Backlight module, manufacturing method thereof, and display module

A backlight module, comprising a back plate, a colored light source plate, a first color conversion layer and a plurality of first optical processing layers,

• wherein the colored light source plate, the first color conversion layer and the plurality of first optical processing layers are on the back plate and sequentially arranged away from the back plate;
• the colored light source plate is configured to emit non-white monochromatic light;
• the first color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the first color conversion layer, into white light;
• the plurality of first optical processing layers are each configured to scatter light incident into the first optical processing layer;
• the backlight module further comprises a second color conversion layer on at least a side, away from the back plate, of one of the plurality of first optical processing layers farthest from the back plate;
• an orthographic projection of the second color conversion layer on the first optical processing layer is in a peripheral edge region of the first optical processing layer;
• and
• the second color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the second color conversion layer, into white light,
• wherein the first optical processing layer further comprises a middle display region;
• a distribution density of the second color conversion layer is gradually reduced along any direction from the peripheral edge region to the middle display region of the first optical processing layer;
• the peripheral edge region of the first optical processing layer comprises a non-corner region and at least one corner region;
• the non-corner region comprises a non-display region and an edge display region;
• each of the at least one corner region comprises a non-display region and an edge display region;
• the non-display regions of the non-corner region and the corner region are connected to each other;
• and the edge display regions of the non-corner region and the corner region are connected to each other;
• and
• the non-display regions surround the edge display region;
• and the edge display regions surround the middle display region,
• wherein the distribution density of the second color conversion layer per area of square millimeter varies, in a direction from any one of the at least one corner region to the middle display region of the first optical processing layer, as follows:
• 100%→any distribution density in a range of 20% to 30%→any distribution density in a range of 10% to 15%→any distribution density in a range of 6% to 8%→any distribution density in a range of 1% to 3%.

A backlight module, comprising a back plate, a colored light source plate, a first color conversion layer and a plurality of first optical processing layers,

• wherein the colored light source plate, the first color conversion layer and the plurality of first optical processing layers are on the back plate and sequentially arranged away from the back plate;
• the colored light source plate is configured to emit non-white monochromatic light;
• the first color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the first color conversion layer, into white light;
• the plurality of first optical processing layers are each configured to scatter light incident into the first optical processing layer;
• the backlight module further comprises a second color conversion layer on at least a side, away from the back plate, of one of the plurality of first optical processing layers farthest from the back plate;
• an orthographic projection of the second color conversion layer on the first optical processing layer is in a peripheral edge region of the first optical processing layer;
• and
• the second color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the second color conversion layer, into white light,
• wherein the first optical processing layer further comprises a middle display region;
• a distribution density of the second color conversion layer is gradually reduced along any direction from the peripheral edge region to the middle display region of the first optical processing layer;
• the peripheral edge region of the first optical processing layer comprises a non-corner region and at least one corner region;
• the non-corner region comprises a non-display region and an edge display region;
• each of the at least one corner region comprises a non-display region and an edge display region;
• the non-display regions of the non-corner region and the corner region are connected to each other;
• and the edge display regions of the non-corner region and the corner region are connected to each other;
• and
• the non-display regions surround the edge display region;
• and the edge display regions surround the middle display region,
• wherein the second color conversion layer comprises a first part and a second part,
• an orthographic projection of the first part on the first optical processing layer covers the non-display region;
• an orthographic projection of the second part on the first optical processing layer is in the edge display region;
• and
• the second part comprises a plurality of sub-patterns arranged at intervals.