A terminal, comprising: a display component, comprising a display screen and a panel, wherein the panel comprises: a first conductive layer that is transparent, a second conductive layer that is transparent, and a variable-refractive-index layer between the first conductive layer and the second conductive layer, wherein a refractive index of the variable-refractive-index layer varies in response to a change of a voltage applied between the first conductive layer and the second conductive layer, the panel is located on an outer surface of the display screen, the display component has a view angle varying with a refractive index of the variable-refractive-index layer of the panel; and a processing module, connected with the display component and configured to: in response to a display mode to be activated being a first display mode, apply a first voltage between the first conductive layer and the second conductive layer of the panel in the display component, to enable the variable-refractive-index layer between the first conductive layer and the second conductive layer to have a first refractive index, wherein the display component has a first view angle when the variable-refractive-index layer has the first refractive index, wherein the variable-refractive-index layer comprises: at least one optical transmission structure between the first conductive layer and the second conductive layer, wherein the optical transmission structure comprises a core and a cladding attached to an outer surface of the core, and the core has a refractive index greater than a refractive index of the cladding; characterised in that Z the refractive index of the core varies in response to the change of the voltage applied between the first conductive layer and the second conductive layer, such that with increasing voltage applied the refractive index increases. a display component, comprising a display screen and a panel, wherein the panel comprises: a first conductive layer that is transparent, a second conductive layer that is transparent, and a variable-refractive-index layer between the first conductive layer and the second conductive layer, wherein a refractive index of the variable-refractive-index layer varies in response to a change of a voltage applied between the first conductive layer and the second conductive layer, the panel is located on an outer surface of the display screen, the display component has a view angle varying with a refractive index of the variable-refractive-index layer of the panel; and a processing module, connected with the display component and configured to: in response to a display mode to be activated being a first display mode, apply a first voltage between the first conductive layer and the second conductive layer of the panel in the display component, to enable the variable-refractive-index layer between the first conductive layer and the second conductive layer to have a first refractive index, wherein the display component has a first view angle when the variable-refractive-index layer has the first refractive index, wherein the variable-refractive-index layer comprises: at least one optical transmission structure between the first conductive layer and the second conductive layer, wherein the optical transmission structure comprises a core and a cladding attached to an outer surface of the core, and the core has a refractive index greater than a refractive index of the cladding; characterised in that Z the refractive index of the core varies in response to the change of the voltage applied between the first conductive layer and the second conductive layer, such that with increasing voltage applied the refractive index increases. a first conductive layer that is transparent, a second conductive layer that is transparent, and a variable-refractive-index layer between the first conductive layer and the second conductive layer, wherein a refractive index of the variable-refractive-index layer varies in response to a change of a voltage applied between the first conductive layer and the second conductive layer, the panel is located on an outer surface of the display screen, the display component has a view angle varying with a refractive index of the variable-refractive-index layer of the panel; and a processing module, connected with the display component and configured to: in response to a display mode to be activated being a first display mode, apply a first voltage between the first conductive layer and the second conductive layer of the panel in the display component, to enable the variable-refractive-index layer between the first conductive layer and the second conductive layer to have a first refractive index, wherein the display component has a first view angle when the variable-refractive-index layer has the first refractive index, wherein the variable-refractive-index layer comprises: at least one optical transmission structure between the first conductive layer and the second conductive layer, wherein the optical transmission structure comprises a core and a cladding attached to an outer surface of the core, and the core has a refractive index greater than a refractive index of the cladding; characterised in that Z the refractive index of the core varies in response to the change of the voltage applied between the first conductive layer and the second conductive layer, such that with increasing voltage applied the refractive index increases.