DISPLAY DEVICE

• US 20090161051A1
• Filed: 12/15/2008
• Published: 06/25/2009
• Est. Priority Date: 12/19/2007
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takama, Daisuke, Matsui, Yasuyuki, Fukunaga, Yoko
• Granted Patent: US 8,199,083 B2
• Time in Patent Office: Days
• US Class Current: 349/115
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A display device. The display device including a display surface, a plurality of pixel areas, a plurality of sensor areas, an optical filter portion, a light shielding portion, and an arithmetically operating portion.

Claims

1. A display device, comprising:

a display surface on which information is displayed;

a plurality of pixel areas including optical elements, respectively, each of said optical elements being adapted to generate a light having an intensity corresponding to data inputted and to output the light to said display surface;

a plurality of sensor areas each of which includes a pair of light receiving elements, each of said light receiving elements being adapted to receive an incident light and to subject the incident light to photoelectric conversion;

an optical filter portion disposed between a first light receiving element and said display surface within the corresponding one of said plurality of sensors, said optical filter portion being adapted to absorb and shield the incident light in a visible light band, and to transmit the incident light in a nonvisible light band;

a light shielding portion, having a light absorbing property, disposed between a second light receiving element disposed close to said first light receiving element, and said display surface within the corresponding one of said plurality of sensor areas, said light shielding portion being adapted to absorb and shield the incident light; and

an arithmetically operating portion for obtaining a difference between an output signal from said first light receiving element, and an output signal from said second light receiving element.

2. The display device according to claim 1, wherein

said optical filter portion is made of a first pigment dispersed resist obtained by dispersing an organic pigment for selectively absorbing a light in a specific wavelength band, and transmitting lights in other wavelength band into a resist;

and

said light shielding portion is made of a second pigment dispersed resist obtained by dispersing an organic or inorganic pigment having an absorbing property for an entire wavelength band of lights into a resist.

3. The display device according to claim 1, wherein said optical filter portion is made of a first pigment dispersed resist obtained by dispersing an organic pigment for selectively absorbing a light in a specific first wavelength band, and transmitting lights in other second wavelength band into a resist;

and

said light shielding portion including;

a layer made of the first pigment dispersed resist; and

a layer made of a third pigment dispersed resist obtained by dispersing an organic pigment for selectively absorbing the light in the second wavelength band, and transmitting the light in the first wavelength band, said layer being disposed on a side, of said layer made of the first pigment dispersed resist, opposite to said display surface.

4. The display device according to claim 1, wherein said optical filter portion is made of a first pigment dispersed resist obtained by dispersing an organic pigment for selectively absorbing a light in a specific first wavelength band, and transmitting lights in other second wavelength band into a resist;

and

said light shielding portion including;

a metallic film; and

an antireflection film formed at least on a surface of said metallic film opposite to said display surface.

5. The display device according to claim 4, wherein said antireflection film is one having a light absorbing property for attenuating an incident light.

6. A display device, comprising:

a display surface on which information is displayed;

a plurality of pixel areas including optical elements, respectively, each of said optical elements being adapted to generate a light having an intensity corresponding to data inputted and to output the light to said display surface;

a plurality of sensor areas each of which includes a pair of light receiving elements, each of said light receiving elements being adapted to receive an incident light and to subject the incident light to photoelectric conversion;

an optical filter portion disposed between a first light receiving element and said display surface within the corresponding one of said plurality of sensors, said optical filter portion being adapted to absorb and shield the incident light in a visible light band, and to transmit the incident light in a nonvisible light band;

a wavelength-selective mirror portion disposed between a second light receiving element disposed close to said first light receiving element, and said display surface within the corresponding one of said plurality of sensor areas, said wavelength-selective mirror portion being adapted to reflect a nonvisible light, in a specific wavelength band, made incident thereto from the display surface side, to transmit a light in a wavelength band other than the specific wavelength band, and to transmit a light made incident thereto from a side opposite to the display surface side; and

an arithmetically operating portion for obtaining a difference between an output signal from said first light receiving element, and an output signal from said second light receiving element.

7. The display device according to claim 6, wherein said wavelength-selective mirror portion includes a layer containing therein a cholesteric liquid crystal composition for selectively reflecting a nonvisible light, in a specific wavelength band, made incident thereto from the display surface side, and transmitting a nonvibible light in a wavelength band other than the specific wavelength band, and a visible light made incident thereto from the display surface side, and a light made incident thereto from a side opposite to the display surface side.