Display Unit Light-Emitting Surface Height vs Drive Device
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Solution Overview
Problem
In display units with integrated light-emitting devices and driving ICs, the narrow spacing between these components leads to vignetting of light emitted by the light-emitting device, resulting in reduced viewing angles and degraded display performance as the light is blocked by the driving IC, especially during downsizing efforts.
Innovation Solution
The display unit design positions the end of the light-emitting surface of the light-emitting device higher than the upper end of the drive device, utilizing a first wiring layer for electrical coupling, and incorporates various structural features such as insulating films, high-refractive-index layers, and light-shielding elements to minimize vignetting and maintain performance during downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the interval between the light-emitting device and the driving IC is narrowed for downsizing, then the device size is reduced, but the light emitted from the light-emitting device is vignetted (blocked) by the driving IC, causing viewing angle to narrow and display performance to degrade
Solution Approach 1:
The patent positions the light-emitting surface at a higher vertical level than the drive device, creating a height difference that allows light to escape without being blocked. This spatial arrangement in the vertical dimension resolves the vignetting problem while maintaining horizontal downsizing.
Solution Approach 2:
The patent introduces a light-shielding film as an intermediary element that selectively blocks light paths. By strategically placing this film, it prevents light from reaching areas where it would cause vignetting or interference, thus controlling light distribution without requiring larger device dimensions.
2Device complexity
If the light-emitting surface is positioned at the same level as the drive device, then the device structure is simplified, but light emitted from the light-emitting device is blocked by the drive device, resulting in reduced viewing angle
Solution Approach 1:
The patent resolves the contradiction by utilizing the vertical dimension to position the light-emitting surface higher than the drive device. This height difference allows light to propagate freely without being blocked by the drive device structure, thereby maintaining a wide viewing angle while keeping the horizontal footprint compact.
Solution Approach 2:
The patent applies local quality by creating a specific height difference only at the light-emitting surface region, while other parts of the device maintain their original structure. This localized modification optimizes light emission without requiring complete restructuring of the entire device.
Data Source
AI summary
A display unit is provided, on a substrate, with a first wiring layer and a device section. The device section has a plurality of pixels. The device section includes, in each of the pixels, a light-emitting device section and a drive device. The light-emitting device section includes a light-emitting device and a light-emitting surface. The drive device drives the light-emitting device section and is electrically coupled to the light-emitting device section through the first wiring layer. An end of the light-emitting surface of the light-emitting device section is disposed at a position as high as an upper end of the drive device, or at a position higher than the upper end.