US 6,271,821 B1 · Interface for liquid crystal display

Abstract

A liquid crystal display (LCD) interface for communicating a video signal to an LCD comprises a video input device for separating the video signal into a synchronizing signal and R (Red), G (Green) and B (Blue) video signals having a resolution of m rows by n columns, a controller for generating a first clock frequency, a second clock frequency and a third clock frequency being half the second clock frequency based on the synchronizing signal, an R signal converter for dividing the frequency of the R video signal by four according to the first clock frequency to sequentially generate two adjacent pixel column data simultaneously starting both from the first pixel row and the ((m/2)+1)st pixel row respectively to the (m/2)th pixel row and mth pixel row according to the second clock frequency fo so that the four pixel data arranged in the adjacent pixel columns are simultaneously generated, a G signal converter for dividing the frequency of the G video signal by four according to the first clock frequency to sequentially generate two adjacent pixel column data simultaneously starting both from the first pixel row and the ((m/2)+1)st pixel row respectively to the (m/2)th pixel row and mth pixel row according to the second clock frequency fo so that the four pixel data arranged in the adjacent pixel columns are simultaneously generated, a B signal converter for dividing the frequency of the B video signal by four according to the first clock frequency to sequentially generate two adjacent pixel column data simultaneously starting both from the first pixel row and the ((m/2)+1)st pixel row respectively to the (m/2)th pixel row and mth pixel row according to the second clock frequency fo so that the four pixel data arranged in the adjacent pixel columns are simultaneously generated, and an LCD driver for supplying the pixel data from the R, G, B converters to an LCD panel.

Claims9

Dependent claims

A liquid crystal display (LCD) interface for communicating a video signal to an LCD comprising:

a video input device for separating said video signal into a synchronizing signal and R (Red), G (Green) and B (Blue) video signals having a resolution of m rows by n columns;
a controller for generating a first clock frequency, a second clock frequency and a third clock frequency, said third clock frequency being half said second clock frequency based on said synchronizing signal;
a R signal converter for dividing the frequency of said R video signal by four according to said first clock frequency to sequentially generate two adjacent pixel column data simultaneously starting both from the first pixel row and the ((m/2)+1)st pixel row respectively to the (m/2)th pixel row and mth pixel row according to said second clock frequency so that the four pixel data arranged in the adjacent pixel columns are simultaneously generated;
a G signal converter for dividing the frequency of said G video signal by four according to said first clock frequency to sequentially generate two adjacent pixel column data simultaneously starting both from the first pixel row and the ((m/2)+1)st pixel row respectively to the (m/2)th pixel row and mth pixel row according to said second clock frequency so that the four pixel data arranged in the adjacent pixel columns are simultaneously generated;
a B signal converter for dividing the frequency of said B video signal by four according to said first clock frequency to sequentially generate two adjacent pixel column data simultaneously starting both from the first pixel row and the ((m/2)+1)st pixel row respectively to the (m/2)th pixel row and mth pixel row according to said second clock frequency so that the four pixel data arranged in the adjacent pixel columns are simultaneously generated;
and
an LCD driver for supplying the pixel data from said R, G, B converters to an LCD panel.

4 more elements

A liquid crystal display (LCD) interface for communicating a video signal to an LCD comprising:

a video input device for separating said video signal into a synchronizing signal and R (Red), G (Green) and B (Blue) video signals having a resolution of m rows by n columns;
a controller for generating a first clock frequency, a second clock frequency and a third clock frequency, said third clock frequency being half said second clock frequency based on said synchronizing signal;
first, second and third signal converters, each of said first, second and third signal converters being responsive to said first, second and third clock frequencies, each of said first, second and third signal converters receiving a respective one of said R, G and B video signals, dividing a frequency of the respective one of said R, G and B video signals by four and sequentially outputting adjacent first and second pixel column data simultaneously, wherein said first pixel column data corresponds to pixel data between the first pixel row and the (m/2)th pixel row and said second pixel column data corresponds to pixel data between the ((m/2)+1)st pixel row and the and mth pixel row;
and
an LCD driver for supplying the adjacent first and second pixel column data from said first, second and third signal converters to an LCD panel.

2 more elements

A method of communicating a video signal to a liquid crystal display, comprising the steps of:

separating said video signal into a synchronizing signal and R (Red), G (Green) and B (Blue) video signals having a resolution of m rows by n columns;
generating a first clock frequency, a second clock frequency and a third clock frequency, said third clock frequency being half said second clock frequency based on said synchronizing signal;
dividing a frequency of each of said R, G and B video signals by four and outputting sequential pixel data of adjacent first and second pixel column data simultaneously, wherein said first pixel column data corresponds to pixel data between the first pixel row and the (m/2)th pixel row and said second pixel column data corresponds to pixel data between the ((mn/2)+1)st pixel row and the and mth pixel row, in response to said first, second and third clock frequencies;
and
supplying the adjacent first and second pixel column data to said liquid crystal display for display on a liquid crystal display panel.

2 more elements

Dependencies are inferred from the claim text.

Interface for liquid crystal display

Life of this patent

Interface for liquid crystal display

Life of this patent

Abstract

Claims9