LCD Data Line Segmentation for Power and Quality Trade-off
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Solution Overview
Problem
The dot inversion method in liquid crystal display (LCD) devices experiences high power consumption and potential picture quality deterioration due to pixel voltage variations and impedance deviations in data lines, particularly when using the column inversion method.
Innovation Solution
The LCD device employs a pixel voltage scheme where the first and (m+1)th data lines are connected, allowing for a column inversion driving method that reduces power consumption and prevents picture quality deterioration by adjusting impedance through an impedance adjustment device, enabling efficient dot inversion driving without increasing the number of output channels in data driving integrated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dot inversion method is used to improve picture quality by offsetting flicker in adjacent liquid crystal cells, then picture quality is improved, but power consumption increases due to larger pixel voltage variation and higher image signal frequency
Solution Approach 1:
The invention segments the data lines into two groups: odd-numbered data lines (DL1, DL3, ..., DLm-1) and even-numbered data lines (DL2, DL4, ..., DLm). This segmentation allows different polarity inversion patterns to be applied to different groups, enabling the system to achieve dot inversion benefits for picture quality while reducing overall power consumption by not inverting polarity on all data lines at every clock cycle.
Solution Approach 2:
The invention applies different polarity inversion characteristics to different local regions (odd and even data line groups). Odd data lines maintain a specific polarity pattern while even data lines use an opposite polarity pattern. This local differentiation allows the system to optimize picture quality in specific regions while controlling power consumption globally, rather than applying uniform dot inversion across the entire display.
2Use of energy by moving object
If the column inversion method is used to reduce power consumption compared to dot inversion, then power consumption decreases, but picture quality deteriorates due to insufficient flicker offset in adjacent cells
Solution Approach 1:
The invention segments the data lines into odd and even groups that can be independently controlled. This segmentation enables the system to achieve partial dot inversion effects in specific regions while maintaining lower overall power consumption closer to column inversion levels, thus balancing picture quality and power consumption.
Solution Approach 2:
The invention implements periodic polarity inversion with a period of two frames. In odd frames, odd data lines use one polarity pattern while even data lines use the opposite pattern. In even frames, the polarity patterns are swapped. This periodic action provides sufficient flicker offset for picture quality while reducing power consumption compared to continuous full dot inversion.
3Reliability
If impedance adjustment devices are added to prevent picture quality deterioration due to impedance deviation in data lines, then picture quality is maintained, but device complexity increases
Solution Approach 1:
The invention merges the impedance adjustment function with the existing data line structure by electrically connecting the first data line (DL1) and the (m+1)th data line (DLm+1) through a shared impedance adjustment device. This allows a single device to control impedance for multiple data lines, maintaining picture quality while minimizing the increase in device complexity compared to having separate adjustment devices for each data line.
Solution Approach 2:
The impedance adjustment device connected between DL1 and DLm+1 serves multiple functions: it adjusts impedance for both odd and even data line groups, provides reference voltage stabilization, and maintains signal integrity across the display panel. This multi-functionality reduces the need for additional dedicated impedance adjustment devices, thereby limiting the increase in device complexity.
Data Source
AI summary
An liquid crystal display device, including: m+1 data lines crossing n gate lines defining m×n pixels; m×n thin film transistors in each of the m×n pixels, wherein n thin film transistors in a column m are alternately connected to the mth data line and the m+1th data line; and an electrical connector that connects a 1st data line to an m+1th data line.