Please select the most similar patent number from A, B, C and D. Which number is?
A stacked printed circuit board (20). The stacked printed circuit board (20) is applied to an unmanned aerial vehicle, and comprises a first printed circuit board (21), a second printed circuit board (22), and multiple solder balls (23) connecting the first printed circuit board (21) to the second printed circuit board (22). The first printed circuit board (21) comprises multiple first solder joints (210); the second printed circuit board (22) comprises multiple second solder joints (220); each solder ball (23) is soldered between a first solder joint (210) and a corresponding second solder joint (220), so as to form, on the stacked printed circuit board (20), a first link (201) and a second link (202) which are not electrically connected to each other; the solder balls (23) forming the first link (201) and the solder balls (23) forming the second link (202) are staggered with each other. According to the present invention, the problems of an open circuit and a short circuit in printed circuit board soldering can be conveniently detected.
A: A backlight module and a display device. The backlight module comprises a plurality of light strips (21) arranged sequentially in a first direction in a same plane (10). Each of the light strips (21) extends in a second direction in the plane (10) and comprises a printed circuit board (23) and a plurality of light sources (22). The printed circuit board (23) has a first installation surface (23a) and a second installation surface (23b) that are opposing to each other and not parallel to the plane (10). The plurality of light sources (22) are electrically connected to the printed circuit board (23) and comprise a plurality of first light sources (221) disposed on the first installation surface (23a) of the printed circuit board (23) and a plurality of second light sources (222) disposed on the second installation surface (23b). The backlight module has higher brightness.
B: A multi-line laser module (902, 1002), a laser radar, and a movable platform. The multi-line laser module (902, 1002) comprises: a laser device (204), provided on a printed circuit board; multiple switch elements (202), provided on the printed circuit board, separately coupled to the laser device (204), and used for controlling the laser device (204) to emit multiple laser beams; and at least one capacitor element (203), provided on the printed circuit board, coupled to the laser device (204), and used for driving the laser device (204) to emit multiple laser beams. The laser device (204) comprises multiple lasers (201); the multiple lasers (201) form at least two discharge loops on the printed circuit board; each discharge loop comprises: at least one first laser (201) in the multiple lasers (201), and the switch element (202) and the capacitor element (203) coupled to the at least one first laser (201); a difference between loop equivalent inductances corresponding to any two discharge loops is less than a preset value.
C: A touchscreen, comprising: a display unit, which comprises an upper substrate (130); a lower substrate (110), the lower substrate (110) being provided thereon with a plurality of thin film transistors, a drive circuit (210) and a printed circuit board (220), the plurality of thin film transistors being electrically connected to the drive circuit (210), and the drive circuit (210) being electrically connected to the printed circuit board (220); a touch unit (140), comprising a first touch electrode (141), the first touch electrode (141) being electrically connected to the printed circuit board (220) by means of first leads (180, 380); a second touch electrode (142) electrically insulated from the first touch electrode (141), the second touch electrode (142) being electrically connected to the printed circuit board (220) by means of second leads (190, 390), wherein the first leads (180, 380) are electrically connected to the printed circuit board (220) by spanning over the space between the printed circuit board (220) and the first touch electrode (141), and the second leads (190, 390) are electrically connected to the printed circuit board (220) by spanning over the space between the printed circuit board (220) and the second touch electrode (142). Thus, the present invention has the advantage of reducing cost.
D: The present invention provides a printed circuit board and a display device. The printed circuit board comprises a first wire layer, a reference ground layer disposed above and insulated from the first wire layer, and a third wire layer disposed above and insulated from the reference ground layer. The first wire layer comprises a GOA signal wire group, a data signal wire group, and a signal isolation wire disposed on the same plane. The GOA signal wire group and the data signal wire group are respectively located on both sides of the signal isolation wire. The signal interference between the wire layers in the printed circuit board can be avoided, and the stable operation of the display device is effective ensured.
Answer: D