Display Device Light Blocking Member and Spacer Design
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Solution Overview
Problem
In liquid crystal displays (LCDs), accurate alignment between pixel electrodes, thin film transistors (TFTs), and light blocking members is difficult when these components are formed in different display panels, leading to alignment errors and increased manufacturing costs due to the need for masks with different transmittances to adjust spacer heights for various color filters.
Innovation Solution
A display device design where TFTs, color filters, and light blocking members are formed on the same substrate, with spacers and a main light blocking portion, and a furrow between the spacer and the main light blocking portion, allowing for easier adjustment of spacer heights and increased area ratio to reduce smudges from external pressure without increasing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrodes, TFTs, and light blocking members are formed in different display panels, then manufacturing flexibility is improved, but alignment precision deteriorates
Solution Approach 1:
The patent merges the formation of pixel electrodes, TFTs, and light blocking members into the same display panel instead of separating them into different panels. This integration ensures that all components are formed on a common substrate, eliminating alignment errors between separate panels while maintaining manufacturing flexibility through a unified fabrication process.
2Manufacturing precision
If masks with different transmittances are used to adjust spacer heights for various color filters, then spacer height precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by forming spacers with different heights in different regions corresponding to different color filters (RGB) using a single mask. The spacer height is locally adjusted according to the specific color filter location, allowing precise compensation for color filter thickness variations without requiring multiple masks with different transmittances, thereby reducing manufacturing cost while maintaining spacer height precision.
3Manufacturing precision
If sub-spacers are provided for all color filters to adjust height differences, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The patent uses local quality by providing sub-spacers only in specific regions where height compensation is needed, rather than uniformly across all color filters. This selective placement of sub-spacers in certain RGB regions allows precise alignment correction while minimizing the overall number of spacers and reducing structural complexity compared to a universal sub-spacer approach.
Data Source
AI summary
A display device includes a first substrate and a second substrate facing each other, a first thin film transistor (“TFT”) disposed on the first substrate, a second TFT disposed on the first substrate, a first color filter disposed on the first TFT and a periphery thereof, a second color filter disposed on the second TFT and a periphery thereof and representing a different color from the first color filter, and a light blocking member disposed on the first and second color filters where the light blocking member includes a first spacer disposed on the first TFT and the first color filter, a second spacer disposed on the second TFT and the second color filter, a main light blocking portion disposed in peripheries of the first and second spacers, and a furrow disposed between the second spacer and the main light blocking portion.