CN201590921U - LCD backlight driving device - Google Patents
LCD backlight driving device Download PDFInfo
- Publication number
- CN201590921U CN201590921U CN 200920259927 CN200920259927U CN201590921U CN 201590921 U CN201590921 U CN 201590921U CN 200920259927 CN200920259927 CN 200920259927 CN 200920259927 U CN200920259927 U CN 200920259927U CN 201590921 U CN201590921 U CN 201590921U
- Authority
- CN
- China
- Prior art keywords
- backlight driving
- driving chip
- current mode
- lcd
- led lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Abstract
The utility model discloses an LCD backlight driving device, which is characterized by comprising a current mode backlight driving chip, a power supply and an LCD lamp, wherein the current mode backlight driving chip is provided with a pulse width modulation signal input end used for being connected with an external control signal and an enabling control end; the power end of the current mode backlight driving chip is connected with the power supply; and the current output end of the current mode backlight driving chip is connected with the LCD lamp. The LCD backlight driving device can guarantee the uniform brightness of the LCD, and the stable backlight effect.
Description
Technical field
The utility model belongs to electronic technology field, relates to a kind of LCD backlight drive device.
Technical background
Adopt voltage-type to drive at the LCD of fighter plane display applications drive pattern backlight at present, this pattern is regulated the LED luminosity by the voltage of regulating LED lamp two ends, like this, different (for example because the problems of welding) appear in the voltage that is easy to cause being applied to different LED lamp two ends, thereby cause LED lamp brightness irregularities,, be easy to cause pilot's visual fatigue owing to show instability, therefore, be necessary existing LCD drive circuit backlight is improved.
The utility model content
The purpose of this utility model is the shortcoming that overcomes prior art, proposes a kind of LCD backlight drive device, and the brightness that this LCD backlight drive device can ensure LED is even, display effect stable.
Technical solution of the present utility model is as follows:
A kind of LCD backlight drive device is characterized in that, comprises current mode backlight driving chip, power supply and LED lamp; Described current mode backlight driving chip has and is used for the pulse-width signal input that joins with external control signal and enables control end; The power end and the power supply of described current mode backlight driving chip join; The current output terminal of described current mode backlight driving chip connects the LED lamp.
Described current mode backlight driving chip has 10 current output channels, and each current output channels all is connected with the LED lamp.
The model of described current mode backlight driving chip is MC34844.
Beneficial effect:
This LCD backlight drive device is by adjusting the luminosity of regulating the LED lamp by the electric current of LED lamp.Because a plurality of LED are connected in series, flow through the electric current unanimity of each LED lamp, can guarantee the luminosity and the consistency of colour of each the LED lamp among the same string LED fully, therefore, adopt this LCD backlight drive device, the brightness of LED is even, can ensure the effect stability backlight of LCD.
Description of drawings
Fig. 1 is the circuit block diagram of embodiment 1.
Embodiment
Below with reference to figure and specific implementation process the utility model is described in further details:
Embodiment 1: as Fig. 1, a kind of LCD backlight drive device is characterized in that, comprises current mode backlight driving chip, power supply and LED lamp; Described current mode backlight driving chip has and is used for the pulse-width signal input that joins with external control signal and enables control end; The power end and the power supply of described current mode backlight driving chip join; The current output terminal of described current mode backlight driving chip connects the LED lamp.Described current mode backlight driving chip has 10 current output channels, and each current output channels all is connected with the LED lamp.The model of described current mode backlight driving chip is the MC34844 of Freescale.
This scheme is exported 10 channel currents and is given LED lamp string, and each passage can provide and reach the 50mA drive current, in MC34844 inside, uses the LDO mode to control each channel current, and 10 passages can in parallel export, so that bigger drive current to be provided.The electric current of each passage can be controlled separately and regulate, and under different technical requirements, the electric current output that only needs to regulate each passage just can be regulated the LED luminosity, therefore can better guarantee the uniformity and the adjustability of LED luminosity like this.
Claims (3)
1. a LCD backlight drive device is characterized in that, comprises current mode backlight driving chip, power supply and LED lamp; Described current mode backlight driving chip has and is used for the pulse-width signal input that joins with external control signal and enables control end; The power end and the power supply of described current mode backlight driving chip join; The current output terminal of described current mode backlight driving chip connects the LED lamp.
2. LCD backlight drive device according to claim 1 is characterized in that, described current mode backlight driving chip has 10 current output channels, and each current output channels all is connected with the LED lamp.
3. LCD backlight drive device according to claim 1 is characterized in that, the model of described current mode backlight driving chip is MC34844.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920259927 CN201590921U (en) | 2009-12-30 | 2009-12-30 | LCD backlight driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920259927 CN201590921U (en) | 2009-12-30 | 2009-12-30 | LCD backlight driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201590921U true CN201590921U (en) | 2010-09-22 |
Family
ID=42750716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920259927 Expired - Lifetime CN201590921U (en) | 2009-12-30 | 2009-12-30 | LCD backlight driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201590921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014075327A1 (en) * | 2012-11-14 | 2014-05-22 | 深圳市华星光电技术有限公司 | Method for using constant current drive chip to generate different currents to drive lamp strips and drive circuit thereof |
-
2009
- 2009-12-30 CN CN 200920259927 patent/CN201590921U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014075327A1 (en) * | 2012-11-14 | 2014-05-22 | 深圳市华星光电技术有限公司 | Method for using constant current drive chip to generate different currents to drive lamp strips and drive circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100922 |
|
| CX01 | Expiry of patent term |