Display Device Light Blocking Layer for Luminance Uniformity
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Solution Overview
Problem
Display devices face challenges in maintaining display quality and adjusting viewing angles due to luminance deviations caused by differences in pixel opening sizes and electrode levels, particularly in private driving modes where a narrow viewing angle is required.
Innovation Solution
The display device incorporates a light blocking layer with varying distances and pixel electrode levels in specific areas to reduce luminance deviations and enhance viewing angle adjustment, utilizing a substrate with distinct emission and non-emission areas and differently sized pixel openings to control light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light blocking layer is added to control light emission and reduce luminance deviations, then display quality is improved, but device complexity increases
Solution Approach 1:
The light blocking layer is selectively positioned only in the first area where pixel electrodes have different heights, while the second area maintains a conventional structure without the light blocking layer. This localized application addresses luminance deviations only where needed, improving display quality without unnecessarily increasing complexity across the entire device.
Solution Approach 2:
The display area is divided into a first area with varying pixel electrode heights requiring light blocking, and a second area with uniform pixel electrode heights not requiring light blocking. This segmentation allows different structural approaches in different regions, optimizing both display quality and device complexity.
2Manufacturing precision
If pixel electrodes are positioned at different heights to compensate for luminance deviations, then display quality is improved, but ease of manufacture deteriorates
Solution Approach 1:
Different pixel electrode heights are implemented only in the first area where luminance compensation is needed, while the second area maintains uniform electrode heights for easier manufacturing. This localized differentiation achieves luminance uniformity without requiring complex multi-level electrode structures across the entire display.
Solution Approach 2:
The display is segmented into regions with different electrode height requirements, allowing standardized manufacturing processes to be used in the second area while applying specialized techniques only in the first area where luminance compensation is necessary.
3Loss of information
If viewing angle is narrowed for private driving mode, then information security is improved, but adaptability deteriorates
Solution Approach 1:
The light blocking layer with varying distances creates dynamic light control that adapts to different viewing conditions. By positioning the light blocking layer at different distances from pixel electrodes of different colors, the device optimizes viewing angle for private driving mode while maintaining color accuracy and luminance uniformity across the display.
Solution Approach 2:
The distances from pixel electrodes to the light blocking layer are varied as a key parameter to control light emission characteristics. By adjusting these distances differently for red, green, and blue pixels, the device achieves narrow viewing angle for security while maintaining color balance and display quality.
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
This configuration improves display quality by minimizing luminance deviations and facilitating easier viewing angle adjustment, particularly in private driving modes where a narrow viewing angle is necessary, thereby preventing exposure of personal information.
Implementation Method 1
a light blocking layer disposed in the first area on the encapsulation layer and defining emission openings corresponding to the first to third light emitting elements
Data Source
AI summary
A display device includes: a substrate including a first area including an emission area and a non-emission area; first to third light emitting elements disposed in the first area; a pixel defining layer disposed in the non-emission area; an encapsulation layer disposed on the first to third light emitting elements; and a light blocking layer disposed in the first area. At least one of a first distance from an upper surface of a pixel electrode of the first light emitting element to a lower surface of the light blocking layer and a second distance from an upper surface of a pixel electrode of the second light emitting element to the lower surface of the light blocking layer is different from a third distance from an upper surface of a pixel electrode of the third light emitting element to the lower surface of the light blocking layer.