Optical Module Freeform Lens Under-Display Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Camera modules face challenges in achieving high resolution and improved illuminance, especially when positioned under display panels, leading to issues like image quality deterioration and reduced brightness due to light loss.
Innovation Solution
An optical system with a specific configuration of five lenses, including a fourth lens with a freeform surface, optimized by equations to control light distribution and aberration, enhancing relative illumination and miniaturization without increasing the aperture size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera is placed at the bottom of the display to achieve miniaturization, then the device size is reduced, but light loss occurs due to the display panel causing deterioration in image quality and reduced brightness
Solution Approach 1:
The optical system is divided into multiple lenses (first lens through sixth lens) with specific refractive powers and arrangements. The fourth lens is specifically designed with a freeform surface to control light distribution, segmenting the light transmission path to compensate for losses from the display panel while maintaining compact device dimensions.
2Measurement precision
If multiple lenses with positive and negative refractive powers are used to achieve high resolution, then the resolution is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the optical system including the refractive powers of individual lenses, the thickness of the fourth lens, the interval between lenses, and the freeform surface parameters (Sag values in X and Y directions). By precisely controlling these parameters, the system achieves high resolution while managing complexity through mathematical optimization rather than simply adding more components.
3Illumination intensity
If the aperture size is increased to improve illuminance, then the brightness is improved, but the device size increases
Solution Approach 1:
The fourth lens employs a freeform surface with specific Sag values in X and Y directions rather than a traditional spherical or planar surface. This curved freeform surface enables precise control over light distribution and illuminance enhancement without requiring an increased aperture size, thus maintaining compact device dimensions while improving brightness.
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 optical system achieves improved optical characteristics, including enhanced resolution and illuminance, while maintaining a compact size, effectively addressing light loss issues and reducing the need for post-processing adjustments.
Implementation Method 1
an optical system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along an optical axis from the object side to the sensor side
Data Source
AI summary
A optical module according to an embodiment includes a sensor and an optical system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis in the direction from the object side to the sensor side, at least one of the object side surface or the sensor side surface of the fourth lens includes a freeform surface.