Plasma display panel drive pulse controller
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuhiro Kasahara, Yuichi Ishikawa, Tomoko Morita
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Abstract
A display apparatus has an adjusting device, which acquires image brightness data, and adjusts a weighting multiplier N on the basis of brightness data. The weighting multiplier N takes not only a positive integer, but also a decimal fraction numeral. In accordance with this, even if weighting multiplier N changes, an abrupt change in brightness does not occur, and a person watching the screen is not left with a sense of incongruousness.
Claims17
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:
- 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 average image brightness level;
- and
- a pulse number setting device that multiplies 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.
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:
- detecting an average image brightness level;
- determining a weighing multiple including a positive integer part and a fractional part, based on the average image brightness level, the weighing multiple being determined to increase as the average image brightness level decreases;
- 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.
Dependencies are inferred from the claim text.