Display Control Circuit Backlight Power Saving
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Solution Overview
Problem
In display panels, especially those used in mobile devices, the backlight module is the most power-consuming component, and existing methods fail to effectively adjust backlight intensity and compensate pixel values to achieve both power saving and distortion reduction.
Innovation Solution
A display control circuit comprising a threshold determining circuit, a PWM control circuit, and a pixel value adjusting circuit that adjusts backlight intensity and pixel values based on histogram analysis to optimize power consumption and minimize distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If backlight intensity is reduced to save power, then power consumption decreases, but image quality and brightness deteriorate
Solution Approach 1:
The patent changes the parameters of pixel values (gamma correction, brightness adjustment) in response to backlight intensity changes. When backlight luminance is reduced, the circuit adjusts pixel parameters to compensate, maintaining perceived image quality while achieving power savings through lower backlight power consumption.
2Use of energy by moving object
If backlight intensity is dynamically adjusted according to frame content, then power saving improves, but image distortion increases
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit analyzes frame content (histogram analysis of pixel brightness distribution) and uses this information to dynamically adjust backlight intensity and pixel values. This closed-loop approach ensures that power consumption is optimized while maintaining image quality by compensating for distortions through real-time parameter adjustments.
Solution Approach 2:
The system dynamically changes pixel parameters (brightness, gamma) based on the degree of backlight adjustment. When backlight intensity is reduced for power saving, corresponding pixel parameter adjustments are applied to compensate for potential image distortion, thereby maintaining overall image quality while achieving power consumption reduction.
3Illumination intensity
If fixed backlight luminance is used, then image quality is maintained, but power consumption increases
Solution Approach 1:
The patent transitions from a static fixed backlight luminance system to a dynamic adjustable system. The control circuit can adaptively adjust backlight intensity based on real-time frame content analysis, allowing the display to use lower power when full brightness is not needed while maintaining adequate image quality through dynamic parameter adjustment.
Solution Approach 2:
Instead of maintaining fixed backlight luminance, the system dynamically changes backlight intensity parameters based on frame content characteristics. Combined with corresponding pixel parameter adjustments, this enables power consumption reduction while preserving perceived display brightness and image quality where appropriate.
Data Source
AI summary
A display control circuit is capable of adjusting backlight intensity according to image content as well as compensating pixel values of frames for power saving and distortion reduction. The display control circuit includes a threshold determining circuit, a pulse width modulation (PWM) control circuit and a pixel value adjusting circuit. The threshold determining circuit determines a threshold according to a reference value by histogramming a to-be-displayed frame. The threshold is smaller than an upper limit of the pixel values, and a proportion of the number of pixel values between the threshold and the upper limit which occupy a total pixel number is lower than the reference value. The PWM control circuit generates a PWM signal for controlling a backlight luminance according to the threshold. The pixel value adjusting circuit adjusts the values of the pixels according to the threshold.