Rotating LED Display Encoder for Frame Distortion Control
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Solution Overview
Problem
Rotatable display apparatuses face challenges in maintaining constant speed control of the rotary portion, leading to frame distortion due to changes in rotational speed, and require efficient synchronization of the image with the light source position.
Innovation Solution
A rotatable display apparatus with a disc-shaped encoder featuring a light emitter, light receiver, and a scaler with slits, which allows for precise synchronization and reduced space occupation, enabling efficient arrangement of components and improved frame stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant speed control is implemented by detecting rotational speed and adjusting motor torque, then rotational speed stability is improved, but the response time exceeds the display frame time causing inability to maintain constant speed
Solution Approach 1:
The patent replaces the mechanical speed control system with an optical encoding system. Instead of using mechanical sensors to detect rotational speed and adjust motor torque, the system uses an optical encoder with slits that rotates with the display module to provide position feedback. This optical feedback system enables precise synchronization of the light source scanning with the display frame without the delays inherent in mechanical control systems.
Solution Approach 2:
The patent implements a feedback mechanism where the optical encoder continuously monitors the rotational position of the display module and sends this information back to the control system. This feedback allows the system to synchronize the light source scanning timing with the display frame rate, maintaining constant effective speed without requiring direct mechanical speed control.
2Measurement precision
If an encoder with multiple light emitters and receivers is used for precise synchronization, then synchronization precision is improved, but the space occupied by the encoder increases
Solution Approach 1:
The patent segments the encoder function into a simple disc-shaped structure with slits rather than using multiple complex light emitters and receivers. The encoder disc is divided into multiple angular segments (slits) that provide sufficient synchronization information without requiring a bulky multi-component assembly. This segmentation approach maintains precision while reducing volume.
Solution Approach 2:
The patent extracts the essential synchronization function from a complex encoder system and implements it through a minimalistic disc with slits. By taking out only the necessary rotational position detection capability and discarding unnecessary components (multiple light emitters, complex receiver arrays), the system achieves sufficient synchronization precision with minimal space occupation.
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 reduces frame distortion and improves the synchronization of the image with the light source, allowing for more precise control of the rotary portion's speed and efficient spatial configuration, thereby enhancing the display's performance.
Implementation Method 1
a light emitter configured to continuously emit light
Implementation Method 2
a light receiver configured to receive the light emitted from the light emitter through at least two paths
Data Source
AI summary
The present invention is applicable to the display apparatus-related technical field, and relates to, for example, a rotating display apparatus using a light-emitting diode (LED) which is a semiconductor light-emitting device. The present invention provides the rotating display apparatus comprising: a fixing portion including a motor; a rotating portion located on the fixing portion and rotated by the motor; a light source module including a light-emitting element array coupled to the rotating portion and displaying an image by using an afterimage caused by the rotation of the rotating portion; and an encoder positioned between the fixing portion and the rotating portion to synchronize an image displayed by the light-emitting element array at a predetermined position when the rotating portion rotates, wherein the encoder comprises: a light-emitting portion continuously emitting light; a light-receiving portion receiving light emitted from the light-emitting portion through at least two paths; and a disk-shaped scaler disposed between the light-emitting portion and the light-receiving portion and having a plurality of slits formed along the circumferential direction.