Display Drive Circuit Simultaneous Data Transfer
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Solution Overview
Problem
Liquid crystal displays experience brightness differences among pixel cells due to variations in data sustain times, leading to degraded picture quality.
Innovation Solution
A drive circuit that simultaneously supplies sampled analog data signals to all data lines, using latches and buffers to ensure equal data sustain times for each pixel cell, and employs inversion driving methods to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential sampling of analog data signals is used, then device complexity is reduced, but brightness difference among pixel cells increases due to varying data sustain times
Solution Approach 1:
The patent divides the data transfer process into two distinct phases: a sampling phase where analog data signals are sequentially sampled by sampling switches, and a transfer phase where the sampled signals are simultaneously transferred to data lines. This segmentation allows each phase to be optimized independently, achieving both simplified sequential sampling and uniform brightness distribution.
Solution Approach 2:
The patent applies preliminary action by sampling and storing the analog data signals in buffer memory before the actual data transfer to pixel cells. This preliminary sampling step captures the data at specific time points, and the buffer memory then holds these samples available for simultaneous transfer to all data lines, eliminating the brightness variation caused by sequential updating.
2Loss of time
If sequential data transfer to pixel cells is used, then data transfer time is reduced, but picture quality degrades due to brightness differences
Solution Approach 1:
The patent performs preliminary sampling of all analog data signals during a dedicated sampling period before the data transfer phase. This preliminary action ensures that all data are ready in the buffer memory simultaneously, allowing for parallel transfer to multiple data lines and eliminating sequential update delays that cause brightness variations.
Solution Approach 2:
The patent segments the data transfer operation into sampling phase and transfer phase, allowing all data to be sampled sequentially (simplifying control) then transferred simultaneously (ensuring uniform brightness). This segmentation resolves the contradiction between transfer time efficiency and image quality uniformity.
Data Source
AI summary
A drive circuit of a display device and a method for driving the display device are disclosed. The drive circuit includes at least one data transfer line to receive analog data signals including information for an image; a first latch to sequentially sample analog data signals transferred from the at least one data transfer line and to sequentially store the sampled analog data signals; and a second latch to receive the sampled analog data signals from the first latch and to simultaneously supply the sampled analog data signals to a display.