LED Bar Graph Display Flickering Elimination via Diffusion Plate
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Solution Overview
Problem
Existing LED display devices suffer from poor design properties and flickering when displaying changing levels, particularly when transitioning between display levels like '2' to '3' or '3' to '2', due to the rapid turning on and off of segmented bars.
Innovation Solution
Incorporating a diffusion plate at the front of the LED group and using a light emission control unit to cause light emission from a predetermined number of LEDs starting from one end, with decreasing brightness towards the other end, along with additional LEDs emitting different colors to enhance display clarity and reduce flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plurality of LEDs are used to display a bar graph, then the cost is reduced compared to liquid crystal indicators, but the design properties and visual appearance are degraded
Solution Approach 1:
A diffusion plate is introduced as an intermediary component between the LED array and the viewer. This diffusion plate softens the harsh point-source light from individual LEDs, creating a more uniform and visually appealing light distribution that enhances design properties while maintaining the cost benefits of using LEDs instead of liquid crystal indicators
Solution Approach 2:
The patent employs multiple LEDs with different colors (red, green, yellow, blue) arranged in the bar graph display. This color variation enhances the visual appearance and design properties of the display, making it more aesthetically pleasing while still using the cost-effective LED technology
2Speed
If segmented bars are rapidly turned on and off to indicate changing display levels, then the response speed is improved, but flickering occurs
Solution Approach 1:
When a display level changes, the patent activates the new higher level LEDs in advance before completely turning off the previous level LEDs. This preliminary action ensures that there is always light being emitted, eliminating the flickering effect while maintaining fast response speed for displaying changing levels
Solution Approach 2:
The patent ensures continuous light emission by overlapping the activation periods of consecutive display levels. As one level is being turned off, the next level is already turning on, maintaining continuous useful action (light emission) and eliminating gaps that would cause flickering
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves design properties by eliminating flickering and enhancing the visual appearance of the display, allowing for smoother transitions between display levels and the ability to display levels in mixed colors, thus improving overall display effectiveness.
Implementation Method 1
a diffusion plate which is arranged at a front side of the group of first light emitting elements
Data Source
AI summary
Provided is a display device in which design properties have been improved by eliminating the flickering when the display level changes. A microcomputer (5) causes light emission of first LEDs (23 and 24) which are the first and second ones counting from the right end among the emitting first LEDs (21 to 24), with decreasing brightness towards the right end. Furthermore, the microcomputer (5) causes light emission of second LEDs from a second LED (77) which is disposed at the right end of the second LEDs (71 to 77), to a second LED (73) which is disposed at a position overlapped with the first LEDs (23 and 24) that emit light with decreasing brightness towards the right end, and also causes light emission of second LEDs (73 and 74), which are the first and second ones counting from the left end among the emitting second LEDs (73 to 77), with decreasing brightness towards the left end.