SCANNING LIGHT-EMITTING CHIP AND PRINTING HEAD HAVING THEREOF

摘要

A scanning light-emitting chip and a printing head having one or more scanning light-emitting chips are provided. The scanning light-emitting chip has a shift circuit and a light-emitting circuit. The shift circuit includes shift thyristors, first diodes, a second diode, and shift signal lines. The light-emitting circuit includes light-emitting thyristors and a light-emitting control line. The first diodes are sequentially connected in series, and each first diode is electrically connected between two adjacent shift thyristors. A first end of the second diode is electrically connected to the connection between the first one of the first diode and the corresponding shift thyristor. A second end of the second diode is connected to the light-emitting control line or to ground through the ground resistor. Therefore, fewer control lines may be applied to actuate the shift circuit and to control the light emission of the light-emitting thyristors.

主权项

1. A scanning light-emitting chip, comprising:
a shift circuit, comprising:
a plurality of shift thyristors divided into a plurality of groups at intervals;a plurality of first diodes sequentially connected in series, and each of the first diodes is electrically connected between two adjacent shift thyristors;a plurality of shift signal lines, wherein the number of the shift signal lines is equal to the number of the groups, the shift signal lines correspond to the groups, respectively, and wherein each of the shift signal lines is electrically connected to the shift thyristors of the corresponding group; anda second diode having a first end and a second end, the first end of the second diode electrically connected to the connection between the first one of the first diodes and the corresponding shift thyristor; and a light-emitting circuit, comprising:
a plurality of light-emitting thyristors, each of the light-emitting thyristors electrically connected to a corresponding shift thyristor; anda light-emitting control line electrically connected to each of the light-emitting thyristors and electrically connected to the second end of the second diode.