Display Apparatus Load Matching Capacitors Luminance Uniformity
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Solution Overview
Problem
Display apparatuses with non-rectangular display areas face issues with luminance uniformity due to structural and manufacturing variations, leading to deteriorated display quality.
Innovation Solution
The display apparatus includes a substrate with a lower conductive layer, a buffer layer, an active pattern, and conductive layers forming load matching capacitors to minimize variations in thin film transistor characteristics and reduce static electricity damage, while using a protective pattern to safeguard the active layer and forming load matching capacitors using the lower conductive layer to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display apparatus has different sized areas, then the display area can be optimized for specific applications, but luminance uniformity deteriorates due to structural and manufacturing variations
Solution Approach 1:
The patent applies local quality by configuring different-sized pixel areas (first pixel area and second pixel area with different sizes) to optimize display performance for specific applications. Each area can be tailored with appropriate pixel densities and arrangements, allowing the display to adapt to different viewing requirements while maintaining overall luminance uniformity through compensated design parameters
2Ease of manufacture
If the active layer is directly exposed, then manufacturing process is simplified, but the thin film transistor becomes vulnerable to static electricity damage
Solution Approach 1:
The patent implements beforehand cushioning by introducing a protective pattern layer that covers the active layer before final device completion. This protective layer acts as a cushion against static electricity damage during manufacturing and operation, allowing the active layer to remain accessible for manufacturing while being protected when needed
3Device complexity
If load matching capacitors are formed using the active layer, then device complexity is reduced, but short circuits may occur between gate conductive layer and active layer
Solution Approach 1:
The patent resolves the short circuit risk by forming load matching capacitors in another dimensional arrangement - using the lower conductive layer as one electrode and a separate conductive layer above the active pattern as the other electrode. This spatial separation in the vertical dimension eliminates direct contact between the gate conductive layer and active layer, preventing short circuits while maintaining capacitor functionality
4Productivity
If manufacturing precision is relaxed, then production cost decreases, but luminance uniformity across different areas deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully adjusting and optimizing key parameters such as electrode dimensions, spacing, and material properties in the load matching capacitor structure. By modifying these parameters, the design compensates for manufacturing variations and achieves improved luminance uniformity across different pixel areas without requiring excessively tight manufacturing tolerances
Data Source
AI summary
A display apparatus includes a substrate; a lower conductive layer including a protective pattern and an auxiliary conductive pattern on the substrate; a buffer layer on the lower conductive layer; an active pattern on the buffer layer and overlapping the protective pattern; a first insulation layer on the active pattern; and a first conductive layer on the first insulation layer, the first conductive layer including a gate electrode overlapping the active pattern and a load matching line overlapping the auxiliary conductive pattern.