Electroluminescent Display Compensation Pattern for Luminance Uniformity
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Solution Overview
Problem
In electroluminescent display devices with double rate driving (DRD) structures, the exposure overlay shift causes parasitic capacitance differences between inverted sub-pixels of the same color, leading to luminance defects and image quality issues.
Innovation Solution
The electroluminescent display device incorporates a compensation pattern on the source electrode of switching transistors, spaced apart from the gate line, to minimize parasitic capacitance variations between sub-pixels, thereby improving luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the 1S2L technique divides one data line into two sub data lines and inverts pixel driving circuits for high-speed driving, then productivity is improved, but object-affected harmful factors worsen due to exposure overlay shift causing different parasitic capacitances in inverted sub pixels
Solution Approach 1:
The compensation pattern is designed and positioned in advance during the manufacturing process to preemptively counteract the parasitic capacitance differences that will occur during exposure overlay shift. By pre-positioning the compensation pattern at a specific distance from the gate line, the system prepares the electrical environment before the actual display operation, thereby eliminating the harmful effect of parasitic capacitance variation without compromising the high-speed driving capability enabled by the 1S2L technique
2Productivity
If gate lines are divided up and down for inverted sub pixels to enable high-speed driving, then productivity is improved, but manufacturing precision worsens due to luminance defects from parasitic capacitance variations
Solution Approach 1:
The compensation pattern is applied locally to specific sub pixels based on their position and the expected exposure overlay shift characteristics. Rather than uniformly treating all sub pixels, the compensation is tailored to the local electrical environment of each inverted sub pixel, addressing the parasitic capacitance difference at the source while maintaining the overall high-speed driving performance enabled by the divided gate line structure
Data Source
AI summary
An electroluminescent display device includes a display panel in which a plurality of pixels are disposed, each pixel including a first sub pixel, a second sub pixel, a third sub pixel, and a fourth sub pixel each having a different color; a data driver which supplies a data voltage to the plurality of pixels by means of a plurality of data lines; and a gate driver which supplies a gate signal to the plurality of pixels by means of a plurality of gate lines. Each of the plurality of data lines is divided into a plurality of sub data lines, and each of the plurality of sub data lines is connected to a plurality of sub pixels having the same color, the sub pixel includes a switching transistor, and a source electrode of the switching transistor includes a compensation pattern which is provided on at least one side of the source electrode spaced apart from the gate line, thereby improving luminance difference between sub pixels having the same color which are converted by the exposure overlay shift of the gate line.