Patent Application
20140119053
The present invention relates to displays, in particular to a backlight module and a display device.
Liquid-crystal display (LCD) devices have become the mainstream display device and are mainly applied to LCDs for computers, large-scale LCD TVs and the like. As LCD panels per se do not emit light spontaneously, the display effect can only be achieved when the LCD panels are used together with backlights. In the early stage of the development of the LCD devices, the mainstream backlights adopt cold cathode fluorescent lamps (CCFL). But CCFLs have insufficient mechanical strength and poor color reproducibility, and do not meet the environmental requirements as they contain mercury. In recent years, CCFL backlights have been gradually replaced by light-emitting diode (LED) backlights. As compared with CCFL backlights, LED backlights have the advantages of not containing toxic substances and having high mechanical strength, long service life and the like. As the LED backlights have so many advantages, most display devices used currently adopt LEDs as backlight systems.
Although LED backlights have the above advantages, the color gamut range of the LED backlights is only 70 to 80 percent of the standard color gamut. There is still much room for improvement in color gamut range.
According to embodiments of the present invention, a backlight module is provided, which comprises a light guide plate and a light bar disposed on the light guide plate, the light bar being provided with white light sources, wherein the light bar is further provided with monochromatic light sources having at least one color of N primitive colors, wherein N≧3.
Preferably, the monochromic light sources and the white light sources on the light bar are arranged at intervals.
Preferably, the monochromic light sources are monochromic light sources having one color of the N primitive colors.
For example, the monochromic light sources are monochromic light sources having one color of three primitive colors.
Preferably, the monochromic light sources are red light sources.
Preferably, both the monochromic light sources and the white light sources are light-emitting diodes.
According to embodiments of the present invention, a display device is also provided, which comprises a backlight module, wherein the backlight module includes a light guide plate and a light bar disposed on the light guide plate; and the light bar is provided with white light sources and monochromic light sources having at least one color of N primitive colors, wherein N≧3.
Preferably, the monochromic light sources are monochromic light sources having one color of the N primitive colors; and the width of sub-pixels, whose color is the same as that of the monochromic light sources, on the display device is less than that of sub-pixels corresponding to other colors.
The monochromic light sources are for example monochromic light sources having one color of three primitive colors; and the width of sub-pixels, whose color is the same as that of the monochromic light sources, on the display device is less than that of sub-pixels corresponding to the other two colors.
Preferably, the monochromic light sources are red light sources; and the width of red sub-pixels on the display device is less than those of green sub-pixels and blue sub-pixels.
Preferably, the monochromic light sources are red light sources; the width of red sub-pixels on the display device is less than that of green sub-pixels; and the width of the green sub-pixels is less than that of blue sub-pixels.
Preferably, a ratio of the width of the red sub-pixels to that of the green sub-pixels to that of the blue sub-pixels on the display device is 0.8:0.9:1.
In order to illustrate the technical solution of the embodiment of present invention more clearly, a simply introduction about the drawings of the embodiments will be made in the following, and obviously, the drawings described later relate to only some embodiments of the present invention, rather than limitation to the present invention.
Further description will be given below to the preferred embodiments of the present invention with reference to the accompanying drawings and the embodiments. The following embodiments are only used for illustrating the present invention and not intended to limit the scope of the present invention.
As illustrated in
Theoretically, the monochromic light sources 12 on the LED bars may have any monochromic colors at the same time. For instance, red light sources and green light sources are provided at the same time. However, in order to avoid color distortion caused by the mixing of a plurality of colors, the monochromic light sources 12 on the LED bars preferably have the same color. The experimental result shows that red is more obvious than blue or green in the aspect of improving the color gamut. Therefore, preferably, the monochromic light sources 12 are red light sources, for instance, LEDs emitting red light.
According to embodiments of the present invention, a display device is further provided which comprises the above-mentioned backlight module. By adoption of the backlight module, the color range which can be displayed by the display device can be widened, that is, the display color gamut can be improved.
Respective sub-pixels on a color filter substrate and an array substrate of the traditional thin-film transistor liquid crystal display (TFT-LCD) have the same sizes as each other. When the monochromic light sources are additionally arranged in the backlight module, the display effect of sub-pixels whose color is the same as that of the monochromic light sources will be enhanced, and thus the phenomenon of color distortion will occur (for instance, the whole display screen is reddish).
In order to avoid the phenomenon of color distortion, the monochromic light sources are monochromic light sources having one color of the N primitive colors, namely the monochromic light sources 12 on the LED bars have the same primitive color. Meanwhile, the sizes of sub-pixels on the display device are changed, so that the area of sub-pixels, whose color is the same as that of the monochromic light sources, on the display device can be less than that of sub-pixels corresponding to other colors. For instance, the width of the sub-pixels, whose color is the same as that of the monochromic light sources, on the display device is less than that of the sub-pixels corresponding to other colors.
Description will be given below by taking an RGB display device as an example.
The monochromic light sources are monochromic light sources having one color of three primitive colors, for instance, red light sources. The width of sub-pixels, whose color is the same as that of the red light sources, on the display device is less than that of sub-pixels corresponding to green and blue. As the color value of green is close to that of red, and red light has a relatively large influence on green light, the width of red sub-pixels is preferably less than that of green sub-pixels, and the width of the green sub-pixels is less than that of blue sub-pixels. The ratio of the width of the red sub-pixels to that of the green sub-pixels to that of the blue sub-pixels can be 0.8:0.9:1.
The color range which can be displayed by the display device is traditionally defined as a triangular area encircled by R, G and B color coordinates. The larger the area of the triangle, the wider the color range which can be displayed by the display device. As illustrated in
The display device according to the present invention is not limited to the RGB display device, and can be display devices having other color modes, for instance, CMYK or other self-defined color modes. The difference is that sub-pixel structures on a color filter substrate and an array substrate are accordingly sub-pixel structures of other colors.
The display device according to embodiments of the present invention can be an LCD panel, electronic paper, an organic light-emitting diode (OLED) panel, an LCD TV, an LCD, a digital picture frame, a mobile phone, a tablet PC or any other products or components having the display function.
According to the embodiments of the present invention, the color gamut range of the backlight display system can be improved by incorporating the monochromic light sources having one color of the N primitive colors (for instance, three primitive colors RGB, four primitive colors CMYK or other self-defined color systems) into the LED bars. Moreover, in order to be used together with the backlight, in the display device according to the embodiment of the present invention, the sizes of the sub-pixels are changed so that the display device can not only improve the color gamut range and increase the color reproducibility but also avoid the phenomenon of color distortion.
The foregoing embodiments are provided only for illustrating the present invention and not intended to limit the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201210425962.2 | Oct 2012 | CN | national |
