Patent ID: 9072143
Filing Date: 2015-06-30
Classification: G09G,H05B,Y02B

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display panel; a backlight having at least one light-emitting diode; and an LED drive circuit for driving said at least one light-emitting diode, wherein the LED drive circuit includes a constant voltage circuit for controlling a voltage outputted from an output terminal in such a manner that a voltage inputted to a feedback terminal becomes a constant voltage, and a current mirror circuit for making current flow through said at least one light-emitting diode connected to the output terminal of the constant voltage circuit by a constant current, wherein the LED drive circuit includes at least one diode provided in a feedback path lying between the output terminal of the constant voltage circuit and the feedback terminal, wherein a reference current flows through the at least one diode in the feedback path, wherein the reference current does not flow through the at least one light-emitting diode, wherein the at least one diode is more particularly a first plural sequence of diodes, and the at least one light-emitting diode is more particularly a second plural sequence of light-emitting diodes, wherein each diode of the first plural sequence of diodes has a temperature dependence characteristic which is different from a temperature dependent characteristic of each light-emitting diode of the second plural sequence of light-emitting diodes, and wherein a number of diodes in the first plural sequence of diodes is set to have a forward voltage having a temperature dependence characteristic substantially coinciding with a temperature dependence characteristic of a forward voltage of the second plural sequence of light-emitting diodes.