LCD Display with Dual-Mode Dimming Panel for Privacy and HDR
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Solution Overview
Problem
Current LCD display devices face a trade-off between providing privacy features and achieving high Dynamic Range (HDR) and Contrast Ratio (CR) performance, with thicker devices required for both functionalities, which is undesirable in mobile computing where thinner designs are preferred.
Innovation Solution
An LCD display device with a dimming panel that operates in two modes: a privacy mode for uniform dimming and a local dimming mode for per-pixel control, allowing for dynamic privacy and HDR/CR performance without increasing thickness, by moving the dimming panel next to the backlight and enabling per-pixel control of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dimming panel is added to provide both privacy and local dimming functions, then both privacy and HDR/CR performance are improved, but the device thickness increases
Solution Approach 1:
The patent applies a single dimming panel that can operate in two distinct modes: a first mode for uniform dimming that provides privacy functionality, and a second mode for per-element dimming that provides local dimming functionality. This multi-functional approach allows one component to replace what would traditionally require separate components, thereby avoiding increased device thickness while achieving both privacy and HDR/CR performance enhancement.
2Object-affected harmful factors
If uniform dimming is applied for privacy, then privacy protection is improved, but image clarity and contrast are degraded
Solution Approach 1:
The patent implements a dynamic switching mechanism between two dimming modes. The system can transition from uniform dimming (first mode) optimized for privacy protection to per-element dimming (second mode) optimized for image clarity and contrast. This dynamic adaptability allows the display to optimize for different functional requirements based on operational context, resolving the contradiction between privacy protection and image quality.
3Manufacturing precision
If per-pixel control is implemented for local dimming, then HDR and contrast ratio are improved, but device complexity increases
Solution Approach 1:
The patent combines the privacy dimming function and local dimming function into a single integrated dimming panel with N dimming elements. By merging these functions into one component rather than using separate panels, the patent reduces overall system complexity while maintaining per-pixel control capability for local dimming. The unified structure simplifies the control architecture compared to having separate dedicated components for each function.
Data Source
AI summary
A liquid crystal display (LCD) device includes an LCD panel with a number (N) of pixel elements for displaying an image. A dimming panel includes N dimming elements. The dimming panel has a first mode to apply a uniform dimming to the N dimming elements to provide a privacy function for the LCD device. The dimming panel further has a second mode to a apply a per-element dimming to provide a local dimming function for the LCD device.