Movable Sensor Bar for Luminance Compensation in Display Devices
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Solution Overview
Problem
Current display devices with self-luminous panels face challenges in maintaining luminance uniformity due to variations in characteristic values of subpixels over time, requiring complex subpixel structures and signal wiring for compensation, which complicates the sensing and driving processes.
Innovation Solution
A display device with a movable sensor structure outside the panel that senses luminance and compensates for deviations without a complex subpixel structure or signal wiring, using a moving bar with sensor modules and a sensing controller to accurately determine and adjust luminance across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex subpixel structure and signal wiring structure are used to sense luminance deviation, then luminance compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the sensing function from the subpixel structure itself and places external sensors in a separate module. The sensors are positioned to face the display panel from outside, allowing luminance sensing without requiring complex internal wiring or subpixel modifications. This separation resolves the contradiction by achieving accurate luminance measurement without increasing subpixel structure complexity.
Solution Approach 2:
The patent introduces an intermediary sensing module that acts as a mediator between the display panel and the control system. This external sensor module captures luminance information from the display panel and transmits it to the controller, which then performs compensation. This intermediary approach enables accurate luminance sensing without requiring complex signal wiring within the subpixel structure.
2Measurement precision
If a complex subpixel structure and signal wiring structure are used to sense luminance deviation, then luminance compensation accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
By extracting the sensing function to an external module, the patent simplifies the sensing driving process. The external sensors can be controlled independently from the display panel's internal circuitry, allowing for simpler drive signals and reduced operational complexity while maintaining accurate luminance measurement capability.
Solution Approach 2:
The external sensor module operates autonomously to sense luminance and provides feedback to the controller. This self-service capability reduces the burden on the display panel's internal circuits and simplifies the overall sensing driving operation, as the sensors independently perform measurement and transmission functions without requiring complex coordinated control.
3Productivity
If circuit elements are driven for extended periods, then productivity is improved, but luminance uniformity deteriorates due to characteristic value changes
Solution Approach 1:
The patent implements a feedback mechanism where external sensors continuously monitor the luminance output of the display panel and transmit this information to the controller. Based on this feedback, the controller adjusts the driving signals to compensate for characteristic value changes in the circuit elements, thereby maintaining luminance uniformity even during extended driving periods and improving long-term productivity.
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 allows for high aperture ratio and resolution displays with simplified subpixel structures and signal wiring, enabling accurate luminance compensation and improved image quality without complex sensing driving.
Implementation Method 1
a plurality of sensor modules mounted on the moving bar to face the viewing surface of the display panel... receive sensing values of each of the plurality of sensor modules
Data Source
AI summary
A display device is disclosed that provides a compensation function using a movable sensor structure. The display device may sense luminance characteristics of subpixels and reduce or eliminate luminance deviations between subpixels without performing complicated sensing driving on subpixels of the display panel. The display device includes: a display panel including data lines, a gate lines, and subpixels, each of the subpixels including a light emitting device and a driving transistor; a housing protecting the display panel; a moving bar installed in the housing so as to be movable and moving at a front of a viewing surface of the display panel; sensor modules mounted on the moving bar to face the viewing surface of the display panel; and a sensing controller configured to control movement of the moving bar, control an operation of the sensor modules, and receive sensing values of each of the sensor modules.