Liquid Crystal Display Light Recycling for Contrast Control
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Solution Overview
Problem
Existing electronic displays face challenges in calibrating and controlling LED zones for optimal contrast and light intensity adjustments, leading to suboptimal visibility and power consumption.
Innovation Solution
A display system incorporating a microcontroller, reflective polarizers, and a diffuser to dynamically adjust the liquid crystal layer between transmissive states, utilizing dye-based linear polarizers and a backlight with light-emitting elements to achieve local dimming and enhance optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED zones are used to control dimming and adjust visual properties, then the display can provide contrast level adjustments, but the calibration and control becomes complex and fails to provide optimal contrast
Solution Approach 1:
The patent replaces the complex mechanical/electronic control system of multiple LED zones with an optical solution using liquid crystal display technology. The LCD panel dynamically adjusts light transmission through voltage-controlled liquid crystal orientation, eliminating the need for complex LED zone calibration and control while achieving precise contrast level adjustments.
Solution Approach 2:
The patent utilizes parameter changes in the liquid crystal layer's optical properties through voltage application. By changing the voltage across the LCD panel, the liquid crystal molecules reorient to different angles, dynamically adjusting light transmission and achieving contrast control without mechanical or electronic zone management.
2Loss of energy
If traditional polarizers are used in the display system, then light polarization is achieved, but light intensity is lost and optical efficiency is reduced
Solution Approach 1:
The patent implements a light recycling mechanism where light blocked by the liquid crystal layer is reflected back through the LCD panel and reused. This recovering process minimizes light intensity loss and maximizes optical efficiency by ensuring that light not immediately transmitted is not wasted but rather recycled for subsequent transmission opportunities.
Solution Approach 2:
The patent employs a feedback system using reflective polarizers and light recycling to continuously optimize light transmission. The system monitors and adjusts light paths dynamically, using the reflected light feedback to enhance the overall optical efficiency and maintain high light intensity throughout the display operation.
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 system improves light intensity control and reduces power consumption by recycling light, providing a more efficient and effective display with enhanced contrast ratios and reduced halo zones.
Implementation Method 1
The liquid crystal layer of the first display unit is a pixelated monochrome TFT LCD, wherein each pixel of the pixelated monochrome TFT LCD is dynamically configured to optically rotate polarized light to produce a local dimming backlight at a pixel level.
Implementation Method 2
one or more reflective polarizers cooperating with one or more of the upper substrate of the first display unit and the lower substrate of the first display unit
Implementation Method 3
A diffusing element is disposed proximate an upper surface of the housing, wherein the diffusing element cooperates with the backlight to distribute light generated by the one or more light emitting elements
Data Source
AI summary
A display system includes a backlight configured to project light. A first display unit is disposed proximate the backlight. A second display unit is disposed proximate the first display unit. A microcontroller is in communication with one or more of the backlight, the first display unit and the second display unit. The microcontroller executes instructions to adjust the first display unit between a first transmissive state and a second transmissive state.