Display Panel Pre-Charging Circuit for LCD Current Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) panels face high transition current consumption and elevated operation temperatures due to continuous data voltage changes, particularly in pixel patterns requiring continuous transitions, leading to potential abnormalities in LCD elements.
Innovation Solution
A display panel with a source driver incorporating a latching circuit, transmission switch circuit, and pre-charge switch circuits that pre-charge data lines with different voltages based on polarity signals and control signals during data transitions, reducing transition current and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous data voltage changes are applied to LCD panels, then display functionality is maintained, but transition current consumption increases and operation temperature rises
Solution Approach 1:
The patent applies preliminary action by pre-charging data lines before actual data signal transitions. The source driver circuit performs pre-charging operations in advance to reduce the voltage difference that needs to be overcome during data transitions, thereby reducing transition current consumption while maintaining display functionality
Solution Approach 2:
The patent changes voltage parameters by introducing different pre-charge voltage levels (first pre-charge voltage and second pre-charge voltage) based on polarity conditions. This parameter change allows the system to optimize transition current by selecting appropriate voltage levels before data signal transitions
2Use of energy by stationary object
If specific polarity inversion methods are adopted to save power, then power consumption is reduced, but operation temperature still rises for certain pixel patterns
Solution Approach 1:
The patent applies local quality by differentiating pre-charge operations based on local pixel patterns and polarity conditions. Different pre-charge voltages are applied to different data lines depending on their specific requirements, allowing optimized power consumption and temperature control for different regions of the display
3Use of energy by moving object
If pre-charge switch circuits are added to reduce transition current, then transition current and power consumption are reduced, but device complexity increases
Solution Approach 1:
The patent merges the pre-charge function with the existing source driver circuit by integrating pre-charge switch circuits alongside the data signal transmission path. This combining approach reduces transition current while minimizing the increase in overall device complexity through shared circuit resources
Data Source
AI summary
A display panel includes a switch control circuit, a first pre-charge switch circuit and a second pre-charge switch circuit. The switch control circuit is used for comparing the most significant bits (MSBs) of data signals to generate switch control signals for controlling the first and second pre-charge switch circuits, such that data lines are pre-charged through the first and second pre-charge switch circuits respectively. A method for driving a display panel is also provided herein.