Display Panel Post Spacer with Supporting Block
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Solution Overview
Problem
Thin film transistor liquid crystal display (TFT-LCD) devices face issues with post spacers scratching the polyimide alignment film when subjected to external forces, leading to poor display quality like light spots, and widening black matrices to prevent this decreases the aperture ratio and transmission rate.
Innovation Solution
A display panel design featuring post spacers with a spacer supporting block that prevents the end portion of the post spacer from contacting the substrate under external force, allowing the post spacer to overlap with the block and avoiding contact with the polyimide film, while maintaining the black matrices' original width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black matrices are widened to prevent post spacers from scratching the alignment film, then the reliability is improved, but the aperture ratio decreases
Solution Approach 1:
The invention introduces a spacer supporting block as a separate structural element that divides the support function: the post spacer provides spacing while the spacer supporting block provides mechanical support to prevent scratching. This segmentation allows the black matrix to maintain its original width without needing to be widened for protection.
Solution Approach 2:
The spacer supporting block acts as an intermediary between the post spacer and the alignment film. Instead of the post spacer directly contacting and potentially scratching the alignment film, the spacer supporting block provides a protective interface that prevents direct contact while maintaining the spacing function.
2Reliability
If black matrices are widened to prevent post spacers from scratching the alignment film, then the reliability is improved, but the transmission rate decreases
Solution Approach 1:
By segmenting the protective function into a separate spacer supporting block, the black matrix can remain narrow, allowing more light to pass through the pixel region. This improves transmission rate while the spacer supporting block maintains the reliability of preventing alignment film damage.
3Manufacturing precision
If post spacers are made to contact the substrate to control cell thickness, then the manufacturing precision is improved, but the alignment film may be scratched under external force
Solution Approach 1:
The spacer supporting block serves as a mediator between the post spacer and the substrate. It allows the post spacer to maintain contact for cell thickness control while preventing direct contact between the post spacer end portion and the alignment film, thus avoiding scratching under external forces.
Solution Approach 2:
The spacer supporting block provides beforehand cushioning by being positioned to receive and distribute external forces before they can reach the alignment film. This protective structure is in place before any harmful contact occurs, preventing alignment film scratching while maintaining manufacturing precision.
Data Source
AI summary
The present disclosure discloses a display panel and a display device. The display panel includes a cell defined by a first substrate and a second substrate oppositely arranged with respect to the first substrate, and a plurality of post spacers on the first substrate. The second substrate includes a plurality of sub-pixels, the post spacers include a first post spacer and a second post spacer at one side of the first post spacer away from the sub-pixels. A spacer supporting block protrudes from the second substrate, and enables an end portion of the first post spacer away from the first substrate not to contact with the second substrate when the display panel is subjected to an external force. The end portion of the first post spacer away from the first substrate and the spacer supporting block partially overlap with each other in a direction perpendicular to the second substrate.