Image display apparatus with image entry function

• US 8,487,911 B2
• Filed: 12/18/2007
• Issued: 07/16/2013
• Est. Priority Date: 02/20/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Kinoshita, Masayoshi, Kageyama, Hiroshi
• Primary Examiner(s): Lefkowitz, Sumati
• Assistant Examiner(s): HERNANDEZ, JESUS J
• Application Number:
  US12/000,839
• Publication Number:
  US 20080198143A1
• Time in Patent Office: 2,037 Days
• Field of Search: None
• 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

An image display apparatus with image entry function capable of high-speed and high-accuracy direct screen entry without increasing the peripheral circuit scale or the number of circuit elements for each pixel that lower the pixel aperture ratio. A first pixel circuit and a second pixel circuit are alternately arrayed horizontally. First and second data lines are connected to a data driver and a sensor signal processor circuit. Selector switches are connected to the input terminal of the data driver. Gray scale voltages are sent from the data driver to the first and second data lines, and first and second photo sensor signals are sent to the sensor signal processor circuit.

Claims

1. An image display apparatus with image entry function comprising:

a plurality of pixel circuits disposed in a display region, each of said plurality of pixel circuits comprising a first pixel and a second pixel, each said first pixel containing a first photo sensor for receiving light irradiated from the observation side of the screen, and each said second pixel containing a second photo sensor continuously shielded from external light;

a gate line extending in a first direction and connecting alternately to some of the first pixels and some of the second pixels;

a plurality of first data lines extending in a second direction intersecting the first direction, each of the plurality of first data lines connects to some of the first pixels and disconnects to the second pixels;

a plurality of second data lines extending in the second direction, each of the plurality of second data lines connects to some of the second pixels and disconnects to the first pixels, the plurality of the first data lines and the plurality of the second data lines are disposed alternately in the first direction;

a sensor read line extending in the first direction and connecting alternately to some of the first pixels and some of the second pixels in a display region;

a gate driver for applying a pixel select signal to the gate line;

a data driver for supplying display data by way of the data line to the pixel selected by the pixel select signal;

a sensor driver connected to the sensor read line;

a first sensor signal processor circuit connecting to the plurality of first data lines and the plurality of second data lines;

a plurality of first signal lines extending in the first direction, each of the plurality of first signal lines connecting to some of the first pixels and disconnecting to the second pixel;

a plurality of second signal lines extending in the first direction, each of the plurality of second signal lines connecting to some of the second pixels and disconnecting to the first pixel; and

a second sensor signal processor circuit connecting to the plurality of first signal lines and the plurality of second signal lines,

wherein the first sensor signal processor circuit senses the secondary coordinates where the screen was touched based on the first photo sensor signal and the second photo sensor signal input by way of the plurality of the first data lines and the plurality of the second data lines.

2. The image display apparatus with image entry function according to claim 1,

wherein the first sensor signal processor circuit includes a differential amplifier circuit, and generates secondary coordinates by utilizing a signal from one of the plurality of second data lines as a reference signal and a signal from the first data line disposed adjacent to the one of the plurality of second data lines.

3. The image display apparatus with image entry function according to claim 1, further comprising a selector switch for switching to a display period or a blanking period among the plurality of first data lines and the plurality of second data lines and the data driver.

4. The image display apparatus with image entry function according to claim 3,

wherein signals from the first photo sensors and the second photo sensors are input to the first sensor signal processor circuit for generating the secondary coordinates in the blanking period that the selector switch selected.

5. The image display apparatus with image entry function according to claim 1, wherein the pixels are liquid crystal display pixels.

6. The image display apparatus with image entry function according to claim 1, wherein the pixels are electroluminescent display pixels.

7. The image display apparatus with image entry function according to claim 6, wherein the pixels are organic electroluminescent light emitting diodes.

8. The image display apparatus with image entry function according to claim 1,

wherein the first photo sensor and the second photo sensor are made from PIN diodes, and

wherein the PIN (positive negative intrinsic) diodes include drain and source electrodes.

9. The image display apparatus with image entry function according to claim 8, wherein a capacitor is connected in parallel with the drain and source terminals of the PIN diode.

10. The image display apparatus with image entry function according to claim 1,

wherein the first photo sensor and the second photo sensor are made from thin film transistors, and

wherein the thin film transistors include drain and gate and source terminals.

11. The image display apparatus with image entry function according to claim 10, wherein the gate and source electrodes of the thin film transistor are shorted together.

12. The image display apparatus with image entry function according to claim 10, wherein a capacitor is connected in parallel with the drain and source electrodes of the thin film transistor.

13. The image display apparatus with image entry function according to claim 2, wherein the sensor signal processor circuit generates the secondary coordinates by amplifying the differential between signal voltage of the one of the plurality of second data lines and signal voltage of the first data line disposed adjacent to the one of the plurality of second data lines using the differential amplifier circuit.

14. An image display apparatus with image entry function comprising:

a plurality of pixel circuits disposed in a display region, each of said plurality of pixel circuits comprising a first pixel and a second pixel, each said first pixel containing a first photo sensor for receiving light irradiated from the observation side of the screen, and each said second pixel containing a second photo sensor continuously shielded from external light;

a gate line extending in a first direction and connecting alternately to some of the first pixels and some of the second pixels;

a plurality of first data lines extending in a second direction intersecting the first direction, each of the plurality of first data lines connects to some of the first pixels and disconnects to the second pixels;

a plurality of second data lines extending in the second direction, each of the plurality of second data lines connects to some of the second pixels and disconnects to the first pixels;

the plurality of the first data lines and the plurality of the second data lines are disposed alternately in the first direction;

a sensor read line extending in the first direction and connecting alternately to some of the first pixels and some of the second pixels in a display region;

a gate driver for applying a pixel select signal to the gate line;

a data driver for supplying display data by way of the data line to the pixel selected by the pixel select signal;

a sensor driver connected to the sensor read line; and

a first sensor signal processor circuit connecting to the plurality of first data lines and the plurality of second data lines,

wherein the first sensor signal processor circuit senses the secondary coordinates where the screen was touched based on the first photo sensor signal and the second photo sensor signal input by way of the plurality of the first data lines and the plurality of the second data lines; and

wherein the plurality of first pixels and the plurality of second pixels comprise at least two first pixels and at least two second pixels, respectively, alternately spaced in the first direction.

15. The image display apparatus with image entry function according to claim 14,

wherein the first sensor signal processor circuit includes a differential amplifier circuit, and generates secondary coordinates by utilizing a signal from one of the plurality of second data lines as a reference signal and a signal from the first data line disposed adjacent to the one of the plurality of second data lines.

16. The image display apparatus with image entry function according to claim 14, further comprising a selector switch for switching to a display period or a blanking period among the plurality of first data lines and the plurality of second data lines and the data driver.

17. The image display apparatus with image entry function according to claim 16,

wherein signals from the first photo sensors and the second photo sensors are input to the first sensor signal processor circuit for generating the secondary coordinates in the blanking period that the selector switch selected.

18. The image display apparatus with image entry function according to claim 14, further comprising:

a plurality of first signal lines extending in the first direction, each of the plurality of first signal lines connecting to some of the first pixels and disconnecting to the second pixel;

a plurality of second signal lines extending in the first direction, each of the plurality of second signal lines connecting to some of the second pixels and disconnecting to the first pixel; and

a second sensor signal processor circuit connecting to the plurality of first signal lines and the plurality of second signal lines.

19. The image display apparatus with image entry function according to claim 14, wherein the pixels are liquid crystal display pixels.

20. The image display apparatus with image entry function according to claim 14, wherein the pixels are electroluminescent display pixels.

21. The image display apparatus with image entry function according to claim 20, wherein the pixels are organic electroluminescent light emitting diodes.

22. The image display apparatus with image entry function according to claim 14,

wherein the first photo sensor and the second photo sensor are made from PIN diodes, and

wherein the PIN (positive negative intrinsic) diodes include drain and source electrodes.

23. The image display apparatus with image entry function according to claim 22, wherein a capacitor is connected in parallel with the drain and source terminals of the PIN diode.

24. The image display apparatus with image entry function according to claim 14,

wherein the first photo sensor and the second photo sensor are made from thin film transistors, and

wherein the thin film transistors include drain and gate and source terminals.

25. The image display apparatus with image entry function according to claim 14, wherein the gate and source electrodes of the thin film transistor are shorted together.

26. The image display apparatus with image entry function according to claim 24, wherein a capacitor is connected in parallel with the drain and source electrodes of the thin film transistor.

27. The image display apparatus with image entry function according to claim 15, wherein the first sensor signal processor circuit generates the secondary coordinates by amplifying the differential between signal voltage of the one of the plurality of second data lines and signal voltage of the first data line disposed adjacent to the one of the plurality of second data lines using the differential amplifier circuit.