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Light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting

A light-emitting diode and dynamic scanning technology, which is applied in the direction of electric lamp circuit layout, electric light source, light source, etc., can solve problems such as current overshoot, achieve the effect of improving gray scale, improving display effect, and reducing power consumption

Active Publication Date: 2011-08-31
SUZHOU YONGJIAN PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The invention provides a light-emitting diode dynamic scanning drive circuit that prevents current overshoot, which solves the problem of severe current overshoot that occurs when the row selection tube in the LED load circuit is switched from the cut-off state to the conduction state, and reduces the cost of LED products. power consumption, and effectively protects the drive circuit

Method used

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  • Light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting
  • Light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting
  • Light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting

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Effect test

Embodiment 1

[0038] Such as image 3 with Figure 4 As shown, a light-emitting diode dynamic scanning drive circuit for preventing current overshoot includes an LED load circuit 2, a constant current drive output circuit 1 connected to the LED load circuit 2, and an overshoot measurement and control circuit 3 connected to the constant current drive output circuit 1. .

[0039] The constant current drive output circuit 1 consists of an operational amplifier AMP1, a switch unit SW, and a constant current tube M. 0 , Adjustment tube M 1 , Composition of resistance R0.

[0040] The positive input terminal of the operational amplifier AMP1 is connected to the reference voltage V ref1 , The negative input terminal of the operational amplifier AMP1 is connected to the regulator M 1 The source d of the operational amplifier AMP1 is connected to the regulator M through the switch unit SW. 1 The grid b and realize the negative feedback impedance adjustment, forcing the constant current tube M 0 The drain...

Embodiment 2

[0052] Such as Figure 5 As shown, a light-emitting diode dynamic scanning drive circuit for preventing current overshoot includes an LED load circuit 2, a constant current drive output circuit 1 connected to the LED load circuit 2, and an overshoot measurement and control circuit 3 connected to the constant current drive output circuit 1. .

[0053] Constant current drive output circuit 1 is composed of operational amplifier AMP1, switch tube M k , Constant current tube M 0 , Adjustment tube M 1 It is composed of constant current CMOS transmission gate K.

[0054] The positive input terminal of the operational amplifier AMP1 is connected to the reference voltage V ref1 , The negative input terminal of the operational amplifier AMP1 is connected to the constant current tube M 0 The drain of the operational amplifier AMP1 is connected to the regulator M 1 The grid b and realize the negative feedback impedance adjustment, forcing the constant current tube M 0 The drain voltage is equ...

Embodiment 3

[0066] Such as Image 6 As shown, a light-emitting diode dynamic scanning drive circuit for preventing current overshoot includes an LED load circuit 2, a constant current drive output circuit 1 connected to the LED load circuit 2, and an overshoot measurement and control circuit 3 connected to the constant current drive output circuit 1. .

[0067] Constant current drive output circuit 1 is composed of operational amplifier AMP1, switch tube M k , Constant current tube M 0 , Adjustment tube M 1 It is composed of constant current CMOS transmission gate K.

[0068] The positive input terminal of the operational amplifier AMP1 is connected to the reference voltage V ref1 , The negative input terminal of the operational amplifier AMP1 is connected to the constant current tube M 0 The drain of the operational amplifier AMP1 is connected to the regulator M 1 The grid b and realize the negative feedback impedance adjustment, forcing the constant current tube M 0 The drain voltage is equa...

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Abstract

The invention discloses a light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting. The driving circuit provided by the invention comprises an LED load circuit, a constant-current driving output circuit connected with the LED load circuit and an overshooting measurement and a control circuit connected with the constant-current driving output circuit. According to the invention, the overshooting measurement and control circuit is utilized to detect a state of the LED load circuit when the closure of all row selection pipes and the opening of constant-current output channels are carried out simultaneously; the constant-current output channels are closed or enter into a high-resistance conducting state before the row selection pipes are conducted; and the constant-current output channels are turned back to a normal constant-current output state after the row selection pipes are conducted, thus the problem of serious current overshooting occurred when the row selection pipes are changed into the conducting state from the closed state is effectively eliminated, the driving circuit is effectively protected, the display effect of LED dynamic scan driving application is improved, the gradation of grey is greatly enhanced, and the cost and power consumption of LED products are reduced.

Description

Technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a light emitting diode (LED) dynamic scanning driving circuit for preventing current overshoot. Background technique [0002] In the application of LED display, backlighting, and lighting, with the improvement of LED luminous efficiency, and the promotion of reducing power consumption and cost reduction, the driving mode of LED has expanded from static scanning driving mode to dynamic scanning driving mode. The so-called static scanning method refers to the "point-to-point" application in which the constant current output channel of the driver chip directly drives the LED, while the dynamic scanning method refers to the "point-to-column" application of the driver chip and the row control circuit using the persistence of human vision. Each column of constant current output channels time-sharing drive multi-point LED. Commonly used dynamic scan drives include 1 / ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 赵轶唐尧何乐年
Owner SUZHOU YONGJIAN PHOTOELECTRIC TECH
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