OLED Heating Package Test Apparatus for Brightness Uniformity
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Solution Overview
Problem
Optical characteristic deviations in OLED display devices lead to non-uniform image quality, necessitating adjustments in power source voltage during shipping to compensate for pixel-specific variations in brightness and light emission.
Innovation Solution
A heating package test apparatus that measures temperature and light characteristics across divided regions of a display device using a heating unit, optical window, temperature measurement unit, and brightness measurement unit, with infrared filters and color filters to assess brightness uniformity and generate compensation data for adjusting pixel brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If power source voltage is adjusted to compensate for optical characteristic deviation, then brightness uniformity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies preliminary action by measuring and storing compensation values for each pixel during the manufacturing process. These compensation values are pre-calculated based on optical characteristic deviations and stored in a lookup table or memory, allowing the display device to automatically apply corrections during operation without requiring complex real-time processing or additional hardware components.
2Illumination intensity
If each pixel is measured and compensated individually, then brightness uniformity is improved, but measurement and processing time increase
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple measurement regions and using a movable measurement head to systematically scan through different pixel groups. This allows parallel or sequential measurement of multiple pixels without requiring all pixels to be measured simultaneously, thereby reducing overall measurement time while still achieving individual pixel compensation.
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 apparatus ensures improved image quality uniformity by applying heat to specific regions, measuring temperature and brightness, and generating compensation data to adjust pixel brightness, thereby enhancing the overall brightness uniformity of the OLED display device.
Implementation Method 1
a heating unit configured to apply heat to a divided region of the display device
Implementation Method 2
a temperature measurement unit configured to measure a temperature of the divided region of the display device by using the light incident through the optical window
Implementation Method 3
The temperature measurement unit can include: an infrared filter capable of passing only infrared light of the light incident through the optical window
Implementation Method 4
a plurality of photodiodes configured to measure a brightness of the divided region of the display device by receiving the lights which have passed through the plurality of color filters
Implementation Method 5
The light transfer unit can include: a light-concentrating unit configured to concentrate the light incident through the optical window
Data Source
AI summary
A heating package test apparatus and a method of operating the same are disclosed. In one aspect, the apparatus includes a plurality of heating package testers configured to i) measure temperatures of a plurality of divided regions included in a display device and ii) one or more characteristics of light output from the divided regions. Each of the heating package testers includes a heater configured to apply heat to a selected one of the divided regions of the display device, an optical window configured to receive the output light, a temperature measurement circuit configured to measure a temperature of the selected divided region of the display device based on the received light, and a brightness measurement circuit configured to measure a brightness change of the selected divided region based on the received light.