OLED Display Panel Luminance Compensation Using Photosensitive Feedback
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Solution Overview
Problem
OLED products experience a luminance imbalance over time, particularly with blue light-emitting materials, leading to color shift and affecting display quality due to varying luminous efficiency of red, green, and blue colors.
Innovation Solution
A display panel with a compensation unit that includes a photosensitive assembly and light-emitting compensation assembly, where the resistance of the photosensitive assembly is adjusted by light from the compensation assembly, altering current distribution to maintain luminance of the main light-emitting units, thereby compensating for luminance attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED light-emitting materials are used, then high color saturation and fast response speed are achieved, but luminous efficiency decreases over time leading to color shift
Solution Approach 1:
The patent implements a feedback mechanism where the luminance of the reference pixel is continuously monitored and fed back to the driving circuit. The driving circuit adjusts the drive signal to the active pixel based on the difference between the reference pixel luminance and the active pixel luminance, thereby compensating for the luminance decay over time and maintaining consistent color output throughout the OLED's operational life
Solution Approach 2:
The patent changes the electrical parameters (drive voltage, drive current) of the pixel circuit dynamically based on the aging state of the OLED. By adjusting these parameters in real-time according to the measured luminance differences, the system compensates for the changing luminous efficiency of the light-emitting materials over time
2Illumination intensity
If blue light-emitting materials are used, then color saturation is improved, but luminous efficiency decreases faster than red and green colors
Solution Approach 1:
The patent introduces a reference pixel with the same light-emitting materials as the active pixel, creating a local control mechanism. This reference pixel serves as a baseline for measuring and compensating the luminance decay specific to each pixel's light-emitting material, allowing for localized compensation that addresses the faster degradation of blue light-emitting materials
Solution Approach 2:
The driving circuit uses feedback from the reference pixel to dynamically adjust the drive signal to the active pixel. This feedback loop specifically compensates for the accelerated luminance decay of blue light-emitting materials by continuously monitoring and adjusting based on the reference pixel's performance, thereby maintaining color saturation and luminance stability
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 solution effectively maintains luminance of main light-emitting units, reducing color shift and improving display quality by ensuring consistent luminance across red, green, and blue colors over the lifespan of the OLED product.
Implementation Method 1
the light-emitting compensation assembly is electrically connected to the sub-pixel driving assembly; when the sub pixel driving assembly drives the light-emitting compensation assembly to emit light
Implementation Method 2
light from the light-emitting compensation assembly irradiates the photosensitive assembly to adjust a resistance of the photosensitive assembly
Data Source
AI summary
Disclosed are a display panel and a display apparatus. The display panel includes a driving backplane, a light-emitting functional layer and a pixel definition layer. The driving backplane includes a main pixel driving unit, the pixel definition layer includes a plurality of pixel openings, and the light-emitting functional layer includes a plurality of main light-emitting units. At least part of the main light-emitting unit is located in the corresponding pixel opening, and the main light-emitting unit is electrically connected to the main pixel driving unit. The driving backplane further includes a compensation unit including a photosensitive assembly, a light-emitting compensation assembly and a sub pixel driving assembly, in which the photosensitive assembly is electrically connected to the main pixel driving unit. At least part of the light-emitting compensation assembly is located in the corresponding pixel opening, and the light-emitting compensation assembly is electrically connected to the sub-pixel driving assembly.