Liquid crystal display device

Abstract

A liquid crystal display device in which a frame of the image signal to be displayed is written into a liquid crystal display panel (6) while a backlight (7) is activated intermittently within one frame period so as to prevent blur injury arising when displaying motion pictures includes: means (8) and (9) for variably controlling the illumination duration of the backlight (7) based on the detected type of the image content to be displayed. This configuration makes it possible to appropriately control the image quality degradation caused by blur injury, stroboscopic effect and flickering, hence realize total image quality improvement.

Description

technical field [0001] The present invention relates to a liquid crystal display device for illuminating a liquid crystal display panel with a backlight source and displaying images, and more particularly to a liquid crystal display device for preventing motion blur during display of moving images by approaching pulse-type display. Background technique [0002] In recent years, efforts have been made to develop flat-panel display devices (FPD) such as liquid crystal display devices (LCD) that can realize high definition, low power consumption, and space saving. Among them, LCDs are used in computer display devices and television display devices. The popularity is very remarkable. However, in contrast to cathode ray tubes (CRTs), which are primarily used for this purpose, the disadvantage of "motion blur" in LCDs can be pointed out, that is, when a moving image is displayed, the viewer perceives the outline of moving parts to be blurred. [0003] For example, as disclosed in...

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Problems solved by technology

[0023] (2) It can be considered that the visual characteristics when watching moving images have the time integral effect of eyeball movement and vision, and the visual response to the intensity of light stimulation is nonlinear, but the most important tracking movement in eye movement in perceiving moving images (the left and right eyes roughly The characteristics of the same tracking of moving objects) vary depending on the moving speed of the moving object image, and when some image content is displayed with a reduced pulse rate, the above-mentioned stroboscopic defect may occur

[0024] For example, in the case of an image that is moving (full motion) on the full screen in the horizontal direction as in the broadcast of sports such as rugby and volleyball, the image quality degradation due to motion blur is significant, so it is best to reduce the pulse rate as much as possible. In this way, moving image display with reduced motion blur and clear outline can be realized. However, in the case of an image where the person of interest is fixed and the background is moving, reducing the pulse rate will lead to a high possibility of image degradation caused by the above-mentioned stroboscopic defect.

[0025] (3) Moreover, when the pulse rate is reduced, on the opposite side of reducing the motion blur defect of the moving image, the black display time (non-display time of the image) in 1 frame period is increased, so especially in the white image display part Flicker is conspicuous, resulting in deterioration of image quality due to this flicker

[0027] The optimal pulse rate varies depending on the image content, image material, etc., and due to individual differences in users, the sensory sensitivity (dynamic vision) to motion blur, strobe, and flicker varies greatly, so it is difficult to improve the overall image quality for each user. The problem

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