Display Driving Device Brightness Adjustment via Clipping Ratio
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Solution Overview
Problem
Conventional display technologies increase power consumption and reduce color reproduction rates when adjusting brightness in bright environments, as they rely on increasing backlight power, leading to inefficient energy use and compromised image quality.
Innovation Solution
A display driving device and method that adjust image brightness based on ambient illumination without increasing power consumption, using a controller to determine a clipping ratio and calculate a frame gain for input image data, which is then gamma-converted to maintain optimal color reproduction in RGBW type display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight power is increased to brighten the image in a bright environment, then the image brightness is improved, but the power consumption increases
Solution Approach 1:
The patent changes the parameter of image data processing by applying gamma correction and clipping ratio adjustment instead of changing backlight power. The controller adjusts the gamma value and clipping ratio based on ambient illumination to optimize image brightness and contrast without increasing power consumption.
Solution Approach 2:
The patent replaces the mechanical/electrical system of adjusting backlight power with a signal processing system. Instead of physically increasing backlight intensity, the system processes image data through gamma correction and clipping operations to achieve brightness adjustment.
2Illumination intensity
If the backlight power is increased to brighten the image in a bright environment, then the image brightness is improved, but the color reproduction rate deteriorates
Solution Approach 1:
The patent uses gamma correction with adjustable gamma values to change the parameter of image data representation. By optimizing the gamma value based on ambient illumination conditions, the system maintains color accuracy while adjusting brightness, avoiding the color distortion that occurs with simple backlight power increase.
Solution Approach 2:
The patent replaces the physical backlight power adjustment with a digital signal processing approach using gamma correction and clipping ratio optimization. This substitution allows for precise control of image characteristics without the side effects of increased power consumption and color distortion.
3Illumination intensity
If the clipping ratio is increased to enhance image brightness, then the image visibility is improved, but the color accuracy deteriorates
Solution Approach 1:
The patent makes the clipping ratio dynamic by adjusting it based on ambient illumination conditions. The controller dynamically optimizes the clipping ratio to balance between brightness enhancement and color accuracy preservation, rather than using a fixed value.
Solution Approach 2:
The patent optimizes the clipping ratio parameter in conjunction with gamma correction. By coordinating the adjustment of clipping ratio with gamma value, the system achieves both brightness enhancement and color accuracy maintenance.
Data Source
AI summary
A display driving device, which adjusts a brightness of an image on the basis of an ambient illumination even without an increase in amount of power consumption, includes a controller determining a clipping ratio for clipping input image data by using an ambient illumination value when the ambient illumination value is input thereto, a gain calculator calculating a frame gain which is to be applied to the input image data, based on the clipping ratio, an input image clipping unit clipping the input image data by applying the frame gain in the input image data, and a gamma converter gamma-converting clipped input image data to generate output image data.