Display device

Patent metadata

Field	Value
Publication number	US-12333968-B2
Application number	US-202118713576-A
Country	US
Kind code	B2
Filing date	Nov 26, 2021
Priority date	Nov 26, 2021
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

The present disclosure is to provide a structure for improving the image quality of a rotary display device by using an afterimage effect of a light source, comprising: a fixed module comprising a motor; a rotary module which comprises a plurality of LED bars having a plurality of LEDs mounted thereon, and is rotated by the motor; a control unit which controls the plurality of LED bars to output an image; and a location detection part that detects the locations of the plurality of LEDs according to rotation, wherein the control unit may output the image by synchronizing pixel output locations with the locations of the plurality of LEDs detected by the location detection part.

First claim

The invention claimed is:

1. A display device comprising:
a fixing module including a motor;
a rotation module including a plurality of light emitting diode (LED) bars equipped with a plurality of LEDs and rotated by the motor;
a control unit configured to control the plurality of LED bars to output an image; and
a location detecting unit configured to detect locations of the plurality of LEDs according to a rotation of the rotation module,
wherein the control unit is configured to output the image by synchronizing pixel output locations with the detected locations of the plurality of LEDs through the location detecting unit,
wherein the location detecting unit includes:
a scale unit installed on the fixing module and including a plurality of slits; and
a reading unit configured to recognize light passing through the plurality of slits or light reflected from a bridge between the plurality of slits to detect the locations of the plurality of LEDs, and

wherein the control unit is further configured to calculate absolute locations of the plurality of LEDs based on the detected locations of the plurality of LEDs and synchronize to the pixel output locations based on the calculated absolute locations.

2. The display device of claim 1 ,
wherein the reading unit and the scale unit are installed separately.

3. The display device of claim 1 , wherein the number of the plurality of slits is equal to horizontal number of an image resolution of the output image.

4. The display device of claim 1 , wherein the number of the plurality of slits is one more than a horizontal number of an image resolution of the output image.

5. The display device of claim 1 , wherein the scale unit is disposed on an outer periphery of at least a portion of the fixing module.

6. The display device of claim 1 , wherein the scale unit is installed along an outer circumference of the motor among the fixing module.

7. The display device of claim 1 , wherein the control unit is installed in the rotation module together with the reading unit.

8. The display device of claim 2 , further comprising:
a communication unit configured to transmit a result of the recognition by the reading unit to the control unit,
wherein the reading unit is installed in the fixing module and the scale unit is installed in the rotation module.

9. The display device of claim 1 , wherein the control unit is configured to receive location information of the locations of the plurality of LEDs from the location detecting unit.

10. The display device of claim 1 , wherein the control unit includes:
a memory control unit configured to acquire an input image frame,
a timing control unit configured to obtain output timing of the input image frame,
an image signal processing unit configured to process a signal so that the input image frame is output at the output timing, and
an LED bar control unit configured to control the plurality of LEDs to output light according to the signal processing, and
wherein the LED bar control unit is configured to receive a signal for synchronizing pixel output locations with the locations of the plurality of LEDs from the location detecting unit.

Assignees

• Lg Electronics Inc

Inventors

• Lee Sungwhan
• Kim Taeho

Classifications

• G09G2360/14

  Detecting light within display terminals, e.g. using a single or a plurality of photosensors · CPC title

• G09G2320/02

  Improving the quality of display appearance · CPC title

• G02B30/56

  by projecting aerial or floating images · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/005

  forming an image using a quickly moving array of imaging elements, causing the human eye to perceive an image which has a larger resolution than the array, e.g. an image on a cylinder formed by a rotating line of LEDs parallel to the axis of rotation · CPC title