., capacitor, etc. with component orienting and shaping, e.g., cutting or bending, etc.

Definitions

  • the present invention relates to a touch panel for a display device and, more particularly, to a more easily manufactured touch panel.
  • a liquid crystal display panel cannot emit light by itself, it is provided with a backlight assembly for emitting light.
  • a conventional backlight assembly is separately manufactured from the general display panel and then assembled with the display panel to form a display device.
  • a display device may be provided with a touch panel to enable the user to more easily indicate and obtain specific information.
  • the conventional touch panel is separately manufactured and is attached to a display device making the whole process of manufacturing a display device with a touch panel attached complicated and reducing productivity.
  • a more easily manufactured display having a touch panel includes: a base substrate; a first transparent electrode layer located on the base substrate; an ultrasonic wave guiding layer located on the first transparent electrode layer; a second transparent electrode layer located on the ultrasonic wave guiding layer; an ultrasonic wave transmitting unit and an ultrasonic wave receiving unit located on the second transparent electrode layer; and a protecting layer located on the second transparent electrode layer.
  • the ultrasonic wave transmitting unit may include X-axis transmitting units located along an edge of the base substrate, and Y-axis transmitting units located along another edge adjacent to the edge along which the X-axis transmitting units are located, and the ultrasonic wave receiving unit may include an X-axis receiving unit located along another edge opposite to the X-axis transmitting units, and a Y-axis receiving unit formed along another edge opposite to the Y-axis transmitting units.
  • the ultrasonic wave guiding layer may be made of a material including at least one of ZnO, Al-doped ZnO (AZO), and polyvinylidenefluoride (PVDF).
  • a display device includes: a display panel that has a plurality of pixels and displays an image; and a touch panel located on the front surface of the display panel.
  • the touch panel includes a base substrate; a first transparent electrode layer located on the base substrate; an ultrasonic wave guiding layer located on the first transparent electrode layer; a second transparent electrode layer located on the ultrasonic wave guiding layer; an ultrasonic wave transmitting unit and an ultrasonic wave receiving unit located on the second transparent electrode layer; and a protecting layer located on the second transparent electrode layer.
  • the ultrasonic wave transmitting unit may include X-axis transmitting units located along an edge of the base substrate, and Y-axis transmitting units located along another edge adjacent to the edge along which the X-axis transmitting units are located, and the ultrasonic wave receiving unit may include an X-axis receiving unit located along another edge opposite to the X-axis transmitting units, and a Y-axis receiving unit located along another edge opposite to the Y-axis transmitting units.
  • the ultrasonic wave guiding layer may be made of a material including at least one of ZnO, Al-doped ZnO (AZO), and polyvinylidenefluoride (PVDF).
  • the display panel may include a first display panel located on the rear side thereof, and a second display panel that is located on the front side thereof and is bonded to the first display panel, and the touch panel may be located on the front surface of the second display panel.
  • the display device may further include a backlight assembly located on the rear surface of the first display panel.
  • the backlight assembly may include a light source substrate, a driving circuit unit located on the light source substrate, an anode connected to the driving circuit unit, an organic layer located on the anode, and a cathode located on the organic layer.
  • the base substrate, the first display panel, the second display panel, and the light source substrate may be formed of a ceramic material to have rigidity.
  • the base substrate, the first display panel, the second display panel, and the light source substrate may be formed of a plastic material to have flexibility.
  • the organic layer may be divided into a plurality of regions corresponding to the pixels of the display panel, respectively, and the driving circuit unit may drive the plurality of regions of the organic layer to individually emit light.
  • the divided regions of the organic layer may emit three primary color light components.
  • the display device may further include a first polarizer attached between the rear surface of the first display panel and the backlight assembly, and a second polarizer attached between the front surface of the second display panel and the touch panel.
  • the display device may further include an additional polarizer attached between the rear surface of the first display panel and the backlight assembly.
  • a polarizer may be used as the base substrate of the touch panel.
  • the second display panel and the base substrate of the touch panel may be integrated into a whole.
  • a method of manufacturing a display device includes: providing a mother display panel; providing a mother touch panel of a front surface of the mother display panel; and providing a plurality of display panels each having a touch panel attached thereto by cutting the mother touch panel together with the mother display panel.
  • the mother display panel may include a first mother display panel located on the rear side thereof and a second mother display panel that is located on the front side thereof and bonded to the first mother display panel. Further, a first polarizer may be attached to the rear surface of the first mother display panel and a second polarizer may be attached to the front surface of the second mother display panel. Furthermore, the mother touch panel may be located on the front surface of the second polarizer.
  • the touch panel may include a base substrate attached to the second polarizer, a first transparent electrode layer located on the base substrate, an ultrasonic wave guiding layer located on the first transparent electrode layer, a second transparent electrode layer located on the ultrasonic wave guiding layer, an ultrasonic wave transmitting unit and an ultrasonic wave receiving unit located on the second transparent electrode layer, and a protecting layer located on the second transparent electrode layer.
  • the touch panel may include a first transparent electrode layer located on the second polarizer, an ultrasonic wave guiding layer located on the first transparent electrode layer, a second transparent electrode layer located on the ultrasonic wave guiding layer, an ultrasonic wave transmitting unit and an ultrasonic wave receiving unit located on the second transparent electrode layer, and a protecting layer located on the second transparent electrode layer.
  • the second polarizer having the mother touch panel attached thereto may be attached to the rear surface of the second mother display panel.
  • the mother touch panel may be attached to the second polarizer attached to the rear surface of the second mother display panel.
  • the method of manufacturing a display device may further include providing a mother backlight assembly on the first polarizer, and providing a plurality of display panels each having a touch panel and a backlight assembly attached thereto by cutting the mother backlight assembly together with the mother display panel and the mother touch panel in a mother display panel cutting process.
  • the first polarizer having the mother backlight assembly attached thereto may be attached to the rear surface of the first mother display panel.
  • the mother backlight assembly may be attached to the first polarizer attached to the rear surface of the first mother display panel.
  • the backlight assembly may include a light source substrate, a driving circuit unit located on the light source substrate, an anode connected to the driving circuit unit, an organic layer located on the anode, and a cathode located on the organic layer.
  • the method of manufacturing a display device may further include providing a backlight assembly on the rear surface of the display panel.
  • the mother display panel may be cut by any one of a water jet method, a wheel scriber method, and a laser cutting method.
  • a method of manufacturing a display device includes: providing a mother display panel; providing a mother backlight assembly on the rear surface of the mother display panel; providing a plurality of display panels each having a backlight assembly attached thereto by cutting the mother backlight assembly together with the mother display panel; and providing a touch panel on the front surface of the display panel.
  • the backlight assembly may include a light source substrate, a driving circuit unit located on the light source substrate, an anode connected to the driving circuit unit, an organic layer located on the anode, and a cathode located on the organic layer.
  • the mother display panel may include a first mother display panel located on the rear side thereof and a second mother display panel that is located on the front side thereof and is bonded to the first mother display panel. Further, a first polarizer may be attached to the rear surface of the first mother display panel and a second polarizer may be attached to the front surface of the second mother display panel. Furthermore, the mother backlight assembly may be located on the rear surface of the first polarizer.
  • the first polarizer having the mother backlight assembly attached thereto may be attached to the rear surface of the first mother display panel.
  • the mother backlight assembly may be attached to the first polarizer attached to the rear surface of the first mother display panel.
  • the touch panel may include a base substrate attached to the second polarizer, a first transparent electrode layer located on the base substrate, an ultrasonic wave guiding layer located on the first transparent electrode layer, a second transparent electrode layer located on the ultrasonic wave guiding layer, an ultrasonic wave transmitting unit and an ultrasonic wave receiving unit located on the second transparent electrode layer, and a protecting layer located on the second transparent electrode layer.
  • the touch panel may include a first transparent electrode layer located on the second polarizer, an ultrasonic wave guiding layer located on the first transparent electrode layer, a second transparent electrode layer located on the ultrasonic wave guiding layer, an ultrasonic wave transmitting unit and an ultrasonic wave receiving unit located on the second transparent electrode layer, and a protecting layer located on the second transparent electrode layer.
  • the mother display panel may be cut by any one of a water jet method, a wheel scriber method, and a laser cutting method.
  • FIG. 1 is a view illustrating the layout of a touch panel according to a first embodiment of the invention.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 .
  • FIG. 3 is a cross-sectional view illustrating a display device according to a second embodiment of the invention.
  • FIG. 4 is a cross-sectional view illustrating a display device according to a third embodiment of the invention.
  • FIG. 5 is a block diagram illustrating the display device shown in FIG. 3 and a structure for driving the display device.
  • FIG. 6 is an equivalent circuit diagram of one pixel of the display panel shown in FIG. 5 .
  • FIG. 7 is a flow chart representing a method for manufacturing a display device according to a fourth embodiment of the invention.
  • FIG. 8 is a flow chart representing a method for manufacturing a display device according to a fifth embodiment of the invention.
  • FIG. 9 is a flow chart representing a method for manufacturing a display device according to a sixth embodiment of the invention.
  • FIG. 1 is a view illustrating the layout of a touch panel 50
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 .
  • the touch panel 50 includes a base substrate 51 , a first transparent electrode layer 52 , an ultrasonic wave guiding layer 53 , a second transparent electrode layer 54 , an ultrasonic wave transmitting unit 55 , an ultrasonic wave receiving unit 56 , and a protecting layer 58 .
  • the base substrate 51 may be made of a material containing ceramic material, such as glass or quartz, or a plastic material. Also, the base substrate 51 may be formed to have rigidity or flexibility according to the kind of material thereof.
  • the ultrasonic wave guiding layer 53 is located on the first transparent electrode layer 52 , and the second transparent electrode layer 54 is located on the ultrasonic wave guiding layer 53 .
  • the ultrasonic wave guiding layer 53 is made of a material including at least one of ZnO, Al-doped ZnO (AZO), and polyvinylidenefluoride (PVDF).
  • the ultrasonic wave guiding layer 53 transmits an ultrasonic wave from the ultrasonic wave transmitting unit 55 to the ultrasonic wave receiving unit 56 such that a pressed position can be accurately detected.
  • the first transparent electrode layer 52 is located on the base substrate 51 , and the second transparent electrode layer 54 is formed to face the first transparent electrode layer 52 with the ultrasonic wave guiding layer 53 interposed therebetween.
  • the first transparent electrode layer 52 and the second transparent electrode layer 54 are made of a transparent conductive material, such as ITO (indium tin oxide) or IZO (indium zinc oxide).
  • the material of the ultrasonic wave guiding layer 53 has low adhesion to the insulating material used for forming the base substrate 51 or the protecting layer 58 , particularly, a silicon oxide based material.
  • the first transparent electrode layer 52 and the second transparent electrode layer 54 are located on and underneath the ultrasonic wave guiding layer 53 , respectively, and stably adhere to the ultrasonic wave guiding layer 53 while maintaining the ultrasonic wave guiding performance of the ultrasonic wave guiding layer 53 .
  • the ultrasonic wave transmitting unit 55 and the ultrasonic wave receiving unit 56 are located on the second transparent electrode layer 54 .
  • a pressed position in the touch panel 50 is detected on the basis of the difference between the ultrasonic wave transmitted by the ultrasonic wave transmitting unit 55 and the ultrasonic wave received by the ultrasonic wave receiving unit 56 .
  • the ultrasonic wave transmitted by the ultrasonic wave transmitting unit 55 moves along the ultrasonic wave guiding layer 53 .
  • the strength of the ultrasonic wave is reduced by the touch of a pen or finger. Therefore, the ultrasonic wave receiving unit 56 receives an ultrasonic wave having reduced strength, and thus an output voltage of an electrical signal corresponding to the received ultrasonic wave is also reduced.
  • the pressed position is detected on the basis of such an output voltage difference.
  • the ultrasonic wave transmitting unit 55 includes X-axis transmitting units 551 located along an edge of the base substrate 51 , and Y-axis transmitting units 552 located along another edge adjacent to the edge along which the X-axis transmitting units 551 are formed.
  • the ultrasonic wave receiving unit 56 includes an X-axis receiving unit 561 formed along another edge opposite to the X-axis transmitting units 551 , and a Y-axis receiving unit 562 formed along another edge opposite to the Y-axis transmitting units 552 .
  • the protecting layer 58 is located on the second transparent electrode layer 54 and protects the plurality of layers 52 , 53 , and 54 underneath the protecting layer 58 .
  • the protecting layer 58 is made of a transparent polymer based material.
  • the touch panel 50 having the above-mentioned structure can detect a position pressed by a pen P or a finger, as shown in FIG. 1 . Since the touch panel 50 according to the embodiment of the invention has a structure in which various kinds of layers are successively laminated, it can be manufactured by only a thin film forming process. Therefore, a plurality of touch panels 50 can be completed by preparing a relatively-large-sized mother base substrate, laminating various kinds of layers on the mother base substrate, and cutting the mother base substrate. As a result, it is easy to integrate the manufacturing process of the touch panel 50 into the manufacturing process of a display device to use the touch panel 50 , and thus the productivity is improved.
  • FIG. 3 illustrates a cross section of a display panel 100 including the touch panel 50 shown in FIG. 1 .
  • the liquid crystal display panel is shown in FIG. 1 as a display panel 20 used in the display device 100 .
  • the liquid crystal display panel is merely to illustrate the present invention, and the present invention is not limited thereto.
  • Other kinds of light receiving display panels may be used in the display device 100 .
  • the touch panel 50 according to the first embodiment of the present invention can also be applied to a display device using a self luminous display panel.
  • the display device 100 includes a display panel 20 that has a plurality of pixels and displays image, the touch panel 50 located above the front surface of the display panel 20 , and a backlight assembly 70 located above the rear surface of the display panel 20 .
  • the display device 100 further includes a first polarizer 31 located between the display panel 20 and the backlight assembly 70 , and a second polarizer 32 located between the display panel 20 and the touch panel 50 .
  • the display panel 20 includes a liquid crystal layer 23 , a first display panel 21 located on the rear surface of the liquid crystal layer 23 , and a second display panel 22 located on the front surface of the liquid crystal layer 23 .
  • the first display panel 21 and the second display panel 22 are bonded to each other by a sealant 25 .
  • the first polarizer 31 is attached to the rear surface of the first display panel 21
  • the second polarizer 32 is attached to the front surface of the first display panel 22 .
  • the touch panel 50 includes a base substrate 51 , a first transparent electrode layer 52 located on the base substrate 51 , an ultrasonic wave guiding layer 53 located on the first transparent electrode layer 52 , a second transparent electrode layer 54 located on the ultrasonic wave guiding layer 53 , and an ultrasonic wave transmitting unit 55 , an ultrasonic wave receiving unit 56 , and a protecting layer 58 located on the second transparent electrode layer 54 .
  • the base substrate 51 is attached to the second polarizer 32 .
  • the backlight assembly 70 includes a light source substrate 71 , a driving circuit unit 72 located on the light source substrate 71 , an anode 73 connected to the driving circuit unit 72 , an organic layer 74 located on the anode 73 , and a cathode 75 located on the organic layer 74 .
  • the backlight assembly 70 may further include a shielding layer (not shown) that is located on the light source substrate 71 and protects the organic layer 74 .
  • the organic layer 74 is located between the anode 73 , serving as a hole injection electrode, and the cathode 75 serving as an electron injection electrode. Holes and electrons are injected from the electrodes 73 and 75 into the organic layer 74 and form excitons. When the excitons change from the excited state to a base state, light is emitted.
  • the organic layer 74 may be formed of a low-molecular organic material or a high-molecular organic material.
  • the organic layer 74 may be formed in a single-layer structured light-emitting layer, or in a multi-layer structure including a light emitting layer and at least one of a hole injection layer (HIL), a hole transporting layer (HTL), a hole blocking layer, an electron transporting layer (ETL), an electron injection layer (EIL), and an electron blocking layer (EBL) formed around the light emitting layer.
  • HIL hole injection layer
  • HTL hole transporting layer
  • ETL electron transporting layer
  • EIL electron injection layer
  • EBL electron blocking layer
  • the driving circuit unit 72 includes thin film transistors, and controls the light emission of the organic layer 74 . That is, the driving circuit unit 72 controls the organic layer 74 to emit light over all so as to provide planar light to the display panel 20 .
  • the organic layer 74 may be divided into a plurality of regions corresponding to the pixels of the display panel 20 and the driving circuit unit 72 may control the plurality of divided regions of the organic layer 74 to individually emit light.
  • the divided regions of the organic layer 74 may emit three primary color light components.
  • color filters formed in the display panel 20 may be omitted.
  • the base substrate 51 , the first display panel 21 , the second display panel 22 , and the light source substrate 71 may be formed of a plastic material or a metallic material according to necessity to have flexibility.
  • Each of the touch panel 50 , the display panel 20 , and the backlight assembly 70 has a structure in which various kinds of films are successively laminated and most of the films have flexibility.
  • the display device 100 is formed to have flexibility as a whole.
  • Each of the base substrate 51 , the first display panel 21 , the second display panel 22 , and the light source substrate 71 may be made of a ceramic material, such as glass or quartz, to have rigidity.
  • a ceramic material such as glass or quartz
  • the display device 100 since each of the components of the display device 100 , that is, the touch panel 50 , the display panel 20 , and the backlight assembly 70 has a structure in which various kinds of films are successively laminated, the display device 100 can be manufactured by only a thin film forming process. Therefore, the manufacturing processes of the touch panel 50 and the backlight assembly 70 can be integrated into the manufacturing process of the display panel 20 using the touch panel 50 and the backlight assembly 70 .
  • a plurality of touch panels 50 or a plurality of backlight assemblies 70 may be manufactured by preparing a relatively-large-sized mother base substrate, laminating various kinds of films on the mother base substrate to form a mother touch panel or a mother backlight assembly, and cutting the mother touch panel or the mother backlight assembly.
  • a plurality of display panels 20 each having a touch panel 50 and a backlight assembly 70 attached thereto may be completed by attaching the mother touch panel and the mother backlight assembly to a mother display panel or directly forming the mother touch panel and the mother backlight assembly on the mother display panel, and cutting the mother display panel together with the mother touch panel and the mother backlight assembly.
  • the whole structure of the display device 100 can be simplified and the thickness of the backlight assembly 70 can be remarkably reduced, which is advantageous to reduce the thickness of the display device 100 .
  • the integration and simplification of the manufacturing processes are possible and thus the productivity can be improved.
  • a display device 200 includes a display panel 20 that has a plurality of pixels and displays image, a touch panel 50 located on the front surface of the display panel 20 , and a backlight assembly 70 located on the rear surface of the display panel 20 .
  • the display panel 20 includes a liquid crystal layer 23 , a first display panel 21 located on the rear surface of the liquid crystal layer 23 , and a second display panel 22 located on the front surface of the liquid crystal layer 23 .
  • the first display panel 21 and the second display panel 22 are bonded to each other by a sealant 25 .
  • the touch panel 50 is located on the front surface of the second display panel 22
  • the backlight assembly 70 is located on the rear surface of the first display panel 21 .
  • the touch panel 50 includes a base substrate 32 , a first transparent electrode layer 52 located on the base substrate 51 , an ultrasonic wave guiding layer 53 located on the first transparent electrode layer 52 , a second transparent electrode layer 54 located on the ultrasonic wave guiding layer 53 , and an ultrasonic wave transmitting unit 55 , an ultrasonic wave receiving unit 56 , and a protecting layer 58 located on the second transparent electrode layer 54 .
  • a polarizer is used as the base substrate 32 , and the display device 200 further includes an additional polarizer 31 located between the first display panel 21 and the backlight assembly 70 . Since the base substrate 32 of the touch panel 50 is a polarizer, it is unnecessary to provide a separate polarizer between the touch panel 50 and the display panel 20 .
  • the touch panel 50 is formed by using a polarizer as the base substrate 32 and is then attached to the second display panel 22 of the display panel 20 , and it is possible that the base substrate 32 is formed by attaching a polarizer to the second display panel 22 of the display panel 20 and then a touch panel 50 is located on the base substrate 32 . Therefore, the structure and manufacturing process of the display device 200 can be further simplified.
  • the display panel 20 is a liquid crystal panel.
  • the first display panel 21 includes a plurality of signal lines G 1 -G n and D 1 -D m
  • the first display panel 21 and the second display panel 22 include a plurality of pixels which are connected to the signal lines G 1 -G n and D 1 -D m and are arranged substantially in a matrix.
  • the signal lines G 1 -G n and D 1 -D m are composed of a plurality of gate lines G 1 -G n through which gate signals (referred to as “scanning signals”) are transmitted and a plurality of data lines D 1 -D m through which data signals are transmitted.
  • the gate lines G 1 -G n extend in a row direction so as to be parallel to each other, and the data lines D 1 -D m extend in a column direction so as to be parallel to each other.
  • Each pixel includes a switching element Q connected to one of the gate lines G 1 -G n and one of the data lines D 1 -D m , and a liquid crystal capacitor C LC and a storage capacitor C ST connected to the switching element Q.
  • the storage capacitor C ST may be omitted, if necessary.
  • the switching element Q is a thin film transistor and the switching elements are formed in the first display panel 21 .
  • the thin film transistor is a three-terminal element. A control terminal and an input terminal of the thin film transistor are connected to one of the gate lines G 1 to G n and one of the data lines D 1 to D n , respectively, and an output terminal thereof is connected to the liquid crystal capacitor C LC and the storage capacitor C ST .
  • a signal controller 600 controls the operation of a gate driver 400 and a data driver 500 .
  • the gate driver 400 supplies gate signals, each composed of a combination of a gate-on voltage Von and a gate-off voltage Voff, to the gate lines G 1 to G n .
  • the data driver 500 applies a data voltage to the data lines D 1 to D n .
  • a gray voltage generator 800 generates two gray voltage groups related to the transmittance of the pixel, each gray voltage group having a plurality of gray voltages and provides the two pairs of gray voltage groups to the data driver 500 .
  • One of the gray voltage groups has a positive value with respect to a common voltage Vcom, and the other gray voltage group has a negative value with respect to the common voltage Vcom.
  • the liquid crystal capacitor C LC has as two terminals a pixel electrode 218 of the first display panel 21 and a common electrode 229 of the second display panel 22 , and also has the liquid crystal layer 23 between the two electrodes 218 and 219 as a dielectric.
  • the pixel electrode 218 is connected to the switching element Q and the common electrode 229 is formed over the entire surface of the second display panel 22 .
  • the common voltage Vcom is applied to the common electrode 229 .
  • the common electrode 229 may be provided on the first display panel 21 . At least one of the two electrodes 218 and 229 may be formed in a linear or bar shape.
  • Color filters 225 for coloring light passing through are located on the second display panel 22 .
  • the color filters 225 may also be located on the first display panel 21 . As described in the second exemplary embodiment, when the backlight assembly provides three primary color light components corresponding to the individual pixels, the color filters 225 may be omitted.
  • the storage capacitor C ST serving as an auxiliary member of the liquid crystal capacitor C LC , is composed of a separate signal line (not shown) provided on the first display panel 21 , the pixel electrode 218 , and an insulator interposed therebetween.
  • a predetermined voltage such as the common voltage Vcom, is applied to the signal line.
  • the storage capacitor C ST may be a laminated structure of the pixel electrode 218 , the insulator, and a previous gate line of the gate lines G 1 to G n located on the insulator.
  • a polarizer (not shown) for polarizing light is attached to the outer surface of at least one of the two display panels 21 and 22 of the display panel 50 .
  • the thin film transistor serving as the switching element
  • an electric field is formed between the pixel electrode 218 and the common electrode 229 .
  • the electric field changes the alignment angle of liquid crystal between the first display panel 21 and the second display panel 22 , and accordingly, the optical transmittance is changed. In this way, a desired image is obtained.
  • the polarizers 31 and 32 attached to the display panel 20 may be omitted. Therefore, the base substrate 51 of the touch panel 50 and the second display panel 22 of the display panel 20 may be integrated into a whole, integrally formed. In other words, the touch panel 50 may be formed by using the second display panel 22 of the display panel 20 as the base substrate and directly laminating various kinds of layers thereon. As a result, the display device can be further simplified, the thickness thereof can be further reduced, and the manufacturing process thereof can be simplified.
  • FIG. 7 is a flow chart representing a method of manufacturing the display device shown in FIGS. 3 and 4 .
  • a method of manufacturing the display device includes: providing a mother display panel SA 100 ; providing a mother touch panel on the front surface of the mother display panel SA 200 ; providing a plurality of display panels 20 (shown in FIG. 3 ) each having a touch panel 50 (shown in FIG. 3 ) attached thereto by cutting the mother touch panel together with the mother display panel SA 300 ; and providing a backlight assembly 70 (shown in FIG. 3 ) on the rear surface of each display panel 20 SA 400 .
  • the mother display panel includes a first mother display panel located on the rear side thereof and a second mother display panel that is located on the front side thereof and is bonded to the first mother display panel.
  • the method of manufacturing the display device further includes attaching a first polarizer to the rear surface of the first mother display panel and attaching a second polarizer to the front surface of the second mother display panel. Then, the mother touch panel is located on the front surface of the second polarizer.
  • the touch panel 50 includes a base substrate 51 , a first transparent electrode layer 52 located on the base substrate 51 , an ultrasonic wave guiding layer 53 located on the first transparent electrode layer 52 , a second transparent electrode layer 54 located on the ultrasonic wave guiding layer 53 , and an ultrasonic wave transmitting unit 55 , an ultrasonic wave receiving unit 56 , and a protecting layer 58 located on the second transparent electrode layer 54 , as shown in FIG. 3 .
  • the base substrate 51 is attached to the second polarizer 32 .
  • the touch panel 50 may include a first transparent electrode layer 52 located on the second polarizer 32 , an ultrasonic wave guiding layer 53 located on the first transparent electrode layer 52 , a second transparent electrode layer 54 located on the ultrasonic wave guiding layer 53 , and an ultrasonic wave transmitting unit 55 , an ultrasonic wave receiving unit 56 , and a protecting layer 58 located on the second transparent electrode layer 54 , as shown in FIG. 4 .
  • the mother touch panel, the second polarizer, and the second mother display panel are attached to one another, it is possible that the mother touch panel is first attached to or directly located on the second polarizer and then the second polarizer is attached to the front surface of the second mother display panel. Alternatively, it is possible that the second polarizer is first attached to the second mother display panel and then the mother touch panel is attached to or directly located on the second polarizer.
  • the manufacturing process of the touch panel 50 is integrated into the manufacturing process of the display panel 20 having the touch panel attached thereto. More specifically, the display panel 20 having the touch panel 50 attached thereto can be completed by attaching the mother touch panel to the mother display panel or directly forming the mother touch panel on the mother display panel and cutting the mother touch panel together with the mother display panel in a mother display panel cutting process. Then, the backlight assembly 70 is separately attached to the rear surface of the display panel 20 . Therefore, the whole manufacturing process of the display panel can be simplified.
  • the mother display panel cutting process is performed by any one of a water jet method, a wheel scriber method, and a laser cutting method.
  • the water jet method is a method of cutting an object by jetting water at high pressure
  • the wheel scriber method is a method of cutting an object by pressing the object while rolling a wheel-shaped member thereon
  • the laser cutting method is a method of cutting an object using a laser.
  • each of the touch panel 50 and display panel 20 has a structure in which various kinds of films are successively laminated, it is possible to cut the mother display panel and the mother touch panel at the same time by using a relatively simple physical cutting method. Therefore, the productivity of the display panel can be further improved.
  • FIG. 8 is a flow chart representing another method of manufacturing the display device shown in FIGS. 3 and 4 .
  • another method of manufacturing the display device includes: providing a mother display panel SB 100 ; providing a mother backlight assembly on the rear surface of the mother display panel SB 200 ; providing a plurality of display panels 20 each having a backlight assembly 70 attached thereto by cutting the mother backlight assembly together with the mother display panel SB 300 ; and providing a touch panel 50 on the front surface of each display panel 20 SB 400 .
  • the mother display panel includes a first mother display panel located on the rear side thereof, and a second mother display panel that is located on the front side thereof and is bonded to the first mother display panel.
  • the method according to this embodiment further includes attaching a first polarizer to the rear surface of the first mother display panel, and attaching a second polarizer to the front surface of the second mother display panel. Then, the mother backlight assembly is located on the first polarizer.
  • the backlight assembly 70 includes a light source substrate 71 , a driving circuit unit 72 located on the light source substrate 71 , an anode 73 connected to the driving circuit unit 72 , an organic layer 74 located on the anode 73 , and a cathode 75 located on the organic layer 74 , as shown in FIGS. 3 and 4 .
  • the backlight assembly 70 may further include a shielding layer (not shown) that is located on the light source substrate 71 and protects the organic layer 74 .
  • the mother backlight panel, the first polarizer, and the first mother display panel are attached to one another, it is possible that the mother backlight panel is first attached to or directly located on the first polarizer and then the first polarizer is attached to the rear surface of the first mother display panel. Alternatively, it is possible that the first polarizer is firstly attached to the first mother display panel and then the mother backlight panel is attached to or directly located on the rear surface of the first polarizer.
  • the manufacturing process of the backlight assembly 70 is integrated into the manufacturing process of the display panel 20 having the backlight assembly attached thereto. More specifically, the display panel 20 having the backlight assembly 70 attached thereto can be completed by attaching the mother backlight assembly to the mother display panel or directly providing the mother backlight assembly on the mother display panel and cutting the mother backlight assembly together with the mother display panel in a mother display panel cutting process. Then, the touch panel 50 is attached to the front surface of the display panel 20 . Therefore, the whole manufacturing process of the display panel can be simplified.
  • each of the backlight assembly 70 and display panel 20 has a structure in which various kinds of films are successively laminated, it is possible to cut the mother display panel and the mother backlight assembly at the same time by using a physical cutting method. Therefore, the productivity of the display panel can be further improved.
  • FIG. 9 is a flow chart representing another method of manufacturing the display panel shown in FIGS. 3 and 4 .
  • the method of manufacturing the display device includes: providing a mother display panel SC 100 ; providing a mother touch panel on the front surface of the mother display panel SC 200 ; providing a mother backlight assembly on the rear surface of the mother display panel SC 300 ; and providing a plurality of display panels 20 each having a touch panel 50 and a backlight assembly 70 attached thereto by cutting the mother touch panel and the mother backlight assembly together with the mother display panel SC 400 .
  • the mother display panel includes a first mother display panel located on the rear side thereof, and a second mother display panel that is located on the front side thereof and is bonded to the first mother display panel.
  • the method according to the sixth embodiment further includes attaching a first polarizer to the rear surface of the first mother display panel, and attaching a second polarizer to the front surface of the second mother display panel. Then, the mother touch panel is located on the front surface of the second polarizer and the mother backlight assembly is located on the rear surface of the first polarizer.
  • the manufacturing processes of the touch panel 50 and the backlight assembly 70 are integrated into the manufacturing process of the display panel 20 having the touch panel 50 and the backlight assembly attached thereto. More specifically, the display panel 20 having the touch panel 50 and the backlight assembly 70 attached thereto can be completed by attaching the mother touch panel and the mother backlight assembly to the mother display panel or directly providing the mother touch panel and the mother backlight assembly on the mother display panel, and cutting the mother touch panel and the mother backlight assembly together with the mother display panel in a mother display panel cutting process. Therefore, the whole manufacturing process of the display panel can be simplified.
  • each of the backlight assembly 70 and display panel 20 has a structure in which various kinds of films are successively laminated, it is possible to cut the mother display panel and the mother backlight assembly at the same time by using a physical cutting method. Therefore, the productivity of the display panel can be further improved.
  • the present invention it is possible to improve the structure of the touch panel and thus to improve the productivity. Further, it is possible to provide a small-sized and thin display device having the touch panel, which has a simplified whole structure and improved productivity.
  • each of components of the display device that is, the touch panel, the display panel, and the backlight assembly has a structure in which various films are successively laminated
  • the display panel having the touch panel and the backlight assembly attached thereto can be completed by attaching the mother touch panel and the mother backlight assembly to the mother display panel or directly providing the mother touch panel and the mother backlight assembly on the mother display panel, and cutting the mother touch panel and the mother backlight assembly together with the mother display panel in a mother display panel cutting process. Therefore, the whole structure of the display device can be simplified and the thickness of the backlight assembly can be remarkably reduced, which is favorable to reduce the thickness of the display device.
  • the display device can be manufactured by a relatively simple physical cutting method, it is possible to further improve the productivity.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Thermal Sciences (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Position Input By Displaying (AREA)
US11/713,235 2006-02-28 2007-02-28 Touch panel, display device with the same, and method for manufacturing the display device Abandoned US20070200835A1 (en)

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KR20070089356A (ko) 2007-08-31
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KR101337264B1 (ko) 2013-12-05
US20110107593A1 (en) 2011-05-12
JP2007234025A (ja) 2007-09-13
US8581865B2 (en) 2013-11-12

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