Liquid crystal display device

A liquid crystal display device comprising:

• a first substrate;
• gate lines extending in a X direction on the first substrate;
• drain lines extending in a Y direction on the first substrate;
• a thin film transistor of a top-gate-type and a multi-gate type outputting a video signal from one of the drain lines to a pixel electrode in synchronism with a scanning signal from one of the gate lines, the thin film transistor having a first semiconductor layer as a first channel and a second semiconductor layer as a second channel;
• a second substrate facing the first substrate;
• a liquid crystal layer sandwiched between the first substrate and the second substrate;
• a backlight arranged in an opposing side of the first substrate against a side of the first substrate which is formed with the thin film transistor;
• and
• a light blocking layer formed between the first semiconductor layer and the backlight without extending between the second semiconductor layer and the backlight, wherein
• the thin film transistor has a gate electrode formed on a side more remote from the first substrate than the first semiconductor layer and the second semiconductor layer in a cross-sectional view,
• the light blocking layer overlaps with the gate electrode, and
• the gate electrode has edges opposite to each other in a width direction of the one of the gate lines, located within an area of the light blocking layer between opposite sides in the width direction.