LCD Gate Driver Segmentation for Power and Size Reduction
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Solution Overview
Problem
The existing LCD apparatuses face challenges in minimizing size and reducing power consumption, particularly in the TT type S-PVA mode with the GIL structure, where increased driving frequency and transistor count lead to larger panel sizes and higher power consumption.
Innovation Solution
The proposed LCD apparatus incorporates a main gate driver with a shift register having two stages connected in series and a sub-gate driver with inverters, applying main and sub-gate pulses in specific durations to reduce driving frequency and power consumption, while maintaining a constant driving frequency for both drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the TT type S-PVA mode LCD apparatus employs two transistors driven sequentially to apply different voltages to main and sub-pixels, then the viewing angle and lateral visibility are improved, but the driving frequency must be increased which leads to increased power consumption
Solution Approach 1:
The gate driver is segmented into two independent drivers: a main gate driver for driving main gate lines and a sub gate driver for driving sub gate lines. This segmentation allows each driver to operate independently at optimized frequencies, enabling the main pixel and sub-pixel to be driven separately rather than requiring sequential switching at high frequency, thus reducing overall power consumption while maintaining wide viewing angle performance.
2Adaptability or versatility
If the TT type S-PVA mode LCD apparatus increases the number of transistor stages to drive both main and sub-pixels, then the display quality and viewing angle are improved, but the size of the LCD panel increases
Solution Approach 1:
The gate driver functionality is segmented into two separate drivers positioned at opposite ends of the pixel array. The main gate driver is located at one end and the sub gate driver at the other end, allowing parallel driving of main and sub-pixels without requiring additional transistor stages in series. This spatial segmentation maintains high display quality while minimizing panel size increase.
Solution Approach 2:
Instead of increasing the number of transistor stages in the signal path (one-dimensional expansion), the solution positions the two gate drivers at opposite spatial locations (two-dimensional arrangement). This dimensional approach allows independent driving of main and sub-pixels without extending the signal chain, thereby avoiding panel size increase while maintaining superior display quality.
3Device complexity
If the LCD apparatus employs a GIL structure with integrated gate driver on the bottom substrate, then the number of chips is reduced, but the driving frequency must be increased for TT type operation which increases power consumption
Solution Approach 1:
The integrated gate driver in the GIL structure is segmented into two independent driving units: a main gate driver and a sub gate driver, each capable of operating at optimized lower frequencies. This segmentation maintains the chip integration advantage while eliminating the need for high-frequency sequential switching, thus reducing power consumption without increasing device complexity.
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 minimizes the size of the LCD apparatus and reduces power consumption by optimizing the number of transistors and maintaining a constant driving frequency, thereby improving the efficiency and performance of the display.
Implementation Method 1
Signals are supplied to the gate lines and data lines to apply an electric field across the liquid crystal layer
Implementation Method 2
the liquid crystals in the liquid crystal layer may have an anisotropic dielectric constant, the alignment of the liquid crystals may change when the electric field is applied across the liquid crystal layer
Implementation Method 3
since the liquid crystals have an anisotropic refractive index, light transmittance of the LCD apparatus may vary according to the alignment of the liquid crystals
Data Source
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AI summary
A display apparatus has a pixel including a main pixel connected to a main gate line and a data line, and a sub-pixel connected to a sub-gate line and the data line. A main gate driver outputs a main gate pulse to the main gate line during a time period 1H. A sub-gate driver receives the main gate pulse and outputs a sub-gate pulse to the sub-gate line during a first portion of time period 1H. The data driver applies a sub-pixel voltage to the data line during the first portion of time period 1H and applies the main pixel voltage to the data line during a second portion of time period 1H.