Display device
AssigneePioneer Plasma Display Corporation
InventorYasunori Takahashi
Life of this patent
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Abstract
A gradation circuit is provided with an error diffusion circuit, a dither pattern circuit and a switch. The error diffusion circuit converts a digital signal into a signal indicative of a level of gradation by an error diffusion method. The dither pattern circuit converts a digital signal into a signal indicative of a level of gradation by a dithering method. The switch selects for output between an output signal of the error diffusion circuit and an output signal of the dither patter circuit as on output signal of the gradation circuit.
Claims15
A display device comprising:
- a first input terminal for receiving an analog image signal;
- a second input terminal for receiving a digital image signal;
- an analog-to-digital converter connected to said first input terminal;
- a first switch for selecting an output between a digital signal outputted from said analog-to-digital converter and a digital signal inputted to said second input terminal;
- and
- a gradation circuit for converting a digital signal outputted from said first switch into a signal indicative of a level of pseudo gradation, said gradation circuit comprising:
- an error diffusion circuit for converting said digital signal outputted from said first switch into a signal indicative of a level of pseudo gradation by an error diffusion method;
- a dither pattern circuit for converting said digital signal outputted from said first switch into a signal indicative of a level of pseudo gradation by a dithering method;
- and
- a second switch for converting for output between an output signal of said error diffusion circuit and an output signal of said dither pattern circuit.
A video display device capable of receiving a digital video signal converted from an analog input video signal and a digital input video signal, said display comprising a gradation circuit wherein:
- a pseudo intermediate gradation process can be executed in both an error diffusion method and a dithering method, and
- when said digital video signal converted from said analog input video signal is input, said pseudo intermediate gradation process in said error diffusion method is selected, whereas when said digital input video signal is input, said pseudo intermediate gradation process in said dithering method is selected.
Dependencies are inferred from the claim text.