Display substrate having wavelength-actuatable color filter, display apparatus having the same, and method of operating display apparatus

1. A display substrate, comprising:

a base substrate;

a color filter on the base substrate and comprising a plurality of color filter blocks; and

an actuator configured to actuate a respective color filter block of the plurality of color filter blocks thereby controlling a wavelength of light transmitted through the respective color filter block;

wherein the plurality of color filter blocks comprise at least a plurality of first color filter blocks and a plurality of second color filter blocks;

the actuator is configured to actuate a respective first color filter block of the plurality of first color filter blocks so that light of a first color transmitted through the respective first color filter block, and actuate a respective second color filter block of the plurality of second color filter blocks so that light of a second color transmitted through the respective second color filter block, the first color being different from the second color; and

orthographic projections of the respective first color filter block and the respective second color filter block on the base substrate are non-overlapping with each other.

2. The display substrate of claim 1 , wherein the actuator is configured to control a thickness of the respective color filter block thereby controlling the wavelength of light transmitted through the plurality of color filter blocks.

3. The display substrate of claim 1 , wherein the respective color filter block comprises a liquid crystal elastomer.

4. The display substrate of claim 3 , wherein the respective color filter block comprises a cross-linked polymer of a liquid crystal elastomer, a low molecular weight liquid crystal molecule, and a crosslinking monomer.

5. The display substrate of claim 4 , wherein the crosslinking monomer is a photopolymerizable monomer.

6. The display substrate of claim 4 , wherein the cross-linked polymer comprises approximately 10% w/w to approximately 70% w/w liquid crystal elastomer, approximately 4% w/w to approximately 86.99% w/w low molecular weight liquid crystal monomeric unit, and approximately 3% w/w to approximately 25% w/w crosslinker unit.

7. The display substrate of claim 4 , wherein the liquid crystal elastomer is a siloxane liquid crystal elastomer.

8. The display substrate of claim 4 , wherein the liquid crystal elastomer is a siloxane liquid crystal elastomer having a structure of formula I:

wherein R 1 is a liquid crystal monomeric unit, R 2 is a crosslinker unit, and R 3 is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl.

9. The display substrate of claim 8 , wherein R 1 is

and

R 2 is

10. The display substrate of claim 4 , wherein the low molecular weight liquid crystal molecule is selected from the group consisting of

wherein * stands for a free radical.

11. The display substrate of claim 1 , wherein the actuator is an electrical actuator comprising a plurality of electrodes for actuating the respective color filter block.

12. The display substrate of claim 11 , wherein the actuator further comprises an electroactive layer;

the electroactive layer comprises a plurality of electroactive blocks, a respective electroactive block of the plurality of electroactive blocks corresponding to one of the plurality of color filter blocks; and

the respective electroactive block is configured to be actuated by one of the plurality of electroactive blocks so that the wavelength of light transmitted through the respective electroactive block changes in response to a change in an electrical signal applied to the one of the plurality of color filter blocks.

13. The display substrate of claim 12 , wherein the respective electroactive block is configured to exert a force to one of the plurality of color filter blocks for changing a thickness of the one of the plurality of color filter blocks thereby controlling the wavelength of light transmitted through the respective color filter block.

14. The display substrate of claim 12 , wherein

the plurality of electroactive blocks comprises at least a plurality of first electroactive blocks and a plurality of second electroactive blocks;

a respective first electroactive block of the plurality of first electroactive blocks is configured to actuate the respective first color filter block so that light of a first color transmitted through the respective first color filter block; and

a respective second electroactive block of the plurality of second electroactive blocks is configured to actuate the respective second color filter block so that light of a second color transmitted through the respective second color filter block.

15. The display substrate of claim 12 , wherein a projection of the respective color filter block on the base substrate at least partially overlaps with a projection of one of the plurality of electroactive blocks on the base substrate.

16. The display substrate of claim 15 , further comprising a black matrix in an inter-subpixel region of the display substrate;

wherein a projection of the black matrix on the base substrate covers a projection of the plurality of electrodes on the base substrate.

17. A display apparatus, comprising the display substrate of claim 1 .

18. A method of operating a display apparatus comprising the display substrate of any one of claim 1 ; the method comprising actuating the respective color filter block thereby controlling a wavelength of light transmitted through the respective color filter block.

19. The method of claim 18 , further comprising:

dividing the plurality of color filter blocks into N1 numbers of groups of color filter blocks in a first color display mode;

dividing the plurality of color filter blocks into N2 numbers of groups of color filter blocks in a second color display mode, N1 and N2 being two different positive integers;

actuating at least one group of the N1 groups of the color filter blocks in the first color display mode so that light transmitted through each group of the N1 groups of the color filter blocks has different colors; and

actuating at least one group of the N2 groups of the color filter blocks in the second color display mode so that light transmitted through each group of the N2 groups of the color filter blocks has different colors.