Chiplet Display With Passive-Matrix Controllers
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Solution Overview
Problem
Conventional passive-matrix display designs are limited in size and number of light-emitting elements, while active-matrix designs using thin-film transistors suffer from lower electrical performance and complex substrates, leading to non-uniformity and inefficiencies in display control.
Innovation Solution
A display device with a substrate featuring separate pixel groups, each controlled by unique column driver chiplets and row drivers, reducing the number of components and connections, and allowing for lower-cost semiconductor fabrication, thereby improving performance and reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive-matrix control is used, then device complexity is reduced, but the number of light-emitting elements and display size are limited
Solution Approach 1:
The display is divided into multiple independently controllable pixel groups (first pixel group, second pixel group, etc.), each driven by separate row and column electrodes. This segmentation allows the display to exceed the traditional passive-matrix limits while maintaining simple control structures within each group.
Solution Approach 2:
The patent extends the passive-matrix approach into a new dimension by organizing pixels into multiple groups that can be independently addressed. Instead of limiting the display to a single large matrix, the invention creates a multi-group structure that effectively increases the controllable area without proportionally increasing complexity.
2Area of stationary object
If active-matrix control with thin-film transistors is used, then display size can be increased, but manufacturing complexity and substrate complexity increase leading to non-uniformity
Solution Approach 1:
The patent extracts the active control elements (thin-film transistors) from the substrate and relocates them to separate driver chips. This removes the complexity and non-uniformity issues associated with integrating transistors directly on the flexible substrate, while still enabling large display sizes through the multi-pixel-group architecture.
Solution Approach 2:
Driver chips serve as intermediaries between the control system and the pixel groups. These separate driver circuits provide the necessary active control functionality without requiring complex transistor integration on the display substrate itself, thereby reducing substrate complexity and improving manufacturing uniformity.
3Area of stationary object
If more rows are included in passive-matrix display, then display area increases, but flicker becomes perceptible
Solution Approach 1:
By dividing the display into multiple pixel groups that can be independently controlled and refreshed, the patent enables higher effective refresh rates for each group. This segmentation allows the display to cover a larger area without perceptible flicker, as each smaller group can be updated more frequently than a single large matrix could be refreshed.
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 enables larger display sizes with improved performance by reducing the number of components and connections, eliminating flicker, and allowing for the use of flexible substrate materials, while lowering manufacturing costs and enhancing image quality.
Implementation Method 1
Light is emitted from a pixel when current passes through the light-emitting material. The frequency of the emitted light is dependent on the nature of the material used.
Data Source
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.