Display device

• US 20020003520A1
• Filed: 07/10/2001
• Published: 01/10/2002
• Est. Priority Date: 07/10/2000
• Status: Active Grant

• Current Assignee: Gold Charm Limited (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Aoki, Makoto
• Granted Patent: US 7,002,540 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display device comprises a frame buffer which time-divides a frame displaying one picture into multiple sub-frames, an attenuation signal generating circuit which generates an attenuation signal by dividing the inputted luminosity signal by the designated attenuation coefficient, and a signal switching circuit which inputs luminosity signals before division to the antecedent sub-frame in the relevant frame, at the same time, inputs the above-mentioned attenuation signals after division to the subsequent sub-frame. Consequently, such a hold type display device is realized as is able to control the lowering of the picture brightness, as well as, prevent a moving picture from being unclear, blurred or disordered.

Claims

1. A display device being a hold type display device which holds a brightness of the antecedent picture until the subsequent signal is inputted to a pixel, wherein:

a frame displaying one picture is time-divided into multiple sub-frames; and

a brightness of the subsequent sub-frame is attenuated at a designated ratio according to the brightness of inputted picture.

2. A display device comprising:

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient; and

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame.

10. A display device as claimed in claim 2 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

3. A display device being a hold type display device which holds a brightness of the antecedent picture until the subsequent signal is inputted to a pixel, wherein:

a frame displaying one picture is time-divided into multiple sub-frames; and

the brightness of the subsequent sub-frame is attenuated at a designated ratio according to the brightness of inputted picture, comprising;

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient; and

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame.

11. A display device as claimed in claim 3 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

4. A display device comprising:

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient; and

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame, wherein;

the attenuation signal generating means generates a signal by shifting the series of a digitalized luminosity signal in the direction of the low order digit and eliminating the digits which are underflowed due to the shift, and outputs the generated signal as the attenuation signal.

12. A display device as claimed in claim 4 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

5. A display device being a hold type display device which holds the brightness of the antecedent picture until the subsequent signal is inputted to a pixel, comprising:

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient; and

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame, wherein;

a frame displaying one picture is time-divided into multiple sub-frames;

the brightness of the subsequent sub-frame is attenuated at a designated ratio according to the brightness of inputted picture; and

the attenuation signal generating means generates a signal by shifting the series of a digitalized luminosity signal in the direction of the low order digit and eliminating the digits which are underflowed due to the shift, and outputs the generated signal as the attenuation signal.

13. A display device as claimed in claim 5 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

6. A display device comprising:

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient;

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame;

an integration means for integrating the luminosity signals of entire pixels which form a picture in the relevant frame; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the obtained integrated value.

14. A display device as claimed in claim 6 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

7. A display device being a hold type display device which holds the brightness of the antecedent picture until the subsequent signal is inputted to a pixel, wherein:

a frame displaying one picture is time-divided into multiple sub-frames, and

the brightness of the subsequent sub-frame is attenuated at a designated ratio according to the brightness of inputted picture, comprising;

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient;

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame;

an integration means for integrating the luminosity signals of entire pixels which form a picture in the relevant frame; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the obtained integrated value.

15. A display device as claimed in claim 7 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

8. A display device comprising:

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient;

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame;

an integration means for integrating the luminosity signals of entire pixels which form a picture in the relevant frame; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the obtained integrated value, wherein;

the attenuation signal generating means generates a signal by shifting the series of a digitalized luminosity signal in the direction of the low order digit and eliminating the digits which are underflowed due to the shift, and outputs the generated signal as the attenuation signal.

16. A display device as claimed in claim 8 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.

9. A display device being a hold type display device which holds the brightness of the antecedent picture until the subsequent signal is inputted to a pixel, comprising:

a sub-frame generating means which time-divides a frame displaying one picture into multiple sub-frames;

an attenuation signal generating means for generating an attenuation signal by dividing an inputted luminosity signal by a designated attenuation coefficient;

a signal switching means for inputting the luminosity signal before division to the antecedent sub-frame in the relevant frame, and inputting the attenuation signal after division to the subsequent sub-frame in the relevant frame;

an integration means for integrating the luminosity signals of entire pixels which form a picture in the relevant frame; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the obtained integrated value, wherein;

a frame displaying one picture is time-divided into multiple sub-frames;

the brightness of the subsequent sub-frame is attenuated at a designated ratio according to the brightness of inputted picture; and

the attenuation signal generating means generates a signal by shifting the series of a digitalized luminosity signal in the direction of the low order digit and eliminating the digits which are underflowed due to the shift, and outputs the generated signal as the attenuation signal.

17. A display device as claimed in claim 9 comprising:

a luminosity classifying means for segmenting the inputted luminosity signals according to the luminosity level; and

an attenuation coefficient generating means for generating an attenuation coefficient which is varied according to the segmented brightness range.