CN203520843U - Hand-held terminal liquid crystal screen drive circuit - Google Patents
Hand-held terminal liquid crystal screen drive circuit Download PDFInfo
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- CN203520843U CN203520843U CN201320684639.7U CN201320684639U CN203520843U CN 203520843 U CN203520843 U CN 203520843U CN 201320684639 U CN201320684639 U CN 201320684639U CN 203520843 U CN203520843 U CN 203520843U
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- liquid crystal
- lcd
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Abstract
The utility model provides a hand-held terminal liquid crystal screen drive circuit. Alternatively turning on/ turning off an LCD liquid crystal screen through charge pump circuits is achieved; the LCD liquid crystal screen is provided with an efficient and stable adjustment voltage; and the adjustment voltage is then loaded to a display electrode, and the voltage difference between the display electrode and a common electrode is functioned on the liquid crystal screen for displaying, so that the stabilization of the circuit is effectively guaranteed. A backlight drive circuit of the hand-held terminal liquid crystal screen drive circuit is connected with an enabling control terminal LCD_PWREN, so that the circuit works in high level and is disconnected in low level, and power consumption can be effectively saved. Compared with the prior art, the hand-held terminal liquid crystal screen drive circuit has the advantages of being simple in circuit structure, low in power consumption and stable and reliable.
Description
Technical field
The utility model relates to handheld terminal, and what be specifically related to is a kind of handheld terminal liquid crystal display driving circuit.
Background technology
Existing handheld terminal is very extensive in logistics field application, in order to guarantee that handheld terminal can normally work for a long time, need to reduce as much as possible the kwh loss of handheld terminal.Common handheld terminal liquid crystal display drive circuit all needs to adopt independent liquid crystal backboard to connect liquid crystal display at present, and it not only exists functional circuit module more, complex structure, the problem of poor work stability; But also there is the shortcoming expensive, power consumption is large, greatly reduce the stand-by time of handheld terminal and the stability of work.
Utility model content
For this reason, the purpose of this utility model be to provide that a kind of circuit structure is simple, low-cost, low-power consumption and reliable and stable handheld terminal liquid crystal display driving circuit.
The purpose of this utility model is achieved through the following technical solutions.
A handheld terminal liquid crystal display driving circuit, comprising: LCD liquid crystal display, pin connector and LCD driving circuit, and described LCD driving circuit is connected with LCD liquid crystal display by pin connector; Described LCD driving circuit comprises lcd driver, the first charge pump circuit and the second charge pump circuit; The LX pin of described lcd driver is divided into two-way output, the diode D5 of leading up to output analog voltage AVDD is to LCD liquid crystal display, the capacitor C 8 of separately leading up to is connected with diode D6, diode D7 in parallel afterwards, between described diode D6, diode D7, by capacitor C 9, connect, and described diode D6 and capacitor C 9 link output-5V voltages; Described the first charge pump circuit comprises resistance R 3, resistance R 2, diode D1, diode D2 and capacitor C 5, the DRVN pin of described lcd driver is divided into two-way after being connected with capacitor C 5, one tunnel is connected with the positive pole of diode D1, and another road is connected with the negative pole of diode D2; The FBN pin of described lcd driver is divided into two-way output, and the resistance R 3 of leading up to is connected with the REF pin of lcd driver, and after the resistance R 2 of separately leading up to is connected with the positive pole of described diode D2, output is closed voltage VGL to LCD liquid crystal display; Described the second charge pump circuit comprises resistance R 8, resistance R 9, capacitor C 12, diode D6 and diode D7, the DRVP pin of described lcd driver is divided into two-way output after being connected with capacitor C 12, one tunnel is connected with the negative pole of diode D6, and another road is connected with the positive pole of diode D7; FBP pin and the output of described lcd driver are divided into two-way, and the resistance R 9 of leading up to is connected with the TGND pin of described lcd driver, and after the resistance R 8 of separately leading up to is connected with the negative pole of diode D7, output cut-in voltage VGH is to LCD liquid crystal display.
Preferably, also include a lcd controller and a LED-backlit driving circuit, described LED-backlit driving circuit comprises backlight driving chip U1, the EN pin of described backlight driving chip U1 is connected with lcd controller, by described lcd controller input power switching signal, between the FB1 of described backlight driving chip U1, FB2, FB3 pin, be connected to each other, and arrive LCD liquid crystal display by FB1 pin output backlight signal; The OLS pin output terminal of described backlight driving chip U1 is divided into two-way, and the diode D4 of leading up to is connected with the SW pin of described backlight driving chip U1, and another road output backlight signal is to LCD liquid crystal display.
Preferably, described backlight driving chip U1 is MP1521 chip.
Preferably, described lcd controller is chip S3C2440A.
Preferably, described lcd driver is chip MAX1779.
Preferably, also include a VCOM driver, described VCOM driver is connected with the positive terminal of described capacitor C 9 and diode D6, by the LX pin output-5V voltage of described lcd driver.
The handheld terminal liquid crystal display driving circuit that the utility model provides, by charge pump circuit, realize the On/Off in turn of LCD liquid crystal display, for LCD liquid crystal display provides the regulation voltage of efficient stable, and be loaded into show electrode, make the voltage difference between show electrode and public electrode act on liquid crystal realization demonstration, thereby effectively guaranteed the stable of circuit; The utility model backlight drive circuit is connected to and enables control end LCD_PWREN, circuit working during high level; During low level, circuit turn-offs, and can effectively save power consumption.Compared with prior art, the utlity model has simple, the low in energy consumption and reliable and stable advantage of circuit structure.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of the utility model handheld terminal liquid crystal display driving circuit;
Fig. 2 is the LCD driving circuit principle figure of the utility model handheld terminal liquid crystal display driving circuit;
Fig. 3 is the backlight drive circuit schematic diagram of the utility model handheld terminal liquid crystal display driving circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to shown in Fig. 1 to Fig. 3, Fig. 1 is the circuit structure block diagram of the utility model handheld terminal liquid crystal display driving circuit; Fig. 2 is the LCD driving circuit principle figure of the utility model handheld terminal liquid crystal display driving circuit; Fig. 3 is the backlight drive circuit schematic diagram of the utility model handheld terminal liquid crystal display driving circuit.The utility model embodiment is applied to low cost, low-power consumption, high stability and the liquid crystal display driving circuit simple in structure on handheld terminal.
Wherein the present embodiment handheld terminal liquid crystal display driving circuit includes: LCD liquid crystal display, pin connector, LCD driving circuit, VCOM driver, lcd controller and LED-backlit driving circuit.In LCD liquid crystal display, be integrated with digital circuit and mimic channel, need outside that digital voltage DVDD and analog voltage AVDD are provided.In addition, in order to complete data scanning, also need LCD driving circuit On/Off in turn, when opening, data are loaded into show electrode by source electrode driver, voltage difference between show electrode and public electrode remakes for liquid crystal and realize to show, therefore need to control LCD driving circuit cut-in voltage VGH, close voltage VGL and be added to the voltage VCOM on public electrode.
In the present embodiment, LCD driving circuit comprises lcd driver, the first charge pump circuit, the second charge pump circuit and a booster circuit.Lcd driver adopts chip MAX1779, MAX1779 inside is integrated with three DC-DC transducers, can provide efficient regulation voltage for liquid crystal display, it can correspondingly produce analog voltage AVDD, grid cut-in voltage VGH and gate off voltage VGL, and corresponding by pin connector, being input to LCD liquid crystal display, MAX1779 chip can produce analog voltage AVDD, grid cut-in voltage VGH and the gate off voltage VGL that LCD needs.
The LX pin of lcd driver is divided into two-way output, the diode D5 of leading up to output analog voltage AVDD is to LCD liquid crystal display, separately lead up to after capacitor C 8 and diode D6 in parallel, diode D7 connects, described diode D6, between diode D7, by capacitor C 9, connect, and described diode D6 and capacitor C 9 link output-5V voltages are to VCOM driver, described VCOM driver is connected with the positive terminal of described capacitor C 9 and diode D6, it adopts chip LM8261, it together produces VCOM signal with input+5V voltage of outside, by pin connector, be input to LCD liquid crystal display.
In LCD driving circuit, the first charge pump circuit comprises resistance R 3, resistance R 2, diode D1, diode D2 and capacitor C 5, the DRVN pin of described lcd driver is divided into two-way after being connected with capacitor C 5, one tunnel is connected with the positive pole of diode D1, and another road is connected with the negative pole of diode D2; The FBN pin of described lcd driver is divided into two-way output, and the resistance R 3 of leading up to is connected with the REF pin of lcd driver, and after the resistance R 2 of separately leading up to is connected with the positive pole of described diode D2, output is closed voltage VGL to LCD liquid crystal display.
In LCD driving circuit, the second charge pump circuit comprises resistance R 8, resistance R 9, capacitor C 12, diode D6 and diode D7, the DRVP pin of described lcd driver is divided into two-way output after being connected with capacitor C 12, one tunnel is connected with the negative pole of diode D6, and another road is connected with the positive pole of diode D7; FBP pin and the output of described lcd driver are divided into two-way, and the resistance R 9 of leading up to is connected with the TGND pin of described lcd driver, and after the resistance R 8 of separately leading up to is connected with the negative pole of diode D7, output cut-in voltage VGH is to LCD liquid crystal display.
Lcd controller is chip S3C2440A, backlight driving chip U1 is MP1521, described LED-backlit driving circuit comprises backlight driving chip U1, the EN pin of described backlight driving chip U1 is connected with lcd controller, by described lcd controller input power switching signal, between the FB1 of described backlight driving chip U1, FB2, FB3 pin, be connected to each other, and arrive LCD liquid crystal display by FB1 pin output backlight signal; The OLS pin output terminal of described backlight driving chip U1 is divided into two-way, and the diode D4 of leading up to is connected with the SW pin of described backlight driving chip U1, and another road output backlight signal is to LCD liquid crystal display.Backlight driving chip U1 has 3 groups of independently current feedback loops, can drive the LED of 3 groups of parallel connections simultaneously, now by 3 backfeed loop short circuits, for driving 6 White LED backlights, can provide larger drive current, and circuit design has overcurrent protection function.In order to save power consumption, circuit is connected to and enables control end LCD_PWREN, circuit working during high level; During low level, circuit turn-offs, to save power consumption.Lcd controller can produce for controlling the clock signal of TFT-LCD, mainly comprise VCLK (picture point clock), VDEN (data useful signal), VSYNC (vertical synchronizing signal), HSYNC (horizontal-drive signal), LEND (row end signal) and LCD_PWREN (liquid crystal display enable signal).VCLK signal is the pixel clock signal of lcd controller and lcd driver, and lcd controller is sent data at the rising edge place of VCLK signal, at the falling edge of VCLK signal, by lcd controller, is sampled; VSYNC signal is vertical synchronizing signal (also claiming frame synchronizing signal), is used to refer to the beginning of a new two field picture; HSYNC signal is horizontal-drive signal (or line synchronizing signal), the beginning being used for to the line scan signals making new advances; VDEN signal is data enable signal; LEND signal is line scanning end signal, and lcd driver provides this signal after every scanning one-row pixels; LCD_PWREN signal is used for controlling opening or closing of lcd controller, to reduce power consumption.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. a handheld terminal liquid crystal display driving circuit, is characterized in that, comprising: LCD liquid crystal display, pin connector and LCD driving circuit, and described LCD driving circuit is connected with LCD liquid crystal display by pin connector; Described LCD driving circuit comprises lcd driver, the first charge pump circuit and the second charge pump circuit; The LX pin of described lcd driver is divided into two-way output, the diode D5 of leading up to output analog voltage AVDD is to LCD liquid crystal display, the capacitor C 8 of separately leading up to is connected with diode D6, diode D7 in parallel afterwards, between described diode D6, diode D7, by capacitor C 9, connect, and described diode D6 and capacitor C 9 link output-5V voltages; Described the first charge pump circuit comprises resistance R 3, resistance R 2, diode D1, diode D2 and capacitor C 5, the DRVN pin of described lcd driver is divided into two-way after being connected with capacitor C 5, one tunnel is connected with the positive pole of diode D1, and another road is connected with the negative pole of diode D2; The FBN pin of described lcd driver is divided into two-way output, and the resistance R 3 of leading up to is connected with the REF pin of lcd driver, and after the resistance R 2 of separately leading up to is connected with the positive pole of described diode D2, output is closed voltage VGL to LCD liquid crystal display; Described the second charge pump circuit comprises resistance R 8, resistance R 9, capacitor C 12, diode D6 and diode D7, the DRVP pin of described lcd driver is divided into two-way output after being connected with capacitor C 12, one tunnel is connected with the negative pole of diode D6, and another road is connected with the positive pole of diode D7; FBP pin and the output of described lcd driver are divided into two-way, and the resistance R 9 of leading up to is connected with the TGND pin of described lcd driver, and after the resistance R 8 of separately leading up to is connected with the negative pole of diode D7, output cut-in voltage VGH is to LCD liquid crystal display.
2. handheld terminal liquid crystal display driving circuit according to claim 1, it is characterized in that, also include a lcd controller and a LED-backlit driving circuit, described LED-backlit driving circuit comprises backlight driving chip U1, the EN pin of described backlight driving chip U1 is connected with lcd controller, by described lcd controller input power switching signal, between the FB1 of described backlight driving chip U1, FB2, FB3 pin, be connected to each other, and arrive LCD liquid crystal display by FB1 pin output backlight signal; The OLS pin output terminal of described backlight driving chip U1 is divided into two-way, and the diode D4 of leading up to is connected with the SW pin of described backlight driving chip U1, and another road output backlight signal is to LCD liquid crystal display.
3. handheld terminal liquid crystal display driving circuit according to claim 2, is characterized in that, described backlight driving chip U1 is MP1521 chip.
4. handheld terminal liquid crystal display driving circuit according to claim 2, is characterized in that, described lcd controller is chip S3C2440A.
5. handheld terminal liquid crystal display driving circuit according to claim 1, is characterized in that, described lcd driver is chip MAX1779.
6. handheld terminal liquid crystal display driving circuit according to claim 1, it is characterized in that, also include a VCOM driver, described VCOM driver is connected with the positive terminal of described capacitor C 9 and diode D6, by the LX pin output-5V voltage of described lcd driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684639.7U CN203520843U (en) | 2013-10-30 | 2013-10-30 | Hand-held terminal liquid crystal screen drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684639.7U CN203520843U (en) | 2013-10-30 | 2013-10-30 | Hand-held terminal liquid crystal screen drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203520843U true CN203520843U (en) | 2014-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320684639.7U Expired - Fee Related CN203520843U (en) | 2013-10-30 | 2013-10-30 | Hand-held terminal liquid crystal screen drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203520843U (en) |
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2013
- 2013-10-30 CN CN201320684639.7U patent/CN203520843U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20181030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |