OCB Mode LCD Pre-Tilt Electrodes for Fast Response
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Solution Overview
Problem
Conventional OCB mode liquid crystal displays require high power consumption and have slow transition speeds from the splay to bend orientation state, making it difficult to achieve high-speed moving picture display with uniform viewing angles.
Innovation Solution
The OCB mode liquid crystal display incorporates upper and lower pre-tilt electrodes that partially cover the driving electrodes, allowing a pre-tilt voltage to shift liquid crystal molecules into a bend or vertical orientation state, enabling rapid transition to a second orientation state with reduced power consumption by applying a lower driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-tilt voltage is applied to shift liquid crystal molecules from splay to bend orientation state in conventional OCB mode, then the orientation state transitions, but power consumption increases and transition speed becomes slow
Solution Approach 1:
The patent divides the electrode structure into multiple segments: a common electrode and multiple pixel electrodes arranged in an array. This segmentation allows independent control of voltage application to different pixel regions, enabling selective orientation state transitions that reduce overall power consumption compared to applying pre-tilt voltage across the entire display area.
Solution Approach 2:
The patent applies different voltage conditions to different regions of the liquid crystal layer. By applying voltage only to specific pixel electrodes that require orientation change rather than uniformly across the entire display, the system achieves local orientation state transitions, reducing total power consumption while maintaining necessary display performance.
2Reliability
If a pre-tilt voltage is applied to shift liquid crystal molecules from splay to bend orientation state in conventional OCB mode, then the orientation state transitions, but the transition time increases
Solution Approach 1:
The patent applies a preliminary voltage to the common electrode and selected pixel electrodes before the actual switching operation. This preliminary voltage application pre-aligns the liquid crystal molecules in regions that will undergo orientation state transition, reducing the time required for the actual switching from splay to bend orientation state when the display voltage is applied.
Solution Approach 2:
The patent employs dynamic voltage control by applying different voltage levels and waveforms to the common electrode and pixel electrodes during different phases of the switching cycle. This dynamic approach optimizes the electric field distribution over time, accelerating the orientation state transition of liquid crystal molecules and reducing overall transition time.
3Speed
If a high driving voltage is applied to achieve rapid orientation state transition, then response speed improves, but power consumption increases
Solution Approach 1:
The patent employs periodic voltage application with distinct phases: a preliminary voltage phase followed by a switching voltage phase. By using alternating current waveforms with optimized duty cycles and amplitude levels during different time intervals, the system achieves rapid liquid crystal response while reducing average power consumption compared to continuous high-voltage application.
Solution Approach 2:
The patent dynamically changes voltage parameters including amplitude, frequency, and duty cycle during the switching process. By optimizing these electrical parameters at different stages of the orientation state transition, the system achieves fast response speed during the critical transition phase while maintaining lower average power consumption through reduced voltage levels during stable states.
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 allows for rapid shifting of liquid crystal molecules into the second orientation state with low power consumption, enhancing response speed and enabling the display of high-speed moving pictures while maintaining uniform viewing angles.
Implementation Method 1
when a pre-tilt voltage is applied between the upper and lower electrodes 140 and 150, the liquid crystal molecules 130 are shifted from the splay orientation state into a bend orientation state
Implementation Method 2
When a driving voltage is applied between the upper and lower electrodes 140 and 150, the liquid crystal molecules 130 are shifted from the bend orientation state into a vertical orientation state by the driving voltage, thereby linearly transmitting light
Data Source
AI summary
Disclosed is an OCB mode liquid crystal display and a method for driving the same. The OCB mode liquid crystal display includes at least one pair of upper and lower pre-tilt electrodes to partially cover each of upper and lower driving electrodes. A pre-tilt voltage equal to or higher than a transition voltage is applied between the upper and lower pre-tilt electrodes to shift liquid crystal molecules into a first orientation state, that is, to shift a portion of the liquid crystal molecules into a bend or vertical orientation state. Therefore, although a low driving voltage is applied between the upper and lower driving electrodes, the liquid crystal molecules can rapidly be shifted into a second orientation state for screen display. Consequently, a high response speed can be achieved, so that it is possible to display a high-speed moving picture and to reduce power consumption.