Display Device Data Driver Segmentation for Power Reduction
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Solution Overview
Problem
Flat panel display devices face increased power consumption and signal deterioration due to the large number of digital-to-analog converters and wiring, while reducing the number of converters leads to non-uniform charging times across pixels.
Innovation Solution
A display device with a gate driver applying gate-on voltages and a data driver generating data voltages for multiple pixels, where the application order and start position of data voltages are varied for each frame to ensure uniform charging time, using a latch, digital-to-analog converter, and selection units to manage image signals and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of digital-to-analog converters is increased to match the number of data lines, then the data voltage can be applied to all pixels, but the size of the driving circuits increases and power consumption increases
Solution Approach 1:
The data lines are divided into multiple groups, and each group is driven by a separate digital-to-analog converter. This segmentation allows the system to use fewer converters than the total number of data lines, thereby reducing power consumption while still covering all pixels through sequential driving
Solution Approach 2:
The patent employs dynamic switching of data line groups across different frames. By changing which group of data lines is active in each frame, the system ensures that all pixels receive data voltages over time while using a reduced number of converters, thus lowering power consumption without compromising display completeness
2Use of energy by moving object
If the number of digital-to-analog converters is decreased to reduce power consumption, then power consumption is reduced, but the charging time of data voltage becomes non-uniform across pixels
Solution Approach 1:
The patent applies periodic switching between different data line groups in successive frames. This periodic action ensures that each pixel group receives data voltages at regular intervals, maintaining uniform average charging time across all pixels while using fewer digital-to-analog converters to reduce power consumption
3Reliability
If the number of pads and wiring is increased to support more digital-to-analog converters, then more data lines can be driven, but signal deterioration increases
Solution Approach 1:
By segmenting data lines into multiple groups driven by different converters, the patent reduces the total number of simultaneous connections required. This segmentation decreases the overall wiring complexity and number of pads needed, thereby reducing signal deterioration while maintaining the ability to drive all data lines through sequential operation
Data Source
AI summary
The display device includes a display panel which includes a plurality of pixels, a gate driver which sequentially applies gate-on voltages to the plurality of pixels for a first period and a data driver which generates data voltages for at least two pixels of the plurality of pixels for the first period, and supplies the data voltages to the two pixels of the plurality of pixels, respectively, wherein an application order of the data voltages applied to the at least two pixels of the plurality of pixels is reversed in two adjacent frames.