Display Device Data Line Width Variation for Signal Delay
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Solution Overview
Problem
In liquid crystal displays (LCDs), differences in signal delay due to varying resistance values in data lines cause vertical line defects and crosstalk, primarily due to the length and separation of data lines from driver circuits.
Innovation Solution
The solution involves adjusting the size of the demultiplexer, adding a capacitor to the demultiplexer, and varying the thickness of data lines to reduce signal delay differences, along with using a line selector with thin-film transistors and compensation capacitors to stabilize voltage and control signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the driver circuit is separated from the data lines by a specific distance, then the data lines can be routed independently, but the data lines have different resistance values due to their different lengths
Solution Approach 1:
The patent applies local quality by making different portions of the data lines have different physical characteristics. Specifically, data lines are assigned different thicknesses (widths) along their lengths or in different segments to compensate for their different lengths and resistance values, ensuring uniform signal delay across all data lines despite their separation from the driver circuit
Solution Approach 2:
The patent changes physical parameters of the data lines, particularly their thickness/width, to adjust their resistance values. By varying the thickness parameter of different data lines, the patent compensates for length differences and achieves uniform signal delay characteristics across all data lines
2Device complexity
If data lines have different resistance values, then the data driver circuit can be simplified with fewer outputs, but different data voltages are applied to each position causing vertical line defects and crosstalk
Solution Approach 1:
The patent applies local quality by making different portions of the data lines have different physical characteristics. Specifically, data lines are assigned different thicknesses (widths) along their lengths or in different segments to compensate for their different lengths and resistance values, ensuring uniform signal delay across all data lines despite their separation from the driver circuit
Solution Approach 2:
The patent changes physical parameters of the data lines, particularly their thickness/width, to adjust their resistance values. By varying the thickness parameter of different data lines, the patent compensates for length differences and achieves uniform signal delay characteristics across all data lines
Data Source
AI summary
A display device includes: a display panel including a plurality of gate lines on a substrate, a plurality of data lines crossing the gate lines, and a plurality of pixels, each of the pixels being coupled to one of the gate lines and to one of the data lines; a data driver configured to output data signals through a plurality of channel terminals; and a line selector configured to transmit the data signals to a plurality of data line blocks, each of the data line blocks including a plurality of data lines, wherein the line selector includes a plurality of thin-film transistors, and at least two of the thin-film transistors have different sizes.