Apparatus for displaying a hologram

Patent metadata

Field	Value
Publication number	US-10816932-B2
Application number	US-201314086065-A
Country	US
Kind code	B2
Filing date	Nov 21, 2013
Priority date	Dec 26, 2012
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

An apparatus for displaying a hologram comprises: a hologram display panel that represents light having the hologram images to an observer; a detecting camera that decides a position of the observer; a deflector that forms a prism pattern to refract the light corresponding to the detected position of the observer; and a deflector driver that supplies a driving voltage corresponding to a inclined angle for forming the prism pattern, wherein the deflector includes: a plurality of first electrodes running to a first direction and divided into a plurality of electrode groups; a plurality of connection electrodes running to a second direction crossing with the first direction, and connecting same numbered first electrodes of the electrode groups, wherein each end of the connection electrodes forms a pad portion; and a second electrode facing to the plurality of the first electrodes with a liquid crystal cell therebetween.

First claim

What is claimed is:

1. An apparatus for displaying hologram images, comprising:
a hologram display panel that represents light having the hologram images to an observer;
a detecting camera configured to acquire images of the observer;
a light path deflecting panel, including:
a plurality of first electrodes extending in a first direction and divided into a plurality of first electrode groups in a display area of the light path deflecting panel, each first electrode group corresponding to a pitch distance of the light path deflecting panel and including a same number of first electrodes;
a plurality of connection electrodes extending in a second direction crossing with the first direction in a non-display area of the light path deflecting panel, wherein one end of each of the connection electrodes forms a pad portion at one end side of a substrate, each of the connection electrodes connected to first ends of corresponding first electrodes of each of the plurality of first electrode groups;
a plurality of connection lines extending in a second direction crossing with the first direction in a non-display area of the light path deflecting panel, wherein another end of each of the connection electrodes forms a pad portion at another end side of the substrate, each of the connection lines connected to second ends of corresponding first electrodes of each of the plurality of first electrode groups; and
a second electrode facing the plurality of the first electrodes with a liquid crystal cell therebetween;

wherein the plurality of connection lines is positioned in the non-display area of the light path deflecting panel,
wherein the second end is opposite to the first end of the first electrodes in the non-display area of the light path deflecting panel, and
wherein one first electrode of the first electrode groups, one connection line of the connection line groups and one connection electrode of the connection electrodes groups are connected in a closed loop shape.

2. The apparatus according to the claim 1 , wherein the first electrodes include a transparent conductive material and the connection electrodes include metal material.

3. The apparatus according to the claim 2 , wherein the light path deflecting panel further includes: a first substrate and a second substrate facing to each other with the liquid crystal cell therebetween,
wherein the first electrodes are disposed on the first substrate, a first insulating layer is deposited on the first electrodes, the connection electrodes are disposed on the first insulating layer, and a second insulating layer is deposited over the connection electrodes,
wherein the second electrode is disposed on the second substrate, and a third insulating layer is deposited on the second electrode, and
wherein the light path deflecting panel has the display area and the non-display area surrounding the display area, and the connection electrodes are connected to the corresponding first electrodes through contact holes that penetrate the first insulating layer and expose portions of the first electrodes, at the non-display area.

4. The apparatus of claim 1 , wherein a driving voltage applied each of the plurality of connection electrodes is selected between monotonically increasing or monotonically decreasing with connection electrode number to yield a ramp voltage pattern on the first connection electrodes within each pitch distance of the light path deflecting panel to produce refraction and zero voltage for no refraction.

5. The apparatus of claim 1 , further comprising a light path deflecting panel driver that includes a look-up table having a plurality of groups of driving voltages, each of the groups of driving voltages including driving voltages to be supplied to the light path deflecting panel at corresponding calculated positions of the observer.

6. The apparatus of claim 1 , wherein adjacent first electrodes are spaced apart from one another by a distance of less than 2 micrometers.

7. The apparatus of claim 1 , wherein the plurality of connection electrodes and the plurality of connection lines are positioned in the non-display area of the light path deflecting panel.

8. The apparatus of claim 3 , wherein each of the first insulating layer and the second insulating layer includes at least one of silicon nitride or silicon oxide.

Assignees

• Lg Display Co Ltd

Inventors

• Choi Dongjun
• Park Joonyoung
• Park Juseong
• Yoon Minsung
• Choe Wooyoung

Classifications

• G02B27/0093 Primary

  with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking · CPC title

• G03H1/04 Primary

  Processes or apparatus for producing holograms (G03H1/26 takes precedence) · CPC title

• G02F1/291

  Two-dimensional analogue deflection · CPC title

• G02F1/29

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• G03H1/2294

  Addressing the hologram to an active spatial light modulator · CPC title