Redundancy Cell Matrix for Display Device Defect Compensation
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Solution Overview
Problem
Display devices face issues with defective cells in their cell matrices, leading to image defects, as existing technologies lack effective redundancy mechanisms to replace and compensate for faulty cells without compromising image quality.
Innovation Solution
A display device incorporating a cell matrix with redundancy integrated circuits that can selectively replace bad cells using redundancy cells connected through specific row and column lines, with memory elements determining which cells to replace based on stored values, ensuring continuous image output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy cells and connection lines are added to replace defective cells, then reliability is improved, but device complexity increases
Solution Approach 1:
The redundancy integrated circuit is designed to perform multiple functions: it serves as both a normal cell during operation and as a replacement for defective cells. The same redundancy cell can replace defective cells from different cell lines (first or second cell line) based on defect detection, eliminating the need for separate backup circuits for each cell line and reducing overall system complexity.
Solution Approach 2:
Connection lines are introduced as intermediary elements that enable flexible routing between the redundancy integrated circuit and multiple cell lines. These connection lines act as mediators that can dynamically connect the redundancy cell to either the first or second cell line based on which cell is defective, allowing a single redundancy cell to serve multiple purposes without requiring complex switching mechanisms.
2Adaptability or versatility
If more connection lines are used to connect redundancy cells to multiple cell lines, then adaptability is improved, but device complexity increases
Solution Approach 1:
The connection lines are designed with multi-functionality, where each connection line can serve different routing purposes depending on the defect location. The same connection line infrastructure supports replacement of cells from both the first and second cell lines, reducing the total number of dedicated connection lines needed compared to having separate backup systems for each cell line.
Solution Approach 2:
The redundancy integrated circuit and connection lines are pre-configured during manufacturing to potential replacement scenarios. The system is prepared in advance with established connection paths that can be activated based on defect detection, eliminating the need for complex real-time routing decisions and reducing operational complexity.
Data Source
AI summary
A display device includes: a cell matrix including a first cell line and a second cell line, wherein the first cell line includes first cells sharing first row lines, and the second cell line includes second cells sharing second row lines; a redundancy integrated circuit including a redundancy cell line including redundancy cells, wherein the redundancy cells share a third row line and are connected to the first and second cells through a plurality of column lines and a plurality of connection lines; and a display driver integrated circuit (DDI) configured to replace the first cell line or the second cell line with the redundancy cell line through the first row lines, the second row lines, and the third row line based on whether the first and second cell lines include a bad cell.