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LED display apparatus and video display apparatus

A technology for a display device and a display part, which is applied to static indicators, cathode ray tube indicators, instruments, etc., and can solve the problems of LED display part image quality degradation, residual brightness deviation and color deviation, and unimproved correction accuracy, etc.

Inactive Publication Date: 2016-11-30
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the accuracy of the correction is not improved, luminance and color variations remain, and the image quality of the LED display portion deteriorates. In order to solve this problem, it is necessary to replace the LED module with a new one.

Method used

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  • LED display apparatus and video display apparatus
  • LED display apparatus and video display apparatus
  • LED display apparatus and video display apparatus

Examples

Experimental program
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Effect test

Embodiment approach 1

[0028] Next, Embodiment 1 of the present invention will be described using the drawings. figure 1 is a block diagram of the LED display device 100 according to Embodiment 1, figure 2 is a block diagram of the LED display unit 13 of the LED display device 100, image 3 is a block diagram of the LED burn-in unit 20 of the LED display device 100 .

[0029] like figure 1 As shown, the LED display device 100 has a plurality of (2×4=8 units are illustrated in the figure) LED display units 13, an input terminal 2 for video signals, a video signal processing circuit 3, and a brightness correction circuit 4 (brightness correction unit). , the lighting time storage unit 6 , the correction coefficient calculation unit 12 and the LED aging unit 20 . Among them, the control unit 8 is constituted by the video signal processing circuit 3 , the correction coefficient calculation unit 12 , the luminance correction circuit 4 and the lighting time storage unit 6 .

[0030] First, the LED di...

Embodiment approach 2

[0079] Next, an LED display device according to Embodiment 2 will be described. Figure 11 It is a graph for explaining the brightness correction method of the LED display device 100 of the second embodiment. In addition, in Embodiment 2, the same reference numerals are assigned to the same components as those described in Embodiment 1, and description thereof will be omitted.

[0080] like Figure 11 As shown, the luminance decrease rate of each LED 1 differs according to the lighting rate. In Embodiment 1, the maximum duty ratio of the LED 1 of the LED display unit 10 and the maximum duty ratio of the LED 22 of the LED aging display unit 21 are set to be the same, but the luminance reduction rate is also changed according to the driving duty ratio of the LED. Variety. In the present embodiment, the drive data generator 7 generates drive data with multiple duty ratios, so that multiple lighting times are formed, and the LED 22 is driven according to the drive data with mul...

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Abstract

A LED display apparatus and a video display apparatus are provided capable of compensating poor viewability of a display screen without the need for halting operation of an apparatus. An LED display apparatus includes an LED aging unit, a correction factor computing unit, and a luminance correction circuit. The LED aging unit includes an LED aging display that includes an LED (22) and located separately from the LED display, a luminance measurer that measures luminance decrease rates of the LED (22) per color correspondently to lighting periods of LEDs (1), and a luminance decrease rate storage that stores the luminance decrease rates measured by the luminance measurer per color. The correction factor computing unit computes correction factors for correcting luminances of the LEDs (1) per color in accordance with cumulative lighting periods of the LEDs (1) of corresponding colors stored in the lighting period storage and the luminance decrease rates of corresponding colors stored in the luminance decrease rate storage. The luminance correction circuit corrects the luminance of the LEDs (1) per color in accordance with the correction factors computed by the correction factor computing unit.

Description

technical field [0001] The present invention relates to an LED display device and an image display device which arrange a plurality of LEDs in a matrix and display image information by controlling the on and off of each LED, and particularly relates to LED brightness control technology. Background technique [0002] LED display devices using LEDs (Light Emitting Diodes) are widely used for outdoor and indoor advertising displays and the like due to technological development and cost reduction of LEDs. These LED display devices have so far mainly displayed natural images and dynamic images as animations. In indoor applications, the visual recognition distance becomes shorter as the pixel pitch becomes narrower, so they are also used in conference rooms and surveillance. The image display of the computer, etc. In surveillance applications in particular, computer images close to still images are often displayed. However, since the luminance of LEDs decreases as the lighting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G3/2003G09G3/2014G09G3/3208G09G2310/0235G09G2320/0233G09G5/10
Inventor 町田直之涉江重教浅村吉范
Owner MITSUBISHI ELECTRIC CORP