Backlight Driving Current Adjustment for Display Thermal Management
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Solution Overview
Problem
High brightness requirements in display devices lead to thermal issues due to large driving currents, limiting design options and safety.
Innovation Solution
A display device with a backlight module that adjusts driving current based on input image data, using an image processing circuit to calculate estimated currents and adjust driving signals for each light source unit, allowing for high brightness while preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large driving current is used to achieve high brightness, then the brightness is improved, but thermal problems (overheating) occur
Solution Approach 1:
The patent applies dynamics by making the backlight driving current adjustable rather than fixed. The image processing circuit dynamically determines the driving current based on the actual brightness requirements of the displayed image content, allowing the system to adapt between high brightness modes (when needed for HDR content) and low brightness modes (when not needed), thus resolving the contradiction between achieving high brightness and preventing overheating
Solution Approach 2:
The patent changes the parameter of driving current from a constant value to a variable value that is determined based on image content characteristics. By calculating the required brightness from image data and adjusting the driving current accordingly, the system can maintain high brightness only when necessary, thereby reducing overall thermal generation while preserving HDR capability when needed
2Illumination intensity
If a large driving current is used to achieve high brightness, then the brightness is improved, but design options are limited
Solution Approach 1:
The patent enables design flexibility through dynamic current adjustment capability. The backlight module can operate across a wide range of current values (from low to high), allowing designers to optimize for different scenarios without being constrained by a fixed high-current design. This dynamic adaptability expands design options while maintaining the capability to achieve high brightness when needed
3Illumination intensity
If a large driving current is used to achieve high brightness, then the brightness is improved, but safety is reduced
Solution Approach 1:
The patent improves safety by changing the operating parameter from constant high current to variable current based on actual needs. The image processing circuit calculates the minimum necessary driving current to achieve the required brightness level, ensuring that high current is applied only when necessary for HDR content, thereby reducing unnecessary thermal stress and improving overall system reliability and safety
Data Source
AI summary
A display device is provided. The display device includes a display panel, a backlight controller, a light source module, and an image processor circuit. The display panel is divided into display regions. The backlight controller generates driving signals according to control signals. The light source units in the light source module are controlled respectively by the driving signals to emit light. The image processor circuit generates the control signals according to input image data. The image processor circuit obtains a respective estimated current according to the sum of first and second color brightness gains of the pixel cells in each display region and further determines an adjustment factor according to the sum of all the estimated currents. When the backlight controller operates in a high brightness mode, the image processor circuit changes the control signals according to the adjustment factor, thereby adjusting the driving signals.