Display Bank Layer Layout to Reduce Sub-Pixel Light Cross-Talk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flat panel display apparatuses suffer from optical performance defects due to excessive distance between bank layers, causing light beams from light-emitting devices to enter adjacent sub-pixels, resulting in dull defects.
Innovation Solution
A manufacturing method involving a color conversion substrate with a first and second bank layer, where the first bank layer has openings for color conversion patterns and the second bank layer has overlapping openings, reducing the distance between bank layers by using a second encapsulation layer, thereby minimizing light cross-talk between sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the distance between the first bank layer and the second bank layer is increased, then the manufacturing process becomes easier and the structure more stable, but light beams from light-emitting devices enter adjacent sub-pixels causing dull defects and degrading optical performance
Solution Approach 1:
The patent introduces a horizontal offset between the first bank layer and the second bank layer, shifting the alignment from purely vertical stacking to a staggered configuration. This dimensional change allows light to be blocked at multiple horizontal positions, preventing cross-subpixel contamination while maintaining adequate vertical spacing for manufacturing stability.
Solution Approach 2:
The patent introduces a light-blocking layer as an intermediary element between the first and second bank layers. This intermediate layer provides additional light blocking capability, ensuring that even with increased vertical distance, light from one subpixel cannot reach adjacent subpixels through the bank layer openings.
2Reliability
If the distance between the first bank layer and the second bank layer is reduced, then light cross-talk between sub-pixels is minimized, but the manufacturing complexity increases and structural stability decreases
Solution Approach 1:
Instead of reducing vertical distance, the patent utilizes horizontal offset between bank layers to achieve light blocking. This dimensional approach maintains simple vertical stacking for manufacturing while adding horizontal staggering to prevent light cross-talk, avoiding increased device complexity.
Solution Approach 2:
The light-blocking layer serves as an intermediary that enables effective light blocking without requiring reduced distance between bank layers. This mediator allows the system to maintain larger vertical spacing for manufacturing ease while achieving the optical performance goal through the intermediate blocking function.
3Stability of the object's composition
If the distance between the first bank layer and the second bank layer is increased, then structural stability is improved, but light beams emitted by light-emitting devices in different sub-pixel regions enter adjacent sub-pixels causing dull defects
Solution Approach 1:
The patent compensates for reduced light blocking effectiveness at larger vertical distances by introducing horizontal offset between bank layers. This dimensional adjustment ensures that even with increased spacing for structural stability, the staggered configuration blocks light from entering adjacent subpixels, eliminating the harmful light cross-talk effect.
Solution Approach 2:
The light-blocking layer acts as an intermediary that provides additional light blocking capability, allowing the system to maintain larger vertical distances for structural stability while preventing light cross-talk through the intermediate blocking function provided by this layer.
Data Source
AI summary
A display apparatus includes a color filter substrate, a first encapsulation layer, a first bank layer, color conversion patterns, a second encapsulation layer, a second bank layer, a driving circuit substrate, and light-emitting devices. The first encapsulation layer is disposed on the color filter substrate. The first bank layer is disposed on the first encapsulation layer. The color conversion patterns are disposed in first openings of the first bank layer. The second encapsulation layer is disposed on the first bank layer and the color conversion patterns. The second bank layer is disposed on the second encapsulation layer. The driving circuit substrate is disposed opposite to the color filter substrate. The light-emitting devices are disposed on and electrically connected to the driving circuit substrate. The driving circuit substrate and the second bank layer are spaced from each other by a distance in a direction perpendicular to the driving circuit substrate.