Dynamic Transmission Line Termination for Display Drive Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display devices face challenges in efficiently terminating transmission lines and preventing signal collisions during differential serial transmission, particularly in transitioning between 1-chip and multi-chip configurations to meet varying resolution demands.
Innovation Solution
The implementation of a display device with multiple drive circuits that utilize SELC, SELA, SELB, and REVS terminals to dynamically terminate transmission lines and manage signal transmission, allowing for either 1-chip or multi-chip configurations based on voltage levels, and incorporating resistors to control signal termination and collision prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal display panel uses a 1-chip constitution for low resolution, then cost is reduced, but it cannot satisfy high resolution demands
Solution Approach 1:
The patent applies dynamics by making the chip configuration changeable through terminal settings. The liquid crystal driver can dynamically switch between 1-chip and plural-chip constitutions based on the resolution requirements, allowing the same hardware to adapt to different display resolutions without requiring separate designs for low and high resolution panels.
Solution Approach 2:
The patent implements universality by designing a single liquid crystal driver that can function in multiple configurations. By using terminal settings (SELA, SELB, SELC), the same driver hardware can serve both 1-chip and plural-chip constitutions, making it universally applicable to both low resolution and high resolution liquid crystal display panels.
2Reliability
If transmission lines are terminated in all drive circuits, then signal integrity is improved, but signal collision occurs during reading operations
Solution Approach 1:
The patent applies local quality by making termination settings specific to each drive circuit's role. The master drive circuit has transmission line termination enabled to ensure signal integrity during data input, while slave drive circuits have termination disabled to prevent signal collisions during reading operations. This localized differentiation resolves the contradiction between signal integrity and collision prevention.
Solution Approach 2:
The patent uses terminal settings (SELA, SELB, SELC) as intermediaries to control the termination state of transmission lines. These terminals act as mediators that selectively enable or disable termination based on whether the drive circuit is operating as master or slave, thereby managing signal integrity and collision prevention through controlled intermediate states.
3Measurement precision
If multiple chips are used for high resolution panels, then resolution capability is improved, but cost and device complexity increase
Solution Approach 1:
The patent makes the chip configuration dynamic and configurable through terminal settings. Users can switch between 1-chip and plural-chip constitutions based on resolution requirements, allowing the system to adapt to high resolution demands only when necessary, thereby balancing resolution capability with device complexity and cost.
Data Source
AI summary
A method of terminating a pair of transmission lines is changed over by terminal setting. Display data is supplied to a master drive circuit and (n−1)-pieces of drive circuits from a host computer via the pair of transmission lines in accordance with a differential serial transmission system. Each drive circuit includes an SELC terminal. When a voltage inputted to the SELC terminal is at a first voltage level, a resistor having a resistance value of Ra is connected between the pair of transmission lines in the master drive circuit thus terminating the pair of transmission lines, and the pair of transmission lines in the slave drive circuits is opened. When the voltage inputted to the SELC terminal is at a second voltage level which differs from the first voltage level, a resistor having a resistance value of (n×Ra) is connected between the pair of transmission lines.