Partition Wall Light Leakage Prevention in Display Devices
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Solution Overview
Problem
Display devices face issues with light leakage between adjacent pixels, which affects the color purity and overall display quality, particularly when using wavelength shift materials like quantum dots or fluorescent materials.
Innovation Solution
A display device design featuring a partition wall with a light-transmitting structure and a higher optical density partition wall portion to block light travel between pixels, combined with color conversion patterns and wavelength band filters to enhance color purity and prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition wall is added to block light between pixels, then light leakage is prevented, but device complexity increases
Solution Approach 1:
The partition wall is segmented into multiple functional portions: a light-shielding member at the bottom, a light-transmitting structure in the middle, and a first partition wall portion at the top. Each portion serves a specific function - the light-shielding member blocks light from below, the light-transmitting structure allows light from color conversion patterns, and the first partition wall portion prevents lateral light leakage between adjacent pixels. This segmentation resolves the contradiction by creating a targeted light blocking solution without unnecessary complexity.
Solution Approach 2:
Different portions of the partition wall have different optical properties tailored to their specific functions. The light-shielding member has high optical density for blocking light, the light-transmitting structure has high transmittance for allowing desired light through, and the first partition wall portion has high optical density for preventing lateral leakage. This local differentiation of properties allows the partition wall to effectively prevent light leakage while maintaining simplicity in each individual portion's design.
2Reliability
If a light-transmitting structure with groove is used in partition wall, then color purity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The light-transmitting structure acts as an intermediary element between the light-shielding member and the first partition wall portion. It provides a bridge that allows light from the color conversion patterns to pass through while maintaining the light-blocking function of the adjacent structures. The groove in the light-transmitting structure is designed to accommodate the color conversion patterns, creating a precise optical path without requiring extremely tight manufacturing tolerances across the entire partition wall assembly.
3Reliability
If partition wall portions with high optical density are added, then light leakage between pixels is blocked, but light transmittance for desired light paths is reduced
Solution Approach 1:
The partition wall implements local quality by concentrating high optical density materials only where light leakage blocking is needed - specifically in the light-shielding member at the bottom and the first partition wall portion at the top. The middle section uses a light-transmitting structure with high transmittance to allow desired light from the color conversion patterns to pass through. This spatial differentiation of optical properties resolves the contradiction between blocking leakage and maintaining transmittance.
Solution Approach 2:
The partition wall is divided into functional segments where light blocking and light transmitting properties are separated into different portions. The light-shielding member and first partition wall portion handle light blocking, while the light-transmitting structure handles light transmission. This segmentation allows each portion to be optimized for its specific function without compromising the overall performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents light leakage between pixels, improving display quality by maintaining color purity and enhancing the visibility of colors displayed by the device.
Implementation Method 1
a first partition wall portion disposed in the groove and having a higher optical density than the light-transmitting structure
Implementation Method 2
A wavelength shift material, such as a quantum dot material or a fluorescent material, shifts the peak wavelength of incident light and thereby emits light having a different color from the incident light
Data Source
AI summary
A display device and a method of manufacturing a display device, the display device having a plurality of pixels defined therein and including: a first substrate; a partition wall disposed on the first substrate to define openings corresponding to the plurality of pixels; and color conversion patterns disposed in the openings. The partition wall includes a light-transmitting structure having a groove and a first partition wall portion disposed in the groove and having a higher optical density than the light-transmitting structure.