Transmissive Display Light Timing to Prevent Pixel Transistor Malfunction
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Solution Overview
Problem
The disposal of a transmissive light source in the active area of a display panel can affect the electrical characteristics of semiconductor layers of transistors, leading to potential malfunctions in pixels.
Innovation Solution
A display apparatus is designed with a transmissive light source disposed on the rear surface of the display panel, and a timing controller that controls the transmissive light source to not emit light during specific periods of image data input and pixel light emission, thereby minimizing interference with the pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a transmissive light source is disposed in the active area of the display panel, then the bezel width can be reduced and sensors can be placed within the active area, but the electrical characteristics of semiconductor layers of transistors are affected causing malfunctions in pixels
Solution Approach 1:
The patent applies preliminary action by controlling the transmissive light source to be turned off during critical periods when image data is being input to pixels or when pixels are emitting light. This preventive timing control avoids the harmful effects of light exposure to semiconductor layers before malfunctions can occur, while still allowing the light source to be positioned in the active area for bezel reduction purposes
Solution Approach 2:
The patent implements periodic action by operating the transmissive light source in a periodic manner - turning it off during specific periods (image data input period and pixel light emission period) and allowing it to operate during other periods. This periodic control pattern resolves the contradiction by restricting light emission to time windows when it does not interfere with transistor operation
2Adaptability or versatility
If a transmissive light source is disposed in the active area, then sensors can be integrated within the display area, but interference with pixel operation and transistor electrical characteristics occurs
Solution Approach 1:
The patent uses periodic action to control the transmissive light source, turning it off during image data input and pixel light emission periods. This allows sensors to be integrated in the active area while minimizing light interference with pixel operation through time-based separation of functions
Solution Approach 2:
The timing controller monitors the operational state of pixels and adjusts the transmissive light source accordingly, creating a feedback mechanism that prevents harmful light exposure during critical pixel operations while maintaining sensor functionality during safe periods
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 configuration effectively suppresses the occurrence of transistor malfunctions in pixels even when the transmissive light source overlaps with the active area, while also allowing for a narrower bezel width by enabling the placement of sensors like proximity, illuminance, and face recognition sensors within the active area.
Implementation Method 1
a transmissive light source disposed on a rear surface of a display panel and configured to supply light emitted through at least a part of the active area
Implementation Method 2
the transmissive light source affects the electrical characteristics of semiconductor layers of transistors disposed in a plurality of pixels disposed in the active area
Data Source
AI summary
A display apparatus includes a display panel including a pixel area in which a plurality of pixels is disposed and a peripheral area outside the pixel area; a transmissive light source disposed in a first area of the pixel area; and a timing controller which controls the transmissive light source not to emit light when pixels disposed corresponding to the first area of the pixel area among the plurality of pixels are present in at least one of an image data input period and a pixel light emission period.