Transparent display devices including a polymer substrate comprising colored particles with improved flexible and mechanical properties

1. A transparent display device, comprising:

a substrate comprising a pixel area and a transmission area, the substrate comprising colored particles dispersed therein throughout the pixel area and the transmission area;

a barrier layer on the substrate;

a pixel circuit selectively disposed on a portion of the barrier layer on the pixel area;

a circuit insulation layer at least partially covering the pixel circuit on the barrier layer;

a via insulation layer covering the pixel circuit on the circuit insulation layer;

a first electrode on the via insulation layer, the first electrode being electrically connected to the pixel circuit;

a display layer on the first electrode; and

a second electrode facing the first electrode and covering the display layer,

wherein the via insulation layer is disposed only on the pixel area, and

wherein the substrate is a transparent flexible substrate.

2. The transparent display device of claim 1 ,

wherein the substrate further comprises a colored polymer material having a color different from a color of the colored particles.

3. The transparent display device of claim 2 , wherein the colors of the colored particles and the colored polymer material are added to each other such that the substrate becomes transparent.

4. The transparent display device of claim 3 , wherein the color of the colored particles is blue, and the color of the colored polymer material is yellow.

5. The transparent display device of claim 1 , further comprising a pixel defining layer on the via insulation layer, the pixel defining layer exposing a top surface of the first electrode,

wherein a transmitting window is defined on the transmission area by sidewalls of the pixel defining layer and the via insulation layer.

6. The transparent display device of claim 5 , wherein the circuit insulation layer comprises a gate insulation layer and an insulating interlayer sequentially stacked on the barrier layer,

the gate insulation layer and the insulating interlayer extend commonly on the pixel area and the transmission area, and

a top surface of the insulating interlayer is exposed by the transmitting window.

7. The transparent display device of claim 6 , wherein the barrier layer, the gate insulation layer, and the insulating interlayer comprise a silicon-based inorganic material, and

the via insulation layer comprises an organic polymer material.

8. The transparent display device of claim 4 , wherein the colored polymer material comprises a polyimide-based material, and

a charge transfer complex (CTC) is formed by an intermolecular interaction between imide nitrogens and carbonyl groups included in the polyimide-based material.

9. The transparent display device of claim 8 , wherein a connecting group comprising an unsubstituted aromatic ring is combined between the imide nitrogens neighboring each other.

10. The transparent display device of claim 4 , wherein each of the colored particles comprises:

a dispersed particle; and

a colored layer coating the dispersed particle or penetrating pores of the dispersed particle.

11. The transparent display device of claim 10 , wherein the dispersed particle comprises a silica nano-particle or a metal oxide particle.

12. The transparent display device of claim 10 , wherein the colored layer comprises at least one of anthraquinone, azo, phthalocyanine, indigo, and quinophthalone based materials.

13. The transparent display device of claim 4 , wherein the colored particles consist of blue dye molecules dispersed in the substrate.

14. The transparent display device of claim 13 , wherein the blue dye molecules are polymerized together with a precursor of the colored polymer material to be integrally incorporated with the colored polymer material.