Patent Application
20100053062
The present invention relates to an LCD device and a method thereof, particularly to an LCD device and a method thereof, which intelligently enable a monochromatic LCD panel and a single-level driver to present multicolor effect without using a color filter.
The conventional LCD (Liquid Crystal Display) device needs a color filter to generate colors. The white light generated by a backlight device passes through the R/G/B (red/green/blue) subpixels to generate the three primary colors. Then, the three primary colors are mixed by different ratios in different pixels to present various colors.
As white light passes through the RGB subpixels of a color filter, most of the backlight is filtered out. Therefore, the prior art has low backlight efficiency, low color saturation and high cost.
The primary objective of the present invention is to provide a filter-free LCD (Liquid Crystal Display) device and a method thereof, which has a higher light efficiency and a lower price.
The device of the present invention comprises a monochromatic LCD panel, a single-level driver, a multicolor backlight modulation device, and a multicolor modulation backlight unit. The monochromatic LCD panel has a common electrode and a plurality of segment electrodes, and the common electrode and the segment electrodes are respectively arranged on an upper layer and a lower layer. The multicolor modulation backlight unit has a backlight source emitting at least two different-color backlights. The single-level driver is programmed to generate a plurality of segment voltage signals. The multicolor backlight modulation device receives the segment voltage signals and modulates a portion of the segment voltage signals to generate a common voltage signal and a plurality of synchronous color-separation backlight driving signals, wherein the number of the color-separation backlight driving signals is equal to the number of the backlights. The color-separation backlight driving signals are used to drive the multicolor modulation backlight unit, and the common voltage signal and the segment voltage signals are respectively input to the common electrode and the segment electrodes.
Then, the common voltage signal cooperates with the segment voltage signals to form voltage differences. The voltage differences drive a mono-pixel to turn on or turn off in a time-division mode. At the same time, the color-separation backlight driving signals drive the backlight source to turn on or turn off at least two different-color backlights. The time-division different-color backlights are accumulated by vision persistence to present a multicolor effect on the mono-pixel.
Below, the technical contents of the present invention are described in detail in cooperation with the drawings.
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Below is described the driving method of the present invention. Firstly is prepared a monochromatic LCD panel 10, a single-level driver 20, a multicolor backlight modulation device 30, and a multicolor modulation backlight unit 40.
Next, the single-level driver 20 sequentially generates a plurality of segment voltage signals according to the timing, wherein the segment voltage signals are programmable with software.
Next, the segment voltage signals are input to the multicolor backlight modulation device 30 and modulated therein to form a common voltage signal 31 and a plurality of synchronous color-separation backlight driving signals 32, 33 and 34, wherein the number of the color-separation backlight driving signals is equal to the number of the backlight sources 41 (There are three colors in the drawing).
Next, the color-separation backlight driving signals 32, 33 and 34 are input to the multicolor modulation backlight unit 40. The common voltage signal 31 and the segment voltage signals are respectively input to the common electrode 11 and the segment electrodes 12.
Then, the common voltage signals 31 cooperate with the segment voltage signals to form voltage differences. The voltage differences turn on or turn off a mono-pixel 13 in a time-division mode. At the same time, the backlight source 41 generates backlights of different colors. The time-division different-color backlights are accumulated by vision persistence to present a multicolor effect on the mono-pixel 13.
It should be mentioned particularly: The color-separation backlight driving signals 32, 33 and 34 enable the mono-pixel 13 to emit different colors at different time intervals, and the time intervals of the color-separation backlight driving signals 32, 33 and 34 can be programmably varied. Therefore, the ratio of the time intervals of RGB backlights corresponding to the color-separation backlight driving signals 32, 33 and 34 can also be programmably varied. Thus, the resultant color of the mono-pixel 13 is also programmable.
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In the present invention, the segment voltage signals are programmed to control the ratio of RGB backlights generated by the multicolor modulation backlight unit 40. Therefore, the present invention can be programmed with software to expand its applications, such as a red backlight for alarm, or diversified backlights to promote recognition.
