Display Subpixel Activation Patterns for Power Reduction
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Solution Overview
Problem
As the resolution of display panels increases, the power consumption in flat panel display devices rises due to the frequent switching of control signals between gate ON and OFF voltages, leading to inefficiencies in driving subpixels.
Innovation Solution
A display device with a multiplexer and multiplexer controller that outputs control signals in a time division manner across multiple horizontal periods, reducing the number of transitions and thus lowering power consumption by maintaining gate ON voltage during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution of display panel is increased, then display quality is improved, but power consumption increases due to frequent switching of control signals
Solution Approach 1:
The patent applies periodic action by organizing control signal switching into two horizontal periods with opposite sequential patterns. During the first horizontal period, control signals are output in sequence from first to fourth scan periods, while during the second horizontal period, the sequence is reversed from fourth to first scan period. This periodic reversal pattern reduces the number of transitions required compared to continuous sequential switching, thereby lowering power consumption while maintaining high resolution display capabilities
Solution Approach 2:
The patent changes the temporal parameter of control signal output by implementing a reversible sequential pattern across two horizontal periods. The multiplexer controller outputs control signals in opposite sequences during alternating horizontal periods, optimizing the switching timing to minimize transitions. This parameter optimization reduces power consumption during high-resolution operation without compromising display quality
2Manufacturing precision
If control signals are switched frequently to maintain high resolution, then subpixel driving precision is improved, but the number of transitions increases causing higher power consumption
Solution Approach 1:
The patent implements periodic action by establishing a reversible sequential pattern for control signal output across two horizontal periods. The multiplexer controller alternates between forward sequence (first to fourth scan periods) and reverse sequence (fourth to first scan periods), creating a periodic pattern that optimizes transition timing. This approach maintains precise subpixel driving while reducing the total number of transitions and associated energy loss
Solution Approach 2:
The patent ensures continuity of useful action by maintaining uninterrupted control signal output to all data lines throughout both horizontal periods. The reversible sequential pattern ensures that control signals are continuously supplied without gaps, maintaining precise subpixel driving while optimizing the transition pattern to reduce energy loss. The continuous operation avoids idle states and maintains display precision
Data Source
AI summary
A display device includes a display panel, a data driver, a multiplexer, and a multiplexer controller. First to fourth color subpixels are disposed on the display panel. The data driver outputs a data voltage to be supplied to the first to fourth color subpixels, through output buffers. The multiplexer distributes each of data voltages output by output buffers to four data lines in a time division manner in response to first to fourth control signals. The multiplexer controller sequentially outputs a first control signal to an nth control signal during a first horizontal period, and sequentially outputs the nth control signal to the first control signal during a second horizontal period. The first and second horizontal periods include first to fourth scan periods which are continuous and uniform, and a subpixel receiving a data voltage output during the first scan period of the first horizontal period and a subpixel receiving a data voltage output during the first scan period of the second horizontal period are subpixels of the same color.