Sidelight illuminated flat panel display and touch panel input device

• US 20050200294A1
• Filed: 02/08/2005
• Published: 09/15/2005
• Est. Priority Date: 02/24/2004
• Status: Abandoned Application

• Current Assignee: Leadin Technology Co., Ltd.
• Original Assignee: Leadin Technology Co., Ltd.
• Inventors: Reddy, Damoder, Naugler, W. Edward Jr.
• Application Number:
  US11/054,708
• Publication Number:
  US 20050200294A1
• Time in Patent Office: Days
• US Class Current: 315/149
• CPC Class Codes: G06F 3/03542 Light pens for emitting or receiving light
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

System, device, and method for receiving or sensing touch or light input to an emissive display such as to a OLED display using the same or different sensors as are used to sense and maintain a pixel luminance. Penlight and touch screen data input system and method for display. A sidelight illuminated display and touch panel input device. Method and device for reading display pixel emission and ambient luminance levels. Emissive display having sensing for luminance stabilization and user light or touch screen input. Method and device for emissive display using shielded or partially shielded sensors. Emissive pixel display device characterized in that photon sensors are disposed within pixels and operated to sense photons emitted by emitter within pixel and ambient photons emitted by sources outside pixel, sensed internally emitted photons being for luminance feedback control and sensed ambient photons being used to detect external light source or sources.

Claims

1. A method for detecting an input to a display device having a first plurality of separately addressable picture element (pixel) locations arranged as a two-dimensional array, the method comprising:

providing a photon sensing element proximate at least some of the first plurality of separately addressable pixel locations in the two-dimensions of the array;

detecting photons impinging on each of the sensing elements during predetermined detection time periods;

generating a sensed signal for each of the photon sensing elements corresponding to the number or energy of the detected photons; and

analyzing the sensed signals to identify at least one pixel location that has received an input.

2. A method as in claim 1, wherein a first plurality of photon sensing elements are adapted to sense a background luminance magnitude not associated with an input from an external user and a larger different luminance magnitude that is associated with the input from the user.

3. A method as in claim 2, wherein the larger magnitude luminance is generated from a photon emitter located inside the display device that has a higher luminance than a diffuse background luminance incident on the surface of the display.

4. A method as in claim 3, wherein the photons emitted from the photon emitter located inside the display device are substantially completely contained within a first transmission medium so that they do not impinge upon the sensor elements but the photons are caused to exit the first transmission medium at a user input location.

5. A method as in claim 4, wherein the photons are substantially completely contained within a first transmission medium by total internal reflection within a plate disposed between the display emitters and the user and the photons are caused to exit the first transmission medium by altering a surface property or characteristic of the plate or by altering the plate surface interface from a second medium to a third medium.

6. A method as in claim 5, wherein the second medium comprises a gaseous medium and wherein the third medium comprises a non-gaseous medium.

7. A method as in claim 6, wherein the second medium is air.

8. A method as in claim 6, wherein the third medium comprises a substantially opaque solid stylus.

9. A method as in claim 5, wherein the photons caused to exit the first medium are scattered by an object external to the display so that at least a portion of the scattered photons are scattered or reflected back toward the display and impinge upon the sensor elements.

10. A method as in claim 1, wherein the photon sensing elements are adapted to sense the photon wavelengths (energies) and luminance magnitudes emitted by a stylus carried external photon emitter.

11. A method as in claim 1, wherein the photon sensing elements are adapted to sense a luminance magnitude received from the stylus carried external photon emitter that is higher than an ambient background luminance magnitude received by photon sensing elements not illuminated by the external photon emitter.

12. A method as in claim 1, wherein the stylus carried external photon emitter comprises a light pen.

13. A method as in claim 1, wherein the external photon emitter comprises a light emitting diode (LED).

14. A method as in claim 1, wherein the external photon emitter comprises an incandescent photon emitter.

15. A method as in claim 1, wherein a spectrally selective filter is disposed in the optical (light) path between a source of ambient light and a sensing element.

16. A method as in claim 15, wherein the spectrally selective filter is a filter that substantially transmits red light.

17. A method as in claim 15, wherein the ambient light is light (photons) from a red side light contained in a plate by total internal reflection and directed into the sensing elements by alteration of a surface interface.

18. A method as in claim 15, wherein the ambient light is light (photons) from a red laser light or a red light emitting diode directed into the sensing elements.

19. A method as in claim 15, wherein a spectrally selective filter is disposed in the optical (light) path between a source of ambient light and a sensing element;

a light input device emits at a wavelength within the pass band of the spectrally selective filter; and

the photon sensing elements comprise sensors that are read during the display vertical retrace time.

20. A method as in claim 1, wherein the photon sensing elements are adapted sense the photon wavelengths and energies and luminance magnitudes emitted by a stylus carried external photon emitter.

21. A method as in claim 1, wherein the photon sensing elements are adapted to sense a luminance magnitude received from the stylus carried external photon emitter that is higher than an ambient background luminance magnitude received by photon sensing elements not illuminated by the external photon emitter.

22. A method as in claim 21, wherein the stylus carried external photon emitter comprises a light pen.

23. A method as in claim 21, wherein the external photon emitter comprises a light emitting diode (LED).

24. A method as in claim 21, wherein the external photon emitter comprises an incandescent photon emitter.

25. A device for detecting an input to a display device having a first plurality of separately addressable picture element (pixel) locations arranged as a two-dimensional array, the device comprising:

a photon sensing element proximate at least some of the first plurality of separately addressable pixel locations in the two-dimensions of the array;

at least one detection circuit detecting photons impinging on each of the sensing elements during predetermined detection time periods;

at least one measurement circuit generating a sensed signal for each of the photon sensing elements corresponding to the number or energy of the detected photons; and

a comparison circuit for comparing and analyzing the sensed signals to identify at least one pixel location that may have received an input.

26. A device as in claim 25, wherein a first plurality of photon sensing elements are adapted to sense a background luminance magnitude not associated with an input from an external user and a larger different luminance magnitude that is associated with the input from the user.

27. A device as in claim 26, wherein the larger magnitude luminance is generated from a photon emitter located inside the display device that has a higher luminance than a diffuse background luminance incident on the surface of the display.

28. A device as in claim 27, wherein the photons emitted from the photon emitter located inside the display device are substantially completely contained within a first transmission medium so that they do not impinge upon the sensor elements but the photons are caused to exit the first transmission medium at a user input location.

29. A device as in claim 28, wherein the photons are substantially completely contained within a first transmission medium by total internal reflection within a plate disposed between the display emitters and the user and the photons are caused to exit the first transmission medium by altering a surface property or characteristic of the plate or by altering the plate surface interface from a second medium to a third medium.

30. A device as in claim 25, wherein the photon sensing elements are adapted to sense the photon wavelengths (energies) and luminance magnitudes emitted by a stylus carried external photon emitter.

31. A device as in claim 25, wherein a spectrally selective filter is disposed in the optical (light) path between a source of ambient light and a sensing element.

32. A device as in claim 25, wherein a spectrally selective filter is disposed in the optical (light) path between a source of ambient light and a sensing element;

a light input device emits at a wavelength within the pass band of the spectrally selective filter; and

the photon sensing elements comprise sensors that are read during the display vertical retrace time.

33. A device as in claim 25, wherein the photon sensing elements are adapted sense the photon wavelengths and energies and luminance magnitudes emitted by a stylus carried external photon emitter.

34. A method as in claim 25, wherein the photon sensing elements are adapted to sense a luminance magnitude received from the stylus carried external photon emitter that is higher than an ambient background luminance magnitude received by photon sensing elements not illuminated by the external photon emitter.