Transmissive Light Source Timing in Active-Area Displays
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Solution Overview
Problem
The placement of a transmissive light source on the rear surface of a display panel's active area can interfere with the electrical characteristics of semiconductor layers in pixels, leading to potential malfunctions, and existing narrow bezel designs limit the placement of sensors like proximity, illuminance, and face recognition sensors.
Innovation Solution
A display apparatus is designed with a transmissive light source disposed on the rear surface of the active area, and a timing controller manages the light emission to avoid overlap with pixel operation periods, ensuring the transmissive light source does not interfere with pixel operations and allowing sensors to be placed within the active area without increasing the bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a transmissive light source is disposed on the rear surface of the active area to reduce bezel width, then the bezel width is reduced and sensors can be placed within the active area, but the light source interferes with the electrical characteristics of semiconductor layers in pixels causing malfunctions
Solution Approach 1:
The transmissive light source operates in periodic intervals, emitting light only during periods when pixel signals are not being transmitted through the active area. The timing controller coordinates the light source activation with the pixel scanning cycles, ensuring light emission occurs during blanking periods or when corresponding pixels are not being updated, thus avoiding interference with semiconductor layer electrical characteristics while maintaining the narrow bezel design
Solution Approach 2:
The timing controller pre-coordinates the operation schedule of the transmissive light source with the pixel signal transmission schedule. Before light emission is initiated, the controller ensures that no pixel signals are being transmitted through the corresponding active area region, preventing any potential interference with the electrical characteristics of the semiconductor layers in advance
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 minimizes transistor malfunctions and allows for the placement of sensors within the active area, reducing bezel width while maintaining image quality by controlling the transmissive light source's operation to avoid interference with pixel signals.
Implementation Method 1
a transmissive light source disposed on a rear surface of an active area of a display panel
Implementation Method 2
a transmissive light source disposed on a rear surface of an active area of a display panel having a light transmitting characteristic
Data Source
AI summary
A display apparatus comprises 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.