Reflective LCD Grayscale Voltage Generator for Response Time Optimization
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Solution Overview
Problem
Reflective liquid crystal display devices face challenges in achieving optimal display quality due to limitations in voltage control, leading to increased response time and suboptimal grayscale voltage generation, particularly when relying on low driving voltages.
Innovation Solution
A liquid crystal display device with a reflective panel driver that generates grayscale voltages based on a driving voltage-reflection ratio property, using a memory to store and a grayscale voltage generator to produce voltages between a maximum and minimum voltage level, as well as a third voltage, to optimize reflection ratios and reduce response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low driving voltages are used to reduce power consumption, then power consumption is reduced, but response time increases and display quality deteriorates
Solution Approach 1:
The patent applies parameter changes by utilizing the non-monotonic relationship between driving voltage and reflection ratio. Instead of using a single monotonic voltage range, the system identifies a peak reflection ratio at a specific voltage (first voltage) and uses voltages both below and above this peak to achieve different grayscale levels. This allows the system to utilize the full voltage-range dynamic range of the liquid crystal display while maintaining low power consumption, thereby resolving the contradiction between power consumption and response time.
2Device complexity
If conventional grayscale voltage generation is used, then device complexity is low, but display quality and reflection ratio control are suboptimal
Solution Approach 1:
The patent changes the parameter approach by moving from linear/monotonic voltage-to-grayscale mapping to a non-monotonic mapping that exploits the peak reflection ratio property. The grayscale voltage generator uses the first voltage (peak reflection ratio) and a second voltage (lower reflection ratio) to generate multiple grayscale voltages, creating a more precise control mechanism that improves display quality without significantly increasing device complexity.
Solution Approach 2:
The patent implements feedback by storing the first voltage and second voltage in a memory component within the grayscale voltage generator. These stored voltage values serve as reference feedback that guides the generation of appropriate grayscale voltages, enabling precise control of reflection ratios and display quality while keeping the overall device architecture relatively simple.
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 improves display quality by generating grayscale voltages that decrease response time and enhance reflection ratios, allowing for better image rendering and reduced power consumption without the need for additional light sources.
Implementation Method 1
A liquid crystal display (LCD) device forms an electric field through a liquid crystal layer disposed between two substrates, changes an arrangement of liquid crystal molecules
Implementation Method 2
a reflection sheet disposed between the thin film transistor and the color filter layer and configured to reflect external light
Data Source
AI summary
A liquid crystal display device includes a reflective liquid crystal display panel and a panel driver configured to generate a driving voltage to drive the reflective liquid crystal display panel. The panel driver generates grayscale voltages having a voltage level between a first voltage and a second voltage based on a driving voltage-reflection ratio property in which a reflection ratio increases when the driving voltage increases to the first voltage and the reflection ratio decreases when the driving voltage increases from the first voltage to the second voltage.