Liquid Crystal Display Screen for Ambient Light Reflection Control
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Solution Overview
Problem
Conventional OLED display screens suffer from poor contrast due to high reflectivity, especially in outdoor environments, as they strongly reflect ambient light, and existing solutions using quarter-wave plates and polarizers are ineffective in blocking all wavelengths and do not allow for switching between transmission and reflection modes to mitigate this issue.
Innovation Solution
A display screen design incorporating a light source layer, a liquid crystal layer, and a control unit that adjusts the optical phase of polarized light to block reflective light in one mode and enable ambient light-based display in another, using a semiconductor switch device to control the liquid crystal layer's optical rotation states across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a quarter-wave plate and polarizer are added to block ambient light reflection, then the contrast of the display screen is improved, but the device complexity increases and not all wavelengths can be effectively blocked
Solution Approach 1:
The patent changes the optical parameters of the liquid crystal layer by applying different voltages to switch between two states: one where the optical phase rotation blocks reflected light, and another where it allows ambient light to pass through for display. This dynamic parameter change enables the display to adapt to different lighting conditions without adding complex optical components.
Solution Approach 2:
The patent introduces a dynamically controllable liquid crystal layer that can switch its optical properties in real-time based on ambient light conditions. By applying voltage through the control unit, the liquid crystal molecules reorient to either block or transmit light, providing adaptive contrast enhancement without fixed optical filters.
2Object-affected harmful factors
If a quarter-wave plate is used to rotate optical phase by 45° per pass, then some ambient light reflection is blocked, but the rotated angles are inconsistent across different wavelengths resulting in poor blocking effect
Solution Approach 1:
The patent uses voltage-controlled liquid crystal to dynamically adjust the optical phase rotation angle. By changing the applied voltage, the liquid crystal can achieve different rotation angles (including 90° for complete blocking) regardless of the incident light wavelength, providing reliable and consistent reflection blocking across the entire visible spectrum.
3Illumination intensity
If the light source layer is always used to provide display light, then the display can show image information clearly, but the device cannot utilize ambient light for display and consumes more energy
Solution Approach 1:
The patent implements a dynamic switching mechanism between two display modes: active emission mode (light source layer on) and ambient light reflection mode (light source layer off). The control unit determines the appropriate mode based on ambient light conditions, enabling the display to conserve energy by utilizing ambient light when sufficient, while maintaining clear visibility when needed.
Solution Approach 2:
The patent makes the display screen multi-functional by enabling it to operate in both active emission mode and ambient light reflection mode. The same liquid crystal layer and polarizer structure serve dual purposes: blocking reflected light when the light source is on, and enabling ambient light display when the light source is off, thereby reducing overall power consumption.
4Object-affected harmful factors
If the liquid crystal layer rotates optical phase to block reflection, then visibility under ambient light is improved, but the display cannot switch between transmission and reflection modes
Solution Approach 1:
The patent implements a dynamically controllable liquid crystal layer that can switch between different optical states by varying the applied voltage. This enables the display to adaptively change between transmission mode (for ambient light display) and reflection mode (for self-emissive display), providing versatility across different operating conditions.
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 design effectively blocks ambient light reflection, allowing for improved visibility and contrast in both modes, ensuring the display can operate effectively under varying light conditions by rotating the optical phase of polarized light to prevent reflection and enable ambient light-based image display.
Implementation Method 1
the liquid crystal layer is controlled by the control unit so that optical phases of polarized light passing through the liquid crystal layer and corresponding to ambient light are rotated to a second angle satisfying a predetermined first condition from a first angle
Implementation Method 2
A display screen design incorporating a light source layer, a liquid crystal layer, and a control unit that adjusts the optical phase of polarized light
Implementation Method 3
the ambient light becomes linearly polarized light after passing through the polarizer
Implementation Method 4
a light source layer, configured to be in an 'on' state for providing a display light source corresponding to a first display mode
Data Source
AI summary
A display screen is disclosed. The display screen comprises a light source layer, configured to be in an “on” state for providing a display light source corresponding to a first display mode, when the display screen is in the first display mode, and to be in an “off” state when the display screen is in a second display mode different from the first display mode; a liquid crystal layer, disposed in front of the light source layer; a polarizer, disposed in front of the liquid crystal layer; and a control unit, in connection with the liquid crystal layer and configured to control the liquid crystal layer. An electronic device is also disclosed, including the above described display screen and a method for processing information of the electronic device.