DISPLAY APPARATUS WITH OPTICAL INPUT FUNCTION

• US 20080252617A1
• Filed: 10/05/2007
• Published: 10/16/2008
• Est. Priority Date: 11/06/2006
• Status: Active Grant

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Toshiba Matsushita Display Technology Co Ltd (Japan Display Incorporated)
• Inventors: Nakamura, Hiroki, Nakamura, Takashi, Hayashi, Hirotaka, Tada, Norio, Imai, Takayuki
• Granted Patent: US 7,924,273 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

In making a contact determination between an object and a display screen, a display apparatus of the present invention is capable of adjusting a region on which to make a contact determination in response to the displayed image in a liquid crystal panel, so that the influence by the displayed image can be suppressed. Moreover, for simplifying the contact determination process, the display apparatus sets solid a region in the picked-up image that is not a target of the contact determination, with a predetermined gradation value.

Claims

1. A display apparatus comprising:

a display unit configured to display an image having a part that an object is supposed to contact;

a plurality of optical input units disposed in the display unit and configured to output electric signals in a magnitude corresponding to an amount of received light;

a convert unit configured to receive the signals from each optical input unit and convert the signals into gradation values to obtain a picked-up image;

a designation unit configured to designate an area in the picked-up image corresponding to the part; and

a process unit configured to find a coordinate of the object in accordance with data within the designated area of the picked-up image.

2. The display apparatus according to claim 1, further comprising:

a replacement unit configured to replace a region other than the designated area in the picked-up image, with a predetermined gradation value.

3. The display apparatus according to claim 2, wherein the gradation value is a median value of the gradation in the picked-up image.

4. A display apparatus comprising:

a display unit configured to display an image having a part that an object is supposed to contact;

a plurality of optical input units disposed in the display unit and configured to output electric signals in a magnitude corresponding to an amount of received light;

a convert unit configured to receive the signals from each optical input unit and convert the signals into gradation values to obtain a picked-up image;

a process unit configured to find a coordinate of the object in accordance with the picked-up image; and

a measurement unit configured to detect the intensity of ambient light.

5. The display apparatus according to claim 4, further comprising:

a backlight configured to emit light to the display unit; and

a control unit configured to control the intensity of the backlight depending on the intensity of ambient light, detected by the measurement unit.

6. The display apparatus according to claim 4, wherein a protective screen is adhered to the display screen by a member having the same refractive index as the protective screen.

7. The display apparatus according to claim 6, further comprising an anti-reflection layer in a surface other than the surface adhered to the display screen, of the protective screen.