Flat Panel Display Demultiplexer Signal Timing
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Solution Overview
Problem
In high-resolution flat panel displays, the increased number of data lines and drive circuits lead to higher production costs and insufficient application duration of scan signals, causing distortion and deformation of data signals, which cannot adequately compensate for the threshold voltage of drive transistors.
Innovation Solution
The method involves supplying an initialization signal to data lines not connected to the data driver before or during the application of scan signals in one horizontal period, and sequentially supplying data signals to pixels during the scan signal application, ensuring a sufficient duration for scan signals to compensate for the threshold voltage of drive transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data signals are sequentially supplied to multiple data lines using a demultiplexer to reduce the number of data drive circuits, then production cost is reduced, but the application duration of scan signals becomes insufficient causing data signal deformation
Solution Approach 1:
The patent applies preliminary action by supplying an initialization signal to data lines before the scan signal is applied to pixels. This initialization occurs in advance during the horizontal period, preparing the data lines to receive subsequent data signals without deformation. The initialization signal is supplied to data lines through the demultiplexer before the scan phase begins, ensuring proper signal timing and preventing distortion while maintaining the reduced data drive circuit configuration.
2Measurement precision
If the number of pixels is increased for higher resolution, then display resolution is improved, but the number of data lines and data drive circuits increases leading to higher production cost
Solution Approach 1:
The patent applies segmentation by dividing the data signal supply into multiple time-multiplexed phases using the demultiplexer. Instead of providing separate data drive circuits for each data line, the system segments the data signal transmission into sequential phases where a single data drive circuit output is distributed to multiple data lines through the demultiplexer. This time-division multiplexing approach allows high-resolution displays with many data lines to be achieved without proportionally increasing the number of data drive circuits, thereby reducing production cost while maintaining display resolution.
3Measurement precision
If scan signals are supplied in a shorter duration to accommodate more pixels, then higher resolution is achieved, but threshold voltage compensation of drive transistors becomes insufficient
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage compensation during the initialization phase before the main scan operation begins. The initialization signal supplied to data lines through the demultiplexer enables compensation circuits to adjust drive transistor threshold voltages in advance. This preliminary compensation ensures that when the shortened scan signals are applied to accommodate higher resolution, the transistors are already optimized for proper operation, maintaining reliability despite the reduced scan signal duration.
Data Source
AI summary
A flat panel display sequentially supplying data signals to a pixel portion using a demultiplexer and a method of driving the flat panel sufficiently supply scan signals in a horizontal period to prevent deformation and distortion of the data signal supplied to each pixel and compensate for a threshold voltage of a drive transistor of the pixel. The flat panel display includes a pixel portion having a plurality of pixels, a scan driver to supply scan signals to the pixel portion, a data driver to generate data signals, a demultiplexer portion to sequentially supply the data signals to the pixel portion, and a lighting tester to supply a lighting test signal and an initialization signal to the pixel portion. Alternatively, the flat panel display includes a pixel portion having a plurality of pixels, a scan driver to supply scan signals to the pixel portion, a data driver to output data signals and a demultiplexer portion to sequentially supply an initialization signal and the data signal to the pixel portion.