Pixel Driving Circuit Blue Light Suppression Limit Circuit
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Solution Overview
Problem
Current blue light suppression technologies in display devices require additional hardware and software resources, increasing production costs and complexity, and do not effectively mitigate health risks associated with long-term blue light exposure.
Innovation Solution
A pixel driving circuit with a limit circuit connected between the data line and a reference voltage line, which limits data voltage when it exceeds a threshold, reducing blue light intensity in the output spectrum without the need for additional film materials or image processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If film-like materials are used to absorb reflected blue light, then blue light suppression is achieved, but production cost increases due to additional process steps
Solution Approach 1:
The patent replaces the mechanical/optical approach of using film-like materials to absorb blue light with an electrical control approach. A limit circuit is introduced that uses transistors to electrically limit the data voltage supplied to the blue sub-pixel, thereby suppressing blue light emission through electrical means rather than physical absorption films.
Solution Approach 2:
The patent changes the operating parameter (data voltage) of the blue sub-pixel by introducing a voltage threshold through the limit circuit. When the data voltage exceeds this threshold, the limit circuit activates to clamp the voltage, effectively changing the electrical parameter to control blue light emission intensity without requiring additional optical films.
2Object-affected harmful factors
If image processors are used to adjust image signals, then blue light suppression is achieved, but device complexity increases due to additional hardware and software resources
Solution Approach 1:
The patent extracts the blue light suppression function from the complex image processing system and implements it locally at the pixel level through a simple limit circuit. This eliminates the need for complex image processors and software algorithms by providing a dedicated electrical circuit that automatically limits voltage to blue sub-pixels based on a predefined threshold.
Solution Approach 2:
The limit circuit performs self-service by automatically limiting the data voltage to the blue sub-pixel without requiring external control signals or complex processing. The circuit uses a transistor configured to activate when the voltage threshold is exceeded, providing autonomous blue light suppression at the pixel level without involving higher-level image processing systems.
3Object-affected harmful factors
If additional film materials are used for blue light absorption, then blue light suppression is achieved, but device structure becomes more complex
Solution Approach 1:
The patent replaces the physical/optical structure of additional film materials with an electrical control structure. Instead of adding layers of absorptive films to the display stack, the invention introduces a limit circuit with transistors that electrically controls the voltage supplied to blue sub-pixels, thereby suppressing blue light through electrical means rather than physical filtration.
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
This solution effectively suppresses blue light emission, reducing health risks while simplifying the display device structure and saving costs by utilizing existing voltage signals and eliminating the need for additional hardware and software resources.
Implementation Method 1
a first transistor having a control electrode connected to the data line, a first electrode connected to the reference voltage line, and a second electrode connected to the data line. The voltage threshold is related to a turn-on voltage of the first transistor and the fixed DC voltage.
Data Source
AI summary
A pixel driving circuit includes a pixel unit including a blue sub-pixel connected to a data line to receive a data voltage, and a limit circuit connected between the data line and a reference voltage line configured to transfer a fixed DC voltage, the limit circuit being configured to limit the received data voltage when the received data voltage exceeds a voltage threshold.