Organic EL Reflector Height Adjustment for Luminance
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Solution Overview
Problem
In organic EL display elements, increasing the size of pixels to enhance luminance leads to difficulties in achieving high definition due to changes in pixel pitch, necessitating a technique to improve luminance without altering pixel pitch.
Innovation Solution
Adjusting the height of a light reflecting portion, or reflector, for each sub-pixel to optimize light extraction efficiency and luminance, while maintaining consistent pixel pitch, by varying the inclined surface height of the reflector across different sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the size of pixels is increased to improve luminance, then luminance is improved, but pixel pitch changes making it difficult to achieve high definition
Solution Approach 1:
The patent applies local quality by varying the height of light reflecting portions (reflectors) in different regions corresponding to different sub-pixels. Specifically, the reflector height is adjusted locally for each sub-pixel type (red, green, blue) to optimize light extraction efficiency for that specific region, thereby improving overall luminance without requiring uniform enlargement of all pixels which would disrupt pixel pitch consistency and high definition display quality
2Loss of energy
If light extraction efficiency is improved by increasing pixel size, then light emission amount is improved, but device complexity increases
Solution Approach 1:
The patent transitions from two-dimensional pixel enlargement to three-dimensional reflector height adjustment. Instead of increasing pixel size in the planar dimension (which would increase device complexity and reduce definition), the invention utilizes the vertical dimension by varying reflector heights, thereby improving light extraction efficiency through a different spatial dimension without compromising pixel pitch or increasing overall device complexity
Solution Approach 2:
The patent changes the physical parameter of reflector height to optimize light extraction efficiency. By adjusting this geometric parameter differently for each sub-pixel region, the invention achieves improved light emission without requiring fundamental changes to pixel structure or size, thereby avoiding increased device complexity
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 approach allows for improved luminance of each sub-pixel without changing the pixel pitch, enabling high-definition displays by optimizing light extraction and maintaining consistent sub-pixel performance.
Implementation Method 1
a technique disclosed in PTL 1 is known. A technique related to an anode reflector structure which reflects some of light propagated on a member surface using a difference in a refractive index between members is disclosed in PTL 1.
Implementation Method 2
an anode reflector structure which reflects some of light propagated on a member surface
Data Source
AI summary
There is provided a display element, including: a display region including pixels arranged in a two-dimensional form, each of the pixels including a plurality of sub pixels. In each pixel, a height of a light reflecting portion with respect to a light emitting portion is adjusted for each sub pixel.