# US 7,609,357 B2 · Liquid crystal panel having dual column spacer and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,357 B2 - Document ID: US7609357B2 - Status: Granted - Kind: B2 - Application number: 11/475,927 - Filed: 2006-06-28 - Published: 2007-01-04 - Granted: 2009-10-27 - Earliest claimed: 2005-06-30 - Assignees: LG Display Co., Ltd. - Inventors: Pyung Hun Kim - Web page: https://patentgrep.com/patent/US7609357B2 ## CPC - G02F 1/13394: {spacers regularly patterned on the cell subtrate, e.g. walls, pillars (G02F1/133377 takes precedence)} - G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)} - G02F 1/136227: {Through-hole connection of the pixel electrode to the active element through an insulation layer} - G02F 2201/50: Protective arrangements - 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 ## Abstract Disclosed is a liquid crystal panel having a dual column spacer and a manufacturing method thereof. The liquid crystal panel includes a first substrate on which a polished organic insulation film is formed on the entire surface of a pixel region including a TFT. The first substrate includes a contact hole formed through the organic insulation film; a second substrate disposed opposite to the first substrate and having a black matrix and a color filter; a first column spacer formed on the second substrate to contact the first substrate to maintain a gap between the first substrate and the second substrate; and a second column spacer formed on the second substrate on an area of the second substrate corresponding to the contact hole on the first substrate. The second column spacer is separated from the first substrate by a predetermined distance. ## Claims ### Claim 1 A liquid crystal panel comprising: a first substrate on which a polished organic insulation film is formed on the entire surface of a pixel region including a TFT, the first substrate including a contact hole formed through the organic insulation film; a second substrate disposed opposite to the first substrate and having a black matrix and a color filter formed thereon; a liquid crystal layer formed between the first substrate and the second substrate; a first column spacer formed on the second substrate to contact the first substrate to maintain a gap between the first substrate and the second substrate; and a second column spacer formed on the second substrate on an area of the second substrate corresponding to the contact hole on the first substrate, wherein the second column spacer is formed on the second substrate to be non-overlapped with the black matrix and is formed to be separated from the first substrate by a predetermined distance. ### Claim 2 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the contact hole is formed to connect a pixel electrode partially formed on the organic insulation film to a drain electrode of the TFT formed below the organic insulation film. ### Claim 3 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the contact hole is formed to connect a pixel electrode partially formed on the organic insulation film to a metal electrode of a capacitor formed below the organic insulation film. ### Claim 4 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the polished organic insulation film is a photo acryl layer. ### Claim 5 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the polished organic insulation film is formed to have a thickness of approximately 1.5 μm to approximately 3.5 μn. ### Claim 6 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the first column spacer and the second column spacer are formed to have substantially the same height on the second substrate. ### Claim 7 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the contact hole in the organic insulation film is etched to form the contact hole. ### Claim 8 (depends on 7) The liquid crystal panel as claimed in claim 7, wherein an etch depth of the contact hole is formed to be smaller than a longitudinal length of the second column spacer. ### Claim 9 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein a cross section of an opening portion of the contact hole is formed to be larger than a cross section of the second column spacer. ### Claim 10 (depends on 1) The liquid crystal panel as claimed in claim 1, wherein the first column spacer is formed between the TFT of the first substrate and the black matrix of the second substrate, and the second column spacer is formed between the pixel electrode of the first substrate and the color filter of the second substrate. ### Claim 11 A method of manufacturing a liquid crystal panel comprising: preparing a first substrate on which a TFT array is formed; preparing a second substrate on which a black matrix and a color filter array are formed; forming an organic insulation film on the first substrate and polishing the organic insulation film; forming a pixel electrode partially on the polished organic insulator film; forming a contact hole through the organic insulation film; forming a first column spacer on the first substrate to contact the second substrate to maintain a gap between the first substrate and the second substrate; forming a second column spacer on the second substrate on an area of the second substrate corresponding to the contact hole, wherein the second column spacer, wherein the second column spacer is formed on the second substrate to be non-overlapped with the black matrix and is separated by a predetermined distance from the first substrate; and forming a liquid crystal layer between the first and second substrates. ### Claim 12 (depends on 11) The method as claimed in claim 11, wherein forming a contact hole on the organic layer includes forming a contact hole to connect the pixel electrode to a drain electrode of a TFT formed below the organic insulation film. ### Claim 13 (depends on 12) The method as claimed in claim 12, wherein forming a contact hole on the organic layer includes etching the polished organic insulation film to form the contact hole to expose the drain electrode of the TFT. ### Claim 14 (depends on 11) The method as claimed in claim 11, wherein the first substrate includes a capacitor formed below the organic insulation film, and wherein forming a contact hole on the organic layer includes forming a contact hole to connect a pixel electrode formed partially on the polished organic insulation film to a metal electrode of the capacitor. ### Claim 15 (depends on 14) The method as claimed in claim 14, wherein forming a contact hole includes etching the polished organic insulation film to expose the metal electrode of the capacitor. ### Claim 16 (depends on 11) The method as claimed in claim 11, wherein the organic insulation film is a photo acryl layer. ### Claim 17 (depends on 11) The method as claimed in claim 11, wherein forming an organic insulation film on the first substrate and polishing the organic insulation film includes forming the organic insulation film to a thickness of approximately 1.5 μm to approximately 3.5 μm. ### Claim 18 (depends on 11) The method as claimed in claim 11, wherein forming a contact hole includes forming a cross section of an opening portion of the contact hole to be larger than a cross section of the second column spacer. ### Claim 19 (depends on 11) The method as claimed in claim 11, wherein forming a contact hole includes forming the contact hole to have an etch depth smaller than a longitudinal length of the second column spacer. ### Claim 20 (depends on 11) The method as claimed in claim 11, wherein forming a first column spacer includes forming the first column spacer to be between the TFT of the first substrate and the black matrix of the second substrate, and wherein forming a second column spacer includes formed the second column spacer between the pixel electrode of the first substrate and the color filter of the second substrate. ### Claim 21 (depends on 11) The method as claimed in claim 11, wherein forming a second column spacer includes forming the second column spacer to have substantially the same height on the second substrate as the first column spacer.