PDP display drive pulse controller
First Claim
1. A display apparatus for creating, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weighing value for each subfield, and a number of gradation display points, the display apparatus comprising:
- a peak level detector that detects a peak image brightness level;
an average level detector that detects an average image brightness level;
an image characteristic determining device that determines a weighing multiple including a positive integer part and a fractional part, based on the peak image brightness level and the average image brightness level; and
a pulse number setting device that multiples the weighing multiple by the weighing value of each subfield to obtain a product capable of having a positive integer part and a fractional part, and that defines an integer value near the product as a number of drive pulses for each subfield;
wherein the image characteristic determining device increases the weighing multiple as the average image brightness level decreases and as the peak image brightness level increases.
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Abstract
A display apparatus creates, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weighing value for each subfield, and a number of gradation display points. The display apparatus detects a peak image brightness level and an average image brightness level. A weighing multiple including a positive integer part and a fractional part is determined based on the peak image brightness level and the average image brightness level. The weighing multiple is multiplied by the weighing value of each subfield to obtain a product capable of having a positive integer part and a fractional part. An integer value near the product is defined as a number of drive pulses for each subfield. The weighing multiple is increased as the average image brightness level decreases and as the peak image brightness level increases.
78 Citations
18 Claims
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1. A display apparatus for creating, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weighing value for each subfield, and a number of gradation display points, the display apparatus comprising:
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a peak level detector that detects a peak image brightness level;
an average level detector that detects an average image brightness level;
an image characteristic determining device that determines a weighing multiple including a positive integer part and a fractional part, based on the peak image brightness level and the average image brightness level; and
a pulse number setting device that multiples the weighing multiple by the weighing value of each subfield to obtain a product capable of having a positive integer part and a fractional part, and that defines an integer value near the product as a number of drive pulses for each subfield;
wherein the image characteristic determining device increases the weighing multiple as the average image brightness level decreases and as the peak image brightness level increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a display apparatus that creates, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weighing value for each subfield, and a number of gradation display points, the method comprising:
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detecting a peak image brightness level;
detecting an average image brightness level;
determining a weighing multiple including a positive integer part and a fractional part, based on the peak image brightness level and the average image brightness level, the determined weighing multiple increasing as the average image brightness level decreases and as the peak image brightness level increases;
multiplying the weighing multiple by the weighing value of each subfield to obtain a product capable of having a positive integer part and a fractional part;
defining an integer value near the product, as a number of drive pulses for each subfield. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification