Backlight Control Using Blue Sub-Pixel Extraction
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Solution Overview
Problem
Current camera systems with separate ambient light detectors and display panels lack efficient backlight control, particularly in idle modes where power consumption is high and accuracy is not critical, leading to suboptimal lighting conditions.
Innovation Solution
An apparatus and method that extract sub-pixel luminance values from image data to calculate ambient light luminance and generate a backlight control signal, comparing current and previous frames to adjust the backlight intensity, reducing power consumption and improving lighting adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a separate ambient light detector is used to control backlight, then backlight control is achieved, but power consumption is high and accuracy is insufficient in idle modes
Solution Approach 1:
The patent merges the ambient light detection function with the existing image sensor by utilizing the blue sub-pixel data from the display panel's image sensor. This eliminates the need for a separate ambient light detector, reducing power consumption while maintaining detection accuracy through the high-resolution image sensor data.
Solution Approach 2:
The image sensor is made multi-functional by using its blue sub-pixel not only for image capture but also for ambient light detection. This universal utilization of the image sensor's capabilities allows the system to perform both imaging and ambient light sensing functions with a single component, improving energy efficiency.
2Measurement precision
If sub-pixel luminance values are extracted from image data, then ambient light luminance can be calculated accurately, but processing complexity increases
Solution Approach 1:
The patent extracts only the blue sub-pixel luminance values from the image data, rather than processing all pixel data. This selective extraction approach reduces the amount of data to be processed while maintaining accurate ambient light luminance calculation, as the blue sub-pixel is specifically sensitive to ambient light conditions.
Solution Approach 2:
The patent applies local quality by focusing processing only on the blue sub-pixel channel which has specific characteristics for ambient light detection. Instead of uniformly processing all color channels, the system selectively processes only the relevant blue channel data, reducing overall processing complexity while maintaining detection accuracy.
Data Source
AI summary
An apparatus controls a backlight of a display panel of a camera system. The apparatus includes a sub-pixel extracting unit, an ambient light luminance calculating unit, and a backlight controller. The sub-pixel extracting unit extracts sub-pixel luminance values from image data, where the image data is indicative of a current image frame defined by a plurality of pixels, and where each of the pixels includes a plurality of sub-pixels. The ambient light luminance calculating unit calculates an ambient light luminance value of the current image frame from the sub-pixel luminance values extracted by the sub-pixel extracting unit. The backlight controller which generates a backlight control signal based on a comparison between the calculated ambient light luminance value of the current image frame and an ambient light luminance value of a previous image frame.