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Drive voltage generation circuit for light emitting diode display device and method for driving the same

A technology of light-emitting diodes and driving voltage, which is applied in lighting devices, electroluminescent light sources, light sources, etc., and can solve problems such as interrupting the driving voltage and interrupting the driving voltage of the protection circuit

Active Publication Date: 2013-06-26
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be a problem: Even when an input voltage with a normal level is input, the protection circuit will interrupt the output of the driving voltage due to its internal compensation voltage
There will be another problem: when the external input voltage is lower than a certain voltage level, even if the lower input voltage is within the normal voltage range, the protection circuit can interrupt the output of the driving voltage due to its internal compensation voltage

Method used

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  • Drive voltage generation circuit for light emitting diode display device and method for driving the same
  • Drive voltage generation circuit for light emitting diode display device and method for driving the same
  • Drive voltage generation circuit for light emitting diode display device and method for driving the same

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Embodiment Construction

[0035] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0036] figure 1 is a block diagram illustrating a light emitting diode (LED) display device according to an exemplary embodiment of the present invention.

[0037] Such as figure 1 As shown, the LED display device according to the illustrated embodiment of the present invention includes: a display unit DSP, a system SYS, a scan driver SD, a data driver DD, a timing controller TC and a power supply PS.

[0038] The display unit DSP includes a plurality of pixels PXL. In order to transmit various signals required by the pixels PXL to display images, the display unit DSP may further include a plurality of scan lines SL1 to SLm, a plurality of data lines DL1 to DLn, and a plurality of voltage supply lines. ...

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Abstract

A drive voltage generation circuit for an LED display device capable of increasing the input voltage range thereof is disclosed. The drive voltage generation circuit includes a booster that boosts an input voltage from an external source, to generate a boosted voltage, a protection switching element that controls whether or not the boosted voltage generated from the booster is to be output, in accordance with a switch control signal, a protection circuit that compares a level of the boosted voltage output from the booster via the protection switching element with a predetermined threshold voltage, selects one of a high voltage and a low voltage, based on a result of the comparison, and outputs the selected voltage as the switch control signal, and a discharger that discharges a low voltage node, to which the low voltage is applied.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2011-0142381 filed on December 26, 2011, which is incorporated by reference as if fully disclosed herein. technical field [0002] The present invention relates to a voltage supply circuit for a light-emitting diode (LED) display device, and more particularly, to a driving voltage generation circuit for an LED display device capable of increasing its input voltage range. Background technique [0003] A pixel of a light emitting diode (LED) display device includes individual LEDs. Each LED emits light according to a driving current generated by a driving voltage. [0004] The driving voltage is generated from the driving voltage generating circuit. That is, the voltage generation circuit generates a driving voltage based on an input voltage from an external source. The drive voltage generation circuit includes an external protection circuit. The protection circuit serves to interrupt the output ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32H05B44/00
CPCG09G3/3225G09G2330/028G09G2330/04Y02B20/30
Inventor 金炳熙
Owner LG DISPLAY CO LTD
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