Backlight module, driving method thereof and display device

Abstract

The invention discloses a backlight module, a driving method thereof and a display device. The backlight module comprises a yellow backlight unit, a blue backlight unit located on the light-emitting side of the yellow backlight unit and an optical film located on the light-emitting side of the blue backlight unit. The yellow backlight unit emits yellow backlight; the blue backlight unit emits bluebacklight. The blue backlight unit and the yellow backlight unit can be independently driven, when a display picture is a blue picture, the yellow backlight unit is closed, only the blue backlight unit is independently driven, at the moment, a backlight spectrum only has a blue light band and does not have a green light band, and light rays of the green light band do not exist even if the light rays are filtered by a blue color resistor. Therefore, the color purity of the blue primary color light is higher. Similarly, when the display picture is a green picture and / or a red picture, the bluelight backlight unit is turned off, only the yellow light backlight unit is independently driven, and at the moment, high-purity green primary color light can be obtained. Therefore, high color gamutdisplay can still be realized even under the condition that the color resistance filtering performance is limited.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a backlight module, its driving method and a display device. Background technique [0002] The liquid crystal display panel currently used is composed of an array substrate and a color film substrate. The backlight module needs to provide a white backlight, and the white light is filtered by the color resist on the color film substrate to form three primary color lights, and then each sub-unit is controlled according to the array substrate. The data signal of the pixel unit is used to make each sub-pixel unit display different grayscale brightness, combined with the color of the sub-pixel to form a display screen. [0003] However, the color resistance used at this stage is limited by the characteristics of the color resistance material, and the thickness of the color resistance cannot be set too thick in order to increase the transmittance, so that the blue color resistance sti...

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Problems solved by technology

[0003] However, the color resistance used at this stage is limited by the characteristics of the color resistance material, and the thickness of the color resistance cannot be set too thick in order to increase the transmittance, so that the blue color resistance still has a high transmittance in the green band. While the blue color resistance filters out blue light, part of the light in the green band passes through, which affects the color purity of blue light; similarly, the green color resistance also has a certain transmittance in the blue band, and the green color resistance filters out green light. At the same time, part of the light in the blue band passes through the light, which also affects the color purity of green light.

Then, in view of the limitation of color resistance at this stage, the display panel cannot achieve a higher color gamut range.

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