TW546900B - Multi-power supply device of LCD - Google Patents

Abstract

There is provided a multi-power supply device of LCD, suitable for outputting DC power with multiple voltage values to liquid crystal display based on AC power, which includes the following components. A power adapter is provided for receiving AC power and outputting DC power with a predetermined voltage value. A first impedance device has a first predetermined impedance, and one end thereof is coupled to the power adapter. A second impedance device has a second predetermined impedance, and one end thereof is coupled to the other end of the first impedance device. The voltage level at one end of the second impedance device is lower than a predetermined voltage value. A third impedance device has a third predetermined impedance, and one end thereof is coupled to the other end of the second impedance device. The other end of the third impedance device is coupled to the ground level. The voltage level at one end of the third impedance device is between the voltage level at one end of the second impedance device and the ground level.

Description

546900 V. Description of the invention (1) The present invention relates to a multi-power supply..e. A multi-power supply device for providing liquid crystal display operation = 2, 疋 / 疋 β. Power with different voltage values ^ HHUUuid crystal dispUy, hereinafter referred to as a car ;: a flat-panel display with low power consumption = and; Γ voltage driving and other features, can be applied to personal electrical power Navigation displays, navigation systems, musical instruments, projectors, viewfinders, and portable devices in daily life, such as electronic computers and televisions, are used for display. In the power supply of the LCD, it is necessary to connect a power supply with a voltage value for the internal components of the LCD. The: m system is used to supply the power supply circuit of the internal components of the LCD. 、 And σ are as shown in Figure 1 of the first reference. Figure f1 shows the power supply circuit of a conventional LCD. Periodic VJ, ': The chip 10 is a pulse width modulation 11 ′ can output the cycle = 2 The driving chip 10 can adjust the frequency of the output square wave. Next ’# Read circuit block 12 12 has a diode 12 ι, a square wave Is rectifier of the dagger. The periodic capacitor 122 output from the moving boat 10 is charged by the signal Is passing through the diode 121. Because the periodic square wave 13 output from the driving chip 10 is Micro Motion passing through the diode 121 and charging the capacitor 122, the capacitor 122 becomes two; the noise of the voltage gradually increases from 0 volts until it reaches a predetermined voltage value. For example, V1: In addition: From the existing voltage value V1, the required electric power can be achieved by adjusting the frequency of the periodic square wave Is outputted by the driving chip 10 and the width of the positive pulse. 6404TWF; MIC90-043; Rober tp td 546900 V. Description of the invention (2) For example, 8V However, the voltage across the valley 122 will still be affected by the 晶片 § number I s output from the driver chip, that is, when the signal I When s changes from a high level to a low level, the cross-voltage at the ends of Fudian Valley 1 2 2 will change. In order to make the output voltage 0 more stable, the circuit block 12 is additionally provided with an inductor 123 and a capacitor 1 2 4. The inductor 1 2 3 can slowly charge the capacitor 1 2 4 to a voltage value VI and make the output terminal 126 known. The output voltage can be more stable without being affected by the signal level switching. In addition, the energy stored in the capacitor 122 will continue to charge the capacitor 142 via the diode 45 and the diode 141, so that the voltage value of the capacitor 142 reaches vi. At the same time, the driving chip 10 continues to output the periodic square wave ls to the capacitor 142 and charges the capacitor 142, so that the voltage value of the capacitor 142 gradually increases. The voltage value of the capacitor 142 is increased from ¥ 1, so the result of charging the electric valley 142 at the signal ^ will make the voltage across the capacitor 丨 42 doubled "and output 2 times at the output terminal 146 VI voltage. In the same way, three times the voltage value of VI can be generated in the above manner, and the output terminal 166 outputs three times the voltage. Among them, the operation modes of the circuit blocks 14 and 16 are similar to those of the circuit block 12, and will not be repeated here for brevity. The method of generating the -V1 voltage is as follows: When the periodic square wave 13 output from the driving chip 10 is at a high level, the capacitor 181 can be charged. At this time, the voltage level of 18U at one end of the capacitor is at the voltage level of 181B at the other end of the capacitor. When the signal is changed from the high level to the low level (0V), the voltage level of the other 181B of the capacitor is still lower than the voltage of one terminal 18 of the capacitor due to energy conservation. For the capacitor 183, the It is charged by the negative voltage input from the other end of the capacitor 181β, so that the voltage across the capacitor 183 reaches _V1. As a result, 546900 V. Description of the invention (3) '----- The output terminal outputs -VI voltage value. Two *: The traditional power supply circuit described in Fig. 1 can provide power for LCD's including VI, 2 times V1, 3 times ¥ 1, and 1n. However, the above: In the m supply circuit, a large number of diodes and capacitors must be used: lcdH to the top function 'will not only increase the manufacturing cost, i will indirectly cause the LCD volume to increase, and the traditional display technology must be improved. In view of this, in order to solve the above problems, the main purpose of the present invention is to provide an LCD power supply circuit. For V1 required by the LCD during operation, = necessary and == power requirements, * need to be a conventional power supply The circuit element can be effectively extracted during operation, in order to achieve the purpose of the past, the present invention proposes a liquid crystal display 5 | Duo Lei Ϊ: Ϊ U1 is suitable for outputting direct voltage AC power with multiple voltage values according to AC power and output The existing source adapter has the first-predetermined resistance of the receiver; that is, the power supply. The -impedance element reactance element has the second predetermined resistance W '# of the second resistance, _ #, the impedance level is coupled to the voltage level of one end of the impedance element of the first impedance element and the impedance element. Lower than established

Kri ;, the component has a third predetermined impedance, its -end surface is connected to the other of the first impedance element, two one is at the ground potential, and the above 苐 r: the other end is lightly connected to the second impedance element— The voltage level of terminal = ::: 1 is between the voltage level of ^ and the ground potential. Brief description of the schema:

546900 V. Description of the Invention (4) In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to make a detailed description as follows: Figure 1 shows the power supply circuit of a conventional LCD. Fig. 2 shows an LCD power supply circuit according to an embodiment of the present invention. Fig. 3 shows an L C D power supply circuit generating a voltage of -8 V according to an embodiment of the present invention. Explanation of symbols: 10 > 30 12 121 122 126 141 20〃 22 210 28 ^ 35 ^ R1 Is ^ 14 Driver chip 16 ~ Circuit block ^ Diode 31, 33, 37 ~ Capacitor, 123, 124, 142, 181, 183, 146, 166, 210 ~ output, 1 4 5 ~ diode power adapter 24, 26 ~ impedance element, 2 3 0, 2 5 0 ~ connection point op amp inductor R2, R3 ~ impedance period signal

0506-6404TWF; MIC90-043; Rober t.p t d page 7 546900 V. Description of the invention (5) AC ~ AC power source DC ~ DC power source Example:

Referring to FIG. 2, FIG. 2 shows an LCD power supply circuit according to an embodiment of the present invention. As shown in FIG. 2, the LCD power supply circuit according to the embodiment of the present invention has a power adapter (adapte: r) 20, which receives an AC power source AC and outputs a DC power source redundancy with a predetermined voltage value. It is assumed that in this embodiment, the voltage values to be generated by the LCD power supply circuit are 8V, 16V, 24V, and -8V, respectively. Therefore, the voltage value of the DC power output from the power adapter 20 at the output terminal 210 is 24V (3V2). The impedance element 22 ′ has a first predetermined impedance R1 and is coupled to the power adapter 20. The impedance element 24 'has a second predetermined impedance R2, and is coupled to the impedance element 22. Due to the voltage drop caused by the impedance of the impedance element 24 itself, the voltage level of the connection point 230 between the impedance element 22 and the impedance element 24 is lower than 24V. The impedance element 26 has a third predetermined impedance R3 and is coupled between the impedance element and a ground level. Due to the voltage drop caused by the impedance of the impedance element 26 itself, the voltage level at the connection point 25 of the impedance element 26 and the impedance element 24 is lower than the connection

The voltage level output by point 230. In this embodiment, the impedance elements 22, 24, and 26 may be resistors. In addition, 'in order to stabilize the voltage of the LCD power supply f 7 output according to the embodiment of the present invention', this embodiment provides a complex operational amplifier 28 as a buffer, which is respectively coupled to the output terminal 2, the connection point 23 and the connection. Point 0 'can provide a more stable output voltage value.

0506-6404TW; MIC90-043; Robert.ptd Page 8 546900 V. Description of the invention (6) Resistive resistance 2: Shi 2: The LCD power supply circuit described above, by adjusting the electricity by two dollars a ^ The impedance values of 24 and 26 can be lower than the output voltage of the power adapter 20 at the output terminals 2 and 10 according to the voltage dividing law. For example, if you want to generate 8V, i6V and 2 ^ of the electric two-Γ, p and the impedance components 22, 24, 26 are set to the phase impedance value, and the DC power voltage value output by the terminal 21Q is 24V (3V2). The iDC power supply voltage output from the output terminal 2 10 is evenly distributed on the impedance element 26. As a result, the value of the voltage output from the connection point 230 is J6V (V6), and the value of the voltage output from the connection point 250 is 8V (V2). ^ Please refer to FIG. 3, which shows an LCD power supply circuit for generating voltage according to an embodiment of the present invention. As shown in Fig. 3, with the drive:, a periodic square wave Is is generated. When the periodic wave output from the driving chip 30 is at a high level, the capacitor 31 can be charged. At this time, the voltage level of 31A at one end of the capacitor is toward the voltage level of 31B at the other end of the capacitor. When the signal Is changes from the same level to the low level (0v), the voltage level of 31 1B at the other end of the capacitor 31 is still lower than the voltage level of 31 A at one end of the capacitor 31 due to the energy balance. Therefore, for the capacitor 33, the negative voltage output by the other end \ 1B of the capacitor is charged, so that the voltage across the capacitor 33 is a negative voltage (relative to the ground point). #To adjust the voltage across the capacitor 33, the value can be adjusted by adjusting the frequency of the periodic square wave I s or the width of the positive pulse output by the driving chip 3 〇 and the variable resistor 35 to achieve the required value. Voltage value -V2. Finally, “inductance 35 and electric wave crossing and rectification” can output a stable negative voltage V2. According to the LCD power supply circuit according to the embodiment of the present invention, it can be connected to m 0506-6404TW; MIC90-043; Robert t. Ptd 546900 5. Description of the invention (7) The LCD does not need to be operated as traditional The LCD; = 2 states and the power requirements, you can right from the power supply to the original supply circuit requires a large number of circuits Yuan Ertang for the voltage required for the LCD operation, thereby reducing the liquid day is not for power supply Circuits *, taxis, and evenings have extra space from Ye Jingxian. And the cost 'and reduce unnecessary circuit components. Although the present invention is disclosed in the preferred embodiment as above, the scope of the present invention is not limited. Anyone who learns this Jg is limited by W ^.,, ^ N ... Artists, without departing from the spirit and scope of this level, should be able to make a few changes and retouching. Therefore, the margin of protection shall be as defined in the appended patent scope. Mingzhi 0506-6404TWF; MIC90-043; Rober t.p t d p.10

Claims (1)

546900 VI. Patent application range: DC power supply that outputs multiple voltage values to current sources with a single power supply, including a liquid crystal display multi-power supply device, suitable for L m, = ^ ... 1 'one by one. Including: Power supply An adapter for receiving the above-mentioned AC power source and the above-mentioned DC power source with a predetermined voltage value; μ-out has a first-first impedance element having a first predetermined impedance, and one end of the upper part is coupled to the above-mentioned power adapter; Yiyi has an impedance and a second impedance element, and has a second impedance. One end of the upper element is coupled to the other end of the first impedance element, and the voltage level of one end of the second impedance second impedance element. Lower than both the above-mentioned and the above-mentioned voltage values;-the third impedance element has a third predetermined impedance, and one end of the element is coupled to the other end of the third impedance element and the third impedance element Is coupled to the ground potential, =, and the voltage level at one end of the anti-jamming element is located between the voltage level of the second resistance and the third resistance and the ground potential. What is the percentage of the number of pieces? 2. The liquid w application device as described in item 丨 of the patent application scope 1 includes a complex operational amplifier, are they not coupled? Power supply resisting element, second impedance element, and third impedance element: the first impedance of the second earth 3. Such as the scope of the patent application. In the application device, the impedance values of the first predetermined impedance and the second multi-power supply impedance are approximately the same. No impedance, and the third 4. The liquid crystal application device described in item 3 of the scope of the patent application 'wherein the electric impedance of one end of the second impedance element mentioned above is two 0506-6404TWF; MIC90-043; Robe r tp td 546900 6. Two thirds of the set voltage value for patent application. 5. The liquid crystal display multi-power supply device according to item 4 of the scope of patent application, wherein the voltage level at one end of the third impedance element is 1/3 of the predetermined voltage value. 6 · The liquid crystal display multi-power supply device according to item 5 of the scope of the patent application, wherein the first impedance element, the second impedance element, and the third impedance element are resistors. 7. The multi-power supply device for a liquid crystal display according to item 5 of the scope of patent application, further comprising: a driving transistor for outputting a periodic signal; a first capacitor coupled to the driving transistor and receiving the above A signal and a charge; a diode having a negative terminal coupled to the capacitor and an extreme terminal; and a second capacitor, although one of the terminal and the ground point, is coupled between the positive capacitor and used to output a Negative voltage.