Display Light Intensity Adjustment via Reflective Polarizer and Diffuser
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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 energy efficiency.
Innovation Solution
A display system incorporating a backlight with light emitting elements, a first display unit with a liquid crystal layer and reflective polarizers, and a second display unit with a TFT layer and linear polarizers, along with a diffuser between the units, controlled by a microcontroller to adjust the liquid crystal layer's transmissive state and utilize reflective and linear polarizers to optimize light distribution and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED zones are used to control dimming and adjust visual properties, then light intensity adjustment capability is improved, but device complexity increases due to complex calibration and control requirements
Solution Approach 1:
A diffuser element is introduced as an intermediary component between the backlight and display layers. This diffuser mediates the light distribution from multiple LED zones, allowing complex lighting control to be achieved through a simple passive optical element rather than complex active control of each LED zone
Solution Approach 2:
The backlight is divided into multiple LED zones with different local lighting properties, allowing independent control of light intensity in different regions. Each zone can be calibrated to provide optimal lighting for its specific area, improving overall display quality while the diffuser simplifies the control mechanism
2Loss of energy
If multiple display units with different polarizer types are used, then light distribution and recycling are optimized, but device complexity increases
Solution Approach 1:
The display system is segmented into multiple display units, each with specific polarizer configurations optimized for their function. The first display unit uses reflective polarizers for light recycling, while the second uses linear polarizers for light distribution, allowing each segment to be optimized independently
Solution Approach 2:
Instead of using a single uniform polarizer type throughout the display, the system inverts the approach by using different polarizer types in different units. Reflective polarizers are used where light recycling is needed, while linear polarizers are used where light distribution is prioritized, optimizing overall system performance
3Illumination intensity
If a diffuser is added between display units to provide light profile transition, then visibility and contrast are improved, but device complexity increases
Solution Approach 1:
A diffuser element serves as an intermediary optical component between the backlight and display layers. This single passive component provides light profile transition and smoothing, improving visibility and contrast without requiring complex active control systems or multiple additional components
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
This configuration enhances light intensity adjustment, improves contrast ratio, and reduces power consumption by dynamically controlling light zones and recycling unused light, resulting in a more energy-efficient and visually effective display system.
Implementation Method 1
adjust the liquid crystal layer of the first display unit between at least a first transmissive state and a second transmissive state
Implementation Method 2
at least one reflective polarizer cooperating with one or more of the upper substrate and the lower substrate of the first display unit
Implementation Method 3
at least one linear polarizer cooperating with one or more of the upper substrate and the lower substrate of the second display unit
Implementation Method 4
A diffuser is disposed between the first display unit and the second display unit... the diffuser being arranged to provide a light profile transition for the light transmitted through the first display unit
Data Source
AI summary
A display system including a backlight including a housing receiving light emitting elements to generate and project light from the backlight and reflective portions disposed on the housing is described. A first display unit is disposed proximate the backlight and may include an upper substrate, a liquid crystal layer, and a lower substrate disposed opposite the upper substrate. A reflective polarizer may cooperate with one or more of the upper substrate and the lower substrate of the first display unit. A second display unit is disposed proximate the first display unit. The second display unit may include an upper substrate, a thin-film transistor (TFT) display layer cooperating with the upper substrate and a lower substrate disposed opposite the upper substrate that cooperates with the TFT display layer. A linear polarizer may cooperate with one or more of the upper substrate and the lower substrate of the second display unit.