Display Driver Duty Ratio Selection for Liquid Crystal Panels
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Solution Overview
Problem
Existing liquid crystal display drivers require separate development for each type of liquid crystal panel due to varying voltage-transmittance (VT) characteristics, leading to increased development and product costs, as waveforms suitable for one panel are not suitable for others.
Innovation Solution
A display driver that includes an interface circuit, selection circuit, and drive circuit to select duty ratio data from a larger set of options based on instruction information, allowing for arbitrary setting of duty ratios suitable for different VT characteristics, enabling equal transmittance changes across tone values despite non-linear VT characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PWM drive signal waveforms are set for one liquid crystal panel, then the driving performance is optimized for that specific panel, but the same waveforms are not suitable for other liquid crystal panels with different VT characteristics
Solution Approach 1:
The patent implements dynamic adaptability by enabling the display driver to dynamically select different PWM drive signal waveforms from multiple stored waveform data sets based on the detected VT characteristics of the liquid crystal panel. This allows the system to transition from a static, fixed waveform approach to a dynamic, adaptive approach that optimizes driving performance for each specific panel type.
Solution Approach 2:
The patent changes the parameters of the PWM drive signal by storing multiple waveform data sets with different duty ratios and timing characteristics. The system selects and applies the appropriate waveform parameters (duty ratio, pulse width, frequency) that match the VT characteristics of the connected liquid crystal panel, thereby resolving the contradiction between optimized performance and broad compatibility.
2Reliability
If separate display drivers are developed for each type of liquid crystal panel, then optimal driving performance is achieved for each panel type, but development costs and product variability increase
Solution Approach 1:
The patent creates a universal display driver that can drive multiple types of liquid crystal panels by incorporating multiple waveform data sets and an automatic selection mechanism. This single multi-functional driver replaces the need for multiple specialized drivers, thereby reducing development costs and simplifying manufacturing while maintaining optimal driving performance across different panel types.
Solution Approach 2:
The display driver performs self-configuration by automatically detecting or receiving VT characteristic information about the connected liquid crystal panel and autonomously selecting the appropriate PWM waveform data from its stored sets. This self-service capability eliminates the need for manual configuration or separate driver development for each panel type, reducing both development cost and complexity.
3Reliability
If PWM drive signal waveforms are set for one liquid crystal panel, then the driving performance is optimized for that specific panel, but additional development is required for other panels
Solution Approach 1:
The patent performs preliminary action by pre-storing multiple PWM waveform data sets covering different liquid crystal panel types within the display driver before actual operation. This advance preparation eliminates the need for time-consuming development and configuration work when new panel types need to be supported, as the appropriate waveforms are already available in the driver's memory for immediate selection and application.
Data Source
AI summary
A display driver (100) drives a liquid crystal panel (200) that is driven by a static drive method. The display driver (100) includes an interface circuit (110), a selection circuit (120), and a drive circuit (130). The interface circuit (110) receives instruction information and display data from the outside. The selection circuit (120) selects n pieces of selected duty ratio data, which are n pieces of duty ratio data of k pieces of duty ratio data, based on the instruction information. The drive circuit (130) selects output duty ratio data corresponding to a tone value indicated by the display data from the n pieces of selected duty ratio data, and performs PWM driving of the liquid crystal panel (200) by outputting a drive signal having a duty ratio indicated by the selected output duty ratio data.