Integrated Photo Sensor Circuit for Flat Panel Brightness Control
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Solution Overview
Problem
Existing flat panel displays (FPDs) face challenges in controlling image brightness effectively due to high power consumption when using external photo sensors, and internal sensors have limited output, affecting visibility and power efficiency.
Innovation Solution
A built-in photo sensor circuit comprising transistors, photo diodes, and capacitors that senses peripheral light to control image brightness, improving output stability and reducing power consumption by integrating the sensing functionality within the FPD panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a photo sensor is attached as an additional external chip to sense peripheral light, then the brightness control function is achieved, but the power consumption increases due to requiring additional power source transmission
Solution Approach 1:
The patent merges the photo sensor functionality directly into the FPD panel structure by integrating the photo sensor, transistors, and capacitors as internal components rather than using a separate external chip. This integration eliminates the need for additional power source transmission while maintaining the brightness control function, thereby resolving the contradiction between operational capability and power consumption.
2Use of energy by moving object
If a photo sensor is provided inside the FPD panel, then the power consumption is reduced, but the output of the photo sensor becomes small affecting operational effectiveness
Solution Approach 1:
The patent introduces intermediate components including multiple transistors (first through fifth transistors) and capacitors (first and second capacitors) that act as mediators to amplify and process the signal from the integrated photo sensor. These intermediary elements enhance the photo sensor's output capability while maintaining the low power consumption advantage of internal integration, thus resolving the contradiction between power efficiency and sensor output reliability.
3Illumination intensity
If the brightness of the displayed image is increased to improve visibility in high peripheral light conditions, then the visibility is improved, but the power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the integrated photo sensor continuously monitors peripheral light conditions and automatically adjusts the displayed image brightness through the transistor-capacitor circuit network. This feedback system ensures optimal visibility by matching display brightness to ambient light levels, thereby improving visibility when needed while minimizing power consumption during normal operating conditions.
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 enhances the stability and output of the photo sensor, allowing for effective brightness control of FPDs, improving visibility and reducing power consumption by integrating the sensing functionality within the panel, thus addressing the limitations of external and internal sensors.
Implementation Method 1
a photo diode whose first electrode is coupled to the first source of power and whose second electrode is coupled to the second node
Data Source
AI summary
A photo sensor capable of improved output used in a flat panel display (FPD). The photo sensor includes a first transistor coupled to a first power source, a first node, and a second node. A photo diode is also provided, as well as a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a first capacitor.