Brightness Compensation Circuit for LCD Ghost Image Reduction
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Solution Overview
Problem
The existing backlight blinking technique for liquid crystal displays reduces image brightness to minimize ghost images, causing visual discomfort due to shortened backlight on-time, which is not effectively addressed by current brightness compensation methods.
Innovation Solution
A brightness compensation method and circuit that adjusts pixel driving data, driving gamma level, and driver boost level based on original image data and backlight timing parameters to enhance image brightness, utilizing a content analyzer circuit and backlight coefficient detection circuit to calculate and apply necessary compensation coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the backlight on-time is shortened to reduce ghost images, then the ghost image problem is improved, but the image brightness decreases causing visual discomfort
Solution Approach 1:
The patent adjusts pixel driving data, gamma levels, and driver boost levels as parameters to compensate for brightness loss. By dynamically changing these parameters based on the shortened backlight on-time, the system maintains image brightness while keeping the backlight duration reduced to minimize ghost images.
Solution Approach 2:
The brightness compensation is applied in advance before the backlight displays the image. The system calculates compensation coefficients based on the backlight timing parameters and pre-adjusts the pixel driving data, so that when the backlight turns on with reduced duration, the displayed image brightness is already compensated and maintains normal visual comfort.
2Object-affected harmful factors
If the backlight on-time is reduced to eliminate ghost images, then the ghost image problem is resolved, but the overall image quality deteriorates
Solution Approach 1:
The patent employs multiple adjustable parameters including pixel driving data, gamma correction levels, and driver boost levels. By precisely tuning these parameters, the system maintains high image quality metrics such as color accuracy and contrast while accommodating the reduced backlight on-time that eliminates ghost images.
Solution Approach 2:
The system uses the backlight timing parameters as feedback to dynamically adjust the brightness compensation. The compensation coefficients are calculated based on the actual backlight on-time duration, creating a closed-loop control that maintains optimal image quality regardless of the backlight duration settings.
Data Source
AI summary
A brightness compensation method and a brightness compensation circuit for a display device are provided. The brightness compensation method includes the following steps. Receive original image data. Receive backlight timing parameters. Perform brightness compensation according to the image data and the backlight timing parameters. The step of performing brightness compensation includes adjusting at least one of pixel driving data, a driving gamma level, and a driver boost level.