Liquid-crystal display apparatus

1. A liquid-crystal display apparatus comprising:

a light source for generating visible-domain light and invisible-domain light;

a plurality of liquid-crystal devices laid out in a display face region of said liquid-crystal display apparatus for modulating visible-domain light generated by said light source on the basis of image data and transmitting invisible domain light generated by said light source, wherein each of the liquid-crystal devices comprises a pair of transparent substrates facing each other and color filters placed on one of the substrates that is disposed closer to the light source;

a plurality of light receiving devices laid out in said display face region as devices each used for receiving the visible-domain light and the invisible-domain light;

display driving means for driving said liquid-crystal devices on the basis of said image data so as to radiate visible-domain light from said display face as display light;

light-reception driving means for driving said light receiving devices to detect the visible-domain light and the invisible-domain light radiated from said display face and reflected by a detection-subject object reflecting said invisible-domain light generated by said light source and radiated from said display face, as detected light;

a received-light signal receiver for acquiring a received-light signal obtained from the light receiving devices for one horizontal line;

a received-light signal holding means for reconfiguring the received-light signal and storing the reconfigured received-light signal in a memory; and

a position detection means for carrying out signal processing for detecting position of said detection-subject object on the basis of the reconfigured received-light signal.

2. The liquid-crystal display apparatus according to claim 1 wherein at least one of the position and size of said detection-subject object is detected on the basis of said detected light.

3. The liquid-crystal display apparatus according to claim 1 wherein a plurality of detection-subject bodies are detected on the basis of said detected light.

4. The liquid-crystal display apparatus according to claim 1 wherein said light source comprises a first light sub-source for generating visible-domain light and a second light sub-source for generating invisible-domain light.

5. The liquid-crystal display apparatus according to claim 1 wherein each of said light receiving devices is made of single-crystal silicon, poly-crystal silicon, or amorphous silicon.

6. The liquid-crystal display apparatus according to claim 1 , wherein the color filters are placed between a transparent common electrode and one of the substrates that is disposed closer to the light source.

7. The liquid-crystal display apparatus according to claim 1 wherein:

said liquid-crystal devices and said light receiving devices are laid out on said display face to form a matrix;

said display driving means drives said liquid-crystal devices to emit light in line-sequential display operations; and

said light-reception driving means drives said light receiving devices to receive light in line-sequential light receiving operations.

8. The liquid-crystal display apparatus according to claim 7 wherein said light-reception driving means drives said light receiving devices to receive light in said line-sequential light receiving operations each synchronized with one of said line-sequential display operations.

9. The liquid-crystal display apparatus according to claim 1 wherein:

each of said liquid-crystal devices comprises a pair of transparent substrates facing each other and a liquid-crystal layer sandwiched between said transparent substrates;

said display driving means includes a switching device for driving each of said liquid-crystal devices; and

said light receiving devices and said switching devices are provided on the same transparent substrate.

10. The liquid-crystal display apparatus according to claim 9 wherein each of said liquid-crystal devices includes a color filter provided on at least one of said transparent substrates forming said pair.

11. The liquid-crystal display apparatus according to claim 1 wherein:

each of said light receiving devices is also capable of receiving visible-domain light; and

said light-reception driving means drives said light receiving devices to detect visible-domain light radiated from said display face and reflected by said detection-subject object reflecting said visible-domain light generated by said light source and radiated from said display face, as said detected light.

12. The liquid-crystal display apparatus according to claim 11 wherein:

each of said light receiving devices comprises a first light receiving sub-device for receiving visible-domain light and a second light receiving sub-device for receiving invisible-domain light; and

said light-reception driving means drives said first light receiving sub-devices and said second light receiving sub-devices so that said first light receiving sub-devices detect visible-domain light reflected by said detection-subject object, whereas said second light receiving sub-devices detect invisible-domain light, reflected by said detection-subject object.

13. The liquid-crystal display apparatus according to claim 12 wherein said light-reception driving means drives said first light receiving sub-devices and said second light receiving sub-devices by switching said light receiving devices from said first light receiving sub-devices to said second light receiving sub-devices and vice versa.

14. The liquid-crystal display apparatus according to claim 1 wherein said color filters are provided in areas associated with light emitting cells.

15. The liquid-crystal display apparatus according to claim 14 wherein the light emitting cells include a red-light emitting sub-cell, a green-light emitting sub-cell, and a blue-light emitting sub-cell.

16. The liquid-crystal display apparatus according to claim 15 wherein each of the red-light emitting sub-cell, the green-light emitting sub-cell, and the blue-light emitting sub-cell emits an invisible light.

17. The liquid-crystal display apparatus according to claim 16 wherein the invisible light has a constant luminance.

18. The liquid-crystal display apparatus according to claim 16 wherein the invisible light is emitted with the shape of a pulse waveform having a predetermined period to reduce a power consumption.

19. The liquid-crystal display apparatus according to claim 16 wherein the invisible light is a light in a domain of wavelengths greater than those of the domain of visible light.

20. The liquid-crystal display apparatus according to claim 16 wherein the invisible light is a light in a domain of wavelengths smaller than those of the domain of visible light.