BACKGROUND

Technical Field

The present invention relates to a display device. Specifically, the present invention relates to a display device having a stacked structure including a phase retardation layer, a polymerized cholesteric material layer (PCM layer), and a polarizer.

Related Art

Environmental light is often reflected by a display device when the environmental light is incident on the display device. However, such a phenomenon may interfere with content displayed by the display device, and is adverse to display. In addition, in recent years, to improve aesthetic appeal or increase variability, more and more display devices are designed with special appearances. For example, in some display devices, a pattern or a texture may be provided in at least one layer of a stacked structure. As stated above, due to reflection of environmental light, such appearance designs may be unexpectedly perceived by a user when the display device is displaying, resulting in degradation of viewing experience of the user. Therefore, it is necessary to develop a display device that can reduce or avoid environmental light reflection in a display state, and that can normally present a preset appearance in a non-display state.

SUMMARY

Technical Means for Resolving Problems

To resolve the foregoing problems, an embodiment of the present invention provides a display device including a display panel having a display surface, a polarizer disposed on the display surface, a first phase retardation layer disposed on one side of the polarizer opposite to the display surface, a PCM layer disposed on one side of the first phase retardation layer opposite to the display surface, a second phase retardation layer disposed on one side of the PCM layer opposite to the display surface, and a switchable polarizer disposed on one side of the second phase retardation layer opposite to the display surface. The first phase retardation layer is configured to allow linearly polarized light passing therethrough to have phase retardation, so as to generate circularly polarized light or elliptically polarized light having preset optical activity (optical rotation). The PCM layer is configured to allow the circularly polarized light or elliptically polarized light having the preset optical activity to pass. The first phase retardation layer has a first optical axis, the second phase retardation layer has a second optical axis, and the second optical axis is orthogonal to the first optical axis. The polarity of the switchable polarizer can be turned on or off according to a display state or a non-display state of the display panel, respectively. The polarizer has a first absorption axis, and the switchable polarizer, when having the polarity, has a second absorption axis being in the same direction as the first absorption axis.

Benefits Compared to the Prior Art

According to the display device provided in the embodiments of the present invention, negative impact brought by that environmental light is reflected by the display device may be alleviated or avoided in a display state while maintaining presentation of a preset appearance, such as a texture or a pattern, of the display device in a non-display state. Therefore, according to the display device of the present invention, an appearance of the display device may be hidden in the display state, thereby improving display quality and user experience of the display device.

