Display Controller Adaptive Bit-Depth for Ambient Light
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Solution Overview
Problem
Existing display technologies face challenges in maintaining image quality under varying ambient light conditions without significantly increasing power consumption, as they often require adjusting the number of subframes displayed, which can lead to degradation in image quality.
Innovation Solution
The implementation of a system that uses a memory component and controller to store mapping data, which maps ambient illumination ranges to bit-depth values for each color subfield, allowing for the determination of the number of subframes to be generated based on the ambient illumination level, and adjusts illumination time durations to balance power consumption and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of subframes is increased to maintain image quality under high ambient light, then image viewability is improved, but power consumption increases
Solution Approach 1:
The patent applies different bit-depth values to different color subfields (R, G, B) based on their luminance coefficients and the detected ambient light level. This allows each color channel to be optimized independently - colors with higher luminance coefficients receive more subframes when needed, while lower luminance colors use fewer subframes, thereby maintaining overall image quality while reducing total power consumption compared to uniformly increasing subframes for all colors.
2Use of energy by moving object
If the number of subframes is decreased to reduce power consumption, then power usage is reduced, but image quality degrades
Solution Approach 1:
The patent dynamically changes the bit-depth parameter for each color subfield based on ambient light detection. The controller adjusts the number of subframes per color channel according to the ambient light level and the luminance characteristics of each color, allowing the system to maintain adequate image quality across varying lighting conditions while optimizing power consumption by using fewer subframes when ambient light is sufficient.
3Use of energy by moving object
If bit-depth values are uniformly adjusted for all color subfields, then power consumption is optimized, but color-specific image quality is compromised
Solution Approach 1:
The patent assigns different bit-depth values to different color subfields (R, G, B) based on their individual luminance coefficients and the detected ambient light level. This allows each color channel to be optimized independently - colors with higher luminance coefficients receive more subframes when needed, while lower luminance colors use fewer subframes, thereby maintaining overall image quality while reducing total power consumption compared to uniformly increasing subframes for all colors.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for enhancing display viewability in high ambient conditions without excessive increase in power consumption. In one aspect, a controller associated with the display device can be configured to obtain an indication of ambient light conditions from an ambient light sensor or from a host device hosting the display device. Upon receiving an image frame, the controller can derive a set of color subfields and determine a bit-depth value for each color subfield based on the obtained indication of current ambient light conditions and mapping data which maps ranges of ambient light to respective bit-depth values on a color subfield by color subfield basis. The controller can then generate a number of subframes for each color subfield based on the respective determined bit-depth value and cause the generated subframes to be displayed.