Display Device Pre-Emphasis Voltage Adjustment for RC Delay
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Solution Overview
Problem
Display devices face image quality deterioration due to increased RC delay as the distance from the data driver to the pixel increases, especially with higher resolutions, and pre-emphasis driving methods elevate power consumption.
Innovation Solution
A display device with a power management circuit that adjusts the analog power supply voltage and pre-emphasis voltage based on distance, maintaining a predetermined margin voltage difference, to ensure efficient voltage delivery and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pre-emphasis voltage higher than the data voltage is applied to store the desired voltage level in the pixel, then the image quality is improved, but the power consumption of the display device increases
Solution Approach 1:
The patent applies dynamics by making the pre-emphasis voltage adjustable rather than fixed. The voltage level is dynamically changed based on the distance from the data driver to each pixel, allowing the system to optimize between image quality and power consumption for different spatial locations within the display panel
Solution Approach 2:
The patent implements local quality by applying different pre-emphasis voltage levels to different regions of the display panel based on their distance from the data driver. Pixels farther away receive higher pre-emphasis voltages to compensate for RC delay, while pixels closer to the driver receive lower voltages, thereby reducing overall power consumption while maintaining image quality where needed
2Manufacturing precision
If the resolution of the display device is increased, then the image quality is improved, but the transition time of data voltage decreases causing deterioration of image quality
Solution Approach 1:
The patent applies preliminary action by applying a pre-emphasis voltage before the actual data voltage to compensate for the reduced transition time. This preliminary voltage boost ensures that pixels, especially those farther from the data driver, receive sufficient voltage within the shortened horizontal time period caused by higher resolution
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; a power management circuit configured to generate an analog power supply voltage; and a data driver configured to provide a pre-emphasis voltage and a data voltage to the plurality of pixels based on the analog power supply voltage, wherein the display device is configured to adjust a voltage level of the pre-emphasis voltage according to a distance from the data driver to each of the plurality of pixels to which the pre-emphasis voltage is applied, and wherein the display device is configured to adjust a voltage level of the analog power supply voltage according to the adjusted voltage level of the pre-emphasis voltage.