# US 8,786,571 B2 · Liquid crystal display device and a method of manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,571 B2 - Document ID: US8786571B2 - Status: Granted - Kind: B2 - Application number: 12/534,265 - Filed: 2009-08-03 - Published: 2010-02-11 - Granted: 2014-07-22 - Earliest claimed: 2008-08-07 - Assignees: Japan Display West Inc. - Applicants: Takeo Koito; Koji Noguchi - Inventors: Takeo Koito; Koji Noguchi - Web page: https://patentgrep.com/patent/US8786571B2 ## CPC - G02F 1/13338: {Input devices, e.g. touch panels} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/047: using sets of wires, e.g. crossed wires - 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 - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A liquid crystal display device includes a first substrate on a display surface side; a second substrate on a back surface side; a liquid crystal layer formed between the first and second substrates; an alignment film formed on one of the first and second substrates so as to contact the liquid crystal layer; a first sensor electrode formed on a surface, of the alignment film, contacting the liquid crystal layer; and a second sensor electrode formed on the other of the first and second substrates, and adapted to either contact or approach the first sensor electrode when the first substrate is pressed from the display surface side. ## Claims ### Claim 1 A liquid crystal display device, comprising: a plurality of pixels disposed in a matrix, each pixel having a pixel area including (i) an effective pixel area for an image display, and (ii) a peripheral pixel area surrounding said effective pixel area; a first substrate on a display surface side; a second substrate on a back surface side; a liquid crystal layer between said first and second substrates; a first alignment film carried on a side of said first substrate proximate to said liquid crystal layer; a first sensor electrode (i) carried on said first alignment film in a light blocking area where a transistor is disposed, and (ii) having a pattern of rectangles elongated in one direction at least within said effective pixel area; a height adjusting protrusion (i) carried on a side of said second substrate proximate to said liquid crystal layer, (ii) extending into said liquid crystal layer, and (iii) extending toward said first sensor electrode in said light blocking area; a pixel electrode carried on said second substrate and covering an entirety of said pixel area of each of said plurality of pixels, a first part of said pixel electrode (i) formed on said height adjusting protrusion, (ii) configured as a second sensor electrode, and (iii) operable to approach or contact said first sensor electrode when said first substrate is pressed toward said second substrate; a second alignment film (i) carried on said second substrate, (ii) formed on a second part of said pixel electrode surrounding said height adjusting protrusion, (iii) not formed on said first part of said pixel electrode on said height adjusting protrusion, and (iv) having a variable thickness; and a circuit (i) configured to read an electrical change between said first sensor electrode and said first part of said pixel electrode configured as said second sensor electrode, and (ii) electrically connected with a signal line, said signal line disposed along pixel columns in said matrix of said plurality of pixels to permit touch detection for each of said plurality of pixels. ### Claim 2 (depends on 1) The liquid crystal display device according to claim 1, wherein: a common electrode is carried on said first substrate, said common electrode is common to said plurality of pixels, and said first sensor electrode is electrically connected to said common electrode. ### Claim 3 (depends on 1) The liquid crystal display device according to claim 1, wherein said height adjusting protrusion is made of a light blocking material. ### Claim 4 (depends on 1) The liquid crystal display device according to claim 1, wherein: said first substrate has a recess portion in a part of a surface on which said first alignment film is formed, said first alignment film is continuous between an inside and an outside of said recess portion, and said first sensor electrode is positioned within said recess portion. ### Claim 5 (depends on 4) The liquid crystal display device according to claim 4, wherein: a color filter layer is disposed between said first substrate and said first alignment film in a light transmitting area; and said recess portion (i) is formed in said light blocking area, and (ii) has a shape corresponding to an edge of said color filter adjacent to said light blocking area. ### Claim 6 (depends on 1) The liquid crystal display device according to claim 1, wherein said one direction of said pattern of rectangles is a rubbing direction of said first alignment film. ### Claim 7 (depends on 6) The liquid crystal display device according to claim 6, wherein each of said rectangles in said pattern of rectangles are electrically connected to one another outside of said effective pixel area. ### Claim 8 (depends on 1) The liquid crystal display device according to claim 1, wherein: (a) said pixel electrode includes a plurality of pixel electrodes disposed in said matrix, said plurality of pixel electrodes configured to locally apply different electric fields to said liquid crystal layer; (b) said signal line includes a plurality of signal lines within a wiring group, said wiring group configured for matrix-driving applied voltages corresponding to respective pixels; (c) said transistor configured to control a connection between said signal lines within said wiring group; and (d) said plurality of pixel electrodes are disposed on said second substrate, thereby partitioning a planar surface when viewed from said display surface by said plurality of pixels. ### Claim 9 (depends on 1) The liquid crystal display device according to claim 1, wherein: second sensor electrode has a pattern of rectangles elongated in another direction and perpendicularly intersecting with said one direction at least within said effective pixel area; a change in potential of said second sensor electrode is detected when a voltage is applied to said first sensor electrode in a longitudinal direction of the rectangular or line-like shape; a change in potential of said first sensor electrode is detected when a voltage is applied to said second sensor electrode in a longitudinal direction of the rectangular or line-like shape; and a portion in which said first sensor electrode and said sensor electrode either contact or approach each other is detected based on potential changes in the two detection results. ### Claim 10 (depends on 1) The liquid crystal display device of claim 1, wherein: said second alignment film is at least partially formed directly on said second sensor electrode, and said second sensor electrode is at least partially embedded in said second alignment film. ### Claim 11 (depends on 1) The liquid crystal display device of claim 1, wherein, the height adjusting portion (i) has an oval shape when viewed from the display surface side, and (ii) is formed as an isolated pattern. ### Claim 12 A method of manufacturing a liquid crystal display device, comprising: disposing a plurality of pixels disposed in a matrix, each pixel having a pixel area including (i) an effective pixel area for an image display, and (ii) a peripheral pixel area surrounding said effective pixel area; disposing a first substrate on a display surface side; disposing a second substrate on a back surface side; injecting a liquid crystal layer between said first substrate and second substrates; forming a first alignment film on a side of said first substrate proximate to said liquid crystal layer; forming a first sensor electrode (i) carried on said first alignment film in a light blocking area where a transistor is disposed, and (ii) having a pattern of rectangles elongated in one direction at least within said effective pixel area; forming a height adjusting protrusion (i) carried on a side of said second substrate proximate to said liquid crystal layer, (ii) extending into said liquid crystal layer, and (iii) extending toward said first sensor electrode is said light blocking area; forming a pixel electrode carried on said second substrate and covering an entirety of said pixel area of each of said plurality of pixels, a first part of said pixel electrode (i) formed on said height adjusting protrusion, (ii) configured as a second sensor electrode, and (iii) operable to approach or contact said first sensor electrode when said first substrate is pressed toward said second substrate; forming a second alignment film (i) carried on said second substrate, (ii) formed on a second part of said pixel electrode surrounding said height adjusting protrusion, (ii) not formed on said first part of said pixel electrode on said height adjusting protrusion, and (iv) having a variable thickness; and disposing a circuit (i) configured to read an electrical change between said first sensor electrode and said first part of said pixel electrode configured as said second sensor electrode, and (ii) electrically connected with a signal line, said signal line disposed along pixel columns in said matrix of said plurality of pixels to permit touch detection for each of said plurality of pixels. ### Claim 13 (depends on 12) The method of manufacturing a liquid crystal display device according to claim 12, wherein, said alignment film has a rubbing direction, and said one direction of said pattern of rectangles of said first sensor electrode extends lengthwise in said rubbing direction at least within said effective pixel area.