Liquid crystal display device

A technology of liquid crystal display device and liquid crystal display element, which is applied in the direction of static indicators, cathode ray tube indicators, instruments, etc., can solve the problems such as changes in white chromaticity and red side, achieve the effect of less color change and expand the color reproduction range

Active Publication Date: 2019-06-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that, when the luminance control by PWM is performed as described above, there is a difference in rise and fall characteristics when the phosphors of each color are excited to emit light, depending on the frequency and duty ratio of the PWM signal. Different, the white chromaticity may change from the set specifications, especially when the brightness is adjusted using PWM due to the afterglow characteristic in the red phosphor, the white chromaticity tends to change to the red side

Method used

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Embodiment approach 1

[0061] Embodiments of the present invention will be described below based on the drawings. figure 1 It is an exploded perspective view illustrating the structure of the liquid crystal display device in Embodiment 1 of the present invention. figure 2 is going figure 1 A cross-sectional view of the assembled liquid crystal display device viewed from the A-A direction.

[0062]

[0063] Such as figure 1 as well as figure 2 As shown, the liquid crystal display device 100 of the present invention is composed of the following components: a liquid crystal display element 1; a backlight unit 2 for illuminating the liquid crystal display element 1 from the back; a front frame 3 for disposing the liquid crystal inside; The display element 1 and the backlight unit 2 have an opening 3a for display; and a control circuit board 4 on which a display control circuit 5 is mounted that corresponds to transmission of an image input signal to each pixel of the liquid crystal display elemen...

Embodiment approach 2

[0124] In the first embodiment described above, the gradation correction data corresponds to each duty ratio of the PWM of the signal for driving the white LED, and the quantized numerical data is converted into a data correspondence table and stored in the display control circuit. 5, but in this embodiment 2, such as Figure 12 As shown, on the basis of the structure in Embodiment 1, a chromaticity sensor 8 is further provided in or near the backlight unit 2, and the chromaticity measurement value generated by the chromaticity sensor 8 is extracted by the color component analysis circuit 9 to extract the red component ( filter processing to pass red), and the red intensity information (red intensity data) is input to the display control circuit 5 as a feedback signal. The chromaticity calculation processing part 51 in the display control circuit 5 acquires the red intensity information, compares it with the original chromaticity specification, calculates the gradation correct...

Embodiment approach 3

[0130] Furthermore, in addition to the structure of the above-mentioned first embodiment, a touch panel for externally inputting a position signal with respect to the screen and a substantially transparent glass for protecting the touch panel may be provided on the front surface of the liquid crystal display element 1 . The protection member (none of them is shown) has a cover (not shown) for protecting the control circuit board 4 on the rear surface.

[0131]

[0132] The touch panel (not shown) converts the information related to the position coordinates input from the outside (user) into an electrical signal through a circuit composed of transparent electrodes formed on a transparent substrate, and the output connected to the terminal The wiring part is transmitted to the control circuit of the final product. As the output wiring part, in view of the freedom of connection due to thinness and flexibility, an FPC with wiring formed on a base material on a film is used, but ...

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Abstract

A liquid crystal display includes: a liquid-crystal-display device; a display control circuit; a backlight device; and a light-emitting-diode control circuit that adjusts luminance of the backlight device using a pulse width modulation signal as an output to the white light emitting diode. Gradation correction data corresponding to a chromaticity variation due to a duty ratio of the pulse width modulation signal is stored in the display control circuit in advance, the display control circuit determines the gradation correction data corresponding to input image data input to the liquid crystal display, based on the input image data and the duty ratio, and the display control circuit outputs output image data, which is calculated so as to correct the chromaticity variation based on the gradation correction data and the input image data, as the image signal to the liquid-crystal-display device.

Description

technical field [0001] The present invention relates to a liquid crystal display device, and is particularly applicable to a liquid crystal display device provided with a backlight unit using a white light-emitting diode as a light source. Background technique [0002] With the popularization of information electronic equipment in recent years, thin and light liquid crystal display devices are used as display screens for mobile phones and personal computers, various devices used in industrial applications, vehicle-mounted displays, portable terminals, or advertising displays Machines, and furthermore, such as ticket vending machines or ATM (cash automatic teller machine) display devices, mobile phones or tablet PCs and other mobile terminals, in which an input device such as a touch panel or a transparent plate for screen protection is combined on the front surface of the liquid crystal display panel Liquid crystal display devices are also widely used. [0003] Many of thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357G09G3/34
CPCG02F1/133603G02F1/133609G09G3/3406G02F1/133614G09G3/3413G09G5/026G09G2320/0242G09G2320/064G09G2320/0646G09G2320/0666G09G2360/16
Inventor 森明博
Owner MITSUBISHI ELECTRIC CORP
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