Transreflective LCD Pixel Electrode Design for Ambient Light Adaptation
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Solution Overview
Problem
Liquid crystal display devices struggle to maintain image visibility in dim environments and fail to efficiently switch between reflective and transmissive modes, leading to high power consumption and limited usability in varying light conditions.
Innovation Solution
A liquid crystal display device with a pixel electrode design that includes both reflective and transmissive regions, utilizing a backlight with LEDs for adjustable illumination, and an image processing circuit to detect brightness and switch between modes, allowing for efficient use of external light or backlight depending on ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a reflective liquid crystal display device is used to reduce power consumption, then power consumption is reduced, but visibility in dim environments deteriorates
Solution Approach 1:
The liquid crystal display device is designed to perform multiple functions by supporting both reflective mode and transmissive mode operations. The same display device can adapt to different lighting conditions (outdoor bright environments and indoor dim environments) without requiring separate devices, thereby reducing power consumption in reflective mode while maintaining visibility in transmissive mode when needed.
Solution Approach 2:
The display device dynamically switches between reflective mode and transmissive mode based on ambient light conditions. This dynamic adaptation allows the device to optimize power consumption during the day when external light is available, and automatically transition to backlight illumination at night or in dim environments to maintain visibility.
2Illumination intensity
If a transmissive liquid crystal display device with backlight is used to improve visibility in dim environments, then visibility is improved, but power consumption increases
Solution Approach 1:
The display device employs periodic action by using the backlight only when necessary (in transmissive mode during dim environments) rather than continuously. The device alternates between reflective mode during daytime and transmissive mode during nighttime or low-light conditions, thereby reducing overall power consumption while maintaining visibility when required.
3Use of energy by stationary object
If a reflective liquid crystal display device is used for outdoor display, then power consumption is reduced, but adaptability to different lighting conditions deteriorates
Solution Approach 1:
The display device achieves universality by incorporating both reflective and transmissive display capabilities in a single device. This allows the device to adapt to various lighting conditions including bright outdoor environments (using reflective mode) and dim indoor environments (using transmissive mode with backlight), thereby maintaining high adaptability while optimizing power consumption based on usage conditions.
4Illumination intensity
If a transmissive liquid crystal display device is used for indoor display, then visibility is improved, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts its operating mode based on ambient light detection. During nighttime or in dimly lit indoor environments, the device activates transmissive mode with backlight to ensure visibility. During daytime or in well-lit indoor environments, the device switches to reflective mode to minimize power consumption, thereby balancing visibility requirements with energy efficiency.
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
Enables image display in both reflective and transmissive modes, reducing power consumption and improving visibility in various light environments by dynamically adjusting illumination based on ambient brightness, thus enhancing the device's usability and display quality.
Implementation Method 1
an optical modulation operation is utilized to choose one between the two states: a state in which light from the backlight passes through liquid crystal to be output to the outside of the liquid crystal display device and a state in which light is not output
Implementation Method 2
a state in which external light, that is, incident light is reflected from a pixel electrode to be output to the outside of the device
Implementation Method 3
a backlight with LEDs for adjustable illumination
Data Source
AI summary
An object is to provide a liquid crystal display device which can recognize image display even when the liquid crystal display device is used in a dim environment. In one pixel, a pixel electrode including both of a region where incident light through a liquid crystal layer is reflected and a transmissive region is provided, and image display can be performed in both modes: the reflective mode where external light is used as an illumination light source; and the transmissive mode where the backlight is used as an illumination light source. When there is external light with insufficient brightness, that is, in a dim environment, the backlight emits weak light and an image is displayed in the reflective mode, whereby image display can be performed.