Chiplet Display with Multiple Controllers for Passive-Matrix
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Solution Overview
Problem
Conventional display devices face limitations in size and performance due to passive-matrix designs, which suffer from flicker issues and high power requirements, while active-matrix designs using thin-film transistors exhibit non-uniformity and lower electrical performance.
Innovation Solution
The implementation of a display device with separate pixel groups and chiplet column drivers, where each chiplet is fabricated using the lowest cost semiconductor process available, reducing the number of components and connections, and incorporating row and column driver chiplets to independently control pixels, thereby improving performance and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive-matrix design is used, then device complexity is reduced, but image quality deteriorates due to flicker and high power requirements
Solution Approach 1:
The display device is divided into multiple independent pixel groups, with each group controlled by dedicated row and column driver chiplets. This segmentation allows each pixel group to be driven independently, eliminating the flicker inherent in passive-matrix designs while maintaining simpler control structures compared to full active-matrix implementation.
2Reliability
If active-matrix design with thin-film transistors is used, then image quality is improved, but manufacturing precision deteriorates due to non-uniformity
Solution Approach 1:
Driver chiplets serve as intermediary control elements between the external controller and the pixel groups. These chiplets contain the complex transistor logic, while the pixel groups themselves use simpler electrode structures. This intermediary approach provides active-matrix level image quality without requiring thin-film transistors to be fabricated directly on the display substrate, thereby avoiding the uniformity issues inherent in TFT manufacturing.
3Area of stationary object
If larger display sizes are implemented, then area is increased, but device complexity increases due to passive-matrix limitations
Solution Approach 1:
The display is divided into multiple pixel groups that can be independently controlled by separate driver chiplets. This segmentation enables larger display areas to be managed through modular control structures, where each chiplet handles a specific pixel group, avoiding the complexity escalation that would occur with a monolithic passive-matrix approach.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
A display device includes a substrate having a display area; row electrodes formed over the substrate in the display area extending in a row direction and column electrodes formed over the substrate in the display area extending in a column direction different from the row direction, the row and column electrodes overlapping to form pixels; wherein the pixels are divided into two or more separate pixel groups, each pixel group having group row electrodes and separate group column electrodes; two or more spaced column driver chiplets located in the display area, each column driver chiplet uniquely connected to a different pixel group wherein in at least one of the column driver chiplets is located between pixel groups, and the two or more spaced column driver chiplets adapted to drive the group column electrodes of the one pixel group; and one or more row driver(s) connected to the row electrodes.