Display Data Line Pre-Charging Reduces Driver Power
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the data driver's power consumption and heating value increase due to charging all data lines, which is inefficient and leads to higher energy usage.
Innovation Solution
A display apparatus with a signal comparing unit and a pre-charge controller that compares current and subsequent image data to pre-charge data lines with predetermined voltage levels, reducing the need for the data driver to charge lines fully, thereby decreasing power consumption and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data driver charges all data lines, then the display panel can be driven, but the power consumption and heating value of the data driver increase
Solution Approach 1:
The patent applies preliminary action by pre-charging data lines before full charging. The pre-charge controller charges data lines to a first voltage level before the data driver charges them to the final voltage level. This preliminary charging action reduces the energy required for full charging while ensuring proper display operation.
Solution Approach 2:
The patent applies local quality by differentiating charging strategies for different data lines based on image data comparison. The system determines which data lines need pre-charging and to what extent by comparing current and subsequent image data, applying charging actions locally rather than uniformly to all data lines.
2Reliability
If the data driver charges all data lines, then the display panel can be driven, but the heating value of the data driver increases
Solution Approach 1:
The pre-charge controller performs preliminary charging of data lines to a first voltage level before the data driver completes the full charging process. This staged approach reduces the total energy dissipation and heating in the data driver while maintaining proper display functionality.
Solution Approach 2:
The patent applies partial action by providing only the necessary charging to data lines that require it, based on image data comparison. Not all data lines are fully charged, but only those that need pre-charging according to the comparison results, reducing overall energy consumption and heating.
3Use of energy by moving object
If pre-charging is performed based on image data comparison, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The pre-charge controller is integrated into the existing data driver structure, making the data driver perform multiple functions: pre-charging data lines based on image comparison and subsequent full charging. This multi-functionality approach reduces overall device complexity by consolidating control functions rather than adding separate independent systems.
Solution Approach 2:
The system uses the image data itself as the basis for determining pre-charging requirements. The comparison between current and subsequent image data automatically identifies which data lines need pre-charging and to what extent, eliminating the need for external complex control signals or additional sensors.
Data Source
AI summary
A display apparatus includes a display panel configured to display an image and comprises a plurality of gate lines, a plurality of data lines and a plurality of pixels connected to the plurality of gate lines and the plurality of data lines. A signal comparing circuit may be configured to compare an image data of an image currently being displayed with an image data of an image to be displayed subsequently, and to store a comparison data resulting from a comparison of the image data. A pre-charge controller may be disposed in the display panel and may pre-charge the plurality of data lines with predetermined voltage level based on the comparison data.