Input Output Device Flicker Reduction via Periodic Switching
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Solution Overview
Problem
Conventional input/output devices suffer from insufficient image quality due to flickering caused by frequent changes in luminance, which degrade the displayed image.
Innovation Solution
The input/output device incorporates a pixel area with light emission circuits and photodetection circuits, featuring a switching element that controls luminance and generates optical data, reducing adverse environmental light effects and increasing switching speed to minimize flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display data in the plurality of light emission circuits are refreshed to maximize the luminance of the plurality of light emission circuits, then the luminance of the light emission circuits is improved, but the displayed image changes temporarily and flickers, reducing the quality of the displayed image
Solution Approach 1:
The patent applies periodic action by implementing a dual-mode operation where the light emission circuits alternately perform display refresh operations and read operations. During display refresh, luminance is maximized; during read operations, the same circuits perform photodetection. This periodic switching between functions eliminates continuous flicker while maintaining high luminance during display periods, as the system cycles through distinct operational phases rather than continuously adjusting luminance.
Solution Approach 2:
The patent implements universality by enabling the light emission circuits to serve multiple functions: they act as display circuits during refresh operations and as photodetection circuits during read operations. This multi-functionality allows the same hardware components to perform both luminance maximization and image reading without requiring separate dedicated circuits, thereby improving overall system efficiency while maintaining image stability through coordinated operation modes.
2Speed
If the switching element switches the voltage applied between the two terminals of the light emitting element frequently, then the switching speed of the displayed image is increased, but the flicker in the displayed image increases, reducing the quality of the displayed image
Solution Approach 1:
The patent resolves this contradiction by implementing periodic action through coordinated control of the switching element. Instead of frequent continuous switching that causes flicker, the system uses periodic switching synchronized with the alternation between display refresh and read operations. The switching element operates at lower frequency during each mode but maintains high switching speed capability, eliminating flicker while preserving fast response when needed.
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 approach enhances the quality of the displayed image by reducing flicker and maintaining image stability, thereby improving overall image quality.
Implementation Method 1
The light emitting element emits light in accordance with the current flowing between the two terminals
Implementation Method 2
a photodetection circuit provided in the pixel area and configured to generate optical data that is a voltage having a value corresponding to the intensity of incident light
Data Source
AI summary
An input/output device includes a pixel area; a light emission circuit provided in the pixel area and configured to emit light; and a photodetection circuit provided in the pixel area and configured to generate a voltage having a value corresponding to an intensity of incident light. The light emission circuit includes a drive transistor and a light emitting element. The light emitting element includes a first current terminal electrically connected to the source or the drain of the drive transistor and a second current terminal to which a first voltage is input, and emits light in accordance with a current flowing between the first and second current terminals. The light emission circuit includes a switching element including a first terminal to which a second voltage is input, and a second terminal electrically connected to the first current terminal of the light emitting element.