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LED display device and brightness correction method thereof

A technology for display device and brightness correction, which is applied to static indicators, instruments, semiconductor devices, etc., can solve problems such as differences and brightness reduction, and achieve the effects of reducing storage times, reducing power consumption, and achieving precision

Active Publication Date: 2020-08-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the brightness of LEDs decreases as the lighting time becomes longer, the brightness reduction rate of each LED varies depending on the content of the image. As a result, brightness variations and color variations occur for each pixel

Method used

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  • LED display device and brightness correction method thereof
  • LED display device and brightness correction method thereof
  • LED display device and brightness correction method thereof

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Experimental program
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Embodiment approach 1

[0027] figure 1 It is a functional block diagram of the LED display device 100 of the first embodiment. Such as figure 1 As shown, the LED display device 100 has a first display unit 10, a first drive unit 5, a second display unit 20, a second drive unit 8, a luminance measurement unit 9, a luminance reduction rate storage unit 11, and a cumulative lighting time estimation unit. 6. The average duty ratio storage unit 7 , the brightness correction coefficient calculation unit 12 and the brightness correction unit 4 .

[0028] The first display unit 10 has a plurality of unit pixels arranged in a matrix of M rows and N columns. M rows and N columns are, for example, 4 rows and 4 columns, but it is not limited thereto. Three LED elements of red (R), green (G), and blue (B) are arranged in each unit pixel.

[0029]The first drive unit 5 drives the plurality of LED elements included in the first display unit 10 based on the video signal received from the video signal processing...

Embodiment approach 2

[0123] In Embodiment 1, it is assumed that during the unit operating time, the current duty ratio R 1 Drive the LED element to calculate the second cumulative lighting time S 1 (Refer to formula 2).

[0124] In Embodiment 2, in order to calculate the second cumulative lighting time S with higher accuracy 1 , using the average duty ratio R stored in the average duty ratio storage unit 7 0 and the duty cycle of the current moment R 1 Calculate the second cumulative lighting time S from the duty cycle obtained by arithmetic mean 1 . In addition, the structure of the LED display device 100 of the second embodiment is the same as that of the first embodiment ( figure 1 , figure 2 ) are the same, so the explanation is omitted. In Embodiment 2, the second cumulative lighting time S 1 It is represented by the following formula 9.

[0125] [Formula 9]

[0126]

[0127] The calculation method of the first cumulative lighting time in Embodiment 2 is the same as that in Embo...

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Abstract

The object of the present invention is to provide an LED display device and a brightness correction method thereof, which reduce the amount of computation and the amount of stored data required to calculate the lighting time of each LED element, and perform brightness correction of each LED element. The LED display device (100) has: a first display part (10) having a plurality of LED elements; a second display part (20) having the same LED element for measurement as the LED element of the first display part (10) ; Brightness measuring part (9), its measurement measures the brightness of the LED element; Brightness reduction rate storage part (11), its storage measures the brightness reduction rate of the LED element; The set time estimates the cumulative lighting time; the average duty ratio storage part (7) stores the average duty ratio obtained by dividing the estimated cumulative lighting time by the cumulative operating time; and the luminance correction coefficient calculation part ( 12) Refer to the brightness reduction rate storage unit (11) and the average duty ratio storage unit (7) to obtain the brightness reduction rate, and calculate the brightness correction coefficient based on the brightness reduction rate.

Description

technical field [0001] The present invention relates to an LED display device and a brightness correction method thereof, and more particularly to an LED display device that displays image information by controlling blinking of a plurality of LEDs (Light Emitting Diodes: Light Emitting Diodes) arranged in a matrix. Background technique [0002] With the technological development and cost reduction of LEDs, display devices made of LEDs are more widely used in outdoor and indoor advertising displays and the like. These LED display devices have previously been dominated by dynamic image displays of natural images and animations. In recent years, as the pixel pitch has been narrowed, the visual observation distance has been shortened, and it has been applied to meeting rooms, monitoring purposes, and the like. Especially in surveillance applications, personal computer images that are close to static images are increasingly displayed. However, since the luminance of LEDs decrea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/20G09G3/34H01L33/00H05B47/10
CPCG09G3/32G09G3/3225G09G2320/0233G09G2320/0242G09G2320/029G09G2320/043G09G2320/045G09G2320/048G09G2360/145G09G2360/16G02F1/00G09G3/20G09G3/34H01L33/00G09G2310/0264
Inventor 的场隆志涉江重教浅村吉范
Owner MITSUBISHI ELECTRIC CORP
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