Dual-Cell Display System for Vehicle Instrument Panels
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Solution Overview
Problem
Conventional vehicle instrument panel displays suffer from leakage effects due to large backlight zones, leading to 'glow' or 'halo' issues and reduced contrast ratios, especially in areas with less than full brightness.
Innovation Solution
A high dynamic range display system is implemented, utilizing a dual-cell approach with a monochrome display and a color display, where the monochrome display acts as a variable backlight to correct for leakage by adjusting transmission levels based on the color display's contrast ratio and luminance, employing parallax and buffer pixels along with Gaussian tapering to minimize leakage and enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If large backlight zones are used in conventional displays, then the contrast ratio between white and black areas is improved, but leakage effects and glow/halo artifacts occur around lit pixels
Solution Approach 1:
The patent divides the backlighting function into two separate displays: a first display that provides the main image and a second display that provides localized backlighting. This segmentation allows the backlight to be applied pixel-by-pixel rather than through large zones, eliminating the glow and halo effects while maintaining high contrast ratios.
Solution Approach 2:
The patent implements local quality by allowing each pixel of the second display to independently control its backlight transmission level. This enables precise local adjustment of illumination intensity at each pixel location, providing high contrast where needed while preventing leakage in adjacent areas, thus achieving both high contrast ratio and eliminating harmful leakage effects.
2Illumination intensity
If zone backlighting is implemented to increase contrast ratio, then white areas are enhanced, but large zones create bleed through glow around lit pixels
Solution Approach 1:
The patent segments the backlighting function from the image display function by using two separate displays. The second display provides backlighting at the pixel level rather than through large zones, which enhances white area brightness while preventing bleed through glow that occurs with conventional zone backlighting.
Solution Approach 2:
Each pixel in the second display independently controls its backlight transmission, enabling local quality adjustment. This allows maximum brightness enhancement for white areas while preventing the bleed through glow artifact that occurs when large zones illuminate multiple pixels uniformly.
3Illumination intensity
If a dual cell display system is used to reduce leakage, then contrast ratio is improved, but device complexity increases
Solution Approach 1:
The patent merges two display technologies into a single integrated system where the first display (monochrome or color) and the second display (color or grayscale) are optically combined. This merging achieves high contrast ratio and leakage reduction while presenting a unified visual output, though it does increase structural complexity compared to conventional single-display systems.
Data Source
AI summary
A high dynamic range display includes a light source, a first display and a second display. The light source is configured to generate a backlight. The first display is aligned with the light source and has multiple first pixels. Each first pixel is configured to selectively pass and block the backlight. The second display is aligned with the first display and has multiple second pixels. A particular pixel is controlled to pass the backlight at a first transmit level. The particular pixel corresponds with an aligned pixel of the first pixels controlled to pass the backlight at a second transmit level and a multiple parallax pixels controlled to pass the backlight. The second transmit level is based on the first transmit level. The second transmit level offsets leakage of the backlight through the second display at the first transmit level to produce a high dynamic range final image.