Mirrored LCD display

• US 20060202942A1
• Filed: 03/09/2005
• Published: 09/14/2006
• Est. Priority Date: 03/09/2005
• Status: Abandoned Application

• Current Assignee: VIA Technologies Incorporated (VIA Technologies)
• Original Assignee: VIA Technologies Incorporated (VIA Technologies)
• Inventors: Fong, David
• Application Number:
  US11/075,924
• Publication Number:
  US 20060202942A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133557 Half-mirrors
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H04M 1/0202 Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03

Abstract

A mirrored liquid crystal display (LCD) is provided. One embodiment, among others, comprises a liquid crystal display (LCD); and logic for controlling the LCD to selectively operate in one of two alternative states. The two states include a first state in which the LCD operates in a conventional manner to display visible data to a user, and a second state in which the LCD effectively functions as a mirror.

Claims

1. A wireless telephone comprising:

communication logic configured to send and receive signals from a base station over a wireless channel, the base station in communication with a telephone network;

a mirrored liquid crystal display comprising;

a liquid crystal module;

a half-mirror layer, which is partially reflective and partially transmissive, affixed to one surface of the liquid crystal module;

a backlight producing light directed at an opposite surface of the liquid crystal module,

wherein the intensity of light produced by the backlight is matched to the reflective and transmissive characteristics of the half-mirror layer such that when the light output is at a minimum, the half-mirror layer is substantially reflective and the liquid crystal module is substantially invisible, and when the light output is at a maximum, the half-mirror layer is substantially transmissive and the liquid crystal module is substantially visible; and

input logic configured to receive input from the user to control the communication logic and to control the intensity of the light produced by the backlight.

2. The apparatus of claim 1, wherein the half-mirror layer comprises:

a reflective surface with reflectance value R_m; and

a transparent surface with reflectance value R_t,

wherein the half-mirror layer has a light transmittance value T, and wherein T, R_m and R_t are chosen so that the ratio I_t;

I_m is at least 5, wherein I_m is the intensity of an image reflected off the half-mirror layer and I_t is the intensity of light exiting the LCD display.

3. The apparatus of claim 1, wherein the half-mirror layer comprises:

a reflective surface with reflectance value R_m; and

a transparent surface with reflectance value R_t,

wherein the half-mirror layer has a light transmittance value T, and wherein T, R_m and R_t are chosen so that the ratio I_t;

I_m is at least 5, wherein I_m is the intensity of an image reflected off the half-mirror layer and I_t is the intensity of light exiting the LCD display.

4. The apparatus of claim 1, wherein the liquid crystal module comprises:

a first and second transparent layer facing each other;

a first electrode affixed to inner surface of first transparent layer;

a second transparent layer affixed to inner surface of second transparent layer;

a liquid crystal material sealed between the first and second transparent layers;

a first polarizing layer affixed to outer surface of first transparent layer having a first polarization axis; and

a second polarizing layer affixed to outer surface of second transparent layer having a second polarization axis different than the first polarization axis.

5. The apparatus of claim 3, wherein the first and second electrodes are transparent.

6. The apparatus of claim 3, wherein the liquid crystal material is chosen from the group of twisted nematic or super-twisted nematic.

7. The apparatus of claim 3, wherein the second polarization axis is rotated 90°

from the first polarization axis.

8. The apparatus of claim 1, wherein the LCD module further comprises a color filter.

9. The apparatus of claim 1, wherein the input logic is further configured to enable and disable the backlight. A wireless telephone comprising:

communication logic configure to send and receive signals from a base station over a wireless channel, the base station in communication with a telephone network;

a mirrored liquid crystal display comprising;

an electro-optical means;

a means for partially reflecting and partially transmitting light rays, affixed to one surface of the electro-optical means;

a means for producing light directed at an opposite surface of the electro-optical optical means

wherein the intensity of light produced by the backlight is matched to the reflective and transmissive characteristics of the means for partially reflecting and partially transmitting, such that when the light output is at a minimum, the means for partially reflecting and partially transmitting is substantially reflective and the electro-optical means is substantially invisible, and when the light output is at a maximum, the means for partially reflecting and partially transmitting is substantially transmissive and the electro-optical means is substantially visible; and

input logic configured to receive input from the user to control the communication logic and to control the intensity of the light produced by the means for producing light.

10. The apparatus of claim 10, wherein the means for partially reflecting and partially transmitting comprises:

a reflective surface with reflectance value R_m; and

a transparent surface with reflectance value R_t,

wherein the half-mirror layer has a light transmittance value T, and wherein T, R_m and R_t are chosen so that the ratio I_t;

I_m is at least 5, wherein I_m is the intensity of an image reflected off the half-mirror layer and I_t is the intensity of light exiting the LCD display.

11. The apparatus of claim 10, wherein the electro-optical means comprises an LCD module.

12. The apparatus of claim 10, wherein the electro-optical means comprises:

a first and second transparent layer facing each other;

a first electrode affixed to inner surface of first transparent layer;

a second transparent layer affixed to inner surface of second transparent layer;

a liquid crystal material sealed between the first and second transparent layers;

a first polarizing layer affixed to outer surface of first transparent layer having a first polarization axis; and

a second polarizing layer affixed to outer surface of second transparent layer having a second polarization axis different than the first polarization axis.

15. The apparatus of claim 11, wherein the LCD module further comprises a color filter.

16. The apparatus of claim 11, wherein the input logic is further configured to enable and disable the backlight. A telephone comprising:

a liquid crystal display (LCD); and

logic for controlling the LCD to selectively operate in one of two alternative states, including a first state in which the LCD operates in a conventional manner to display visible data to a user, and a second state in which the LCD effectively functions as a mirror.

13. The apparatus of claim 13, wherein the first and second electrodes are transparent.

14. The apparatus of claim 13, wherein the second polarization axis is rotated 90°

from the first polarization axis.

18. A telephone comprising:

a liquid crystal display (LCD); and

logic for controlling the LCD to selectively function as a mirror.

17. The telephone of claim 18 further including a reflective coating coupled to a rear side of the LCD, and wherein the LCD further includes a layer interposed between the reflective coating and the outside of the LCD, whereby when the LCD is configured in the second state the transmissive characteristics of the layer are controlled so an outside image is reflected from the reflective layer.

19. The telephone of claim 18 filer including a reflective coating coupled to a rear side of the LCD, and wherein the LCD further includes a layer interposed between the reflective coating and the outside of the LCD, whereby when the LCD is configured in the second state the transmissive characteristics of the layer are controlled so an outside image is reflected from the reflective layer.

20. A telephone comprising:

a liquid crystal display (LCD); and

logic for controlling the LCD to selectively function as a mirror.