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Browse Prior Art Database

LC Panel Design for Seal Edge Identification

IP.com Disclosure Number: IPCOM000014649D
Original Publication Date: 2000-Mar-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 96K

Publishing Venue

IBM

Abstract

Disclosed herein is a metal line design for seal edge identification and seal adhesion improvement, where Vcom (connected to common electrode) metal line or Cs (connected to storage capacitor) metal line is split into more than two along the seal edge in parallel. By this design, seal edge can be identified and seal strength is improved. Narrower peripheral design around the pixel area is a must for LCD panel-design, and requires seal edge close to the pixel. On that case, seal edge identification is important to decide the quality of seal. And it is done easily by human eye or by image handling tool. Usually, seal edge is on the black matrix of color filter, which is surrounding the pixel area. So seal edge is difficult to identify and must be viewed and identified from TFT side, where Vcom line or Cs line is also masking the seal optically. Figure shows the disclosure in detail. The metal line of Vcom or Cs is split into two in this case at metal line edge (out of pixel area). By splitting the metal line, there exist light transparent area (glass surface: Wg1, Wg2) and light shield area (metal surface: Wa, Wb). Design points and pass decision for pixel-peripheral are: 1) Wa LC (liquid crystal) defect area (LC alignment failed area close to the seal)

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LC Panel Design for Seal Edge Identification

  Disclosed herein is a metal line design for seal edge identification and seal adhesion improvement, where Vcom (connected to common electrode) metal line or Cs (connected to storage capacitor) metal line is split into more than two along the seal edge in parallel. By this design, seal edge can be identified and seal strength is improved.

Narrower peripheral design around the pixel area is a must for LCD panel-design, and requires seal edge close to the pixel. On that case, seal edge identification is important to decide the quality of seal. And it is done easily by human eye or by image handling tool. Usually, seal edge is on the black matrix of color filter, which is surrounding the pixel area. So seal edge is difficult to identify and must be viewed and identified from TFT side, where Vcom line or Cs line is also masking the seal optically.

Figure shows the disclosure in detail. The metal line of Vcom or Cs is split into two in this case at metal line edge (out of pixel area). By splitting the metal line, there exist light transparent area (glass surface: Wg1, Wg2) and light shield area (metal surface: Wa, Wb). Design points and pass decision for pixel-peripheral are:
1) Wa > LC (liquid crystal) defect area (LC alignment failed area close to the seal)
2) Wb : dimension decided by seal waviness
3) Seal Inner Edge: outer of right edge of Wa (to prevent defect appearance on pixel), inner of right edge of Wb (to be cut on...