Bistable liquid crystal display and writing device with high brightness and contrast
First Claim
1. A liquid crystal device, comprising:
- a first conductive layer;
a second conductive layer; and
a liquid crystal film between the first and second conductive layers, the liquid crystal film including a first liquid crystal layer, a second liquid crystal layer and a middle polymer layer between the first and second liquid crystal layers;
wherein the first and second liquid crystal layers are configured to switch from a light scattering state to a light reflective state to display content, and the first and second liquid crystal layers are configured to switch from the light reflective state to the light scattering state to erase the content;
wherein during operation a portion of the first liquid crystal layer and a portion of the second liquid crystal layer are configured to switch from the light scattering state to the light reflective state to display the content in response to a mechanical pressure applied to a surface of the liquid crystal device at a place where the content is to be displayed without an electric field applied across the first and second liquid crystal layers.
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Accused Products
Abstract
Embodiments are disclosed for a liquid crystal display and writing device that has a high brightness and a high contrast ratio. The device includes a first two conductive layers and a liquid crystal film between the conductive layers. The liquid crystal film includes a first liquid crystal layer, a second liquid crystal layer and a middle polymer layer between the first and second liquid crystal layers. The first and second liquid crystal layers are configured to switch from a light scattering state to a light reflective state to display content. The first and second liquid crystal layers are further configured to switch from the light reflective state to the light scattering state to erase the content.
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Citations
22 Claims
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1. A liquid crystal device, comprising:
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a first conductive layer; a second conductive layer; and a liquid crystal film between the first and second conductive layers, the liquid crystal film including a first liquid crystal layer, a second liquid crystal layer and a middle polymer layer between the first and second liquid crystal layers; wherein the first and second liquid crystal layers are configured to switch from a light scattering state to a light reflective state to display content, and the first and second liquid crystal layers are configured to switch from the light reflective state to the light scattering state to erase the content; wherein during operation a portion of the first liquid crystal layer and a portion of the second liquid crystal layer are configured to switch from the light scattering state to the light reflective state to display the content in response to a mechanical pressure applied to a surface of the liquid crystal device at a place where the content is to be displayed without an electric field applied across the first and second liquid crystal layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for manufacturing a liquid crystal device, comprising:
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producing a liquid crystal film including a polymer layer and at least one liquid crystal layer; curing the polymer layer such that polymers of the polymer layer and liquid crystal molecules of the liquid crystal layer are separated such that during operation at least a portion of the liquid crystal layer switches from a light scattering state to a light reflective state to display a content in response to a mechanical pressure applied at a place where the content is to be displayed without an electric field applied across the liquid crystal layer; and attaching a first conductive layer on top of the liquid crystal film and a second conductive layer on bottom of the liquid crystal film. - View Dependent Claims (14, 15, 16)
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17. A method for displaying content on a liquid crystal writing device, comprising:
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detecting a mechanical pressure applied at a place on a surface of the liquid crystal writing device; in response to the mechanical pressure, switching at least a portion of a liquid crystal film from a light scattering state to a light reflective state to display content at the place where the mechanical pressure is applied without an electric field applied across the liquid crystal film, wherein the liquid crystal film including a first liquid crystal layer, a second liquid crystal layer and a middle polymer layer between the first and second liquid crystal layers; and applying a voltage to conductive layers on and beneath the liquid crystal film to switch liquid crystal film from the light reflective light scattering state to the light scattering state. - View Dependent Claims (18, 19)
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20. A liquid crystal device, comprising:
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a first conductive layer; a second conductive layer; and a liquid crystal film between the first and second conductive layers, the liquid crystal film including a liquid crystal layer and a polymer layer; wherein the liquid crystal layer is configured to switch from a light scattering state to a light reflective state to display content, and the liquid crystal layer is configured to switch from the light reflective state to the light scattering state to erase the content; wherein a portion of the liquid crystal layer is configured to switch from the light scattering state to the light reflective state to display the content in response to a mechanical pressure applied to a surface of the liquid crystal device at a place where the content is to be displayed without an electric field applied across the liquid crystal layer. - View Dependent Claims (21, 22)
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Specification