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Display apparatus, quantity-of-light adjusting method for display apparatus and electronic equipment

一种显示装置、光量调整的技术，应用在照明装置、电路、光学等方向，能够解决算法复杂等问题

Inactive Publication Date: 2009-04-22
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this can disadvantageously complicate the algorithm used to control the brightness increase or decrease while maintaining a constant chromaticity

Method used

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  • Display apparatus, quantity-of-light adjusting method for display apparatus and electronic equipment
  • Display apparatus, quantity-of-light adjusting method for display apparatus and electronic equipment
  • Display apparatus, quantity-of-light adjusting method for display apparatus and electronic equipment

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] Embodiments of the present invention will be described with reference to the drawings.

[0054] [Layout in LED backlight]

[0055] figure 1 is a schematic plan view illustrating a layout in an LED backlight. The LED backlight is placed at the rear of a display part such as a liquid crystal panel in the display device 1 and supplies light to the display part. In the LED backlight, one unit U has a plurality of R, G, and B LEDs, and each unit U is arranged horizontally and vertically. As the area of ​​a display part such as a liquid crystal panel increases, the number of units U arranged horizontally and vertically increases. However, one unit U may be provided for a smaller-area display part.

[0056] [Unit configuration]

[0057] Figure 2A and 2B is a schematic diagram illustrating the configuration of an LED unit employed in an LED backlight, Figure 2A is the layout diagram, Figure 2B is a circuit diagram. In one unit, R (red), G (green), and B (blue) LEDs...

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PUM

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Abstract

A display apparatus includes display means for displaying an image, a light source that irradiates light to the display means, and control means for controlling the quantity of light of the light source with pulse width modulation. The control means controls the quantity of light of the light source based on the ratio of the light-on period with pulse width modulation to the light-off period when the light source is turned off.

Description

technical field [0001] The present invention relates to a display device that displays an image by irradiating light from a light source to a display part, a light amount adjustment method for the display device, and electronic equipment. Background technique [0002] Liquid crystal displays including liquid crystal televisions can use LED (or light emitting diode) devices as their backlights, and one advantage is that the range of brightness control is wider than that of CCFL (cold cathode fluorescent lamps) (see, for example, JP-A-2005-310997 (Patent Document 1 )). [0003] CCFL can also control brightness, and mainly includes two methods of voltage light control and current light control. The former is a method of feeding back the voltage to be applied to the transformer and adjusting the voltage for light control, and usually has a light control range of 50% to 100%. [0004] The latter is a method of feeding back the output current and adjusting the voltage to be appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G02F1/133G02F1/13357H01L33/00H05B37/02G02F1/1335G09G3/20H05B44/00
CPCG09G2320/064G09G2360/145G09G2320/041H05B33/0869G09G2320/0666H05B45/22H05B45/37
Inventor 市川弘明菊地贤一畑尻公夫
Owner SONY CORP
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