Liquid Crystal Display Source Driver Signal Segmentation
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Solution Overview
Problem
Liquid crystal display devices suffer from motion blurring due to the inherent viscosity and elasticity of liquid crystals, leading to lower response speeds and image quality degradation, particularly in high-speed operation modes, where the sampling and holding time is insufficient, causing signal overlap between frames.
Innovation Solution
The implementation of a liquid crystal display device with a source driver that bisects data signals and applies them as odd and even signals to neighboring data lines at different time intervals, ensuring adequate charging time and stable data signal display, along with a gate driver that extends the gate on time to allow sufficient overlap between neighboring gate lines for charging, thereby preventing motion blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the liquid crystal display device operates in high-speed mode with reduced frame period, then the response speed is improved, but the sampling and holding time becomes insufficient causing signal overlap and motion blurring
Solution Approach 1:
The patent divides the data signal application into two separate phases: odd field data signals applied during the first half of the gate on time, and even field data signals applied during the second half of the gate on time. This segmentation allows adequate charging time for each signal type without overlap, resolving the motion blurring issue while maintaining high-speed operation
Solution Approach 2:
The patent applies odd field data signals in advance during the first half of the gate on time before the even field data signals are applied. This preliminary action ensures that the pixel electrodes are fully charged with the first signal before the second signal is introduced, preventing signal overlap and maintaining image quality at high speeds
2Reliability
If the gate on time is extended to allow sufficient overlap between neighboring gate lines, then the data voltage charging is improved, but the frame period increases reducing operating speed
Solution Approach 1:
The patent dynamically adjusts the timing of data signal application within the gate on time period. By applying odd and even field data signals at different times (first half and second half respectively), the system achieves adequate charging without extending the overall gate on time, thus maintaining high operating speed while ensuring reliable voltage charging
3Productivity
If the sampling and holding time is reduced for high-speed operation, then the frame rate is improved, but the liquid crystal molecules cannot adequately respond causing image degradation
Solution Approach 1:
The patent uses periodic action by alternating between odd field and even field data signal applications within each frame period. This periodic structure ensures that each signal type receives adequate attention and charging time, allowing the liquid crystal molecules to respond properly even at high frame rates, thus maintaining image quality while improving productivity
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 high-speed operation with reduced motion blurring and improved image quality by ensuring adequate data voltage charging on pixel electrodes, maintaining brightness and preventing image degradation.
Implementation Method 1
the liquid crystal molecules exhibit optical anisotropy. Since light incident to the liquid crystal is refracted in the direction in which the liquid crystal molecules are oriented, image information is represented
Implementation Method 2
light incident to the liquid crystal is refracted in the direction in which the liquid crystal molecules are oriented
Implementation Method 3
It is possible to control the orientation of liquid crystal molecules by applying an electric field to the liquid crystal molecules
Data Source
AI summary
A liquid crystal display device has facing substrates, pairs of data lines, gate lines intersecting the data lines to define pixel areas, pixel electrodes formed in the pixel areas, a gate driver, a source driver and a latch circuit. Each pair of data lines includes first and second data lines adjacent each other. The gate driver applies a gate signal to the gate lines, and the source driver outputs data signals to the first and second data lines. The latch circuit stores a data signal output from the source driver and transmits relevant data signals to odd and even pixel electrodes formed between the first and second data lines. During high-speed operation, the data signal from the source driver is bisected and applied as an odd and even data signal to two neighboring data lines at certain time intervals.