Display device and display device correction system

• US 6,535,207 B1
• Filed: 04/13/1999
• Issued: 03/18/2003
• Est. Priority Date: 04/16/1998
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Hiroki, Masaaki
• Primary Examiner(s): CHANG, KENT WU
• Application Number:
  US09/289,983
• Time in Patent Office: 1,435 Days
• Field of Search: 345/89, 345/204, 345/147, 345/150, 345/207, 345/87, 345/589, 345/690, 348/180, 348/181, 348/744, 348/189, 348/745
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: H04N 2005/745 Control circuits therefor
• CPC Class Codes: H04N 23/82 for controlling camera response irrespective of the scene brightness, e.g. gamma correction
• CPC Class Codes: H04N 5/202 Gamma control circuits for controlling camera response irrespective of the scene brightness H04N23/82
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 9/31 Projection devices for colour picture display , e.g. using electronic spatial light modulators [ESLM]
• CPC Class Codes: H04N 9/69 for modifying the colour signals by gamma correction controlling camera response for colour signals H04N23/83
• CPC Class Codes: H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control camera processing pipelines for colour balance H04N23/88

Abstract

To maintain for hours a display with high image quality and fine quality in a projector and a display system including the same. Using correction data obtained in accordance with the need of a user, correction processing is performed on an inputted video signal to input the corrected signal into a liquid crystal panel, thereby keeping good display characteristics.

Claims

1. A display device comprising:

a liquid crystal panel;

a screen;

a liquid crystal panel driver circuit; and

a memory,

wherein said display device displays video light obtained by irradiating with light said liquid crystal panel to which a video signal is inputted, and

wherein said display device further comprises;

an optical system provided between said liquid crystal panel and said screen;

a detection means for obtaining display screen data from the video light, said detection means provided between said liquid crystal panel and said optical system;

means for obtaining correction data on the basis of the display screen data;

means for storing the correction data in a memory;

means for correcting the video signal on the basis of the correction data stored in said memory; and

means for inputting the corrected image data to said liquid crystal panel driver circuit.

4. A display device according to claim 1 wherein the correction data is a digital signal.

7. A display device according to claim 1 wherein said memory is a gamma correction memory.

14. A device according to claim 1 wherein said detection means comprises at least one selected from the group consisting of a photo diode, a CCD and an image sensor.

19. A display device according to claim 1 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

2. A display device comprising:

a light source;

a liquid crystal panel; and

a screen,

wherein the display device projects with magnification onto said screen video light obtained by irradiating with light said liquid crystal panel to which a video signal is inputted, and

wherein said display device further comprises;

an optical system provided between said liquid crystal panel and said screen;

a detection means for obtaining display screen data from the video light, said detection means provided between said liquid crystal panel and said optical system;

an arithmetic means for obtaining correction data from the display screen data;

means for storing the correction data in a memory; and

means for correcting the video signal on the basis of the correction data stored in said memory.

5. A display device according to claim 2 wherein the correction data is a digital signal.

8. A display device according to claim 2 wherein said memory is a gamma correction memory.

15. A device according to claim 2 wherein said detection means comprises at least one selected from the group consisting of a photo diode, a CCD and an image sensor.

20. A display device according to claim 2 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

3. A display correction system comprising:

means for irradiating with light a display device to which a video signal is inputted, to thereby obtain video light;

a detection means for obtaining display screen data from the video light;

means for obtaining correction data on the basis of the display screen data;

means for storing the correction data in a memory;

means for correcting the video signal on the basis of the correction data to correct the video light; and

means for obtaining a display on a screen from the corrected video light,

wherein said display device comprises an optical system between said display device and said screen and,

wherein said detection means is provided between said display device and said optical system.

6. A display system according to claim 3 wherein the correction data is a digital signal.

9. A display system according to claim 3 wherein said memory is a gamma correction memory.

16. A device according to claim 3 wherein said detection means comprises at least one selected from the group consisting of a photo diode, a CCD and an image sensor.

21. A display device according to claim 3 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

10. A display device comprising:

a screen;

a liquid crystal panel for displaying a video light on said screen;

an optical system provided between said screen and said liquid crystal panel;

a sensor for obtaining display data from the video light, the sensor provided between the liquid crystal panel and the optical system to sense the video light between the liquid crystal panel and the optical system;

a digital multi meter for obtaining correction data on the basis of the display data;

a computer connected with the digital multi meter;

a memory connected with the computer for storing the correction data in the memory; and

a correction circuit for correcting a video signal on the basis of the correction data to correct the video light.

12. A device according to claim 10 wherein said sensor comprises at least one selected from the group consisting of a photo diode, a CCD and an image sensor.

22. A display device according to claim 10 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

26. A display device according to claim 10 wherein said memory is a gamma correction memory.

11. A display device comprising:

a screen;

a liquid crystal panel for displaying a video light on said screen;

an optical system provided between said screen and said liquid crystal panel;

a sensor for obtaining display data from the video light, the sensor provided between the liquid crystal panel and the optical system to sense the video light between the liquid crystal panel and the optical system;

a digital multi meter for obtaining correction data on the basis of the display data;

a CPU connected with the digital multi meter;

a memory connected with the CPU for storing the correction data in the memory; and

a correction circuit for correcting a video signal on the basis of the correction data to correct the video light.

13. A device according to claim 11 wherein said sensor comprises at least one selected from the group consisting of a photo diode, a CCD and an image sensor.

23. A display device according to claim 11 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

27. A display device according to claim 11 wherein said memory is a gamma correction memory.

17. A display device comprising:

a screen;

a liquid crystal panel for displaying a video light on said screen;

an optical system provided between said screen and said liquid crystal panel;

a sensor for obtaining display data from the video light, the sensor provided between the liquid crystal panel and the optical system to sense the video light between the liquid crystal panel and the optical system;

an A/D converter for obtaining correction data on the basis of the display data;

a computer connected with the A/D converter;

a memory connected with the computer for storing the correction data in the memory; and

a correction circuit for correcting a video signal on the basis of the correction data to correct the video light.

24. A display device according to claim 17 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

28. A display device according to claim 17 wherein said memory is a gamma correction memory.

18. A display device comprising:

a screen;

a liquid crystal panel for displaying a video light on said screen;

an optical system provided between said screen and said liquid crystal panel;

a sensor for obtaining display data from the video light, the sensor provided between the liquid crystal panel and the optical system to sense the video light between the liquid crystal panel and the optical system;

an A/D converter for obtaining correction data on the basis of the display data;

a CPU connected with the A/D converter;

a memory connected with the CPU for storing the correction data in the memory; and

a correction circuit for correcting a video signal on the basis of the correction data to correct the video light.

25. A display device according to claim 18 wherein said optical system comprises at least one selected from the group consisting of a lens, a mirror and a screen.

29. A display device according to claim 18 wherein said memory is a gamma correction memory.