Touch display module, control method thereof and display device

1. A touch display module, comprising:

a display module, a touch module and a circular polarizer which are sequentially stacked, wherein the touch module comprises a substrate, a predetermined included angle exists between a direction of a first phase difference generated by ambient light irradiating the substrate and a direction of a second phase difference generated by the ambient light irradiating the circular polarizer, the predetermined included angle makes a sum of the first phase difference and the second phase difference a predetermined phase difference, and in a screen-off state of the touch display module, when the ambient light enters the touch display module, the predetermined phase difference enables only light with a predetermined color to be reflected from the touch display module.

2. The touch display module according to claim 1 , wherein the predetermined included angle is 0 degree to 90 degrees.

3. The touch display module according to claim 2 , wherein the predetermined included angle is 0 degree or 90 degrees.

4. The touch display module according to claim 1 , wherein the predetermined phase difference ranges from 136 nm to 154 nm.

5. The touch display module according to claim 4 , wherein the predetermined phase difference is 151 nm or 143 nm.

6. The touch display module according to claim 1 , wherein the touch display module satisfies at least one of the following conditions:

when the predetermined included angle is 90 degrees, the predetermined phase difference is 143 nm, and the predetermined wavelength is 605 nm to 700 nm, only red light may be reflected from the touch display module;

when the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and the predetermined wavelength is 500 nm to 560 nm, only green light may be reflected from the touch display module; and

when the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and the predetermined wavelength is 450 nm to 480 nm, only blue light may be reflected from the touch display module.

7. The touch display module according to claim 6 , wherein the direction of the first phase difference is parallel to a short side of the touch display module, the direction of the second phase difference is parallel to a long side of the touch display module, the predetermined included angle is 90 degrees, the predetermined phase difference is 143 nm, and only red light may be reflected from the touch display module.

8. The touch display module according to claim 6 , wherein the direction of the first phase difference is parallel to a short side of the touch display module, the direction of the second phase difference is parallel to a short side of the touch display module, the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and only green light may be reflected from the touch display module.

9. The touch display module according to claim 6 , wherein the direction of the first phase difference is parallel to a long side of the touch display module, the direction of the second phase difference is parallel to the long side of the touch display module, the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and only blue light may be reflected from the touch display module.

10. The touch display module according to claim 1 , wherein the substrate comprises a cycloolefin polymer resin layer; and the circular polarizer comprises a quarter-wave plate and a polyvinyl alcohol layer which are stacked.

11. A display device, comprising:

a touch display module comprising a display module, a touch module and a circular polarizer which are sequentially stacked, wherein the touch module comprises a substrate, a predetermined included angle exists between a direction of a first phase difference generated by ambient light irradiating the substrate and a direction of a second phase difference generated by the ambient light irradiating the circular polarizer, the predetermined included angle makes a sum of the first phase difference and the second phase difference a predetermined phase difference, and in a screen-off state of the touch display module, when the ambient light enters the touch display module, the predetermined phase difference enables only light with a predetermined color to be reflected from the touch display module.

12. The display device according to claim 11 , wherein the predetermined included angle is 0 degree to 90 degrees.

13. The display device according to claim 11 , wherein the predetermined phase difference ranges from 136 nm to 154 nm.

14. The display device according to claim 11 , wherein the touch display module satisfies at least one of the following conditions:

when the predetermined included angle is 90 degrees, the predetermined phase difference is 143 nm, and the predetermined wavelength is 605 nm to 700 nm, only red light may be reflected from the touch display module;

when the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and the predetermined wavelength is 500 nm to 560 nm, only green light may be reflected from the touch display module; and

when the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and the predetermined wavelength is 450 nm to 480 nm, only blue light may be reflected from the touch display module.

15. The display device according to claim 14 , wherein the direction of the first phase difference is parallel to a short side of the touch display module, the direction of the second phase difference is parallel to a long side of the touch display module, the predetermined included angle is 90 degrees, the predetermined phase difference is 143 nm, and only red light may be reflected from the touch display module.

16. The display device according to claim 14 , wherein the direction of the first phase difference is parallel to a short side of the touch display module, the direction of the second phase difference is parallel to the short side of the touch display module, the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and only green light may be reflected from the touch display module.

17. The display device according to claim 14 , wherein the direction of the first phase difference is parallel to a long side of the touch display module, the direction of the second phase difference is parallel to the long side of the touch display module, the predetermined included angle is 0 degree, the predetermined phase difference is 151 nm, and only blue light may be reflected from the touch display module.

18. The display device according to claim 11 , wherein the substrate comprises a cycloolefin polymer resin layer; and the circular polarizer comprises a quarter-wave plate and a polyvinyl alcohol layer which are stacked.

19. The display device according to claim 11 , wherein a color of a shell of the display device is the same as or complementary to a color of the touch display module in the screen-off state.

20. A method for controlling a touch display module to display a predetermined color in a screen-off state, wherein the touch display module comprises a display module, a touch module and a circular polarizer which are sequentially stacked, the touch module comprises a substrate, and the method comprises:

allowing a direction of a first phase difference generated by ambient light irradiating the substrate and a direction of a second phase difference generated by the ambient light irradiating the circular polarizer to have a predetermined included angle therebetween, wherein the predetermined included angle makes a sum of the first phase difference and the second phase difference a predetermined phase difference, and light reflected after the ambient light enters the touch display module is light with a predetermined color.