Display Device Blue Subpixel Area Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional top emission type organic EL display devices suffer from external light reflection, which affects the viewer's experience and color accuracy, and the use of circularly polarizing plates to mitigate this issue reduces luminance.
Innovation Solution
The display device incorporates a matrix of pixels with sub-pixels having differently sized effective light emission areas for red, green, and blue color filters, where the blue color filter's area is at least 1.15 times larger than the others, and strategically positioned to minimize light reflection without using a circularly polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circularly polarizing plate is provided on the outermost surface to suppress external light reflection, then the reflection problem is solved, but the luminance is decreased
Solution Approach 1:
The patent applies local quality by making the effective light emission areas of different sub-pixels non-uniform. Specifically, the blue sub-pixel has a larger effective light emission area than the red and green sub-pixels. This local variation in area size allows selective control of light emission from different regions, suppressing external light reflection while maintaining overall luminance without requiring a circularly polarizing plate.
2Object-affected harmful factors
If the effective light emission area of blue sub-pixel is increased to be at least 1.15 times larger than red and green sub-pixels, then external light reflection is suppressed, but the pixel structure becomes asymmetric
Solution Approach 1:
The patent deliberately introduces asymmetry into the pixel structure by making the effective light emission area of the blue sub-pixel at least 1.15 times larger than those of the red and green sub-pixels. This asymmetric design is strategically positioned to minimize external light reflection while maintaining acceptable color balance and luminance characteristics.
3Adaptability or versatility
If different area size ratios are used for red, green, and blue pixels to enlarge color reproduction range, then color versatility is improved, but the device complexity increases
Solution Approach 1:
The patent changes the area size parameter of the effective light emission regions in different sub-pixels. Specifically, the blue sub-pixel's effective light emission area is increased to at least 1.15 times that of the red and green sub-pixels. This parameter change serves dual purposes: it suppresses external light reflection and simultaneously enlarges the color reproduction range, while the complexity increase is minimal and acceptable.
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 effectively suppresses external light reflection at the pixel electrode or glass substrate surface, maintaining luminance while improving color accuracy by adjusting the area sizes and positions of the color filters.
Implementation Method 1
The sealing substrate includes a red color filter, a blue color filter and a green color filter respectively included in the plurality of sub pixels
Implementation Method 2
an EL layer provided above the openings
Data Source
AI summary
A display device includes a pixel area. The plurality of pixels, each includes pixel electrodes; banks; an EL layer; a counter electrode; and a sealing substrate. The plurality of pixels each include a plurality of sub pixels demarcated by the banks; the sealing substrate includes red, blue and green color filters; the plurality of sub pixels each include an effective light emission area and a light-blocked area; the effective light emission area of the blue color filter has an area size larger than that of each of the effective light emission area of the red and green color filter; and an effective light emission area of one sub pixel adjacent to the sub pixel including the blue color filter is located at a position closest, in the one sub pixel, to the light-blocked area of the sub pixel including the blue color filter.