Active Matrix Substrate Short Circuit Detection
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Solution Overview
Problem
Existing display devices with touch detection functions face challenges in detecting short circuits between second connection lines that receive the same signal, as the same signal supply masks any short circuit occurrence.
Innovation Solution
The display device incorporates an active matrix substrate with distinct line layers and connection lines, where the space between second connection lines connected to the same common line is wider than those connected to different common lines, and includes dummy lines and switching elements to detect short circuits by supplying different signals, thereby preventing short circuits between second connection lines with the same signal input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same signal is supplied to adjacent second connection lines for simplifying the signal distribution, then the device complexity is reduced, but the ability to detect short circuits is lost
Solution Approach 1:
The patent segments the second connection lines into two groups: those connected to the same common line (C1 or C2) and those connected to different common lines. This segmentation allows different spacing strategies to be applied to different groups, enabling short circuit detection while maintaining signal distribution efficiency.
Solution Approach 2:
The patent applies different spatial characteristics to different regions of the connection lines. Specifically, the space between adjacent second connection lines connected to the same common line is made wider than the space between lines connected to different common lines. This local differentiation enables short circuit detection capability where needed while maintaining compact design elsewhere.
2Manufacturing precision
If the space between second connection lines is reduced to increase line density, then the manufacturing precision is improved, but the risk of short circuit occurrence increases
Solution Approach 1:
The patent implements non-uniform spacing of second connection lines by making the space between lines connected to the same common line wider than the space between lines connected to different common lines. This local quality differentiation reduces short circuit risk in critical areas while maintaining overall line density and manufacturing precision.
Data Source
AI summary
An active matrix substrate includes: first to third lines in first to third line layers, respectively, a signal that is different from a signal supplied to the first lines and the second lines being supplied to the third lines; first connection lines that connect the first lines or the second lines with first terminals; second connection lines that connect the third lines with second terminals; inspection TFTs 61 connected with the second connection lines; and common lines 63, 64. Each of the second connection lines 24c is connected to any one of the common lines through the inspection TFT 61. A space between the adjacent two second connection lines 24c connected to the same common line through the second connection line switching elements is wider than a space between the second connection lines 24c connected to different ones of the common lines, respectively, through the second connection line switching elements.