Display Device Voltage Control for Sensor Integration
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Solution Overview
Problem
Display devices face challenges in maintaining uniform luminance across different areas, particularly when sensor devices are integrated, leading to a reduction in pixel density and inefficient power usage due to varying driving voltages.
Innovation Solution
A display device design that includes a power supply unit generating multiple driving voltages and switching elements to selectively supply these voltages to sub-pixels in different areas, ensuring uniform luminance and optimizing power consumption by adjusting voltage levels based on pixel density ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor devices are disposed on the front surface of the display device, then sensor functionality is achieved, but the number of pixels is reduced due to area occupation
Solution Approach 1:
The patent moves sensor devices from the front surface (2D plane) to the back surface of the display device, utilizing the third dimension (depth/thickness) to resolve the conflict between sensor functionality and pixel density. This allows sensors to be positioned without occupying front surface area needed for pixels.
2Illumination intensity
If different driving voltages are applied to sub-pixels in different areas, then luminance uniformity can be adjusted, but power consumption increases
Solution Approach 1:
The patent applies different driving voltages to different areas of the display panel based on local requirements. Specifically, sub-pixels in areas with lower pixel density receive higher driving voltages to compensate for reduced luminance, while areas with higher pixel density receive lower voltages. This localized adjustment achieves luminance uniformity without uniformly increasing power consumption across the entire display.
3Area of stationary object
If the display area is widened by removing holes, then display area increases, but sensor device placement becomes more difficult
Solution Approach 1:
The patent relocates sensor devices from the front surface to the back surface of the display device. This dimensional transition allows the front surface to be fully utilized for display purposes without holes or openings, while sensors are accommodated on the back surface, thus resolving the conflict between maximizing display area and accommodating sensor devices.
Data Source
AI summary
A display device includes: a display panel including a first area and a second area, wherein the first area includes first sub-pixels, and the second area includes second sub-pixels; and a power supply unit that generates a first driving voltage and a second driving voltage greater than the first driving voltage to supply the first and second driving voltages to the display panel. The first sub-pixels receive the first driving voltage, and the second sub-pixels receive the first driving voltage or the second driving voltage.