Power-Saving Driving Circuit for Display Panel with Variable Voltage Capability
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Solution Overview
Problem
Conventional liquid crystal display (LCD) systems face high power consumption due to inadequate driving voltage capability, leading to differences in gray levels displayed by pixels and repeated charging/discharging of data lines, which increases energy usage.
Innovation Solution
A power-saving driving circuit and method that groups data lines into pixel regions with varying driving voltage capabilities based on pulse width and rising slope, where pixels farther from the source driver receive stronger voltage capabilities to ensure proper charging while reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driver outputs adequate driving voltage to ensure proper voltage level at distant pixels, then display quality is maintained, but power consumption increases due to repeated charging/discharging of data lines
Solution Approach 1:
The patent applies local quality by differentiating the driving voltage characteristics for different pixel regions. Pixels closer to the source driver receive driving voltage with smaller pulse width and/or smaller rising slope, while pixels farther away receive driving voltage with larger pulse width and/or larger rising slope. This localized adaptation ensures each region receives appropriate driving capability without unnecessary energy expenditure in regions that require less driving strength.
Solution Approach 2:
The patent changes the parameters of the driving voltage (pulse width and/or rising slope) based on the distance from the source driver. By adjusting these voltage parameters according to pixel position, the system optimizes the balance between ensuring adequate voltage delivery to distant pixels and minimizing power consumption from repeated charging/discharging operations in regions closer to the source.
2Reliability
If the source driver provides strong driving capability to all pixels, then voltage attenuation is compensated, but power consumption increases unnecessarily for pixels closer to the source driver
Solution Approach 1:
The patent implements local quality by providing differentiated driving voltage characteristics to different spatial regions. Pixels in the first pixel region (farther from source driver) receive driving voltage with larger pulse width and/or larger rising slope to compensate for voltage attenuation, while pixels in the second pixel region (nearer to source driver) receive driving voltage with smaller pulse width and/or smaller rising slope. This prevents unnecessary energy expenditure in regions that require less driving capability.
Solution Approach 2:
The patent applies partial action by providing only the necessary driving capability to each pixel region rather than uniform strong driving to all pixels. The first pixel region receives stronger driving voltage characteristics to compensate for attenuation, while the second pixel region receives milder driving characteristics, avoiding excessive action and the associated energy waste in regions closer to the source driver.
Data Source
AI summary
A power-saving driving circuit for a display panel is provided. The display panel includes a pixel array including a plurality of data lines. The data lines are grouped into a plurality of pixel regions according to a scan time. Each of the pixel regions has a plurality of pixels. The power-saving driving circuit includes at least one source driver. The source driver respectively supplies a driving voltage to the pixels on at least one of the data lines. The driving voltage supplied by the source driver to each of the pixel regions has a varying driving capability determined according to a pulse width and/or a rising slope of the driving voltage. The pulse width and/or the rising slope of the driving voltage is larger when the driving voltage is supplied for driving the pixels in the pixel region farther from the source driver.