Liquid Crystal Device Gray Scale Voltage Segmentation
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Solution Overview
Problem
As the number of display gray scale levels in liquid crystal devices increases, the configuration of data line driving circuits becomes more complex, requiring higher source voltages and leading to increased power consumption and transistor size, without sufficient simplification or reduction in withstand-voltage.
Innovation Solution
The liquid crystal device divides gray scale data into higher and lower bits, generating separate gray scale voltages for each, which are applied to pairs of pixel electrodes, simplifying the data line driving circuit and allowing for lower voltage operation and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of display gray scale levels increases, then the display precision is improved, but the configuration complexity of the data line driving circuit increases
Solution Approach 1:
The gray scale data is divided into higher bits and lower bits, with separate voltage generation circuits handling each segment. This segmentation allows the complex gray scale generation to be broken into manageable parts, reducing overall circuit complexity while maintaining high precision display capability
Solution Approach 2:
The patent transitions from generating all gray scale voltages in a single dimension to generating voltages in two dimensions (higher bit voltages and lower bit voltages) that are then combined. This dimensional approach simplifies each individual voltage generation circuit while achieving the required precision through their combination
2Measurement precision
If the number of display gray scale levels increases, then the display precision is improved, but the withstand-voltage of transistors increases
Solution Approach 1:
By segmenting the gray scale voltage generation into higher bit and lower bit portions, each transistor only needs to withstand a portion of the total voltage range. The higher bit circuit handles the major voltage swings while the lower bit circuit handles finer adjustments, reducing individual transistor voltage requirements
Solution Approach 2:
The voltage generation is separated into two voltage dimensions (higher bit voltages and lower bit voltages) that are applied to different pixel electrodes. This allows transistors in each circuit to be designed for lower voltage operation, reducing the required withstand-voltage while maintaining the ability to generate the full gray scale range through combination
3Measurement precision
If the number of display gray scale levels increases, then the display precision is improved, but the power consumption of the data line driving circuit increases
Solution Approach 1:
The power consumption is segmented and distributed across separate higher bit and lower bit voltage generation circuits. Each circuit operates at lower power levels independently, and their combined operation achieves the required precision without the exponential power increase that would result from a single high-precision voltage generation circuit
Solution Approach 2:
By separating voltage generation into two dimensional circuits (higher bit and lower bit), the patent enables independent optimization of each circuit's power consumption. The higher bit circuit handles the energy-intensive voltage switching while the lower bit circuit operates at lower power, reducing total power consumption compared to a unified high-precision circuit
4Measurement precision
If the number of display gray scale levels increases, then the display precision is improved, but the size of transistors increases
Solution Approach 1:
The transistor array is segmented into separate higher bit and lower bit voltage generation circuits. Each circuit uses smaller transistors sized for its specific voltage range, rather than requiring large transistors capable of handling the entire voltage range. This segmentation significantly reduces the overall transistor area while maintaining high gray scale precision
Solution Approach 2:
The transistor sizing is optimized across two dimensional circuits. Transistors in the higher bit circuit are sized for their specific voltage handling requirements, and transistors in the lower bit circuit are sized accordingly, rather than all transistors being sized for the maximum voltage. This dimensional separation reduces the total transistor area required
Data Source
AI summary
A liquid crystal device includes a plurality of pixels disposed in the shape of a matrix of n rows×m columns (where n and m are natural numbers equal to or larger than two), n scanning lines, 2m data lines including pairs of a first data line and a second data line for each column of the plurality of pixels, and a data line driving circuit that generates a first gray scale voltage corresponding to higher bits acquired by dividing gray scale data of plural bits into the higher bits and lower bits and generates a second gray scale voltage corresponding to the lower bits. Each one of the plurality of pixels includes a first switching element and a second switching element which are controlled to be turned on or off by the common scanning lines, a first pixel electrode to which the first or second gray scale voltage is supplied from the first data line through the first switching element, and a second pixel.