Dual Modulator Display Signal Control for HDR Clipping
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Solution Overview
Problem
Conventional dual modulation display systems face issues with LCD clipping artifacts and high computational complexity when rendering high dynamic range images, leading to loss of contrast and texture information, and excessive resource usage.
Innovation Solution
The proposed system determines LCD image values prior to calculating backlight control signals, splitting the target image into a base layer for backlight illumination and a detail layer for display control, and using tone mapping to preserve high-frequency details and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dual modulation display systems calculate backlight control signals before LCD image values, then the rendering process follows traditional workflow, but LCD clipping artifacts increase and contrast information is lost
Solution Approach 1:
The patent inverts the conventional calculation sequence by determining LCD image values first, then calculating backlight control signals from those LCD values. This reversal prevents LCD clipping artifacts because the LCD values are optimized first without being constrained by pre-calculated backlight limitations, thereby preserving contrast and texture information in the final rendered image.
Solution Approach 2:
The patent performs preliminary determination of LCD image values before calculating backlight control signals. This preliminary action allows the system to establish optimal LCD parameters first, then derive backlight settings that support those LCD values, avoiding the information loss that occurs when backlight is predetermined.
2Manufacturing precision
If conventional systems process entire high dynamic range images at full resolution, then complete image data is processed, but computational complexity becomes excessive and resource usage increases
Solution Approach 1:
The patent segments the target image into a base layer and a detail layer. The base layer contains low-frequency information and is used for backlight illumination calculations, while the detail layer contains high-frequency information and is used for LCD control. This segmentation reduces computational complexity by allowing different processing strategies for different image components while maintaining overall image quality.
Solution Approach 2:
The patent applies different processing qualities to different parts of the image: the base layer is processed at lower resolution for backlight control, while the detail layer is processed at higher resolution for LCD control. This local quality approach optimizes resource usage by applying high computational effort only where necessary (detail preservation) while using lower computational effort for areas where it is less critical (overall illumination).
Data Source
AI summary
In one embodiment, a dual modulator display systems and methods for rendering target image data upon the dual modulator display system are disclosed where the display system receives target image data, possible HDR image data and first calculates display control signals and then calculates backlight control signals from the display control signals. This order of calculating display signals and then backlight control signals later as a function of the display systems may tend to reduce clipping artifacts. In other embodiments, it is possible to split the input target HDR image data into a base layer and a detail layer, wherein the base layer is the low spatial resolution image data that may be utilized as for backlight illumination data. The detail layer is higher spatial resolution image data that may be utilized for display control data.