Display Pixel Data Driver Buffering to Block Grayscale Noise
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Solution Overview
Problem
The occurrence of noise due to instantaneous power consumption in data driving devices is significant, leading to defects and poor image quality in display devices, as the noise propagates through shared ground connections.
Innovation Solution
Incorporation of a latch circuit to store pixel image data, a digital-to-analog converting circuit to convert digital signals, a buffer circuit with an input switch to control connection with the digital-to-analog converting circuit, and an output switch to manage the connection between the data line and the buffer circuit, along with a buffer circuit that delays and amplifies the analog signal before transmission to the pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the data driving device changes the data voltage supplied to the display panel according to grayscale values, then the brightness control of pixels is improved, but instantaneous power consumption increases significantly causing noise
Solution Approach 1:
The data driving device is divided into multiple independent channel circuits, each handling a specific vertical line of pixels. This segmentation isolates the power consumption and noise generation to individual channels, preventing noise propagation across the entire display system through shared ground connections.
Solution Approach 2:
A buffer circuit is introduced as an intermediary component between the data voltage generation and the pixel driving. This buffer circuit acts as a mediator that isolates the high-power voltage switching operations from the sensitive pixel circuits, thereby reducing noise transmission while maintaining proper brightness control.
2Device complexity
If multiple components share the ground connection, then device complexity is reduced, but noise propagation increases
Solution Approach 1:
The ground connection system is segmented into channel-specific ground paths. Each channel circuit has its own dedicated ground connection, preventing noise generated in one channel from propagating through the shared ground to other channels. This maintains electrical functionality while eliminating noise coupling.
Solution Approach 2:
Different ground connection qualities are provided for different channels. Instead of a uniform shared ground, each channel receives a localized ground connection optimized for its specific noise characteristics, allowing noise isolation while maintaining overall system functionality.
Data Source
AI summary
A data driving apparatus includes a latch circuit that stores pixel image data representing a gray value of a pixel, a digital-to-analog converting circuit that converts, into an analog signal, a digital signal corresponding to the pixel image data by using gamma voltages; a buffer circuit that includes an input switch for controlling a connection with the digital-to-analog converting circuit and transmits, to the pixel, an analog signal for driving the pixel; and an output switch that controls a connection between the buffer circuit and a data line connected to the pixel, wherein, when the digital-to-analog converter converts a digital signal for a gray value into an analog signal, the digital-to-analog converting circuit delays the analog signal and inputs the analog signal to the buffer circuit to block occurring noise from propagating to the pixel.