Pixel Circuit Lens Pattern for Display Optical Efficiency
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Solution Overview
Problem
Current display devices face challenges in enhancing optical efficiency due to limitations in the design and integration of light emitting elements, particularly in achieving effective light reflection and distribution.
Innovation Solution
Incorporating a lens pattern unit under the light emitting element, which includes a plurality of taper portions and a metal layer, to improve optical efficiency by reflecting incident light irregularly and enhancing light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens pattern unit is added under the light emitting element to improve optical efficiency, then light reflection and distribution are enhanced, but device complexity increases
Solution Approach 1:
The lens pattern unit is integrated into the pixel circuit layer by forming it concurrently with the organic layer using the same coating and photolithography processes. This merging approach adds the optical enhancement function without requiring separate manufacturing steps, thereby improving optical efficiency while minimizing increases in device complexity and manufacturing complexity
2Manufacturing precision
If the lens pattern is formed by separate manufacturing steps, then optical precision is improved, but productivity decreases
Solution Approach 1:
The lens pattern is formed concurrently with the organic layer in the same manufacturing sequence using identical coating and photolithography steps. This integration maintains manufacturing precision because the lens pattern is formed with the same precise processes used for the organic layer, while simultaneously improving productivity by eliminating separate manufacturing steps and reducing overall process complexity
Solution Approach 2:
The organic layer serves dual functions: as the functional organic material layer and as the medium in which the lens pattern is formed. This multi-functionality allows the lens pattern to be created using the existing organic layer processing infrastructure, maintaining precision while improving manufacturing efficiency and yield
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 improves optical efficiency and viewing angle characteristics of display devices by concurrently forming the lens pattern with other structures, reducing processing costs and increasing yield.
Implementation Method 1
the lens pattern may include an uneven pattern, and the uneven pattern may be configured to reflect an incident light irregularly
Implementation Method 2
the display element layer may further include an insulating layer covering the first electrode, the second electrode, and the organic layer, and a refractive index of the insulating layer may be greater than a refractive index of the organic layer
Data Source
AI summary
A display device includes: a base layer; a pixel circuit layer on the base layer; and a display element layer on the pixel circuit layer. The pixel circuit layer includes a lens pattern at a recess between the display element layer and the base layer, the display element layer includes a light emitting element, and at least a portion of the light emitting element overlaps with the lens pattern.