TWI551923B

The invention provides an electronic device, and display device and control device having the same for efficiently introducing light emitted from a light source part to the inside of a light guide panel so as to increase the utilization of light. According to the invention, a temperature regulator comprises a control substrate (21), a LED (22), a reflection film (23) and a light guide panel (24), wherein the LED (22a,22b) is mounted on the control substrate and emits light along a direction parallel to a surface of the control substrate. The reflection film is arranged at an interval on the control substrate adjacent to the LED, and reflects light in a direction crossing the control substrate. The light guide panel is arranged on the reflection film and is provided with a protrusion part (25) which is inside a gap formed between an end surface on the light emitting side of the LED and an end surface of the reflection film and is opposite to the end surface on the light emitting side of the LED. The light guid