Claims
- 1. A panel display comprising:
- a display panel including a plurality of cells to be selectively discharged to glow
- an address driver for setting said plurality of cells to states represented by display data,
- a display glowing driver for enabling said plurality of cells to glow according to said set states,
- one frame during which one screen is displayed, said frame having a plurality of sub-frames and glowing periods within said sub-frames, during which said display cells are enabled to glow by said display glowing driver, said sub-frames being weighted in order to achieve gray-scale display
- a display load for each sub-frame calculating circuit for calculating a display load to be imposed on a whole display surface during each sub-frame; and
- a corrected period calculating circuit for calculating a corrected period of a glowing period, during which said display cells are enabled to glow by said display glowing driver, according to display load to be imposed during each sub-frame, which is calculated by said display load calculating circuit, so that brightness attained by said display cells during respective sub-frames will be maintained at a given ratio.
- 2. A panel display according to claim 1, wherein said corrected period calculating circuit calculates a corrected period of a glowing period within each sub-frame, during which said display cells are enabled to glow by said display glowing driver, so that a brightness to be attained will be matched with the one permitted by a display load having a maximum value within a variation range.
- 3. A panel display according to claim 1, wherein said corrected period calculating circuit calculates a corrected period of a glowing period, during which said display cells are enabled to glow by said display glowing driver, so that a brightness to be attained will be matched with the one attained with imposition of the same display load as the one to be imposed during a sub-frame to which the largest display load is allotted.
- 4. A panel display according to claim 1, wherein said corrected period calculating circuit calculates a weighted mean of display loads to be imposed during sub-frames in consideration of said weighting, and calculates a corrected period of a glowing period, during which said display cells are enabled to glow by said display glowing driver, so that a brightness to be attained will be matched with the one attained with imposition of a display load of said weighted mean.
- 5. A panel display according to claim 4, wherein: said corrected period calculating circuit includes a judging circuit for judging if a total sum of calculated corrected periods of glowing periods, during which said display cells are enabled to glow by said display glowing driver, exceeds a given length; and when said total sum exceeds said given length, correction is made so that said total sum will equal to said given length.
- 6. A panel display according to claim 1, wherein said corrected period calculating circuit calculates a median of display loads to be imposed during sub-frames, and calculates a corrected period of a glowing period, during which said display cells are enabled to glow by said display glowing driver, so that a brightness to be attained will be matched with the one attained with imposition of a display load of said median.
- 7. A panel display according to claim 1, wherein: said display load calculating circuit calculates display loads to be imposed during sub-frames associated with large weights and represented by high-order bits; and said corrected period calculating circuit calculates a corrected period on the assumption that a given display load is imposed during any sub-frame other than said sub-frames associated with large weights and represented by high-order bits.
- 8. A driving method for a display panel having a plurality of cells to be selectively discharged to glow, and a frame during which one screen is displayed and is composed of a plurality of sub-frames, each sub-frame including an addressing period during which said plurality of cells are set to states represented by display data, and a display glowing period during which said plurality of cells are enabled to glow according to said set states, said display glowing periods each being weighted in order to achieve gray-scale display, said driving method comprising:
- a display load for each sub-frame calculating step of calculating a display load to be imposed on a whole display surface each sub-frame; and
- a corrected period calculating step of calculating a corrected period of said display glowing period within each sub-frame according to a display load to be imposed on each sub-frame, which is calculated at said display load calculating step, so that brightness attained by display cells during sub-frames will be maintained at a given ratio.
- 9. A driving method for a display panel according to claim 8, wherein at said corrected period calculating step, a corrected period of said display glowing period within each sub-frame is calculated so that a brightness to be attained will be matched with the one permitted by a display load having a maximum value within a variation range.
- 10. A driving method for a display panel according to claim 8, wherein at said corrected period calculating step, a corrected period of said display glowing period is calculated so that a brightness to be attained will be matched with the one attained with imposition of the same display load as the one to be imposed during a sub-frame to which the largest display load is allotted.
- 11. A driving method for a display panel according to claim 8, wherein at said corrected period calculating step, a weighted means of display loads to be imposed during sub-frames is calculated in consideration of said weighting, and a corrected period of said display glowing period is calculated so that a brightness to be attained will be matched with the one attained with imposition of a display load of said weighted mean.
- 12. A driving method for a display panel according to claim 11, wherein said corrected period calculating step further includes a step of judging if a total sum of calculated corrected periods of display glowing periods exceeds a given length, and when said total sum exceeds said given length, correction is made so that said total sum will equal to said given length.
- 13. A driving method for a display panel according to claim 8, wherein at said corrected period calculating step, a median of display loads to be imposed during sub-frames is calculated, and a corrected period of said display glowing period is calculated so that a brightness to be attained will be matched with the one attained with imposition of a display load of said median.
- 14. A driving method for a display panel according to claim 8, wherein display loads to be imposed during sub-frames associated with large weights and represented by high-order bits are calculated at said display load calculating step, and a corrected period is calculated by said corrected period calculating means on the assumption that a given display load is imposed during any sub-frame other than said sub-frames associated with large weights and represented by high-order bits.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-225408 |
Sep 1995 |
JPX |
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7-343953 |
Dec 1995 |
JPX |
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Parent Case Info
This is a divisional of application Ser. No. 08/641,894 filed May 2, 1996.
US Referenced Citations (3)
Foreign Referenced Citations (3)
Number |
Date |
Country |
61-98389 |
May 1986 |
JPX |
6-348227 |
Dec 1994 |
JPX |
7-44127 |
Feb 1995 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
641894 |
May 1996 |
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