Chiplet Sub-pixel Control for Display Uniformity
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Solution Overview
Problem
Conventional active-matrix displays using thin-film transistor circuits made from amorphous or polysilicon suffer from non-uniformity and lower performance, affecting image quality and color mixing in flat-panel display devices.
Innovation Solution
The use of independent chiplets, formed on crystalline silicon substrates, are placed over the display substrate to control sub-pixels, allowing for improved color mixing and uniformity by distributing control across multiple chiplets for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin-film transistor circuits made from amorphous or polysilicon are used to control sub-pixels, then device complexity is reduced and ease of manufacture is improved, but manufacturing precision deteriorates resulting in non-uniformity and lower performance
Solution Approach 1:
The patent divides the display device into separate modules: a first substrate containing pixel circuits and a second substrate containing chiplet circuits. This segmentation allows each substrate to be optimized independently - the first substrate can use thin-film transistors for ease of manufacture while the second substrate uses high-precision chiplets for manufacturing precision, resolving the contradiction between ease of manufacture and manufacturing precision.
2Reliability
If sub-pixels are closely spaced to improve color mixing, then color representation is improved, but device complexity increases due to tighter integration requirements
Solution Approach 1:
The patent moves the control circuits from the same plane as the pixel circuits to a separate dimension by using a second substrate positioned adjacent to the first substrate. This allows sub-pixels to be closely spaced for improved color mixing while the control complexity is managed in a separate dimensional layer through the chiplet circuits on the second substrate.
Data Source
AI summary
A display device includes a substrate, a plurality of pixels formed over the substrate, each pixel including two or more sub-pixels, the plurality of pixels defining a display area, and a plurality of chiplets located over the substrate in the display area, each chiplet controlling sub-pixels of at least two adjacent pixels.