Cholesteric LCD Auxiliary Panel for Mirror and Display Modes
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Solution Overview
Problem
Conventional display apparatuses, such as TFT-LCDs, consume high power due to backlight sources, while reflective type LCDs lack functionality when not driven, limiting their use beyond information display.
Innovation Solution
A display apparatus incorporating a cholesteric Liquid Crystal Display (LCD) with an auxiliary panel that can display information even when the main panel is turned off, using cholesteric liquid crystals and partition walls to enhance visibility and structural stability, and a controller to manage voltage application for different modes, including transmissive, reflective, and transflective modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a transmissive type LCD (TFT-LCD) is used to display information, then the display function is achieved, but power consumption increases due to backlight sources
Solution Approach 1:
The display device is divided into two independent panels: a first panel for information display and a second panel for mirror function. This segmentation allows each panel to operate independently, enabling the information display function while reducing overall power consumption through the reflective technology of the second panel
Solution Approach 2:
The second panel serves multiple functions: it acts as a reflective mirror when no voltage is applied, and can display information when voltage is applied. This multi-functionality reduces the need for separate dedicated mirror components, lowering overall power consumption while maintaining display capabilities
2Use of energy by moving object
If a reflective type LCD is used to reduce power consumption, then power consumption decreases, but the display function is lost when the panel is turned off
Solution Approach 1:
The display device is divided into two independent panels: a first panel for information display and a second panel for mirror function. This segmentation allows each panel to operate independently, enabling the information display function while reducing overall power consumption through the reflective technology of the second panel
Solution Approach 2:
The second panel dynamically switches between reflective mirror mode (no voltage) and information display mode (voltage applied). This dynamic operation allows the panel to adapt to different usage scenarios, providing both mirror and display functions while maintaining low power consumption
3Device complexity
If cholesteric liquid crystals are used without partition walls, then the structure is simpler, but visibility and structural stability deteriorate
Solution Approach 1:
Partition walls are strategically positioned within the cholesteric liquid crystal layer to create localized regions with optimized optical properties. These partition walls improve visibility and structural stability in specific areas without requiring complete structural redesign, maintaining overall simplicity while enhancing local performance
4Ease of manufacture
If electrodes are spaced far apart in the cholesteric LCD, then the manufacturing is easier, but the voltage distribution becomes non-uniform affecting display quality
Solution Approach 1:
Partition walls are strategically positioned within the cholesteric liquid crystal layer to create localized regions with optimized optical properties. These partition walls improve visibility and structural stability in specific areas without requiring complete structural redesign, maintaining overall simplicity while enhancing local performance
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 solution reduces power consumption, enables the display of information or objects even when the main panel is off, and improves visibility and structural stability, allowing for a mirror function and enhanced display capabilities.
Implementation Method 1
the auxiliary panel may reflect light to display the predetermined object if driving of the display panel terminates
Implementation Method 2
the auxiliary panel may include cholesteric liquid crystals
Implementation Method 3
a liquid crystal layer disposed in front of the reflective layer, and configured to be converted between a transmissive mode for transmitting outside light
Implementation Method 4
a transflective mode for transmitting outside light and reflecting outside light at a predetermined area
Data Source
AI summary
An aspect of the present disclosure is to provide a display apparatus capable of performing an information display function and a mirror function. Another aspect of the present disclosure is to provide a display apparatus of displaying a predetermined object in a turned-off state. Another aspect of the present disclosure is to provide a display apparatus including partition walls disposed in space between electrodes of a cholesteric Liquid Crystal Display (LCD) device. Another aspect of the present disclosure is to provide a transparent display apparatus with improved visibility using cholesteric liquid crystals. Disclosed is a display apparatus includes a reflective layer; and a liquid crystal layer disposed in front of the reflective layer, and configured to be converted between a transmissive mode for transmitting outside light, a display mode for reflecting outside light to display an object, and a transflective mode for transmitting outside light and reflecting outside light at a predetermined area.