A backlight module, comprising a light board and a heat dissipation structure, wherein a plurality of light-emitting elements are arranged in a matrix on the light board, and wherein the heat dissipation structure is arranged on a side of the light board facing away from the plurality of light-emitting elements;
- wherein the heat dissipation structure comprises a first control layer and a second control layer, wherein the first control layer is arranged on the side of the light board facing away from the plurality of light-emitting elements and is disposed opposite to the second control layer, and wherein there is defined a gap between the first control layer and the second control layer, and there is disposed a coolant droplet in the gap;
- wherein when a light-emitting element satisfies a first heating condition, the first control layer and the second control layer are configured to control the coolant droplet to move to a position underneath the light-emitting element;
- when the light-emitting element satisfies a second heating condition, the first control layer and the second control layer are configured to control the coolant droplet to leave the position underneath the light-emitting element;
- wherein the heat dissipation structure further comprises a low-temperature coolant storage region and a high-temperature coolant storage region;
- the low-temperature coolant storage region is configured to store a coolant that has not absorbed the heat of the light-emitting element;
- the high-temperature coolant storage region is configured to store a coolant that has absorbed the heat of the light-emitting element;
- the low-temperature coolant storage region defines a plurality of first through holes corresponding to the gap between the first control layer and the second control layer, and the high-temperature coolant storage region defines a plurality of second through holes corresponding to the gap between the first control layer and the second control layer;
- an orientation in which the low-temperature coolant storage region is located is a first orientation, and an orientation where the high-temperature coolant storage region is located is a second orientation;
- and the first control electrode layer and the second control electrode layer are configured to control the coolant droplet to move from the first orientation to the second orientation;
- wherein the second control layer comprises a second control electrode layer, the second control electrode layer comprises a plurality of second control electrodes;
- the plurality of second control electrodes further comprises a plurality of first electrodes and a plurality of second electrodes, wherein the plurality of first electrodes are arranged in the low-temperature coolant storage region at a position adjacent to each first through hole, and wherein the plurality of second electrodes are arranged in the high-temperature coolant storage region at a position adjacent to each second through hole;
- an orthographic projection of the first control electrode layer in a direction perpendicular to the substrate covers orthographic projections of the plurality of first electrodes and the plurality of second electrodes in the direction perpendicular to the substrate;
- by changing the electrical properties of the plurality of first electrodes, at the position of the first through hole, the coolant that has not absorbed the heat of the light emitting element is divided, so that the coolant that has not absorbed the heat of the light emitting element flows out in the form of droplets;
- by changing the electrical properties of the plurality of second electrodes, at the position of the second through hole, the coolant droplet flowing toward the high-temperature coolant storage region enters the second through hole.