Transmissive LCD display illumination with deposited light-generating sources
Disclosed herein are technologies related to the use of deposited light-generating sources as the backlight for transmissive illumination of the pixel structures of a transmissive display. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
1. A liquid crystal display (LCD) system comprising:
an array of LCD pixel structures, each LCD pixel structure having:
a liquid-crystal shutter sandwiched between a rear polarized panel and a front polarized panel, and
electronics controls configured to operate on the liquid-crystal shutter to modulate light passing through the respective LCD pixel structure;
a matrix of pixel backlights placed directly on the rear polarized panel disposed behind the array of LCD pixel structures, each pixel backlight being associated with an LCD pixel structure, each pixel backlight being independently addressable from other pixel backlights of the matrix, each pixel backlight including at least one unpackaged light-emitting diode (LED); and
a backlight control subsystem configured to modulate intensity of light generated by each pixel backlight of the matrix.
2. The LCD system according to claim 1 , wherein each LCD pixel structure includes three or more different colored subpixel structures.
3. The LCD system according to claim 1 , wherein the backlight control subsystem is further configured to turn off light generated by a pixel backlight associated with a black LCD pixel structure.
4. The LCD system according to claim 1 , wherein the backlight control subsystem is further configured to turn off light generated by a pixel backlight associated with a shuttered LCD pixel structure.
5. The LCD system according to claim 1 , wherein the backlight control subsystem is further configured to turn off light generated by a pixel backlight associated with an LCD pixel structure with a liquid-crystal shutter that is closed down.
6. The LCD system according to claim 1 , wherein the backlight control subsystem is further configured to turn off light generated by a particular pixel backlight while generating light by other pixel backlights that are physically adjacent thereto.
7. The LCD system according to claim 1 , wherein each pixel backlight includes a plurality of unpackaged LEDs.
8. The LCD system according to claim 1 , wherein each pixel backlight includes a plurality of unpackaged LEDs, a cross-section of each of the unpackaged LEDs having a maximum dimension of 3 to 50 microns.
9. The LCD system according to claim 1 , wherein a cross-section of the at least one unpackaged LED has a maximum dimension of 3 to 50 microns, and
wherein the at least one unpackaged LED is precisely placed on the rear polarized panel.
10. A method facilitating local dimming, the method comprising:
obtaining a video signal to generate an image on a liquid-crystal display (LCD) screen, the LCD screen including:
an array of LCD pixel structures, each LCD pixel structure having:
a liquid-crystal shutter sandwiched between a rear polarized panel and a front polarized panel, and
electronics controls configured to operate on the liquid-crystal shutter to modulate light passing through the respective LCD pixel structure,
a matrix of pixel backlights disposed directly on the rear polarized panel, each pixel backlight being associated with an LCD pixel structure, each pixel backlight being independently addressable from other pixel backlights of the matrix, and each pixel backlight including at least one unpackaged light-emitting diode (LED), and
a backlight control subsystem configured to modulate intensity of light generated by each pixel backlight of the matrix; and
generating the image on the LCD screen based upon the video signal, the generating including:
determining whether a particular pixel should be black based upon the video signal, and
turning off, in response to a determination that the particular pixel should be black, a pixel backlight that is associated with the particular pixel.
11. The method according to claim 10 , wherein the determining is based, at least in part, upon a portion of the video signal that directs modulation of the liquid-crystal shutter of a corresponding LCD pixel structure of the particular pixel.
12. The method according to claim 10 , wherein the determining is based solely upon a portion of the video signal that directs modulation of the liquid-crystal shutter of a corresponding LCD pixel structure of the particular pixel.
13. The method according to claim 10 , further comprising precisely placing the at least one unpackaged LED on the rear polarized panel,
wherein a cross-section of the at least one unpackaged LED has a maximum dimension of 3 to 50 microns.
14. A liquid crystal display (LCD) system comprising:
an array of LCD pixel structures, each LCD pixel structure associated with a pixel of the system, and each LCD pixel structure having:
a liquid-crystal shutter sandwiched between a rear polarized panel and a front polarized panel, and
electronics controls configured to operate on the liquid-crystal shutter to modulate light passing through the respective LCD pixel structure; and
a matrix of pixel backlights disposed directly on the rear polarized panel to provide illumination for the array of LCD pixel structures, each pixel backlight including at least one unpackaged light-emitting diode (LED).
15. The LCD system according to claim 14 , wherein each pixel backlight is independently addressable from other pixel backlights of the matrix.
16. The LCD system according to claim 14 , further comprising a backlight control subsystem configured to modulate intensity of light generated by each pixel backlight of the matrix.
17. The LCD system according to claim 16 , wherein the backlight control subsystem is further configured to turn off light generated by a particular pixel backlight while generating light by other pixel backlights that are physically adjacent thereto.
18. The LCD system according to claim 14 , wherein dimensions of the at least one unpackaged LED are not greater than 1.0 mm long by 0.8 mm wide and 0.2 mm thick.