Bus Stop Display Backlight Segmentation for Shading Visibility
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Solution Overview
Problem
Bus stop guide machines with LCD displays face short lifespans due to inconsistent light emission brightness, leading to insufficient visibility when only parts of the display are shaded during the day.
Innovation Solution
A passenger guide device with a display panel divided into regions, each with its own backlight module, and external illuminance sensors to adjust light emission brightness independently based on detected illuminance, along with a control module to manage backlight operations and display information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bus stop guide machine controls light emission brightness uniformly across the entire display region, then the device complexity is reduced, but the visibility is insufficient when only a part of the display region is shaded
Solution Approach 1:
The display panel is divided into multiple regions (e.g., four regions), each with its own independent backlight module. This segmentation allows each region to control its light emission brightness independently based on local shading conditions, improving visibility without requiring complex centralized control for the entire display
Solution Approach 2:
Each divided backlight module is equipped with its own illuminance sensor to detect local external illuminance conditions. This enables local quality adjustment where each region adapts its brightness to its specific environmental conditions (shaded or unshaded areas), rather than applying a uniform brightness setting across the entire display
2Ease of operation
If the LCD display device operates in high brightness state continuously, then the visibility is improved, but the use life is not long
Solution Approach 1:
The backlight modules dynamically adjust their light emission brightness based on real-time illuminance detection from external illuminance sensors. The control module modulates the backlight intensity according to ambient light conditions, avoiding continuous high brightness operation and thereby extending the display panel's use life while maintaining adequate visibility
Solution Approach 2:
External illuminance sensors continuously detect the ambient light conditions and provide feedback to the control module. This feedback mechanism enables automatic adjustment of backlight brightness, ensuring the display operates at optimal brightness levels rather than continuously at high brightness, thus extending component life
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
Improves contrast ratio and extends the usable life of the display panel by adjusting light emission brightness according to external illuminance and environmental conditions, ensuring optimal visibility and energy efficiency.
Implementation Method 1
a liquid crystal display module configured to display display information by the light irradiated from the divided backlight modules
Implementation Method 2
an external illuminance detector including a plurality of illuminance sensors installed spaced apart from each other along an edge outside the display screen region of the display panel and configured to detect external illuminance
Data Source
AI summary
The present invention relates to a passenger guide device for a bus stop, which includes divided backlight modules that irradiates light by dividing a display screen region, a display panel that displays display information by the light irradiated from the divided backlight modules, an external illuminance detector that is installed along an edge outside a display screen region of the display panel and detects external illuminance, and a control module that controls the display panel so that received bus service display information is displayed on the display panel, and controls operations of the divided backlight modules according to the illuminance detected by the external illuminance detector.