Liquid Crystal Display Spacer Removal to Prevent Electrode Cracking
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Solution Overview
Problem
Liquid crystal display devices in the transverse electric field mode face issues with pixel defects due to pressure application, as spacers transmit force to hard electrode and insulating films, causing deformation and potential breakage of soft interlayer insulation films, leading to short-circuiting and defects.
Innovation Solution
The common electrode film, pixel electrode film, or both are partly removed in regions corresponding to the spacer, and the pixel insulation film is also partly removed, allowing the spacer to be pushed towards the substrate, preventing crack occurrence and short-circuiting when force is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spacer is disposed in the pixel, then the distance between substrates is maintained, but the interlayer insulation film is deformed and cracks occur in the electrode films when pressure is applied
Solution Approach 1:
The patent extracts the spacer from the pixel region and relocates it to the non-display region. This removal of the spacer from the pixel area eliminates the source of pressure concentration that causes deformation of the interlayer insulation film and cracking of the electrode films, while still maintaining the necessary substrate distance through alternative positioning in the non-display region.
Solution Approach 2:
The patent introduces a recess structure in the color filter layer as an intermediary element. This recess accommodates the spacer and provides a dedicated space that isolates the spacer from the pixel electrode films, preventing direct mechanical interaction and stress transmission while maintaining the spacer's function of defining substrate distance.
2Power
If the pixel insulation film is thinned to increase the electric field, then the electric field strength is improved, but the spacer causes cracks and short-circuiting more easily
Solution Approach 1:
By extracting the spacer from the pixel region and relocating it to the non-display region, the patent eliminates the mechanical stress source that would otherwise concentrate on the thinned pixel insulation film. This allows the insulation film to be thinned for enhanced electric field strength without compromising reliability, as the spacer no longer transmits pressure to this vulnerable region.
3Adaptability or versatility
If the screen is frequently touched for image pickup function, then the device functionality is enhanced, but the possibility of pixel defects due to pressure increases
Solution Approach 1:
The patent extracts the spacer from the pixel region and relocates it to the non-display region, eliminating the mechanical stress source that would otherwise concentrate on the electrode films during finger contact. This structural modification allows the device to maintain its image pickup functionality through frequent touching while preventing the pressure-induced pixel defects that would occur with the traditional in-pixel spacer configuration.
Data Source
AI summary
The present invention provides a liquid crystal display device realizing improved reliability by preventing occurrence of a pixel defect. A liquid crystal display includes first and second substrates. A spacer maintains a distance between the first and second glass substrates. A liquid crystal layer is provided between the first and second substrates. A pixel electrode film and a common electrode film are formed over a base insulation film of the first substrate so as to sandwich a pixel insulation film in between. The common electrode film, the pixel electrode film or both of them are partly removed in a region corresponding to the spacer, and the pixel insulation film is partly removed in that region. It prevents the film structure from being broken due to deformation of the base insulation film made of a soft material caused by a pressure applied onto the spacer.