OLED Array Substrate for Uniform Optical Fingerprint Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display screens with optical fingerprint identification functions experience uneven brightness between the identification area and other display areas, affecting the overall display effect due to the high brightness mode's significant impact on the OLED's lifetime, leading to noticeable brightness differences that can be perceived by the human eye.
Innovation Solution
The OLED panel design includes a light source specifically for optical fingerprint identification with a thicker transflective electrode and potentially a thicker hole transport layer in the light emitting unit, compared to the sub-pixels, to enhance luminous efficiency and reduce power consumption, while maintaining spectral peak stability, and using green light emitting materials for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical fingerprint identification area operates in high brightness mode to ensure sufficient light intensity for fingerprint recognition, then the light intensity is improved, but the OLED lifetime is significantly reduced and brightness unevenness occurs
Solution Approach 1:
The patent applies local quality by differentiating the electrode structure between the optical fingerprint identification area and the display area. Specifically, the transflective electrode in the light emitting unit has a greater thickness (6-8 nm thicker) than in regular sub-pixels, creating localized structural optimization that enhances luminous efficiency and reduces power consumption specifically in the fingerprint identification area without affecting other regions
Solution Approach 2:
The patent changes physical parameters of the OLED structure to resolve the contradiction. By increasing the thickness of the transflective electrode and adjusting the hole transport layer thickness in the light emitting unit, the patent optimizes light extraction efficiency and reduces operating power consumption, allowing the OLED to maintain sufficient brightness for fingerprint recognition while reducing stress on the OLED and extending its lifetime
2Adaptability or versatility
If the optical fingerprint identification area operates in high brightness mode, then the fingerprint recognition function is achieved, but uneven brightness appears between the identification area and other display areas
Solution Approach 1:
The patent implements local quality by creating a specialized light emitting unit structure in the optical fingerprint identification area with enhanced transflective electrode thickness and adjusted hole transport layer. This localized structural modification optimizes light emission characteristics specifically for fingerprint recognition while maintaining normal display characteristics in other areas, thereby preventing visible brightness unevenness
Solution Approach 2:
The patent uses a light emitting unit that replicates the essential OLED structure but with modified electrode parameters. The light emitting unit copies the basic sub-pixel architecture while incorporating thicker transflective electrode and adjusted organic light emitting layer thickness, creating a functional copy optimized for high efficiency light emission needed for fingerprint recognition without disrupting overall display uniformity
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 design effectively prevents uneven brightness, ensuring a good overall visual effect by reducing power consumption and enhancing luminous efficiency of the light emitting unit, thereby extending the OLED's lifetime and maintaining display quality.
Implementation Method 1
OLED (Organic Light Emitting Diode) is widely used in high-performance display as a current-type light-emitting device
Implementation Method 2
the thickness of the first electrode is greater than the thickness of the third electrode by 6 to 8 nm
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The present disclosure provides an array substrate and a method for preparing the same, and a display device and a driving method thereof. The array substrate includes a plurality of sub-pixels arranged in an array and a light source, the array substrate is further provided with an optical fingerprint identification area, and the optical fingerprint identification area includes at least part of the sub-pixels and at least part of the light source.