Transparent display device and vehicle display device

Abstract

A transparent display device includes a first circular polarizing unit, a second circular polarizing unit, a self-emissive display module, and a liquid crystal module. The second circular polarizing unit overlaps the first circular polarizing unit. The self-emissive display module is located between the first and second circular polarizing units. The liquid crystal module is located between the first and second circular polarizing units or between the second circular polarizing unit and the self-emissive display module. An automotive display device is also provided.

Claims

1. A transparent display device, comprising: The first polarizing unit includes a first linear polarizer and a quarter-wavelength compensation plate; A second polarizing unit, overlapping the first polarizing unit, and including a second linear polarizer and a three-quarter wavelength compensation plate; a self-emissive display module, located between the first polarizing unit and the second polarizing unit; and a liquid crystal module, located between the first polarizing unit and the self-emissive display module or between the second polarizing unit and the self-emissive display module, wherein both the self-emissive display module and the liquid crystal module are located between the quarter wavelength compensation plate and the three-quarter wavelength compensation plate, wherein ambient light enters the first linear polarizer and becomes first linearly polarized light and leaves the first linear polarizer, then enters the quarter wavelength compensation plate as second linearly polarized light and becomes first circularly polarized light and leaves the first polarizing unit, then enters the liquid crystal module as second circularly polarized light and is modulated into first elliptically polarized light and leaves the liquid crystal module, then passes through the self-emissive display module as third elliptically polarized light and leaves the self-emissive display module, then passes through the three-quarter wavelength compensation plate as fourth elliptically polarized light and leaves the three-quarter wavelength compensation plate. Then, the sixth elliptically polarized light passes through the second linear polarizer and becomes the third linearly polarized light before leaving the second polarizing unit.

2. The transparent display device as claimed in claim 1, wherein the liquid crystal module is suitable for twisted nematic, electric field controlled birefringence, super-twisted nematic, edge field switching, or coplanar switching liquid crystal modes.

3. The transparent display device as claimed in claim 1, wherein the self-emissive display module includes a light-emitting element encapsulated on a substrate by an insulating layer, and the insulating layer is located between the second polarizing unit and the light-emitting element.

4. The transparent display device as claimed in claim 3, wherein the liquid crystal module is located between the first polarizing unit and the self-emissive display module, and the liquid crystal module and the self-emissive display module share the substrate.

5. The transparent display device as claimed in claim 1 further includes a bonding layer located between the self-emissive display module and the liquid crystal module, wherein the liquid crystal module is located between the bonding layer and the first polarizing unit.

6. The transparent display device as claimed in claim 8 further includes a shielding layer located between the bonding layer and the liquid crystal module.

7. The transparent display device as claimed in claim 1 further includes a shielding electrode located between the self-emissive display module and the liquid crystal module, wherein the liquid crystal module is located between the second polarizing unit and the self-emissive display module.

8. The transparent display device as claimed in claim 1, wherein the phase difference between the first elliptically polarized light exiting the liquid crystal module and the phase difference between the second elliptically polarized light entering the transmissive region of the self-emissive display module is less than or equal to 10 degrees.

9. The transparent display device as claimed in claim 8, wherein the intensity attenuation of the first elliptically polarized light converted to the second elliptically polarized light is less than or equal to 10%.

10. The transparent display device as claimed in claim 1, wherein the transmittance of ambient light through the transparent display device is proportional to the operating voltage of the liquid crystal module.

11. A vehicle display device, comprising: The first polarizing unit includes a first linear polarizer and a quarter-wavelength compensation plate, and is disposed on the vehicle body; A second polarizing unit, overlapping the first polarizing unit, and including a second linear polarizer and a three-quarter wavelength compensation plate; a self-emissive display module, located between the first polarizing unit and the second polarizing unit; and a liquid crystal module, located between the first polarizing unit and the self-emissive display module or between the second polarizing unit and the self-emissive display module, wherein both the self-emissive display module and the liquid crystal module are located between the quarter wavelength compensation plate and the three-quarter wavelength compensation plate, wherein ambient light enters the first linear polarizer and becomes first linearly polarized light and leaves the first linear polarizer, then enters the quarter wavelength compensation plate as second linearly polarized light and becomes first circularly polarized light and leaves the first polarizing unit, then enters the liquid crystal module as second circularly polarized light and is modulated into first elliptically polarized light and leaves the liquid crystal module, then passes through the self-emissive display module as third elliptically polarized light and leaves the self-emissive display module, then passes through the three-quarter wavelength compensation plate as fourth elliptically polarized light and leaves the three-quarter wavelength compensation plate. Then, the sixth elliptically polarized light passes through the second linear polarizer and becomes the third linearly polarized light before leaving the second polarizing unit.

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