LCD Gray Scale Voltage Generator for Constant Color Temperature
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Solution Overview
Problem
Conventional liquid crystal display devices cannot individually control the gray scale voltages for red, green, and blue data signals, leading to uneven color temperature across different gray scale levels, as they use the same voltage for all colors despite varying electro-optical characteristics.
Innovation Solution
A data driving device with a gray scale voltage generator that includes a voltage dividing resistor string to generate individual blue, red, and green gamma voltage signals, allowing for separate control of blue and red/green gray scale voltages to maintain constant color temperature, using a B gamma voltage signal generating section, a R/G gamma voltage generating section, and a common gamma voltage generating section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same gray scale voltage is used for red, green, and blue data signals, then the device complexity is reduced, but the color temperature uniformity deteriorates
Solution Approach 1:
The gray scale voltage control is segmented into separate control paths for blue data signals and red/green data signals. The voltage generator generates different gray scale voltages specifically for blue signals versus red and green signals, allowing independent optimization of each color channel's electro-optical characteristics while maintaining constant color temperature across all gray scale levels.
2Stability of the object's composition
If individual gray scale voltages are used for red, green, and blue data signals, then the color temperature uniformity is improved, but the device complexity increases
Solution Approach 1:
The control structure merges red and green data signals into a common control path while maintaining separate control for blue signals. This reduces the complexity compared to fully independent control of all three colors, while still achieving constant color temperature by addressing the different electro-optical characteristics of blue versus red/green liquid crystal materials.
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
The solution enables constant color temperature across all gray scale levels by individually controlling blue and red/green gray scale voltages, improving the display's color accuracy and uniformity.
Implementation Method 1
a voltage dividing resistor string to generate blue (B), red (R), and green (G) gamma voltage signals
Implementation Method 2
applying an electric field to a liquid crystal material having an anisotropic dielectric constant formed between two substrates and adjusting the intensity of the electric field to adjust light transmittance
Data Source
AI summary
A gray scale voltage generator includes a voltage dividing resistor string to generate blue (B), red (R), and green (G) gamma voltage signals, the voltage dividing resistor string including a B gamma voltage signal generating section, a R/G gamma voltage generating section, and a common (COM) gamma voltage generating section to individually control a B gray scale voltage and a R/G gray scale voltage to maintain a constant color temperature.