Light Emitting Display Data Buffer Chips for Voltage Uniformity
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Solution Overview
Problem
In light emitting display apparatuses, the distance between pixels and the data driving circuit leads to increased RC loads, causing deviations in data voltage charging rates, resulting in luminance differences and image quality degradation, especially in high-resolution and large-area displays.
Innovation Solution
Incorporating data buffer chips connected to data lines to sample and hold data voltage, ensuring consistent charging rates across pixels regardless of distance from the data driving circuit, and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixels are positioned farther from the data driving circuit to increase display area, then display area is improved, but data voltage charging rate deviates due to increased RC load
Solution Approach 1:
The data driving function is segmented by introducing data buffer chips at intermediate positions along the data lines. This divides the long data transmission path into shorter segments, with each buffer chip responsible for a local segment, thereby maintaining consistent charging rates across the entire display area without compromising voltage uniformity
Solution Approach 2:
Data buffer chips are introduced as intermediary components between the data driving circuit and the pixels. These buffer chips receive data voltages from the driving circuit, buffer them temporarily, and then supply them to pixels, acting as mediators that compensate for RC load effects and maintain consistent charging rates across different distances
2Area of stationary object
If data lines are extended to reach farther pixels, then display area is improved, but power consumption increases due to higher RC load
Solution Approach 1:
The data transmission path is segmented into multiple shorter segments by placing data buffer chips at intermediate positions. Each segment has lower RC load and requires less power, thereby reducing total power consumption while maintaining large display area coverage
Solution Approach 2:
Data buffer chips serve as intermediary components that reduce the power burden on the main data driving circuit. By buffering data voltages locally and supplying them to distant pixels, these intermediaries reduce the overall power consumption of the data driving system
3Device complexity
If data voltage is supplied directly to distant pixels, then device complexity is minimized, but luminance uniformity deteriorates due to charging errors
Solution Approach 1:
Data buffer chips are introduced as intermediary components between the data driving circuit and pixels. These buffer chips receive data voltages from the driving circuit, buffer them temporarily, and then supply them to pixels, acting as mediators that compensate for RC load effects and maintain consistent charging rates across different distances
Data Source
AI summary
Disclosed is a light emitting display apparatus. The light emitting display apparatus includes a substrate including a display area including a plurality of pixel areas and a non-display area surrounding the display area, first to nth gate lines passing through the display area of the substrate, first to mth data lines passing through the display area of the substrate, first to mth pixel driving power lines passing through the display area of the substrate, a plurality of pixels provided in at least one pixel area of the substrate and connected to an adjacent gate line, an adjacent data line, and an adjacent pixel driving power line, and at least one data buffer chip provided in the display area of the substrate and connected to a corresponding data line of the first to mth data lines. Accordingly, a constant data voltage charging rate of each of the pixels is maintained regardless of a distance between a data driving circuit and each of the pixels.