Color Filter Layout in Light-Emitting Displays for Bending Endurance
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Solution Overview
Problem
Existing display devices face challenges in improving reliability, particularly in terms of bending endurance and service life, while also requiring reduced process time and improved display quality.
Innovation Solution
A light emitting device with a unique configuration of color filter layers and a method of integrating an anti-reflection layer directly on the insulating layer, reducing overall thickness and bending stress, thereby enhancing reliability and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device structure is used, then the manufacturing process is simpler, but the bending endurance and service life are poor
Solution Approach 1:
The display device is segmented into distinct functional layers including a substrate, pixel circuit, light-emitting unit, first color filter layer, and second color filter layer. Each layer is independently configured with specific properties, allowing the structure to be optimized for bending endurance while maintaining manufacturing feasibility through modular assembly
Solution Approach 2:
The patent employs composite material structures by combining multiple color filter layers with different properties. The first color filter layer and second color filter layer are positioned at different locations and have different colors, creating a composite structure that enhances overall reliability and bending endurance while managing stress distribution
2Duration of action of stationary object
If the display device structure is simplified, then manufacturing is easier, but the service life is reduced
Solution Approach 1:
The color filter layers are pre-configured with specific positions and properties before final assembly. The first color filter layer is disposed at a first location and the second color filter layer at a second location, with their optical properties predetermined to ensure long service life while streamlining the manufacturing process through pre-prepared components
Solution Approach 2:
Different regions of the display device are assigned different qualities and functions. The first color filter layer and second color filter layer have different colors and are positioned at different locations to optimize local optical performance and stress distribution, thereby extending service life without requiring complex manufacturing processes across the entire device
3Reliability
If the overall thickness is reduced, then bending stress is reduced and reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The patent optimizes the thickness parameter by configuring the first color filter layer and second color filter layer with different thicknesses. This dimensional optimization reduces overall device thickness and bending stress, improving reliability while the layered structure manages the complexity through systematic design
Data Source
AI summary
A light emitting device includes a substrate, a pixel circuit disposed on the substrate, a light-emitting unit disposed on the pixel circuit, and a first color filter layer and a second color filter layer disposed on the pixel circuit. The pixel circuit includes a first transistor and a second transistor. The light-emitting unit includes a portion corresponding to a first light-emitting region and an another portion corresponding to a second light-emitting region. The second color filter layer is different from the first color filter layer in color. In a cross-section view, the first light-emitting region corresponds to a first portion of the first color filter layer and the first transistor, and the second light-emitting region corresponds to a second portion of the second color filter layer and the second transistor. A projection length of the first portion is different from a projection length of the second portion.