Segmented Common Terminal Driving for LCD Power Reduction
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Solution Overview
Problem
Existing display devices, particularly liquid crystal display (LCD) panels in electronic devices, face limitations in reducing power consumption due to the need to maintain turn-off signals for non-displayed cells, which leads to unnecessary energy usage.
Innovation Solution
A display device configuration that allows independent driving of common and segment terminals using scanning and segment signals synchronized with the display signal, enabling the separation of common terminals into variable blocks and optimizing duty ratios to reduce power consumption and achieve multiple display forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a turn-off signal is output to all common terminals in an LCD display, then the display can maintain proper control of all display blocks, but power consumption cannot be reduced for non-displayed cells
Solution Approach 1:
The patent divides the common terminals into multiple independent common terminal blocks (COM0-COM3) that can be independently controlled. This segmentation allows the display to selectively activate only the terminal blocks corresponding to currently displayed content, eliminating the need to output turn-off signals to all terminals and thereby reducing power consumption for non-displayed cells while maintaining proper control of displayed areas
Solution Approach 2:
The patent implements dynamic control of common terminal blocks by varying the duty ratio for each block based on display requirements. The control circuit dynamically adjusts which common terminal blocks are active and modifies their driving waveforms, enabling flexible power management that adapts to different display scenarios while ensuring proper display control
2Adaptability or versatility
If the number of common terminals is increased to support multiple display blocks, then more display functions can be achieved, but power consumption increases due to driving all terminals
Solution Approach 1:
The patent segments the common terminals into multiple independently controllable blocks, allowing the system to support multiple display functions across different blocks while only activating the blocks needed for current display content. This enables versatile multi-block display capability without the penalty of driving all terminals continuously
Solution Approach 2:
The patent applies different driving characteristics to different common terminal blocks based on their display requirements. Each block can have its own duty ratio and driving waveform, allowing the system to optimize power consumption for each local region while maintaining the overall versatility needed for various display functions
3Speed
If the driving frequency is increased to improve display responsiveness, then display performance improves, but power consumption increases
Solution Approach 1:
The patent employs periodic scanning of common terminal blocks with variable duty ratios, creating a time-multiplexed display system. By periodically activating different common terminal blocks and using pulse-driven segment terminals synchronized with the scanning, the system achieves responsive display updates while reducing average power consumption through intermittent rather than continuous driving
Solution Approach 2:
The patent dynamically adjusts the driving frequency and duty ratio of common terminal blocks based on display requirements. The control circuit can vary the scanning period and duty ratios to optimize between responsiveness and power consumption, allowing high-speed updates when needed while operating at lower frequencies for static or slowly changing content
Data Source
AI summary
A display device includes independently driven common and segment terminals. The common and segment terminals are connected to display components divided into display blocks that are turned ON to perform a display function and are turned OFF so as to not perform the display function. A first driver drives the common terminals using a scanning signal of a predetermined period and a second driver drives the segment terminals using a segment signal synchronized with the scanning signal to correspond to a display signal, so that the display components perform a display corresponding to the display signal. The first driver separates the common terminals into common terminal blocks and drives the common terminals. The first and second drivers perform the driving so that the common and segment terminals which are connected to display blocks that are turned OFF are not supplied with a turn-off signal and are maintained at ground potential.