Claims
- 1. A display driving method which drives a display to make a gradation display on a screen of the display depending on a length of a light emission time in each of sub fields forming one field, where one field is a time in which an image is displayed, N sub fields SF1 through SFN form one field, and each sub field includes a sustain time which determines a luminance level, said display driving method comprising the steps of:increasing a luminance quantity when displaying a luminance level m by adding one sub field which is to assume a light emission state in addition to all sub fields which assume the light emission state when displaying a luminance level m−1, where m is an integer satisfying 0<m≦N.
- 2. The display driving method as claimed in claim 1, further comprising the steps of:controlling lengths of light emission times so as to satisfy a relationship T(SF1)≦T(SF2)≦ . . . ≦T(SFm)≦T(SFm+1)≦ . . . ≦T(SFN−1)≦T(SFN) when a sub field which does not assume a light emission state for the luminance level m−1 but first assumes the light emission state for the luminance level m is denoted by SFm, a sub field which does not assume the light emission state for the luminance level m but first assumes the light emission state for the luminance level m+1 is denoted by SFm+1, the length of the light emission time of the sub field SFm is denoted by T(SFm), and the length of the light emission time of the sub field SFm+1 is denoted by T(SFm+1).
- 3. The display driving method as claimed in claim 2, further comprising the steps of:carrying out a distortion correction process with respect to the input image data using an inverse function.
- 4. The display driving method as claimed in claim 1, further comprising the steps of:carrying out a multi-level gradation process with respect to the input image data.
- 5. The display driving method as claimed in claim 1, further comprising the steps of:allocating a first number of sub fields for displaying gradation steps of a low luminance portion and allocating a second number of sub fields for displaying gradation steps of a high luminance portion, where said first number is greater than the second number.
- 6. The display driving method as claimed in claim 5, further comprising the steps of:setting a number of sustain pulses so that a number of sustain pulses in each sub field allocated for displaying the gradation steps of the low luminance portion is smaller than a number of sustain pulses in each sub field allocated for displaying the gradation steps of the high luminance portion.
- 7. A display driving apparatus which drives a display to make a gradation display on a screen of the display depending on a length of a light emission time in each of sub fields forming one field, where one field is a time in which an image is displayed, N sub fields SF1 through SFN form one field, and each sub field includes a sustain time which determines a luminance level, said display driving apparatus comprising:a control circuit which controls the display so as to increase a luminance quantity when displaying a luminance level m by adding one sub field which is to assume a light emission state in addition to all sub fields which assume the light emission state when displaying a luminance level m−1, where m is an integer satisfying 0<m≦N.
- 8. The display driving apparatus as claimed in claim 7, further comprising:means for controlling lengths of light emission times so as to satisfy a relationship T(SF1)≦T(SF2)≦ . . . ≦T(SFm)≦T(SFm+1)≦ . . . ≦T(SFN−1)≦T(SFN) when a sub field which does not assume a light emission state for the luminance level m−1 but first assumes the light emission state for the luminance level m is denoted by SFm, a sub field which does not assume the light emission state for the luminance level m but first assumes the light emission state for the luminance level m+1 is denoted by SFm+1, the length of the light emission time of the sub field SFm is denoted by T(SFm), and the length of the light emission time of the sub field SFm+1 is denoted by T(SFm+1).
- 9. The display driving apparatus as claimed in claim 8, further comprising:means for carrying out a distortion correction process with respect to the input image data using an inverse function.
- 10. The display driving apparatus as claimed in claim 7, further comprising:means for carrying out a multi-level gradation process with respect to the input image data.
- 11. The display driving apparatus as claimed in claim 7, further comprising:means for allocating a first number of sub fields for displaying gradation steps of a low luminance portion and allocating a second number of sub fields for displaying gradation steps of a high luminance portion, where said first number is greater than the second number.
- 12. The display driving apparatus as claimed in claim 11, further comprising:means for setting a number of sustain pulses so that a number of sustain pulses in each sub field allocated for displaying the gradation steps of the low luminance portion is smaller than a number of sustain pulses in each sub field allocated for displaying the gradation steps of the high luminance portion.
- 13. A display driving method which drives a plasma display panel in response to an input image data to make a gradation display thereon by selecting one or more sustain times, in which a light emission is made, form N sustain times, where one field in which an image is displayed is formed by N sub fields SF1 through SFN, and each sub field includes a sustain time, said display driving method comprising:obtaining N+1 gradation levels 0 through N by selecting one or more sustain times in which the light emission is made from the N sustain times when making the gradation display; and displaying an arbitrary gradation level m by newly selecting a different sustain time in which the light emission is made, in addition to selected one or more sustain times in which the light emission is made when displaying a gradation level m−1, where m is a positive integer satisfying 0<m≦N.
- 14. The display driving method as claimed in claim 13, further comprising:carrying out an error diffusion process with respect to the input image data to make pseudo multi-level gradation display.
- 15. A displaying driving method which drives a plasma display panel to make a gradation display thereon by forming one field in which an image is displayed from N sub fields SF1 through SFN, comprising:selecting a first subfield SF1, which corresponds to a gradation level 1 and is first in time, and successively selecting, additionally, a next sub field which is adjacent in time depending on an increase of the gradation level; and displaying N+1 gradation levels 0 through N by the N subfields, so as to display one image for displaying a moving image.
- 16. A display driving method which drives a plasma display panel to make a gradation display thereon by selecting one or more sustain times in which a light emission is made from N sustain times, where one field in which an image is displayed is formed by N subfields SF1 through SFN from one field, and each subfield includes a sustain time, said display driving method comprising:displaying an arbitrary gradation level m by selecting a sustain time in which the light emission is made in a sub field SFm, in addition to selected one or more sustain times in which the light emission is made when displaying a gradation level m−1, where m is a positive integer satisfying 0<m≦N.
Priority Claims (3)
Number |
Date |
Country |
Kind |
7-275911 |
Oct 1995 |
JP |
|
8-122075 |
May 1996 |
JP |
|
8-263398 |
Oct 1996 |
JP |
|
Parent Case Info
This application is a continuation of U.S. Ser. No. 09/478,489 filed Jan. 6, 2000, now allowed, which is a divisional of U.S. application Ser. No. 08/735,750, filed on Oct. 23, 1996, now U.S. Pat. No. 6,144,364 issued Nov. 7, 2000.
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Continuations (1)
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Number |
Date |
Country |
Parent |
09/478489 |
Jan 2000 |
US |
Child |
10/095580 |
|
US |