CN203799627U - STOD03ASchip based AMOLED (Active-matrix Organic Light Emitting Diode) display screen power supply driving module - Google Patents

Abstract

The utility model relates to an STOD03ASchip based AMOLED (Active-matrix Organic Light Emitting Diode) display screen power supply driving module. The power supply driving module comprises an AMS1117-3.3 voltage conversion module, an MCU and an STOD03AS voltage conversion module which are connected with an input power supply, wherein the STOD03AS voltage conversion module comprises an STOD03AS direct-current conversion chip, inductors L1, L2, an input filtering capacitor C<IN> and output filtering capacitors C<MID>, C<O2>; two output ends of the MCU are connected to an S<WIRE> port and an EN port of the STOD03AS direct-current conversion chip; two output ends V<MIN>, V<O2> of the STOD03AS direct-current conversion chip are connected to an AMOLED display screen; and the output end of the AMS1117-3.3 voltage conversion module is also connected to the AMOLED display screen. The STOD03ASchip based AMOLED display screen power supply driving module enables the circuit to be lightened, thinned and integrated while improving the precision of driving power supply and reducing noises and the loss, and has excellent mobile phone communication noise interference resisting performance.

Description

AMOLED display screen electric power driving module based on STOD03AS chip

Technical field:

The utility model relates to AMOLED power drives technical field, refers in particular to a kind of AMOLED display screen electric power driving module based on STOD03AS chip.

Background technology:

AMOLED(Active-matrix Organic Light Emitting Diode) be active matrix organic light-emitting diode, be called as follow-on display technique.Along with the continuous maturation of AMOLED technology, it is widely used in the consumption electronic products such as mobile phone, notebook computer, MP3 player gradually.Compare with other conventional display panels, have multinomial considerable advantage advantage, the restriction as AMOLED does not have display size aspect, has broader visual angle, high-contrast, the response time being exceedingly fast and slim thickness.

In the power drives of AMOLED display, because present AMOLED display screen has had the TFT matrix of quick switching, so need to provide malleation and negative pressure in peripheral driving power.In the past in the power driving circuit of traditional AMOLED, need to design respectively synchronous rectified boost voltage stabilizer and synchronous rectification inversion voltage stabilizer obtains generating positive and negative voltage.Circuit discrete component is many, and power consumption is large, is also unfavorable for miniaturization.

Utility model content:

The purpose of this utility model is to overcome the above-mentioned weak point of prior art, and a kind of AMOLED display screen electric power driving module based on STOD03AS chip is provided.

The utility model is realized the technical scheme that its object adopts: a kind of AMOLED display screen electric power driving module based on STOD03AS chip, this electric power driving module comprises AMS1117-3.3 voltage transformation module, MCU and the STOD03AS voltage transformation module being connected with input power respectively, wherein, STOD03AS voltage transformation module comprises STOD03AS direct current conversion chip, inductance L 1 and L2, input filter capacitor C _iN, output filter capacitor C _mIDand C _o2; Two output terminals of described MCU connect respectively the S of STOD03AS direct current conversion chip _wIREport and EN port, one end of described inductance L 1 connects input power, input filter capacitor C _iNand the V of STOD03AS direct current conversion chip _iNPport, the other end connects the V of STOD03AS direct current conversion chip _iNPport L _x1port; One end of inductance L 2 connects the L of STOD03AS direct current conversion chip _x2port, other end ground connection; Two output terminal V of STOD03AS direct current conversion chip _mID, V _o2connect respectively AMOLED display screen; The output terminal of AMS1117-3.3 voltage transformation module also connects AMOLED display screen.

The utility model first utilizes low pressure drop voltage stabilizing IC to carry out step-down to the voltage of power supply, re-using STOD03AS voltage transformation module powers for drive plate provides positive/negative-pressure, whole power driving circuit does not need too many discrete component, can use inductor and the ceramic output capacitor of small volume, improving the precision that drives power supply, when reducing noise and loss, make circuit more lightening, integrated; STOD13AS chip adopts Silicon-On-Insulator (SOI) manufacturing process, guarantees that equipment has outstanding efficiency, longer battery.In addition, excellent anti-mobile communication noise performance is guaranteed display screen flicker free, stable performance.The beneficial effects of the utility model are mainly manifested in:

1, few discrete component, makes circuit more lightening, integrated, high precision output;

2, low noise, low-loss, efficiency reaches 85%, contributes to extending battery life;

3, there is excellent anti-mobile communication noise performance, there is the functions such as overheating protection and soft start.

Accompanying drawing explanation:

Fig. 1 is the entire block diagram of the utility model electric power driving module;

Fig. 2 is the circuit diagram of STOD03AS voltage transformation module in the utility model.

Embodiment:

Below in conjunction with specific embodiments and the drawings, the utility model is further illustrated.

As Figure 1-Figure 2, the AMOLED display screen C0240-QGFA-T that the utility model is produced with Taiwan Qi Jing photoelectricity company drives power supply design as an example.

This electric power driving module comprises AMS1117-3.3 voltage transformation module 2, MCU3 and the STOD03AS voltage transformation module 4 being connected with input power 1 respectively, and STOD03AS voltage transformation module 4 comprises STOD03AS direct current conversion chip, inductance L 1 and L2, input filter capacitor C _iN, input end shunt capacitance C _rEF, output filter capacitor C _mIDand C _o2; Groundwork principle is: according to the normal working voltage scope of C0240-QGFA-T AMOLED display 5, first utilizing low pressure drop Voltage stabilizing module 2 is that AMS117-3.3 chip carries out step-down to the voltage of input power 1, AMS1117-3.3 chip is a low dropout voltage regulator that can export 800mA, 5V can be transformed to 3.3V.Processor MCU 3 is given the EN port enable signal of STOD03AS direct current conversion chip, gives S _wIREhold a byte pulse signal to change the negative pressure output of STOD03AS chip; Through STOD03AS, carry out DC-DC conversion, obtain the generating positive and negative voltage that AMOLED display screen C0240-QGFA-T needs.

Two output terminals of described MCU connect respectively the S of STOD03AS direct current conversion chip _wIREport and EN port, one end of described inductance L 1 connects input power, input filter capacitor C _iNand the V of STOD03AS direct current conversion chip _iNPport, the other end connects the V of STOD03AS direct current conversion chip _iNPport L _x1port; One end of inductance L 2 connects the L of STOD03AS direct current conversion chip _x2port, other end ground connection; Two output terminal V of STOD03AS direct current conversion chip _mID, V _o2connect respectively AMOLED display screen; The output terminal of AMS1117-3.3 voltage transformation module also connects AMOLED display screen 5.

Particularly, the EN port of processor MCU low-level enable signal termination STOD03AS, like this gives S _wIREhold a byte pulse signal can change the negative pressure output of STOD03AS.Two Voltage-outputs of STOD03AS are all used high energy efficiency synchronization job, and the total energy effect up to 85% helps prolongation battery; Other electricity-saving functions are included in the autompulse dancing mode of low load decline low-power consumption and power consumption lower than the real shutdown mode of 1uA, can make chip recover normal mode by enable pin (EN).

Inductance L 1 meets two termination V in STOD03AS _iNPand L _x1, L2 meets the L of STOD03AS _x2.Inductance L 1 recommendation is 4.7uH～6.8uH, and the recommendation of L2 is 2.2uH～4.7uH.In selecting inductance process, for fear of saturated, need to calculate the maximum current that inductance can pass through, by following current peak formula, calculate:

$I_{\mathrm{PEAN}-\mathrm{BOOST}}=\frac{V_{\mathrm{MID}}\&times;I_{\mathrm{OUT}}}{\mathrm{\&eta;}1\&times;{\mathrm{VIN}}_{\mathrm{MIN}}}+\frac{{\mathrm{VIN}}_{\mathrm{MIN}}\&times;(V_{\mathrm{MID}}-{\mathrm{VIN}}_{\mathrm{MIN}})}{2\&times;V_{\mathrm{MID}}\&times;\mathrm{fs}\&times;L1}$

（1）

$I_{\mathrm{PEAK}-\mathrm{INVERTING}}=\frac{({\mathrm{VIN}}_{\mathrm{MIN}}-{\mathrm{VO}2}_{\mathrm{MIN}})\&times;I_{\mathrm{OUT}}}{\mathrm{\&eta;}2\&times;{\mathrm{VIN}}_{\mathrm{MIN}}}+\frac{{\mathrm{VIN}}_{\mathrm{MIN}}\&times;{\mathrm{VO}2}_{\mathrm{MIN}}}{2\&times;({\mathrm{VO}2}_{\mathrm{MIN}}-{\mathrm{VIN}}_{\mathrm{MIN}})\&times;\mathrm{fs}\&times;L2}$

（2）

Wherein, η 1=0.70, η 2=0.60, f _s=1.35MHz.

Two output terminal V of STOD03AS _mID, V _o2the output filter capacitor C of the external low ESR of difference _mIDand C _o2, object is the ripple that reduces output in order to improve, the minimum value of electric capacity is 6uF.Consider the tolerance of electric capacity, the situations such as temperature drift, C _mIDthe general electric capacity that specification is 10uF10V, the C of using _o2the electric capacity that general use specification is 20uF10V.Meanwhile, input end adds input filter capacitor C _iNto improve the stability of whole circuit.

More than just the utility model has been carried out to exemplary explanation, specific implementation of the present utility model is not limited to this.The insubstantial modifications that any employing design of the present utility model and technical scheme are carried out, all within protection domain of the present utility model.

Claims (1)

1. the AMOLED display screen electric power driving module based on STOD03AS chip, it is characterized in that: this electric power driving module comprises AMS1117-3.3 voltage transformation module, MCU and the STOD03AS voltage transformation module being connected with input power respectively, wherein, STOD03AS voltage transformation module comprises STOD03AS direct current conversion chip, inductance L 1 and L2, input filter capacitor C _iN, output filter capacitor C _mIDand C _o2; Two output terminals of described MCU connect respectively the S of STOD03AS direct current conversion chip _wIREport and EN port, one end of described inductance L 1 connects input power, input filter capacitor C _iNand the V of STOD03AS direct current conversion chip _iNPport, the other end connects the V of STOD03AS direct current conversion chip _iNPport L _x1port; One end of inductance L 2 connects the L of STOD03AS direct current conversion chip _x2port, other end ground connection; Two output terminal V of STOD03AS direct current conversion chip _mID, V _o2connect respectively AMOLED display screen; The output terminal of AMS1117-3.3 voltage transformation module also connects AMOLED display screen.