Hitachi, Ltd.

Hitachi Video and Information System, Inc.

Hitachi Video Engineering, Incorporated

Masahiro Jinushi

Kiyokazu Nishioka

Nobuo Tsuchiya

Terumi Takashi

Hideki Kamimaki

Hiroshi Ito

Tsuguji Tachiuchi

Takao Ohba

Koichi Isaji

Hitoshi Sadamitsu

Takashi Yoshitomi

Kazuya Kouchiyama

A display controller of a flat display apparatus which performs multiple color display and variable color display for display data read out of a lookup table. The lookup table comprises a parallel lookup table which has n (n.gtoreq.2) registers for storing color information and m selectors which receive n pieces of color information independently from the n registers, each select one of n pieces of color information, and deliver m pieces of color information simultaneously. The controller further comprises a data selector which selectively delivers the output of other register in the parallel lookup table in place of the register which has been made the read access.

Display controller for a flat display apparatus

A data processing apparatus which includes a display unit and a power supply controller for supplying power to the display unit. The display unit has a display screen and a back light controller. The power supply controller comprises a switch, at least one output line for receiving the power from the switch and for supplying therethrough the power to electronic devices, a delay circuit for receiving the power from the switch and when the switch is turned ON to start supply of the power, for outputting the power after passage of a predetermined time from the start of the power supply, and a second output line for supplying the power from the delay circuit to the back light controller therethrough. The display unit has a memory means for storing therein a luminance data on the display screen through the back light controller when the power supply is turned OFF and for determining an output state of the display unit through the back light controller on the basis of the luminance data read out from the memory means when the power supply is turned ON. Further, the data processing apparatus has a means for invalidating output of a display data to be output onto the display screen and a means, after the display data is invalidated, for reducing a frequency of a timing signal or invalidating output of the timing signal for the display unit.

Data processing apparatus, power supply controller and display unit

A display controller of a flat display apparatus which performs multiple color display and variable color display for display data read out of a lookup table. The lookup table comprises a parallel lookup table which has n (n.ltoreq.2) registers for storing color information and m selectors which receive n pieces of color information independently from the n registers, each select one of n pieces of color information, and deliver m pieces of color information simultaneously. The controller further comprises a data selector which selectively delivers the output of another register to in the parallel lookup table in place of the register to which the read access has been made.

A half-tone color representation system suitable for use with a multi-color liquid crystal display panel, each display dot of which is constituted by three primary color pixels. More than eight different colors are represented with the three primary color pixels by providing a 'half-tone' state of a pixel which is realized through successive ON-OFF controlling of the pixel. Flicker in the half-tone color representation of the display dot is reduced by causing the patterns or timings of successive ON-OFF controlling of the three primary color pixels to be different from one another.

Half-tone representation system and controlling apparatus therefor

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Fujisawa, Japan

Masahiro Jinushi