Active-Matrix Display Row Control via Integrated Shift Registers
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Solution Overview
Problem
Existing matrix-addressed systems, such as flat-panel displays and imaging systems, require a large number of electrical connections between rows and columns, leading to increased costs and complexity, particularly for large displays where thousands of rows and columns are involved.
Innovation Solution
A matrix-addressed system with a row-select circuit that includes a serial shift register with row storage elements equal to or greater than the number of rows, reducing the number of interconnections to the substrate to the number of columns plus one, and utilizing microscopic chiplets or bare integrated circuit dies for row control, which are small enough to be integrated on the substrate without significantly increasing its perimeter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large number of electrical connections are used between rows and columns in matrix-addressed systems, then each pixel can be independently controlled, but the cost and complexity increase significantly
Solution Approach 1:
The patent divides the control function into two parts: a row-select circuit that sequentially selects rows and pixel circuits that are pre-positioned at pixel locations to receive and store data. This segmentation reduces the need for numerous column data lines while maintaining independent pixel control capability through the combination of row selection and localized data storage.
Solution Approach 2:
The patent implements preliminary action by positioning pixel circuits (including storage elements) at their final pixel locations before the display operation begins. This allows data to be transferred to the correct pixel circuit in advance during the row selection phase, eliminating the need for complex real-time routing of data to each pixel and reducing the number of required electrical connections.
2Area of stationary object
If microscopic chiplets or bare integrated circuit dies are used for row control, then integration is improved and perimeter increase is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The pixel circuits are designed to be self-positioning or self-aligning components that can be placed at their designated locations with relatively relaxed precision requirements. The circuits include their own identification or alignment features that enable automatic positioning during assembly, reducing the burden on external placement precision while achieving high integration density.
3Device complexity
If fewer row lines are used by implementing row-select circuitry on substrate, then device complexity is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the row-select circuitry with the display substrate by integrating the row-select circuit elements directly onto the substrate in association with the pixel circuits. This combining of functions reduces the number of external row lines needed while the modular design of the integrated circuits allows for standardized manufacturing processes that mitigate the increased manufacturing complexity.
Data Source
AI summary
An exemplary active-matrix system comprises a system substrate with pixel elements disposed in pixel rows and pixel columns, pixel circuits each controlling two or more of the pixel elements, and row and column lines, at least one of each of which is electrically connected to each pixel circuit. The number of row lines is less than the number of pixel rows, the number of column lines is less than the number of pixel columns, or the number of row lines is less than the number of pixel rows and the number of column lines is less than the number of pixel columns.