Parallel Gate Driving for LCD Charging Rate
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Solution Overview
Problem
Conventional LCDs face challenges in maintaining a sufficient charging rate for pixel electrodes due to reduced gate on time, especially in larger displays, which affects the quality and resolution of color images produced using field sequential color methods.
Innovation Solution
The solution involves applying a gate signal simultaneously to multiple gate lines and data signals of opposite polarities to adjacent pixel areas, increasing the gate on time and improving the charging rate, while also using a higher frame frequency and a backlight unit that provides primary colors sequentially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the FSC method is used to reduce pixel quantity and simplify fabrication, then manufacturing complexity is reduced, but the frame frequency must be tripled which decreases gate on time and deteriorates display quality
Solution Approach 1:
The gate driver is divided into multiple independent gate drivers, each controlling a subset of gate lines. This allows parallel operation where multiple gate lines receive gate signals simultaneously, effectively increasing the gate on time for each line while maintaining the high frame frequency required by the FSC method.
Solution Approach 2:
The patent transitions from sequential gate line driving (one dimension) to parallel gate line driving by applying gate signals to multiple gate lines simultaneously across different dimensions of the gate line array. This dimensional expansion of the driving approach increases effective gate on time without reducing frame frequency.
2Productivity
If the frame frequency is tripled for FSC method, then color image display is achieved, but gate on time decreases and charging rate of pixel electrode decreases
Solution Approach 1:
Multiple gate drivers are prepared and configured in advance to drive multiple gate lines in parallel. This preliminary arrangement ensures that when the high-frequency FSC signal is applied, the gate on time is already optimized through parallel operation, allowing sufficient charging time for the pixel electrode despite the tripled frame frequency.
3Area of stationary object
If more gate lines are used for larger displays, then display area increases, but gate on time decreases due to fixed frequency operation
Solution Approach 1:
The gate driver system is segmented into multiple independent units, each handling a portion of the total gate lines. This segmentation allows the system to scale to larger displays with more gate lines while maintaining adequate gate on time through parallel operation of the segmented drivers.
Solution Approach 2:
Multiple gate drivers are combined to work in parallel on different gate lines simultaneously. This merging of driving resources allows the system to accommodate larger display areas with more gate lines while preserving sufficient gate on time for proper pixel charging.
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 enhances the charging rate of pixel electrodes, improves display quality, and reduces the number of gate drivers and pads, allowing for higher resolution and faster refresh rates in LCDs.
Implementation Method 1
a liquid crystal layer having a dielectric anisotropy disposed therebetween. The LCD applies an electric field to the liquid crystal layer and controls the intensity of the electric field, thereby displaying an image, wherein the transmittance of light passing through the substrate is adjusted according to the intensity of the electric field.
Implementation Method 2
thin film transistors connected with the plurality of gate lines and the plurality of data lines
Data Source
AI summary
Disclosed is an LCD comprising a plurality of data lines extending in a first direction, a plurality of gate lines extending in a second direction defining with the plurality of data lines a plurality of pixel areas arranged in a matrix configuration and supplying a gate signal to at least two rows of the pixel areas simultaneously. Thin film transistors are connected to the plurality of gate lines and the plurality of data lines. Also disclosed is a driving method for an LCD including a thin film transistor substrate including pixel areas arranged in a matrix form with a gate line extending in a first direction and a data line extending in a second direction, along with a backlight providing the TFT substrate with light of three primary colors. In the method, the three primary colors are sequentially provided in one frame period and at least two rows of pixel areas and simultaneously provided with a common gate signal.