Display Panel Lens Sheet Partitions Block Reflected Light
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Solution Overview
Problem
Conventional display panel apparatuses with organic electroluminescence (EL) devices suffer from reduced contrast due to total reflection of light from the organic luminescent layer onto the sealing glass, causing color mixture when adjacent luminescent regions emit different colors.
Innovation Solution
Incorporating a lens sheet with lenses corresponding to each pixel unit and partitions that block light reflected on the glass substrate from entering adjacent luminescent regions, ensuring that light emitted from one color does not mix with adjacent colors by using first and second partitions that are higher than the lens height and strategically positioned to intercept light traveling between pixel units emitting different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microlens is formed on the sealing glass to increase light extraction efficiency, then the extraction efficiency of light from the organic luminescent layer is improved, but light completely reflects on the sealing glass and enters adjacent luminescent regions causing color mixture and lowered image contrast
Solution Approach 1:
The patent divides the sealing glass surface into distinct regions by forming grooves between adjacent pixel units. These grooves act as partitions that segment the light paths, preventing light from one pixel unit from reflecting into adjacent pixel units. This segmentation maintains the microlens light extraction function while eliminating the harmful light mixing effect.
Solution Approach 2:
The groove structure serves as an intermediary element between the microlenses and the sealing glass. It intercepts the reflected light before it can enter adjacent luminescent regions, acting as a light-blocking barrier that mediates between the light extraction function and the contrast requirement.
2Illumination intensity
If the refractive index of the microlens is set higher than the insulating liquid (n1>n2) to improve light extraction, then extraction efficiency increases, but total reflection causes color mixture between adjacent regions
Solution Approach 1:
The patent converts the harmful total reflection effect into a beneficial directional control mechanism. By designing grooves with specific geometric parameters, the reflected light is channeled in controlled directions that return it to its source pixel unit rather than allowing it to scatter into adjacent regions. This transforms the harmful reflection into a useful light-guiding feature.
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 significantly improves image contrast by preventing light from one luminescent region from entering adjacent regions, thereby reducing color mixture and enhancing light extraction efficiency.
Implementation Method 1
a lens sheet interposed between the organic EL unit and the glass substrate and having (i) a lens provided corresponding to each of the pixel units
Implementation Method 2
the first partition being at least higher than a height of the lens; and a second partition provided (i) on a side of the base opposite to the side on which the lens is provided
Data Source
AI summary
A display panel apparatus includes pixels, each including an organic luminescent layer between first and second electrodes. A glass substrate is above the second electrode. A lens sheet is between the pixels and the glass substrate and includes a lens corresponding to each of the pixels and a base from which the lens protrudes. A first partition is between the glass substrate and the lens sheet on a first side of the base from which the lens protrudes for partitioning, between the glass substrate and the lens sheet, a gap between the lens of each of the pixels. A second partition is between the organic electro-luminescence unit and the lens sheet on a second side of the base opposite the first side from which the lens protrudes for partitioning, between the organic electro-luminescence unit and the lens sheet, the gap between the lens of each of the pixels.