# US 2013/0278595 A1 · Three-Dimensional Display Device and Display Control Method Thereof

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- Number: US 2013/0278595 A1
- Document ID: US20130278595A1
- Status: Published application
- Kind: A1
- Application number: 13/513,305
- Filed: 2012-04-26
- Published: 2013-10-24
- Earliest claimed: 2012-04-19
- Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Inventors: Chih-tsung Kang
- Web page: https://patentgrep.com/patent/US20130278595A1

## CPC

- H04N 13/30: Image reproducers (optical systems for producing stereoscopic or other three-dimensional [3D] effects G02B30/00)
- G09G 3/003: {to produce spatial visual effects}
- H04N 13/341: using temporal multiplexing
- H04N 13/398: Synchronisation thereof; Control thereof
- G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines}
- G09G 3/3611: {Control of matrices with row and column drivers}
- G09G 2320/0626: for control of overall brightness
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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)

## Abstract

The present invention provides a three-dimensional display device and display control method thereof, wherein controlling a plurality of backlight units to activate simultaneously when a lowermost display area receiving drive signal of an image frame and when the liquid crystal in the lowermost display area completely responded, and each of backlight units being closed when corresponding display area starting to receive another image frame; wherein drive current of the backlight unit corresponding to each display area being used to control the luminance of each display area. With this, the present invention can reduce the crosstalk caused by the three-dimensional display device, resulting in the reduction of residual image and improving the three-dimensional display effect and viewing experience.

## Claims

### Claim 1

A three-dimensional display device, which comprises:
a liquid crystal display panel, the liquid crystal display panel displaying left-eye image frame and right-eye image frame alternatingly, the liquid crystal display panel being divided into a plurality of display areas distributed continuously and sequentially, and driving being conducted in top-down scanning manner sequentially to drive the plurality of display areas;
a plurality of backlight units, each of backlight units corresponding to each of display areas, the plurality of backlight units activating simultaneously when the lowermost display area receiving drive signal of an image frame and when the liquid crystal in the lowermost display area completely responded, and each of backlight units being closed when corresponding display area starting to receive another image frame;
wherein drive current of the backlight unit corresponding to each display area being used to control luminance of each display area; the plurality of display areas being a first display area to Nth display area distributed on the liquid crystal panel from top-down continuously and sequentially; the plurality of backlight units being a first to Nth backlight units corresponding to N display areas respectively; luminance of N display areas being B1, B2, . . . , Bn, respectively; activation durations of the N backlight units being not the same, and being T1, T2, . . . , Tn, respectively, N being an integer equal to or greater than 2; the luminance of each of the N display areas and the activation duration of each of the N backlight units satisfying following equation:
B1*T1=B2*T2= . . . =Bn*Tn

### Claim 2

A three-dimensional display device, which comprises:
a liquid crystal display panel, the liquid crystal display panel displaying left-eye image frame and right-eye image frame alternatingly, the liquid crystal display panel being divided into a plurality of display areas distributed continuously and sequentially, and driving being conducted in top-down scanning manner sequentially to drive plurality of display areas;
a plurality of backlight units, each of backlight units corresponding to each of display areas, the plurality of backlight units activating simultaneously when the lowermost display area receiving drive signal of an image frame and when the liquid crystal in the lowermost display area completely responded, and each of backlight units being closed when corresponding display area starting to receive another image frame;
wherein drive current of the backlight unit corresponding to each display area being used to control luminance of each display area.

### Claim 3 (depends on 2)

The three-dimensional display device as claimed in claim 2, wherein the plurality of display areas are the first display area to Nth display area distributed on the liquid crystal panel from top-down continuously and sequentially; the plurality of backlight units are the first to Nth backlight units corresponding to N display areas respectively; the luminance of N display areas are B1, B2, . . . , Bn, respectively; activation durations of the N backlight units are not the same, and are T1, T2, . . . , Tn, respectively, where N is an integer equal to or greater than 2; the luminance of each of the N display areas and the activation duration of each of the N backlight units satisfy the following equation:
B1*T1=B2*T2= . . . =Bn*Tn, wherein T1<T2< . . . <Tn

### Claim 4 (depends on 3)

The three-dimensional display device as claimed in claim 3, wherein the drive current of each of N backlight units is I1, I2, . . . , In, respectively, and I1>I2> . . . >In.

### Claim 5 (depends on 4)

The three-dimensional display device as claimed in claim 4, wherein penetration ratio of current maximum signal of each of display area is Ts1, Ts2, . . . , Tsn, respectively; after compensating the penetration ratio of the current maximum signal of each of display area to Ts255 in the N display areas, where Ts255 is penetration ratio of grey-scale 255, the luminance of each of N display areas is B11, B21, . . . , Bn1, respectively; and the luminance of each of N display areas after adjustment satisfies the following equation:
T1*B1*Ts1=T1*B11*Ts255, T2*B2*Ts2=T2*B21*Ts255, . . . , Tn*Bn*Tsn=Tn*Bn1*Ts255, wherein Ts1<Ts255, Ts2<Ts255, . . . , Tsn<Ts255.

### Claim 6 (depends on 5)

The three-dimensional display device as claimed in claim 5, wherein after adjusting N display areas, the drive current of each of N display areas is I11, I21, . . . , In1, respectively, and I11<I1, I21<I2, . . . , In1<In.

### Claim 7

A display control method of three-dimensional display device, which comprises:
controlling a liquid crystal display panel to display left-eye image frame and right-eye image frame alternatingly, the liquid crystal display panel being divided into a plurality of display areas distributed continuously and sequentially, and driving being conducted in top-down scanning manner sequentially to drive plurality of display areas;
disposing a plurality of backlight units, each of backlight units corresponding to each of display areas, controlling the plurality of backlight units to activate simultaneously when lowermost display area receiving drive signal of an image frame and when the liquid crystal in the lowermost display area completely responded, and each of backlight units being closed when corresponding display area starting to receive another image frame;
wherein drive current of the backlight unit corresponding to each display area being used to control the luminance of each display area.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein the plurality of display areas are the first display area to Nth display area distributed on the liquid crystal panel from top-down continuously and sequentially; the plurality of backlight units are the first to Nth backlight units corresponding to N display areas respectively; the luminance of N display areas are B1, B2, . . . , Bn, respectively; activation durations of the N backlight units are not the same, and are T1, T2, . . . , Tn, respectively, where N is an integer equal to or greater than 2; the luminance of each of the N display areas and the activation duration of each of the N backlight units satisfy the following equation:
B1*T1=B2*T2= . . . =Bn*Tn, wherein T1<T2< . . . <Tn

### Claim 9 (depends on 8)

The method as claimed in claim 8, wherein the drive current of each of N backlight units is I1, I2, . . . , In, respectively, and I1>I2> . . . , >In.

### Claim 10 (depends on 9)

The method as claimed in claim 9, wherein penetration ratio of current maximum signal of each of display area is Ts1, Ts2, . . . , Tsn, respectively; after compensating the penetration ratio of the current maximum signal of each of display area to Ts255 in the N display areas, where Ts255 is penetration ratio of grey-scale 255, the luminance of each of N display areas is B11, B21, . . . , Bn1, respectively; and the luminance of each of N display areas after adjustment satisfies the following equation:
T1*B1*Ts1=T1B11*Ts255, T2*B2*Ts2=T2B21*Ts255, . . . , Tn*Bn*Tsn=Tn*Bn1*Ts255, wherein Ts1<Ts255, Ts2<Ts255, . . . , Tsn<Ts255.

### Claim 11 (depends on 10)

The method as claimed in claim 10, wherein after adjusting N display areas, the drive current of each of N display areas is I11, I21, . . . , In1, respectively, and I11<I1, I21<I2, . . . , In1<In.