Other

Hideki Ohmae

Adam J Kunzman

Hisakazu Hitomi

A tone display method which prevents degradation in image quality of moving images when the subfield method is utilized without an increase in cost. When tone display is performed with 256 tones with respect to one certain color, in each frame, segments 1 to 6 in time are set corresponding to the plural time-shared time bands of the color and each segment includes one or several subfields (sf). In each case, as the tone is increased by 42 (or 43) for segments 1 through 6, sequentially, the subfields in the segment being lit so that the tone is increased continuously. In each segment, the display is performed mostly according to the binary method for the subfields

Tone display method

A tone display method is provided that can prevent image quality deterioration of the dynamic image and can avoid a cost increase. When an image with 256 tones is displayed, one field is divided into 37 subfields for one color. Among the 8 bits corresponding to the 256 tones, the six high-order bits from the third bit are displayed by means of time width modulation using 35 subfields SF,-SF,having weights of &ldquo;&ldquo;4&rdquo; and &ldquo;8&rdquo;. The two low-order bits are displayed on a binary base using two subfields SF,and SF,whose weights are &ldquo;'1&rdquo; and &ldquo;2&rdquo;, respectively.

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Sandai, Japan

Hideki Ohmae