LED Driving Element Black Line Insertion Without Clock Frequency Increase
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Solution Overview
Problem
Conventional LED driving elements for liquid crystal display devices require increasing the clock frequency to perform black line insertion display, leading to potential high-frequency noise and increased power consumption.
Innovation Solution
The proposed LED driving element features parallel-connected shift registers and a switching circuit that allows for sequential data transmission between adjacent elements, enabling black line display without increasing clock frequency, thus reducing noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the clock frequency is increased to perform black line insertion display, then the image quality is improved, but high-frequency noise occurs and power consumption increases
Solution Approach 1:
The patent divides the data transmission path into two separate shift registers (first and second shift registers) that operate in parallel. During black line insertion display, only one shift register is activated to transmit data for the visible rows, while the other remains inactive. This segmentation allows the system to maintain the same data transmission capability without increasing clock frequency, thereby avoiding high-frequency noise while preserving image quality.
2Measurement precision
If the clock frequency is increased to perform black line insertion display, then the image quality is improved, but power consumption increases
Solution Approach 1:
The patent segments the data transmission function into two separate shift registers, enabling selective activation. During black line insertion display, only one shift register is active, reducing the overall power consumption compared to operating both registers at high frequency. This segmentation strategy maintains image quality while minimizing energy usage.
Solution Approach 2:
The patent implements periodic switching between normal display mode and black line insertion mode using control signals. During black line insertion display, the system alternates between transmitting data for visible rows and maintaining black lines, allowing the shift registers to operate at lower frequencies while still achieving the desired image quality improvement.
3Length of stationary object
If data are transmitted sequentially through multiple LED driving elements, then the wiring length is reduced, but the data transmission complexity increases
Solution Approach 1:
The patent divides the data transmission system into multiple LED driving elements, each with its own shift register. This segmentation allows data to be transmitted sequentially through the elements with reduced wiring length, as each element handles a portion of the overall data transmission task. The complexity is managed by replicating the shift register functionality in each element rather than creating a complex centralized transmission system.
Solution Approach 2:
The patent implements a nested structure where multiple LED driving elements are connected in series, with each element containing its own shift register nested within the overall data transmission chain. This nesting allows data to flow through each element sequentially, reducing the need for extensive external wiring while maintaining organized data transmission through the hierarchical structure of nested components.
Data Source
AI summary
An LED driving element that can perform black line insertion display without increasing the clock frequency. LED driving element 11 has first and second shift registers 34a, 34b used for controlling the light-emitting elements on one side among the light-emitting elements arranged in two adjacent rows. In the normal mode, the first and second shift registers 34a, 34b are connected in series. In the image quality improvement mode, the first or second shift register is bypassed by short circuit line 30. In the normal mode, the light emission data are moved serially through the first and second shift registers 34a, 34b. In the image quality improvement mode, the light emission data are moved in only one shift register, that is, shift register 34a or 34b, so that black line insertion can be performed in the same rewriting time per row as in the normal mode without increasing the clock frequency.