Anti-Peep Display Device Dimming Box Color Correction
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Solution Overview
Problem
Existing display devices with switchable anti-peep display function suffer from chromatic aberration between images at a side viewing angle and a front viewing angle under the anti-peep mode, due to the imbalance in light intensity proportions of red, green, and blue light caused by liquid crystal dispersion.
Innovation Solution
A display device configuration that includes a backlight module, a first dimming box, a second dimming box, and a liquid crystal display module, where the second dimming box is configured to adjust the light intensity of the color light with the highest brightness emitted by the first dimming box at the side viewing angle, thereby reducing the color coordinate offset between the side and front viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple identical dimming boxes are stacked to improve anti-peep effect, then the anti-peep performance is improved, but chromatic aberration between side and front viewing angles increases
Solution Approach 1:
The patent applies local quality by making each dimming box have different optical characteristics tailored to its position in the stack. Specifically, the first dimming box uses liquid crystal with a first refractive index difference while the second dimming box uses liquid crystal with a second refractive index difference that is smaller than the first. This local differentiation compensates for the cumulative dispersion effect across multiple stacked dimming boxes, maintaining color consistency while achieving the desired anti-peep performance.
2Illumination intensity
If dimming boxes are designed for optimal dimming at 589nm wavelength, then dimming ability is maximized, but color balance at side viewing angle deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the refractive index difference parameter of the liquid crystal material in each dimming box. The first dimming box uses liquid crystal with a larger refractive index difference for strong dimming capability, while the second dimming box uses liquid crystal with a smaller refractive index difference to reduce chromatic dispersion. This parameter optimization ensures both adequate dimming performance and acceptable color balance at side viewing angles.
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 proposed solution effectively reduces the chromatic aberration between images at the side and front viewing angles under the anti-peep mode by adjusting the light intensity proportions of red, green, and blue light, ensuring a color coordinate offset of less than 0.1869.
Implementation Method 1
control an angle between an axis of the liquid crystal and the light passing through the liquid crystal, thereby changing a polarization state of the light passing through the liquid crystal
Implementation Method 2
the effect of liquid crystal dispersion, which may increase chromatic aberration between an image at a side viewing angle and an image at a front viewing angle
Data Source
AI summary
Embodiments of the present disclosure provide a display device. The display device includes a backlight module, a first dimming box, a second dimming box, and a liquid crystal display module. The first dimming box is disposed on a light-emitting side of the backlight module. The second dimming box is disposed on a light-emitting side of the first dimming box. The liquid crystal display module is disposed on a light-emitting side of the second dimming box. A color coordinate offset between a color coordinate corresponding to a side viewing angle of 45° under the anti-peep mode and a color coordinate corresponding to a front viewing angle under the anti-peep mode is less than 0.1869.