Patterned Layer Tuning White Point Uniformity in Display Backlights
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Solution Overview
Problem
Current display devices with LED-based backlight units experience non-uniformity in white light distribution across the screen due to variations in white point values, affecting user experience by introducing unwanted color hues.
Innovation Solution
A backlight unit configuration that includes a light source unit, an optical processing unit with a quantum dot film, and a patterned layer to tune white point values, ensuring uniform light distribution across the display screen by adjusting the ratio of primary and secondary lights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight unit uses LED light source with phosphor film to produce white light, then the display device achieves basic illumination and color display, but the white point value varies across the display screen causing non-uniform color hue
Solution Approach 1:
The patent applies local quality by creating a patterned layer with spatially varying optical properties. The patterned layer includes different regions with different optical densities or compositions tailored to compensate for local white point deviations. Specifically, the patterned layer may have higher optical density in regions where the white point is too high and lower optical density where the white point is too low, thereby achieving uniform white point across the display screen.
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical density, thickness, or material composition of the patterned layer across different spatial locations. These parameter variations are designed to counteract the non-uniform white point distribution. The patterned layer's optical parameters are adjusted locally to transform the non-uniform white light output into uniform white point values across the display.
2Area of stationary object
If the backlight unit distributes light across the entire display screen, then the display achieves full-screen illumination, but the white point value non-uniformity causes annoying color variations that degrade user experience
Solution Approach 1:
The patent converts the harmful effect of non-uniform white point distribution into a benefit by using the patterned layer to deliberately introduce optical density variations that counteract the original non-uniformity. The patterned layer transforms the harmful color hue variations into uniform white point values, effectively converting the problem into a solution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves substantially uniform white point values across the display screen, enhancing user experience by minimizing color hue variations and improving overall display quality.
Implementation Method 1
an optical processing unit having a quantum dot film coupled to the light source unit
Implementation Method 2
a patterned layer configured to tune white point values of the distributed light at different locations on the display screen
Data Source
AI summary
Embodiments of a device and a method of tuning white point values of light distributed by a backlight unit of a display device are described. The device includes a backlight unit, an image generating unit, and a patterned layer. The backlight unit includes a light source unit and an optical processing unit having a quantum dot film coupled to the light source unit. The image generating unit includes a display screen. The backlight unit is configured to distribute light to the display screen and the patterned layer is configured to tune white point values of the distributed light to a desired white point value in order to achieve substantially uniform white point values across the display screen.