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Drive device for back light unit and drive method therefor

A technology of backlight unit and driving method, applied in the direction of electrical components, instruments, circuits, etc.

Inactive Publication Date: 2009-08-19
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the performance of the light sensor and / or the temperature characteristics of the luminescence distribution of the LED element is a limit to the accuracy of maintenance, so that the chromaticity control deviation is approximately Δx≈0.002 and Δy≈0.002

Method used

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  • Drive device for back light unit and drive method therefor
  • Drive device for back light unit and drive method therefor
  • Drive device for back light unit and drive method therefor

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Experimental program
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Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] The invention is applied, for example, to having figure 1 Shown is a color liquid crystal display device 100 configured with a backlight system.

[0045] Such as figure 1 The illustrated color liquid crystal display device 100 includes a transmission type color liquid crystal display panel 10 and a backlight unit 20 disposed on the rear side of the color liquid crystal display panel 10 .

[0046] The transmissive color liquid crystal display panel 10 has a configuration in which a TFT substrate (substrate) 11 and a counter electrode substrate (substrate) 12 are arranged facing each other, and a liquid crystal layer 13 is provided in a space between the two substrates, in The liquid crystal layer 13 is filled with, for example, twisted nematic (TN) liquid crystals. On the TFT substrate 11, there are formed signal lines 14 and scanning lines 15 a...

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PUM

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Abstract

A drive unit for a back light unit (20) having a plurality of LED (Light Emission Diode) elements concatenated for each of three primary colors, comprising a signal generating unit (44) for generating a signal with an arbitrary amplitude, a unit (50) for regulating the light emitting quantities of LED element groups (30) based on a signal generated by the signal generating unit (44), a voltage applying unit (41) for applying a specified voltage to each of LED element groups (30), a light emitting quantity detection unit (33) for detecting a light quantity emitted from an LED element group (30) according to a voltage applied by the voltage applying unit (41), a calorie detection unit (32) for detecting calorie emitted from an LED element group (30), and a control unit (50) for controlling the signal generating unit (44) based on a light emitting quantity detected by the light emitting quantity detection unit (33) and calorie detected by the calorie detection unit (32).

Description

technical field [0001] The present invention relates to a driving device and a driving method suitable for performing driving control of a backlight unit composed of a plurality of groups of LED elements. [0002] This application claims the benefit of Japanese Patent Application No. 2004-205146 filed on July 12, 2004 and Japanese Patent Application No. 2004-336373 filed on November 19, 2004, which are hereby incorporated by reference in their entirety content. Background technique [0003] In a display device using LED (Light Emitting Diode) elements as display pixels, in order to perform a matrix driving operation of the LED elements, an X-Y addressing driving circuit for each pixel is required. A display device for performing selection (addressing) of an LED element located at the position of a pixel desired to be emitted (lighted up) using an addressing drive circuit to modulate the lighting using a PWM (Pulse Width Modulation) drive system, for example time, thereby p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/00G09G3/34
Inventor 古川德昌市川弘明菊地贤一
Owner SONY CORP