Display Pad Bridge Layout for Narrow Non-Display Bezels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in reducing the defect rate while minimizing the width of the non-display area, as the lighting test driver is typically disposed in this area, increasing its size.
Innovation Solution
The display device incorporates a lighting test driver connected to data lines through data bridge lines and pad connection lines, allowing for a separate sub-area to be removed after testing, thereby reducing the non-display area width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lighting test driver is disposed in the non-display area to perform lighting tests and reduce defect rate, then the reliability is improved, but the area of the non-display area increases
Solution Approach 1:
The lighting test driver is extracted from the non-display area and integrated into the display driving circuit located in the display area. This allows the lighting test function to be performed without occupying additional space in the non-display area, thereby resolving the contradiction between maintaining reliability through lighting tests and minimizing the non-display area width.
Solution Approach 2:
The display driving circuit is designed to perform multiple functions: it serves as the normal display driving circuit during operation and as the lighting test driver during testing. This multi-functionality allows the same circuit to perform both display driving and lighting testing without requiring separate dedicated space for the test driver, thus resolving the area expansion issue while maintaining defect reduction capability.
2Area of stationary object
If the lighting test driver is integrated into the display driving circuit, then the area of the non-display area is reduced, but the device complexity increases
Solution Approach 1:
The display driving circuit is designed to perform multiple functions: it serves as the normal display driving circuit during operation and as the lighting test driver during testing. This multi-functionality allows the same circuit to perform both display driving and lighting testing without requiring separate dedicated space for the test driver, thus resolving the area expansion issue while maintaining defect reduction capability.
Solution Approach 2:
The circuit configuration is designed to be dynamically switchable between normal display driving mode and lighting test mode. By using control signals to switch the function of the same circuit, the patent avoids the need for separate fixed circuits, thereby reducing area while managing complexity through dynamic reconfiguration rather than static multi-circuit design.
Data Source
AI summary
A display device includes: a substrate; a circuit layer on a first surface of the substrate; a circuit board on a second surface of the substrate opposite to the first surface; and a display driving circuit on the circuit board to supply data signals of data lines. The substrate includes: a first support layer and a second support layer; and a pad conductive layer between the first support layer and the second support layer, and including signal pads connected to the circuit board, and pad connection lines connected to the signal pads. The circuit layer further includes: data connection lines in a non-display area electrically connected to the data lines; and data bridge lines electrically connecting data pad connection lines of the pad connection lines and the data connection lines to each other. An end of each of the data bridge lines is aligned with an edge of the substrate.