LCD Data Driver Segmentation for Brightness and Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing liquid crystal display devices face issues with low brightness and distortion due to short data supply time and high sampling frequency, which results in inadequate charging of pixels and insufficient data delivery to the data lines.
Innovation Solution
A driving apparatus that includes a data driver capable of dividing input digital data into multiple digital data streams, converting them into analog data, and simultaneously sampling and supplying these to the data lines, thereby reducing the sampling frequency and increasing the data supply time to each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sampling frequency is high, then the data can be supplied continuously, but the data supply time to each pixel becomes short resulting in inadequate charging
Solution Approach 1:
The data driver is divided into multiple data drivers (first data driver, second data driver, etc.) that operate in parallel. Each data driver handles a portion of the data lines, allowing the sampling frequency to be effectively reduced for each segment while maintaining continuous data supply across all data lines. This segmentation resolves the contradiction by distributing the data supply task across multiple units, thereby increasing the data supply time to each pixel without sacrificing overall throughput.
2Speed
If the sampling frequency is high, then the data delivery speed is fast, but the brightness is low due to insufficient charging time
Solution Approach 1:
By segmenting the data driver into multiple parallel units, each unit operates at a lower effective sampling frequency, allowing sufficient charging time for the liquid crystal cells to achieve proper brightness. The parallel architecture maintains fast overall data delivery speed while ensuring each pixel receives adequate charging duration for optimal illumination intensity.
3Loss of time
If the data supply time is short, then the sampling frequency can be high, but distortion occurs due to inadequate data delivery
Solution Approach 1:
The data driver is segmented into multiple parallel data drivers, each responsible for a subset of data lines. This segmentation extends the effective data supply time to each pixel by allowing simultaneous data supply through multiple channels, thereby preventing display distortion while maintaining high overall sampling frequency for fast data delivery.
4Device complexity
If a single data driver supplies data to all data lines, then the device complexity is low, but the data supply time is insufficient
Solution Approach 1:
The single data driver is segmented into multiple parallel data drivers, each handling a portion of the data lines. This segmentation increases the data supply time to each pixel by distributing the data supply task across multiple units operating in parallel. While this increases device complexity, it resolves the data supply time insufficiency by enabling simultaneous data supply to multiple data lines.
Data Source
AI summary
An apparatus for driving a liquid crystal display device includes a liquid crystal display panel and a controller for controlling division and latch of data, and controlling the sampling of the divided data. A data driver divides input digital data into a number of digital data under control of the controller, converts the latched digital data into a number of analog data, and then simultaneously samples the analog data to supply to the data lines.