LCD Panel Driving with Sequential Gate Lines for Faster Grayscale
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Solution Overview
Problem
Existing LCD technologies using cholesteric liquid crystal face challenges with high resistance-capacitance delay (RC-delay) in passive applications and high cross-voltage requirements in active applications, necessitating an improved driving method.
Innovation Solution
A method involving inputting waveforms to data and gate lines with specific timing and symmetry, utilizing thin film transistors to store voltage, and adjusting grayscale by repeatedly applying voltage to multiple gate lines within a target time frame, including positive and negative symmetry waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive applications are used with cholesteric liquid crystal, then the device structure is simpler, but the resistance-capacitance delay becomes very large
Solution Approach 1:
The patent divides the gate line into multiple segments (first gate line, second gate line, third gate line) that are activated sequentially rather than simultaneously. This segmentation allows the voltage to be applied in staged manner, reducing the overall time required to achieve the desired liquid crystal orientation while maintaining a relatively simple device structure.
Solution Approach 2:
The patent applies voltage to the first gate line before the second and third gate lines. This preliminary action initiates the liquid crystal reorientation process early, and the subsequent voltage application to other gate lines continues and completes the process, thereby reducing the total response time without requiring complex simultaneous control.
2Loss of time
If active applications are used with cholesteric liquid crystal, then the resistance-capacitance delay is improved, but the cross-voltage required to switch becomes very large
Solution Approach 1:
The patent dynamically adjusts the voltage application timing and magnitude across different gate lines. By controlling the sequence and duration of voltage application to the first, second, and third gate lines, the system achieves efficient liquid crystal switching with reduced voltage requirements compared to traditional active applications.
Solution Approach 2:
The patent employs periodic voltage application to the gate lines in a sequential manner. The voltage is applied to the first gate line, then the second, then the third, creating a periodic action pattern that efficiently switches the liquid crystal molecules without requiring high cross-voltages, thus reducing energy consumption.
3Speed
If voltage is applied to multiple gate lines simultaneously, then the switching speed is faster, but the voltage control complexity increases
Solution Approach 1:
The patent segments the voltage control into distinct temporal phases, with each gate line receiving voltage application at different times. This segmentation simplifies the control logic by avoiding the need for complex simultaneous voltage coordination, while still achieving fast switching through the sequential activation of multiple gate lines.
Solution Approach 2:
The patent uses preliminary voltage application to the first gate line before activating subsequent gate lines. This preliminary action establishes the initial voltage state, and the sequential activation of other gate lines builds upon this foundation, achieving fast switching with simpler control logic rather than requiring complex simultaneous control.
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 reduces the time required to adjust grayscale and brightness in LCDs by efficiently changing the reflectivity of liquid crystal molecules, thereby improving display performance.
Implementation Method 1
step (e) includes storing the voltage through a plurality of thin film transistors
Implementation Method 2
inputting a waveform to a data line in a target time, in which the target time is longer, a reflectivity of a plurality of liquid crystal molecules in the display panel is lower
Data Source
AI summary
A method for driving a display panel includes (a) inputting a waveform to a data line in a target time, in which the target time is longer, a reflectivity of a plurality of liquid crystal molecules in the display panel is lower; (b) inputting a voltage to a first gate line in a time interval; (c) inputting the voltage to a second gate line in the time interval, in which the first gate line is not input with the voltage; (d) inputting the voltage to a third gate line in the time interval, in which the first gate line and the second gate line are not input with the voltage; and (e) repeating steps (b) to (d) until the target time, in which the target time is at least 40 milliseconds.