OLED Lighting Test Transistor Gate Electrode Homogeneity
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Solution Overview
Problem
OLED displays with non-uniform gate electrode shapes in lighting test transistors suffer from reduced luminance and accuracy in lighting tests due to varying antenna ratios, leading to inconsistent brightness across the display.
Innovation Solution
Designing lighting test transistors with gate electrodes of the same shape ensures uniformity and accuracy by maintaining consistent antenna ratios, enhancing the uniformity of luminance and accuracy of the lighting test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gate electrodes in lighting test transistors have different shapes, then the device complexity is reduced and manufacturing is easier, but the luminance uniformity and lighting test accuracy deteriorate
Solution Approach 1:
The patent applies homogeneity by making all gate electrodes in the lighting test transistors have the same shape and size. This ensures that the antenna ratio (the ratio of gate electrode area to active layer area) is uniform across all lighting test transistors, which directly improves the uniformity of luminance during lighting tests and eliminates brightness inconsistencies across the display panel.
2Device complexity
If gate electrodes in lighting test transistors have different shapes, then the device structure becomes simpler, but the lighting test accuracy deteriorates
Solution Approach 1:
The patent applies homogeneity by standardizing the gate electrode shapes across all lighting test transistors. This uniformity ensures that the antenna ratio is consistent, which is critical for accurate lighting tests. By eliminating variations in gate electrode geometry, the patent ensures that all pixels are tested under identical conditions, thereby improving measurement precision without significantly increasing device complexity.
3Ease of manufacture
If gate electrodes in lighting test transistors have different shapes, then the manufacturing process becomes less complex, but the brightness consistency deteriorates
Solution Approach 1:
The patent applies homogeneity by ensuring all gate electrodes have identical shapes and dimensions. This uniformity in gate electrode geometry results in a consistent antenna ratio across all lighting test transistors, which directly controls the amount of light emitted during testing. Consequently, all pixels exhibit consistent brightness levels during lighting tests, eliminating the brightness inconsistency problem that would arise from varied gate electrode shapes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution increases the uniformity and accuracy of the lighting test in OLED displays by ensuring all gate electrodes have the same shape, thereby improving the consistency of brightness across the display.
Implementation Method 1
In OLEDs, electrons and holes are injected into an organic thin layer through a cathode and an anode, and then recombined in the organic thin layer to generate excitons, thereby light of a certain wavelength can be emitted.
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a substrate including a pixel region including a plurality of pixels. A plurality of lighting test transistors is formed in a peripheral region surrounding the pixel region and electrically connected to the pixels, and the lighting test transistors are configured to test lighting of the pixels. Each of the lighting test transistors includes a first active layer pattern formed over the substrate, a first gate electrode formed over the first active layer pattern, and a conductive pattern formed over the first gate electrodes. The conductive pattern is electrically connected to the first gate electrode, the first gate electrodes are spaced apart from each other and have substantially the same shape, and the conductive patterns are integrally formed.