IMAGE DISPLAY DEVICE AND METHOD OF DRIVING THE SAME

• US 20100097449A1
• Filed: 06/04/2009
• Published: 04/22/2010
• Est. Priority Date: 10/17/2008
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kang, Hoon, Baik, Insu, JEONG, Woonam
• Granted Patent: US 8,294,753 B2
• Time in Patent Office: Days
• US Class Current: 348/59
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H04N 13/305 using lenticular lenses, e.g. arrangements of cylindrical lenses
• CPC Class Codes: H04N 13/32 using arrays of controllable light sources; using moving apertures or moving light sources
• CPC Class Codes: H04N 13/359 Switching between monoscopic and stereoscopic modes

Abstract

An image display device and a method of driving the same are provided. The image display device includes a lenticular lens array, a first backlit display element that is positioned on the lenticular lens array and is driven at a frame frequency of N×60 Hz, where N is an integer equal to or greater than 1, and a light source module under the lenticular lens array. The first backlit display element displays a video signal of a 2D format in a 2D mode and displays a video signal of an N-view 3D format in a 3D mode. The light source module irradiates light in the form of a surface light source onto the lenticular lens array in the 2D mode and irradiates light in the form of a plurality of line light sources onto the lenticular lens array in the 3D mode.

Claims

1. An image display device comprising:

a lenticular lens array;

a first backlit display element that is positioned on the lenticular lens array and is driven at a frame frequency of N×

60 Hz, where N is an integer equal to or greater than 1; and

a light source module that is positioned under the lenticular lens array and irradiates light onto the lenticular lens array using a plurality of electrically individually controllable pixels,

wherein the first backlit display element displays a video signal of a 2-dimensional (2D) format in a 2D mode and displays a video signal of an N-view 3-dimensional (3D) format in a 3D mode,

wherein the light source module irradiates light in the form of a surface light source onto the lenticular lens array in the 2D mode and irradiates light in the form of a plurality of line light sources, that are spaced apart from one another at a uniform distance, onto the lenticular lens array in the 3D mode.

2. The image display device of claim 1, wherein the light source module includes:

a backlight unit including a light source, the backlight unit generating light through the light source; and

a second backlit display element between the backlight unit and the lenticular lens array, the second backlit display element including a plurality of electrically individually controllable pixels.

3. The image display device of claim 2, wherein the second backlit display element synchronizes with the first backlit display element and is driven at a frame frequency of N×

60 Hz,

wherein the second backlit display element transmits light from the backlight unit without a conversion of the light in the 2D mode and partially shields light from the backlight unit in the 3D mode.

4. The image display device of claim 3, wherein the second backlit display element includes a thin film transistor (TFT) array between first and second transparent substrates, each of which is attached to a polarizing plate, and a liquid crystal layer that is individually turned on or off in each of the pixels by the TFT array,

wherein the second backlit display element does not include a color filter.

5. The image display device of claim 1, wherein the light source module includes a self-emitting element that is positioned under the lenticular lens array and includes a plurality of electrically individually controllable pixels.

6. The image display device of claim 5, wherein the self-emitting element synchronizes with the first backlit display element and is driven at a frame frequency of N×

60 Hz,

wherein the self-emitting element operates as a surface light source in the 2D mode and operates as a plurality of line light sources in the 3D mode.

7. The image display device of claim 6, wherein the self-emitting element includes a thin film transistor (TFT) array and a white organic light emitting diode (OLED) element that is individually turned on or off in each of the pixels by the TFT array,

wherein the self-emitting element does not include a color filter.

8. The image display device of claim 1, wherein 1 lens pitch of the lenticular lens array is substantially equal to 1 pixel of the light source module.

9. The image display device of claim 8, wherein the number of subpixels included in the 1 pixel of the light source module is N in the 3D mode when a frame frequency of each of the first backlit display element and the light source module is N×

60 Hz, wherein an angle between the subpixel of the light source module and the lenticular lens array is 0 to 15°

.

10. The image display device of claim 9, wherein when the first backlit display element is driven at the frame frequency of N×

60 Hz, the first backlit display element time-division displays an image of the N-view 3D format in the 3D mode during N sub-frame periods of 1 frame period corresponding to 1/60 sec.

11. The image display device of claim 10, wherein the light source module shifts the light in the form of the plurality of line light sources every the sub-frame period in the 1 frame period in the 3D mode.

12. A method of driving an image display device comprising:

positioning a first backlit display element on a lenticular lens array to drive the first backlit display element at a frame frequency of N×

60 Hz, where N is an integer equal to or greater than 1;

positioning a light source module including a plurality of electrically individually controllable pixels under the lenticular lens array to irradiate light onto the lenticular lens array;

controlling light from the light source module into light in the form of a surface light source in a 2-dimensional (2D) mode to display a video signal of a 2D format on the first backlit display element; and

controlling light from the light source module into light in the form of a plurality of line light sources, that are spaced apart from one another at a uniform distance, in a 3-dimensional (3D) mode to display a video signal of an N-view 3D format on the first backlit display element.

13. The method of claim 12, further comprising setting the number of subpixels included in 1 pixel of the light source module to N in the 3D mode when a frame frequency of each of the first backlit display element and the light source module is N×

60 Hz.

14. The method of claim 13, wherein displaying the video signal of the N-view 3D format includes:

time-division driving the first backlit display element so that the first backlit display element is driven at the frame frequency of N×

60 Hz, and an image of the N-view 3D format is time-division displayed during N sub-frame periods of 1 frame period corresponding to 1/60 sec in the 3D mode; and

time-division driving the light source module so that the light source module synchronizes with the first backlit display element to shift the light in the form of the plurality of line light sources during the 1 frame period.

15. The method of claim 14, wherein an angle between the subpixel of the light source module and the lenticular lens array is 0 to 15°

.