Portable microdisplay system

• US 20070018919A1
• Filed: 06/26/2006
• Published: 01/25/2007
• Est. Priority Date: 12/14/1998
• Status: Abandoned Application

• Current Assignee: Alan Richard, Bor-Yeu Tsaur, David Ellertson, Duy-Phach Vu, Frederick Herrmann, Jason Lo, John Fan, Kuojinng Tsai, Matthew Zavracky, Rodney Bumgardner, Ronald Gale, Stephen Pombo, Wen-Foo Chern
• Original Assignee: Alan Richard, Bor-Yeu Tsaur, David Ellertson, Duy-Phach Vu, Frederick Herrmann, Jason Lo, John Fan, Kuojinng Tsai, Matthew Zavracky, Rodney Bumgardner, Ronald Gale, Stephen Pombo, Wen-Foo Chern
• Inventors: Tsaur, Bor-Yeu, Gale, Ronald, Pombo, Stephen, Zavracky, Matthew, Richard, Alan, Vu, Duy-Phach, Fan, John, Lo, Jason, Bumgardner, Rodney, Ellertson, David, Herrmann, Frederick, Tsai, Kuojinng, Chern, Wen-Foo
• Application Number:
  US11/475,567
• Publication Number:
  US 20070018919A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0281 Arrangement of scan or data electrode driver circuits at the periphery of a panel not inherent to a split matrix structure
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/0606 Manual adjustment
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3406 : Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 : Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3614 : Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 : Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3659 : the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
• CPC Class Codes: G09G 3/3677 : suitable for active matrices only
• CPC Class Codes: G09G 3/3688 : suitable for active matrices only
• CPC Class Codes: G09G 5/008 : Clock recovery
• CPC Class Codes: G09G 5/399 : using two or more bit-mapped memories, the operations of which are switched in time, e.g. ping-pong buffers

Abstract

An active matrix color crystal display has an active matrix circuit, a counterelectrode panel and an interposed layer of liquid crystal. The active matrix display is located in a portable microdisplay system. The image is written to the the display therein causing the liquid crystal to move to a specific image position. A light source is flashed to illuminate the display. The pixel electrodes are set to a specific value to cause the liquid crystal to move towards a desired position. The process of writing, flashing, and setting the electrode intensity value to reorient the liquid crystal to produce an image is repeated. Portable system can include a digital camera, cellular telephone, camcorder, heads up display, instant print camera, pager,

Claims

1. A microdisplay system comprising:

an active matrix liquid crystal display including an array of pixel electrodes;

a display circuit having a pair of memory elements and at least one controller that controls writing and reading from the memory elements such that a first memory element is being written while the data from a second memory element is sent to the display;

a light source that illuminates the array of pixel electrodes; and

a lens that magnifies an image formed on the active matrix liquid crystal display.

2. The microdisplay system of claim 1, further comprising a multeplixer for directing the signal and output process for inverting selected video signals.

3. The microdisplay system of claim 1, further comprising at least one scaling circuit for interpolating image data from a certain number of pixel data to a preferred number of pixel data for the display.

4. The microdisplay system of claim 3, wherein the scaling is of horizontal lines of video data.

5. The microdisplay system of claim 3, wherein the scaling if of vertical columns of video data and further comprising a buffer for storing data.

6. The microdisplay system of claim 3, further comprising a gamma correction circuit for converting an input signal to an output signal which results in proper intensity on the display.

7. The microdisplay system of claim 6, wherein the gamma correction circuit has

8. The microdisplay system of claim 6, wherein the gamma correction circuit has a look up table for converting an input signal to an output signal which results in proper intensity on the display

9. The microdisplay system of claim 8, further comprising circuitry for setting voltage of the pixel electrodes to the voltage of the counterelectrode to initialize the display at each subframe and a circuit for switching the voltage of the counterelectrode.

10. The microdisplay system of claim 8, further comprising reordering the values of the data for increase efficient use of memory.

11. The microdisplay system of claim 1, further comprising circuitry for setting voltage of the pixel electrodes to the voltage of the counterelectrode to initialize the display at each subframe.

12. The microdisplay system of claim 11, further comprising a circuit for switching the voltage of the counterelectrode.

13. The microdisplay system of claim 12, further comprising a gamma correction circuit having a look up table for converting an input signal to an output signal which results in proper intensity on the display.

14. The microdisplay system of claim 13, further comprising reordering the values of the data for increase efficient use of memory.

15. The microdisplay system of claim 1, further comprising at least one scaling circuit for interpolating image data from a certain number of pixel data to a preferred number of pixel data for the display.

16. The microdisplay system of claim 11, further comprising a digital table for converting an input video signal to a corrected output value to achieve proper twist of the liquid crystal to have proper intensity.

17. The microdisplay system of claim 11, further comprising a pair of switching circuits for pseudo-random one of a plurality of signals through one of a plurality of amplifiers and to the display to balance the relative strength of the plurality of signals.

18. A microdisplay system comprising:

an active matrix liquid crystal display including an array of pixel electrodes and having an active area of less than 200 mm²;

a display circuit having a pair of memory elements and at least one controller that controls writing and reading from the memory elements such that a first memory element is being written while the data from a second memory element is sent to the display;

a light source that illuminates the array of pixel electrodes; and

a lens that magnifies an image formed on the active matrix liquid crystal display.

19. The microdisplay system of claim 18, further comprising a multeplixer for directing the signal and output process for inverting selected video signals.

20. The microdisplay system of claim 18, further comprising at least one scaling circuit for interpolating image data from a certain number of pixel data to a preferred number of pixel data for the display.