# US 2014/0192173 A1 · Holographic liquid crystal display, stereo display method, and stereo display system

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- Number: US 2014/0192173 A1
- Document ID: US20140192173A1
- Status: Published application
- Kind: A1
- Application number: 14/128,670
- Filed: 2012-11-30
- Published: 2014-07-10
- Earliest claimed: 2012-04-25
- Assignees: Beijing Boe Optoelectronics Technologies Co., Ltd.
- Applicants: Beijing Boe Optoelectronics Technologies Co., Ltd.
- Inventors: Yangbing Yu; Zhe Shi
- Web page: https://patentgrep.com/patent/US20140192173A1

## CPC

- H04N 13/398: Synchronisation thereof; Control thereof
- G03B 35/18: by simultaneous viewing
- G09G 3/002: {to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT}
- G09G 3/003: {to produce spatial visual effects}
- G09G 3/36: using liquid crystals
- G09G 3/3618: {with automatic refresh of the display panel using sense/write circuits}
- G02F 1/13471: {in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells (G02F1/13475 takes precedence)}
- G09G 2300/023: Display panel composed of stacked panels
- H04N 13/363: using image projection screens (volumetric display H04N13/388)
- H04N 13/388: Volumetric displays, i.e. systems where the image is built up from picture elements distributed through a volume
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A holographic LCD stereo display system is disclosed. The holographic LCD stereo display system comprises: a holographic projection device (11), a signal synchronous generator (12) and a holographic LCD having multiple layer of LCD panels. In the system, the holographic projection device (11) decomposes a stored holographic stereo image to obtain decomposes images and projects the decomposed images to the holographic LCD (13) in sequence; the holographic LCD (13) controls, according to a synchronous signal received from the signal synchronous generator (12), the multiple layers of LCD panels to display projected decomposed images in sequence; and when a frequency at which the holographic LCD (13) displays the decomposed images is not less than 46 Hz, with visual persistence effect of human eyes, the decomposed images become real three-dimensional stereo images in human brains, so that the holographic stereo three-dimensional images are presented stereo images in the holographic LCD (13), thereby achieving an effect of vividly displaying real naked-eye three-dimensional images. Further disclosed are a holographic LCD and a stereo display method.

## Claims

### Claim 1

A holographic LCD, comprising a layer-by-layer scan synchronous driver circuit and multiple LCD panels, wherein:
the layer-by-layer scan synchronous driver circuit determines a refresh frequency at which decomposed images obtained by decomposing the holographic stereo image are projected, controls the multiple LCD panels to display in sequence the decomposed images projected, and in a refresh period, controls only one panel of the multiple LCD panels to display the decomposed image projected and other panels of the multiple LCD panels to be in a fully transmissive state according to the refresh frequency;
the LCD panel displays the decomposed images projected or enters the fully transmissive state under the controls of the layer-by-layer scan synchronous driver circuit.

### Claim 2 (depends on 1)

The holographic LCD according to claim 1, wherein a light guide film plate is interposed between adjacent two panels of the multiple LCD panels.

### Claim 3 (depends on 1)

The holographic LCD according to claim 1, wherein the multiple LCD panels are respectively connected to the layer-by-layer scan synchronous driver circuit through an FPC.

### Claim 4 (depends on 1)

The holographic LCD according to claim 1, wherein the layer-by-layer scan synchronous driver circuit comprises:
a signal synchronous receiver for receiving a synchronous signal, signal frequency of which is the refresh frequency at which the decomposed images obtained by decomposing the holographic stereo image are projected;
a timing controller which generates a control signal to control whether each panel of the multiple LCD panels is powered on or not, according to the refresh frequency, wherein the panel of the multiple LCD panels powered on is in the fully transmissive state, while the panel of the multiple LCD panels powered off is able to display the decomposed image projected;
a level shifter for controlling whether each of the multiple LCD panels is powered on or not according to the control signal.

### Claim 5 (depends on 4)

The holographic LCD according to claim 4, wherein the control signal includes:
a start layer signal which starts layer-by-layer scan at its rising edge;
a clock pulse layer signal which triggers the LCD panel to be powered off at its rising edge;
an output enable layer signal which allows the LCD panel to be powered off at low level; and
a layer ON signal which allows the LCD panel to be powered off at high level.

### Claim 6

A stereo display method for a holographic LCD, wherein the method comprises:
the holographic LCD receiving a synchronous signal from a signal synchronous generator, a signal frequency of the synchronous signal being a refresh frequency of projecting decomposed images obtained by decomposing the holographic stereo image;
a holographic projection device decomposing the holographic stereo image stored to obtain the decomposed images and projecting the decomposed images onto the holographic LCD sequentially;
the holographic LCD controlling a multiple LCD panels to display sequentially the decomposed images projected, according to the refresh frequency.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the synchronous signal carries an identifier information that indicates finish of projecting all the decomposed images obtained by decomposing the holographic stereo image, or an identifier information that indicates start of projecting the decomposed images obtained by decomposing the holographic stereo image;
the holographic LCD controlling the multiple LCD panels to display sequentially the decomposed images projected according to the refresh frequency comprising:
upon receiving any of the identifier information, the holographic LCD determining the corresponding number of the LCD panels based on the number of the decomposed images needing to be displayed subsequently and belonging to the same holographic stereo image and controlling the determined LCD panel to display in sequence the decomposed images projected, according to the refresh frequency.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the holographic LCD controlling the determined LCD panel to display in sequence the decomposed images projected comprises:
the holographic LCD controlling one of the LCD panels to display the decomposed image projected by the holographic projection device while controlling others of the LCD panels of the holographic LCD to be in a fully transmissive state; the holographic projection device refreshes the decomposed images projected according to the refresh frequency, and the holographic LCD controlling the LCD panel which is currently displaying the decomposed image to enter the full transmissive state and controlling a layer of the LCD panel behind the LCD panel which is currently displaying the decomposed image to display the decomposed image refreshed.

### Claim 9 (depends on 6)

The method according to claim 6, wherein the refresh frequency is no less than 46 Hz.

### Claim 10

A stereo display system for a holographic LCD, wherein the system comprises:
a holographic projection device which stores the decomposed images obtained by decomposing a holographic stereo image, and projects sequentially the decomposed images;
a signal synchronous generator which sends a synchronous signal, a signal frequency of which being the refresh frequency at which the holographic projection device projects the decomposed images;
a holographic LCD device having multiple LCD panels, for controlling the multiple LCD panels to display in sequence the decomposed images projected, and in a refresh period, controlling only one panel of the multiple LCD panels to display the decomposed image projected and other panels of the multiple LCD panels to enter a fully transmissive state, according to the refresh frequency of the synchronous signal received; the number of the multiple LCD panels of the holographic LCD no less than the number of the decomposed images obtained by decomposing a holographic stereo image.

### Claim 11 (depends on 10)

The stereo display system for a holographic LCD according to claim 10, wherein the synchronous signal carries an identifier information that indicates finish of projection of all the decomposed images obtained by decomposing the holographic stereo image, or an identifier information that indicates start of projection of the decomposed images obtained by decomposing the holographic stereo image;
upon receiving any of the identifier information, based on the number of the decomposed images belonging to the same holographic stereo image that needs to be displayed subsequently, the holographic LCD determines same number of the LCD panels and controls the determined LCD panels to display the decomposed images to be projected next.