Display Device Varying Subpixel Clearance to Stabilize White Balance
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Solution Overview
Problem
Display devices using self-luminous elements face challenges with view-angle dependence of chromaticity, leading to disruptions in white balance and color changes when viewed from different angles due to variations in light extraction efficiency and emission region dimensions.
Innovation Solution
A display device design featuring a pair of substrates with a light blocking film on one and self-luminous elements on the other, where each self-luminous element has a unique clearance from the light blocking film's opening, varying the ratio of light blocked area to emission area, thereby reducing luminance differences and chromaticity changes across colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a resonator effect or interference effect is used to improve light extraction efficiency, then light extraction efficiency is improved, but view angle characteristic varies between colors causing white balance disruption
Solution Approach 1:
The patent applies different clearances to different colored self-luminous elements (red, green, blue) relative to the light blocking film. Each color has a specifically designed clearance value that compensates for its unique view angle characteristics, thereby maintaining white balance across different viewing angles while preserving light extraction efficiency enhancements
2Ease of manufacture
If uniform clearance is provided for all self-luminous elements, then manufacturing is simplified, but luminance reduction due to light blocking varies causing chromaticity change at oblique viewing angles
Solution Approach 1:
The patent specifies different clearance dimensions for different colored self-luminous elements relative to the light blocking film openings. This local differentiation in clearance values compensates for color-specific light blocking effects at oblique angles, maintaining chromaticity stability while remaining compatible with standard manufacturing processes
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 design effectively reduces view-angle dependence of chromaticity for white and intermediate colors, maintaining color consistency and improving image quality by adjusting luminance reduction due to light blocking, thus minimizing color drift.
Implementation Method 1
a plurality of self-luminous elements provided on the other of the pair of substrates, each element having an emission region facing each of the openings
Implementation Method 2
a light blocking film provided on one of the pair of substrates while having a plurality of openings
Data Source
AI summary
A display device is provided, in which view-angle dependence of chromaticity of white or an intermediate color may be reduced. The display device includes a pair of opposed substrates, a light blocking layer provided on one of the pair of substrates while having a plurality of openings, and a plurality of self-luminous elements provided on the other of the pair of substrates, each of the self-luminous elements having an emission region facing each of the openings, and having an emission color different from an emission color of another element, at least one self-luminous element being different from other self-luminous elements in clearance in a display plane direction from an end of the emission region to an opening of the light blocking film.