Under-Display Camera LCD Dimming for Blind-Region Luminance Matching
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Solution Overview
Problem
Conventional liquid crystal display devices with a camera under display configuration experience a luminance difference between the display and blind regions, causing the blind region to be visibly recognizable when the display region is set to zero or low gradation due to the use of conventional IR ink.
Innovation Solution
A liquid crystal display device with a dimming region overlapping the imaging region, featuring a dimming filter and a controller that controls the liquid crystal layer to match the luminance of the dimming region with the display region, using a dimming filter that transmits infrared light and visible light while attenuating visible light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional IR ink is used in the blind region, then the camera and IR light source are hidden, but a luminance difference occurs between the blind region and display region when the display region shows black or low gradation, making the blind region visually recognizable
Solution Approach 1:
The patent applies local quality by differentiating the treatment of the blind region from the display region. A dimming filter is specifically applied to the blind region (which overlaps with the imaging region) while the display region uses conventional IR ink. This localized differentiation allows the blind region to maintain luminance uniformity with the display region showing black or low gradation, preventing visual recognition of the blind region while preserving the hiding function.
Solution Approach 2:
The patent changes the optical parameters of the blind region by introducing a dimming filter that selectively attenuates visible light while transmitting infrared light. This parameter change allows the blind region to match the luminance of the display region when it displays black or low gradation, eliminating the luminance difference that makes the blind region visually recognizable, while still allowing the IR camera to function.
2Illumination intensity
If a dimming filter is provided in the dimming region to mask the blind region, then luminance matching is achieved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the dimming filter function with the existing blind region structure. The dimming filter is integrated into the liquid crystal panel structure in the region that overlaps with the imaging region, combining the light-shielding function with the luminance-matching function. This merging approach achieves luminance uniformity without requiring a completely separate masking system, thereby limiting the increase in device complexity.
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 effectively masks the dimming region by matching its luminance with the display region, preventing the blind region from being visibly recognized.
Implementation Method 1
a dimming filter that transmits infrared light and visible light while attenuating visible light
Implementation Method 2
a liquid crystal display in which a liquid crystal layer is disposed
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel in which a liquid crystal layer is disposed, a back light that illuminates the liquid crystal display panel from behind and that includes an imaging region in which an imager is provided, and a controller that controls a luminance of the liquid crystal display panel. The liquid crystal display panel includes a display region, and a dimming region provided so as to, when viewing the liquid display panel planarly, overlap with the imaging region of the back light. A dimming filter is provided in the dimming region. The controller is configured to control driving of the liquid crystal layer in the dimming region such that a luminance when the display region is set to zero tone and a luminance of the dimming region match.