Display Panel Driver Voltage Control for Sensor Area Luminance Uniformity
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Solution Overview
Problem
Display panels with integrated sensors suffer from non-uniform luminance due to the presence of transmission areas for user sensing, which affects the overall display quality.
Innovation Solution
A display apparatus with a sensor substrate having distinct areas for sensors and non-sensors, where the display panel driver adjusts voltage and power levels based on the ratio of pixel to non-pixel areas to compensate for luminance differences, ensuring uniform image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmission area is formed in the display panel for sensors to sense the user, then the sensor function is improved, but the luminance uniformity of the display panel deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the display characteristics between the first display area (with sensors) and the second display area (without sensors). The display panel driver controls different driving signals for these two areas, specifically adjusting the data voltage range for the first area to compensate for the transmission area's impact on luminance. This ensures each region has optimized display properties suited to its function.
Solution Approach 2:
The patent changes the electrical parameters (data voltage range) based on the regional characteristics of the display panel. For the first display area containing transmission areas, the data voltage range is adjusted to a smaller range compared to the second display area. This parameter modification compensates for the luminance reduction caused by the transmission areas, thereby maintaining overall luminance uniformity.
2Illumination intensity
If different driving signals are applied to the first display area and second display area, then the luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent segments the display panel into two distinct display areas: a first display area corresponding to the sensor region with transmission areas, and a second display area corresponding to the non-sensor region. This segmentation allows independent control of driving signals for each area, enabling tailored voltage ranges that compensate for the transmission area effects while maintaining manageable system complexity through clear spatial division.
Data Source
AI summary
A display apparatus includes: a sensor substrate including a first area and a second area; a plurality of sensors at the first area and not at the second area; a display panel on the sensor substrate, the display panel including a first display area corresponding to the first area, and a second display area corresponding to the second area, the first display area including a pixel area and a non-pixel area; at least one subpixel at the pixel area and no subpixels at the non-pixel area; and a display panel driver to control a driving signal of the first display area and a driving signal of the second display area according to a ratio between the pixel area of the first display area and the non-pixel area of the first display area.