Method of driving display device, display device and electronic apparatus

• US 6,496,174 B2
• Filed: 04/17/2001
• Issued: 12/17/2002
• Est. Priority Date: 12/14/1995
• Status: Expired due to Term

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kurumisawa, Takashi, Ito, Akihiko, Katase, Makoto, Isozaki, Shingo, Ikeda, Masuhide
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Said, Mansour M.
• Application Number:
  US09/836,842
• Publication Number:
  US 20020005843A1
• Time in Patent Office: 609 Days
• Field of Search: 345/87, 345/88, 345/90, 345/92, 345/93, 345/94, 345/95, 345/97, 345/98, 345/99, 345/100, 345/204, 345/205, 345/206, 345/210, 345/211, 345/214
• US Class Current: 345/98
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3622 using a passive matrix G09G3/3674 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3625 using active addressing
• CPC Class Codes: G09G 3/3692 suitable for passive matrices only

Abstract

A driving method of a display device in which the number of voltage levels of scanning lines during a non-selection period is only one, and the voltage level of a data line corresponding to a display element that present no image is set to the voltage level of the scanning lines during the non-selection period. The power consumption of the display device is thus reduced.

A minimum area of the entire screen of the device is used for image presentation while the remaining area is set to a display-off state (display-off mode) using the above driving method, and thus the power consumption of the display device, for example, in a standby state is reduced. Each of the display-enabled area and the display-off area is flexibly set.

A combination of a multi-line driving method and the above driving method helps further reduce power consumption.

Claims

1. A display device comprising:

a plurality of scanning lines including N scanning lines, the N scanning lines including K scanning lines, wherein both N and K are integers;

a data line intersecting the N scanning lines;

a controller transmitting a display control signal;

a driving circuit receiving the display control signal;

the driving circuit selecting each of the N scanning lines in sequence;

the driving circuit applying only one voltage level to one of the N scanning lines in response to the display control signal while the one of the N scanning lines is non-selected;

the driving circuit applying the only one voltage level to one of the K scanning lines in response to the display control signal while the one of the K scanning lines is selected;

the driving circuit applying selection voltage to one of the N scanning lines other than the K scanning lines in response to the display control signal while the one of the N scanning lines other than the K scanning lines is selected;

a level of the selection voltage that the driving circuit applies to the one of the N scanning lines other than the K scanning lines being lower than a level of the selection voltage that the driving circuit applies to each of the N scanning lines; and

a power source supplying voltage to the driving circuit, the power source changing a level of the voltage which is supplied to the driving circuit in accordance with the value of K.

2. The display device according to claim 1 wherein the power source includes a bootstrap circuit which generates different levels of voltage by changing at least either the quantity of charge stored in a capacitor or a level of the voltage of one polarity that is lower than a level of the voltage after a polarity reversion of the capacitor.

3. An electronic apparatus including the display device of claim 1.

4. A display device comprising:

a plurality of scanning lines including N scanning lines, the N scanning lines including K scanning lines, wherein both N and K are integers;

a data line intersecting the N scanning lines;

a controller transmitting a display control signal; and

a driving circuit receiving the display control signal;

the driving circuit simultaneously selecting h (h is an integer equal to or greater than

     2) of the N scanning lines in sequence;

the driving circuit applying only one voltage level to h of the N scanning lines in response to the display control signal while the h of the N scanning lines are non-selected;

the driving circuit applying only one voltage level to h of the K scanning lines in response to the display control signal while the h of the K scanning lines are selected;

the driving circuit applying selection voltage to h of the N scanning lines other than the K scanning lines in response to the display control signal while the h of the N scanning lines other than the K scanning lines are selected; and

a level of the selection voltage that the driving circuit applies to h of the N scanning lines other than the K scanning lines being lower than a level of selection voltage that the driving circuit applies to h of the N scanning lines.

5. An electronic apparatus including the display device of claim 4.

6. A display device comprising:

a plurality of scanning lines including N scanning lines, the N scanning lines including K scanning lines, wherein both N and K are integers;

a data line intersecting the N scanning lines;

a controller transmitting a display control signal;

a scanning line driving circuit receiving the display control signal;

the scanning line driving circuit selecting each of the N scanning lines in sequence;

the scanning line driving circuit applying only one voltage level to one of the N scanning lines in response to the display control signal while the one of the N scanning lines is non-selected;

the scanning line driving circuit applying the only one voltage level to one of the K scanning lines in response to the display control signal while the one of the K scanning lines is selected;

the scanning line driving circuit applying selection voltage to one of the N scanning lines other than the K scanning lines in response to the display control signal while the one of the N scanning lines other than the K scanning lines is selected; and

a data line driving circuit applying voltage to the data line;

the data line driving circuit applying voltage to the data line on the supposition that one of the K scanning lines receives selection voltage while the one of the K scanning lines is selected.

7. An electronic apparatus including the display device of claim 6.

8. A display device comprising:

a plurality of scanning lines including N scanning lines, the N scanning lines including K scanning lines, wherein both N and K are integers;

a data line intersecting the N scanning lines;

a controller transmitting a display control signal;

a scanning line driving circuit receiving the display control signal;

the scanning line driving circuit simultaneously selecting h (h is an integer equal to or greater than

     2) of the N scanning lines in sequence;

the scanning line driving circuit applying only one voltage level to h of the N scanning lines in response to the display control signal while the h of the N scanning lines are non-selected;

the scanning line driving circuit applying only one voltage level to h of the K scanning lines in response to the display control signal while the h of the K scanning lines are selected;

the scanning line driving circuit applying selection voltage to h of the N scanning lines other than the K scanning lines in response to the display control signal while the h of the N scanning lines other than the K scanning lines are selected; and

a data line driving circuit applying voltage to the data line; and

the data line driving circuit applying voltage to the data line on the supposition that h of the K scanning lines receive selection voltage while the h of the K scanning lines are selected.

9. An electronic apparatus including the display device of claim 8.

10. A display device comprising:

a plurality of scanning lines including N scanning lines, the N scanning lines including K scanning lines, wherein both N and K are integers;

a driving circuit providing voltages to the scanning lines, wherein a control signal is transmitted thereto; and

the driving circuit driving one of the N scanning lines and (N−

K) scanning lines, based on the control signal, as a subject of display, each of the driven scanning lines being selected to be driven;

the driving circuit not driving the K scanning lines;

wherein a voltage level applied to the selected scanning line in the event that the (N−

K) scanning lines are driven, is set to be lower than a voltage level applied to the selected scanning line in the event that the N scanning lines are driven.

11. The display device according to claim 10 further comprising a voltage source that supplies a voltage to the selected scanning lines, wherein the voltage is variable to change in accordance with the control signal.

12. The display device according to claim 11, wherein the voltage source comprises a bootstrap circuit that generates a plurality of voltages of different levels.

13. The display device according to claim 12, wherein the bootstrap circuit comprises a capacitor, and wherein the bootstrap circuit changes one of quantity of charge stored in the capacitor and voltage of one polarity that is lower in voltage level after a polarity that is lower in voltage level after a polarity inversion of the capacitor, whereby the bootstrap generates a plurality of voltages of different levels.

14. The display device according to claim 10, wherein the driving circuit selects each of a plurality of the driven scanning lines successively.

15. The display device according to claim 10, wherein the driving circuit selects some of the driven scanning lines simultaneously.

16. The display device according to claim 15, wherein the driving circuit applies a scanning voltage that is defined by a predetermined voltage pattern.

17. A display device comprising:

a plurality of scanning lines including N scanning lines, the N scanning lines including K scanning lines, wherein both N and K are integers;

a data line crossing the N scanning lines;

a first driving circuit providing voltages to the scanning lines, wherein a control signal is transmitted thereto;

a display area driven by the N scanning lines, the display area including;

a first display area driven by the K scanning lines; and

a second display area driven by some of the N scanning lines other than the K scanning lines; and

the driving circuit driving one of the N scanning lines and (N−

K) scanning lines, based on the control signal, as a subject of display, each of the driven scanning lines being selected to be driven;

wherein a voltage level applied to the selected scanning line in the event that the (N−

K) scanning lines are driven, is set to be lower than a voltage level applied to the selected scanning line in the event that the N scanning lines are driven.