Liquid Crystal Display Voltage Control for Color Breakup
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Solution Overview
Problem
Display devices with polymer-dispersed liquid crystal layers face challenges in maintaining high display quality due to issues like color breakup and limited resolution and brightness, primarily caused by inefficient control of voltages and light source operations.
Innovation Solution
The display device employs a controller to manage voltages between pixel and common electrodes in specific periods within a frame, allowing for improved timing of video component writing and holding, which reduces color breakup and increases allocatable time for scanning and holding periods, thereby enhancing display quality and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltages are applied continuously to control liquid crystal molecules, then display quality is maintained, but color breakup occurs and power consumption increases
Solution Approach 1:
The patent applies periodic voltage control to the liquid crystal layer, switching between display periods (with voltage) and non-display periods (without voltage). During non-display periods, voltages are stopped or reduced, allowing liquid crystal molecules to return to initial alignment and preventing color breakup. This periodic action maintains display quality while eliminating the harmful effect of continuous voltage application.
Solution Approach 2:
The patent implements a warm-up period before the display period where voltages are gradually applied to align liquid crystal molecules in advance. This preliminary action ensures that when the display period begins, the molecules are already properly oriented, preventing color breakup during the actual display phase while maintaining reliable image quality.
2Manufacturing precision
If scanning periods are extended to improve resolution, then display quality improves, but allocatable time for voltage control decreases
Solution Approach 1:
The patent divides the frame period into multiple display periods and non-display periods. During non-display periods, voltages are stopped or reduced, allowing liquid crystal molecules to return to initial alignment. This periodic resetting enables the system to handle longer scanning periods for improved resolution while maintaining sufficient voltage control time through the alternating structure.
Solution Approach 2:
The patent segments the frame period into multiple display periods (first, second, third display periods) and non-display periods. This segmentation allows the scanning process to be distributed across multiple time slots, extending the effective scanning time for higher resolution while ensuring that voltage control is maintained during each segment through the periodic structure.
3Illumination intensity
If light source operates continuously to maintain brightness, then display brightness is sufficient, but power consumption increases
Solution Approach 1:
The patent controls the light source to operate only during display periods and turn off during non-display periods. This periodic operation synchronizes with the voltage control cycles, maintaining sufficient brightness during active display phases while significantly reducing power consumption during non-display periods when no image is being displayed.
Solution Approach 2:
The patent ensures that during each display period, both the light source and voltage control operate continuously to maintain optimal brightness and image quality. This continuous operation during active periods maximizes the efficiency of each on-cycle, allowing the system to achieve sufficient overall brightness while minimizing total power consumption through the periodic off-cycles.
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 approach effectively suppresses color breakup, allows for increased time for writing video components, and results in improved display quality, resolution, and brightness, while also reducing power consumption.
Implementation Method 1
it is possible to control a tilt of an optical axis of the liquid crystal molecules with respect to an optical axis of the polymer by rotating the liquid crystal molecules by an electric field between each pixel electrode and the common electrode
Implementation Method 2
This makes it possible to control, for each pixel, a degree of scattering of light from the light source and to display an arbitrary video (image) on the display device
Data Source
AI summary
According to one embodiment, a display device includes a controller. The controller is configured to control voltages between the common electrode and pixel electrodes in first periods included in one frame period and control an operation of a light source in second periods included in the one frame period. The controller controls, in a first first period of the first periods included in the one frame period, the voltages between the common electrode and the pixel electrodes to write, following an immediately preceding one frame period, a video component of a same color as a color of a video component written by applying voltages between the common electrode and the pixel electrodes in a last first period of the first periods included in the immediately preceding one frame period.