Display apparatus displaying pseudo gray levels and method for displaying the same

A display apparatus comprising:

• a pseudo gray level data processor generating pseudo gray level data having m bits based on input gray level data having n bits representative of an input gray level of 2n gray levels, n being a natural number equal to or more than 2, and m being a natural number less than n, wherein
• said pseudo gray level data processor includes:
• a state variable generator generating a state variable data having n−m bits, based on lower n−m bits of said input gray level data,
• an adder calculating a sum of said lower n−m bits of said input gray level data and said state variable data to output a carry bit representative of carry-over of said sum, and
• a pseudo gray level data calculator generating said pseudo gray level data based on said input gray level data and said carry bit,
• wherein said pseudo gray level data calculator defines said pseudo gray level data such that said pseudo gray level data equals upper m bits of said input gray level data in a third case when said carry bit is “1” and said input gray level belongs to second gray levels of said 2n gray levels, and such that upper m−1 bits of said pseudo gray level data equals upper m−1 bits of said input gray level data and the LSB of said pseudo gray level data is selected from “0” and “1” in a fourth case when said carry bit is “0” and said input gray level data belongs to said second gray levels.

A display apparatus comprising:

• a pseudo gray level data processor generating pseudo gray level data having m bits based on input gray level data having n bits representative of an input gray level of 2n gray levels, n being a natural number equal to or more than 2, and m being a natural number less than n, wherein
• said pseudo gray level data processor includes:
• a state variable generator generating state variable data having n−m bits, based on lower n−m bits of said input gray level data,
• a subtracter calculating a difference said lower n−m bits of said input gray level data minus and said state variable data to output a carry bit representative of carry-over of said difference, and
• a pseudo gray level data calculator generating said pseudo gray level data based on said input gray level data and said carry bit, and
• wherein said pseudo gray level data calculator defines said pseudo gray level data such that said pseudo gray level data equals upper m bits of said input gray level data in a first case when said carry bit is “0” and said input gray level belongs to first gray levels of said 2n gray levels, and such that upper m−1 bits of said pseudo gray level data equals upper m−1 bits of said input gray level data and the LSB of said pseudo gray level data is selected from “0” and “1” in a second case when said carry bit is “1” and said input gray level data belongs to said first gray levels.

A display apparatus comprising:

• a pseudo gray level data processor generating pseudo gray level data having m bits based on input gray level data having n bits representative of an input gray level of 2n gray levels, n being a natural number equal to or more than 2, and m being a natural number less than n, wherein
• said pseudo gray level data processor includes:
• a state variable generator generating state variable data having n−m bits, based on lower n−m bits of said input gray level data,
• a subtracter calculating a difference said lower n−m bits of said input gray level data minus said state variable data to output a carry bit representative of carry-over of said difference, and
• a pseudo gray level data calculator generating said pseudo gray level data based on said input gray level data and said carry bit,
• wherein said pseudo gray level data calculator defines said pseudo gray level data such that said pseudo gray level data equals upper m bits of said input gray level data in a third case when said carry bit is “1” and said input gray level belongs to second gray levels of said 2n gray levels, and such that upper m−1 bits of said pseudo gray level data equals upper m−1 bits of said input gray level data and the LSB of said pseudo gray level data is selected from “0” and “1” in a fourth case when said carry bit is “0” and said input gray level data belongs to said second gray levels.

A method of generating pseudo gray level data representative of pseudo gray level, comprising:

• sequentially inputting input gray level data, each of which has n bits and is representative of an input gray level of 2n gray levels, n being a natural number equal to or more than 2, and
• sequentially generating pseudo gray level data having m bits based on said input gray level data, m being a natural number less than n, wherein
• said sequentially generating includes:
• delaying work data having n−m bits by a duration substantially equal to a temporal interval at which said input gray level data is inputted to output state variable data,
• calculating a sum of lower n−m bits of said input gray level data and said state variable data,
• outputting said sum as said work data,
• outputting a carry bit of said sum,
• defining said pseudo gray level data
• such that said pseudo gray level data equals upper m bits of said input gray level data in a first case when said carry bit is “0” and said input gray level belongs to first gray levels of said 2n gray levels, and
• defining said pseudo gray level data
• such that upper m−1 bits of said pseudo gray level data equals upper m−1 bits of said input gray level data and the LSB of said pseudo gray level data is selected from “0” and “1” in a second case when said carry bit is “1” and said input gray level data belongs to said first gray levels.

The method of generating pseudo gray level data representative of pseudo gray level, comprising:

• sequentially inputting input gray level data, each of which has n bits and is representative of an input gray level of 2n gray levels, n being a natural number equal to or more than 2, and
• sequentially generating pseudo gray level data having m bits based on said input gray level data, m being a natural number less than n, wherein
• said sequentially generating includes:
• delaying work data having n−m bits by a duration substantially equal to a temporal interval at which said input gray level data is inputted to output state variable data,
• calculating a difference lower n−m bits of said input gray level data minus said state variable data,
• outputting said difference as said work data,
• outputting a carry bit of said difference,
• defining said pseudo gray level data
• such that said pseudo gray level data equals upper m bits of said input gray level data in a first case when said carry bit is “0” and said input gray level belongs to first gray levels of said 2n gray levels, and
• defining said pseudo gray level data
• such that upper m−1 bits of said pseudo gray level data equals upper m−1 bits of said input gray level data and the LSB of said pseudo gray level data is selected from “0” and “1” in a second case when said carry bit is “1” and said input gray level data belongs to said first gray levels.