Patent ID: 9208728
Filing Date: 2015-12-08
Classification: G09G

Abstract:
1. A display apparatus comprising: a signal processor which processes a video signal; a display which displays an image based on the video signal processed by the signal processor, the display including a light source providing light for displaying the image; and a driving circuit which drives the light source on the basis of a dimming signal having an on-section and an off-section for dimming the light source, wherein the driving circuit includes: wherein the protection circuit comprises a circuit device which connects the input side ground and an output side ground of the driving circuit during the on-section, and disconnects the input side ground and the output side ground of the driving circuit during the off-section, wherein the circuit device comprises a first end and a second end which are directly connected to the input side ground and the output side ground of the driving circuit, respectively, and wherein the protection circuit includes: a detection device which is connected between the input side ground and the output side ground of the driving circuit and detects an electric current flowing in the light source; and a protection device which is connected in parallel to the detection device and protects the detection device from voltage applied when the driving circuit stops operating, wherein the determination circuit unit includes: a pair of comparators; a first switch which receives a control signal corresponding to the dimming signal which is turned on to detect a short circuit based on the voltage of the input side ground if the dimming signal is in the on-section; and a second switch which receives a reversal signal of the control signal and which is turned on to detect short circuit based on the feedback voltage of the output side ground if the dimming signal is in the off-section.