Local-Dimming Display White-Point Compensation for Mixed LED Bins
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Solution Overview
Problem
Display devices with local dimming backlight units face challenges in achieving uniformity of white point due to the use of LEDs from different color bins, leading to noticeable color differences and increased manufacturing costs and time, especially when using multiple pick and place arms.
Innovation Solution
A method and apparatus that account for the white points of LEDs from different color bins by storing information related to these points in a memory, allowing for compensation during image processing to adjust pixel values and maintain uniformity, enabling the use of LEDs from multiple color bins without adverse effects on quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LEDs from different color bins are used in local dimming backlight units, then manufacturing cost and time are reduced, but uniformity of white point deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the white point coordinates of the display panel based on the specific LED color bin characteristics. The system determines the actual white point of the LEDs and compensates for deviations by modifying display parameters, thereby maintaining uniform white point appearance across the display even when LEDs from different color bins are used.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors and measures the actual white point characteristics of the LEDs during manufacturing or operation. This measured information is fed back to the control system, which then adjusts the display parameters accordingly to compensate for any white point deviations, ensuring uniform appearance across the display panel.
2Productivity
If multiple pick and place arms are used for LED assembly, then productivity increases, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the LED assembly process into multiple parallel operations handled by different pick and place arms. Each arm is responsible for specific tasks such as positioning, picking, or placing LEDs, allowing simultaneous operation and increasing overall assembly throughput while maintaining manageable complexity through modular task distribution.
3Loss of substance
If LEDs from multiple color bins are used, then loss of LEDs is reduced, but quality uniformity deteriorates
Solution Approach 1:
The patent uses parameter changes to compensate for variations in LED color bin characteristics. By determining the specific white point coordinates of the LEDs and dynamically adjusting display parameters accordingly, the system maintains quality uniformity across the display panel even when LEDs from multiple color bins are utilized, thereby reducing waste.
Data Source
AI summary
A method, a computer program code, and an apparatus for processing an image to be displayed by a display device, with a local dimming backlight unit that provides essentially white light is disclosed. The disclosure is further related to a method for manufacturing a display device, a corresponding display device, and a motor vehicle with such a display device. In a first step, an image to be displayed is received. Driving values for light sources of the local dimming backlight unit are then determined based on the image to be displayed. Based on the driving values, a backlight appearance is determined. Pixel values of the image are then adjusted based on the backlight appearance. Information related to white points of the light sources is taken into account in the step of adjusting pixel values of the image, which may be retrieved from a map stored in a memory.