Backlight module of a liquid crystal display, display device, method of improving color gamut of a display device
First Claim
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1. A backlight module of a liquid crystal display, comprising:
- a housing;
a light source positioned in the housing for emitting a light comprising a red light, a green light and a blue light; and
a cut filter positioned over the light source to filter off a part of the light comprising an overlap of at least two of the red light, the green light, and the blue light, wherein the cut filter comprises at least one metal oxide film deposited on a substrate and the metal oxide film has a thickness and a refraction index corresponding to the wavelength of the light to be filtered off.
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Abstract
A cut filter is used in a backlight module or a display device and positioned over the light source to filter off a part of the light comprising an overlap of at least two of the red light, the green light, and the blue light. By filtering off the overlapping part of light emitted from the light source to obtain a purer primary color light, the display device equipped with a conventional color filter can attain an improved color gamut.
8 Citations
24 Claims
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1. A backlight module of a liquid crystal display, comprising:
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a housing; a light source positioned in the housing for emitting a light comprising a red light, a green light and a blue light; and a cut filter positioned over the light source to filter off a part of the light comprising an overlap of at least two of the red light, the green light, and the blue light, wherein the cut filter comprises at least one metal oxide film deposited on a substrate and the metal oxide film has a thickness and a refraction index corresponding to the wavelength of the light to be filtered off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A display device, comprising:
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a backlight module, comprising; a housing; and a light source positioned in the housing for emitting a light comprising a red light, a green light and a blue light; a display panel positioned over the backlight module, comprising a TFT array substrate and a color filter substrate; and a cut filter positioned over the backlight module to filter off a part of the light comprising an overlap of at least two of the red light, the green light, and the blue light, wherein the cut filter comprises at least one metal oxide film deposited on a substrate and the metal oxide film has a thickness and a refraction index corresponding to the wavelength of the light to be filtered off. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of improving color gamut of a display device comprising a light source to emit a light, a TFT array substrate and a color filter substrate to form a display panel, comprising:
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obtaining a spectrum for the light emitted from the light source by a spectrometer, wherein the spectrum for the light has a first range of wavelengths for a red light, a second range of wavelengths for a green light, and a third range of wavelengths for a blue light; determining at least a fourth range of wavelengths for the spectrum comprising an overlap of at least two of the first range of wavelengths for the red light, the second range of wavelengths for the green light, and the third range of wavelengths for the blue light; and providing at least one cut filter to filter off the fourth range of wavelengths of the light, such that the color gamut of the display device is improved, wherein the cut filter comprises at least one metal oxide film having a thickness and a refraction index corresponding to the wavelength of the light to be filtered off. - View Dependent Claims (22, 23, 24)
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Specification