Tile Display Gate Voltage Layout to Prevent Edge Short Circuits
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Solution Overview
Problem
Inorganic light emitting diode elements experience degraded image quality due to varying light wavelengths with driving current, and there is a risk of short-circuit defects at the edges of substrates in display devices.
Innovation Solution
A display device design featuring a substrate with a transistor array layer, flip chip type micro light emitting diodes, and an anti-ESD pattern layer to prevent short-circuits, along with a gate voltage supply system that avoids edge exposure, using multiple gate voltage lines and auxiliary lines to maintain consistent voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a gate voltage supply line is disposed adjacent to the edge of the substrate to reduce wiring length, then the device complexity is reduced, but short-circuit defects occur due to exposure at the edge
Solution Approach 1:
The gate voltage auxiliary line extends in a direction crossing the gate voltage supply line (perpendicular orientation), creating a two-dimensional routing pattern that prevents both lines from being exposed at the same edge location, thereby eliminating the short-circuit risk while maintaining wiring efficiency
Solution Approach 2:
The first gate voltage auxiliary line acts as an intermediary routing element that connects the gate voltage supply line to the gate driver through a path that does not expose both lines simultaneously at the substrate edge, preventing direct contact and potential short-circuits
2Ease of operation
If inorganic light emitting diode elements are driven with varying current to adjust luminance, then the ease of operation is improved, but the image quality deteriorates due to wavelength variation
Solution Approach 1:
The patent applies different voltage levels (first gate level voltage and second gate level voltage) to different gate drivers, enabling independent optimization of driving conditions for different regions or types of light emitting elements, thereby maintaining consistent light wavelength and image quality while allowing luminance adjustment
Data Source
AI summary
A display device, and a tile-shaped display device including the same are provided. The display device includes a transistor array layer on a first surface of a substrate, and a plurality of light emitting elements on the transistor array layer. The transistor array layer includes a plurality of pixel drivers and two or more gate drivers in a circuit area of a display area, a first gate voltage supply line around the circuit area, and two or more first gate voltage auxiliary lines connected between the first gate voltage supply line and each of the two or more gate drivers. One end of each of the two or more first gate voltage auxiliary lines is spaced from an edge of the substrate adjacent to the first gate voltage supply line than the first gate voltage supply line.