Liquid Crystal Display Partial Driving Common Electrode Segmentation
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Solution Overview
Problem
Conventional liquid crystal display devices consume excessive power during partial display modes, as they drive all subpixels to avoid damage to the liquid crystal, which is inefficient for portable terminals like smartphones and tablets.
Innovation Solution
The liquid crystal display device divides the display region into sections corresponding to common electrodes, driving only the selected section with pixel voltage levels and setting non-selected sections to a reference voltage level, thereby reducing power consumption by avoiding unnecessary AC drive schemes in non-display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all subpixels are driven with AC drive scheme to avoid damage to liquid crystal, then liquid crystal damage is prevented, but power consumption increases
Solution Approach 1:
The common electrode is divided into multiple independent common electrode elements corresponding to different display regions. This segmentation allows different driving schemes to be applied to different regions simultaneously - AC drive for displayed regions and DC drive for non-displayed regions, thus preventing liquid crystal damage while reducing overall power consumption.
Solution Approach 2:
Different driving schemes are applied to different spatial regions of the display panel. The displayed region receives AC drive scheme for liquid crystal protection, while the non-displayed region receives DC drive scheme for power saving. This local differentiation resolves the contradiction between uniform protection and selective power consumption.
2Reliability
If all subpixels are driven during partial display, then liquid crystal is protected from damage, but power consumption is unnecessarily increased
Solution Approach 1:
Instead of applying AC drive scheme to all subpixels (excessive action), the invention applies it only to the necessary displayed region (partial action). The non-displayed region uses simpler DC drive scheme, eliminating unnecessary energy consumption while maintaining adequate liquid crystal protection where needed.
3Reliability
If conventional liquid crystal display device drives all subpixels in partial display mode, then display reliability is maintained, but energy efficiency deteriorates
Solution Approach 1:
The display panel is segmented into displayed and non-displayed regions with corresponding common electrode elements. This enables differentiated driving strategies that maintain display reliability in active regions while improving energy efficiency by using simpler DC driving in inactive regions.
Solution Approach 2:
The invention changes the driving parameter (AC vs DC drive scheme) based on the display state and region. During partial display, displayed regions use AC drive parameters for reliability, while non-displayed regions use DC drive parameters for energy efficiency, thus optimizing the trade-off dynamically.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces power consumption during partial displays by selectively driving only the necessary sections, preventing damage to the liquid crystal and optimizing energy usage in portable terminals.
Implementation Method 1
a liquid crystal display panel (1) including: a first substrate (3) on which a plurality of subpixels (7) each including a pixel electrode (7b) are integrated; and a second substrate (4) opposed to the first substrate, a plurality of common electrodes (9) being formed on the second substrate
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel; and a driver driving the liquid crystal display panel. The liquid crystal display panel includes: a first substrate on which subpixels each including a pixel electrode are integrated; and a second substrate opposed to the first substrate, a plurality of common electrodes being formed on the second substrate. The display region of the liquid crystal display panel is divided into a plurality of sections respectively corresponding to the common electrodes. When a partial display in which an image is selectively displayed in a selected section is performed, the liquid crystal driver drives the common electrode corresponding to the selected section to a predetermined common voltage level, sets the common electrodes corresponding to the non-selected sections to a predetermined reference level, and sets pixel electrodes of subpixels in the non-selected sections to the reference voltage level.