TW200423008A - LCD module power supply, LCD module having adjustable voltage and method for adjusting LCD module supplying power - Google Patents

Abstract

LCD module power supply, LCD module having adjustable voltage and method for adjusting LCD module supplying power are provided in the present invention. A power fine adjustment device, an LCD panel, a column driving circuit and a row driving circuit, composes LCD module having adjustable voltage. DC/AC converter and voltage bias fine adjustment circuit composes the power fine adjustment device. A voltage-coupling device is connected with the fifth resistor. The said connection connects the second terminals of plural voltage dividing resistors. Input an adjusting voltage in to the said second terminals to adjust the operation voltage. Therefore, cost is cheaper, adjustment degree is high, all LCD adjustment type power structure could be applied, circuit is simple and easy to control.

Description

200423008 V. Description of the invention (1) TECHNICAL FIELD The present invention relates to a power supply device for a liquid crystal module, a liquid crystal module and method capable of adjusting an operating voltage, and particularly to a portable electronic device. Background of the invention The main requirements for products such as mobile phones, PDAs, and smart phones: or stock machines are low voltage and power saving. Although a few TFT products on the market claim to meet this demand, most of the reflective TFT technology consumes far more power than STN. Traditional monochromatic STN LCDs are used in low-priced models. Due to the colorization of mobile phones and pDA, color STN LCDs are used. Therefore, for portable displays that do not require animation, such as PDAs and mobile phone temples, STN LCDs are the most popular. Can meet the needs of power saving and economic benefits. The reflective STN display can be combined with a front light source to provide the brightness required when the external light source is weak, while the transflective STN display can use the backlight system to assist the lack of ambient light sources. When the ambient light source is sufficient, neither the reflective type nor the transflective type need to use the built-in light source (TΓ〇η · ^ light and back 1 ight) to achieve the effect of power saving. Please refer to the first figure. The conventional liquid crystal module 9 on the market is composed of a boost power supply circuit 90, a liquid 0a display panel 9 3, a column driving circuit 94, and a column driving circuit g5. As shown in the first and second figures, the step-up power supply circuit 90 includes a DC / DC converter (DC / DC converter) 91 and a power supply bias fixing circuit 92. The DC / DC converter 9 丨 is boosted to the voltage required by the liquid crystal module 9. The power supply bias fixing circuit 92 is composed of 5 voltage dividing resistors R91, R92,

200423008 V. Description of the invention (2) The voltage divider circuit composed of R93, R94 and R95 generates working voltages v0, VI, V2, V3, V4 and V5, and working voltages VO, V1, V2, v ^ 2 4 And "is the driving voltage of the liquid crystal display panel 93, which is fixed and cannot be changed. Among them, the column driving circuit 94 uses the working voltages v0, VI, V4, and V5, and the column driving circuit 95 uses the working voltages V0, V2, and V3. , V5. The boost power supply circuit 90 is boosted by the VDD input through the DC / DC converter 91 to generate the working voltage VEE required by the power supply bias fixed circuit 92 as a whole. The fixed circuit 92 is matched and fine-tuned by VcON. Design, manufacturers will count it as an integrated circuit (1C), the long-term disadvantage is that the change circuit is less square iQ, T2, the unit price is more expensive, and it is not easy to replace in use, due to the different specifications N-LCD needs to use different boost power circuits. The output voltage of 909 is inaccurate, and the daily life of ττ T rD is also inconspicuous, so the versatility of the product is very inconvenient. 色 和 Ϊ: 今 ί: In the era of low profit, reducing production costs is important to obtain profits = The manufacturer of the product has to pay close attention to the manufacturing cost. After intensive research by the inventor, the above problems can be solved, and the cost can be greatly reduced. SUMMARY OF THE INVENTION The main object of the present invention is to provide a liquid-day-sun branch set. Power supply device, Bing Bao Kuan · Several voltage-dividing resistors or voltage-dividing components are connected in series and have an eighty-two resistance one end '5th Haidian-the end is electrically connected to the DC power supply' in two adjacent ^ i — 1 working power S is generated between to output to the LCD module,

200423008

A voltage follower device, the second terminal is electrically connected to the operating voltage of the plurality of voltage dividing resistors via the '::'. An adjustment voltage is input at one end to adjust the output. The secondary purpose of the present invention is to solve the above-mentioned problems. A power supply device for a liquid crystal module, a coupling device, and its electric power is mainly at the fifth resistor. Electrically connect a voltage to the second end of the second end to input a plurality of voltage-dividing resistors, which is cheaper and higher by one degree; to adjust the output working voltage, the circuit is simple and easy to control. It is used for all liquid crystals The adjustable power supply architecture is one of the better sound tubes of the present invention. In the above example, the voltage follower device is a voltage follower composed of different amplifier states. Another object of the present invention is to provide a group, which includes: a liquid crystal mold with a reduced operating voltage, a liquid crystal panel, and a driver circuit board; and a substrate and a first generation column to control the number ^ Driving the liquid surface to drive the liquid crystal surface in a row of a driving circuit for generating a column control signal board; a power supply device of a liquid crystal module for providing a working electric circuit and the driving circuit of the column. One output is lost due to adjustment control; The adjustment voltage is adjusted so that the STN-LCD module owned by the power supply of the liquid crystal module greatly reduces the cost. Another purpose of the present invention is to provide a method for adjusting the power supply of the liquid crystal module, which includes The following steps:… 200423008 V. Description of the invention (4) | Provide a first voltage; convert the first voltage into a second voltage; generate a set of output operating voltages in response to the second voltage; and provide an adjustment voltage to adjust This group of output working voltage. Because the adjustment voltage can be set according to different types of liquid crystal modules, other hardware structures do not need to be changed by changing the adjustment voltage, so this method can be applied to all STN-LCD modules. Figure Simple explanation of the number: 1 LCD weight group 11 DC / DC converter 10 power trimming device 12 power bias trimming circuit 121 voltage follower 1211 positive phase input terminal 1212 negative phase input terminal 1213 output terminal 122 voltage-dividing component 1221 first End 1222 second end 13 LCD display panel 14 column drive circuit 15 column drive circuit 9 LCD module «

200423008

V. Description of the invention (5) 90 volt boost power circuit 9 1 DC / DC converter 9 2 power bias fixed circuit 9 3 liquid crystal display panel 94 column driving circuit 9 detailed description of the invention of the 5 column driving circuit: Figures 2 and 4 show the adjustable industrial liquid crystal of the present invention. The module is a power supply trimming device for a liquid crystal module 1. The display panel 1 3, a drive circuit 14, and a row of drive circuits.丨 5 nights as shown the power supply trimming device of the liquid crystal module 1 丨 has DC / DC =, ° 1 and a power supply bias trimming circuit 12. The LCD module! The electrical setting 10 generates a Vcon that can be adjusted according to the type of different STN-LCD panels, and then outputs an adjusted% according to the type of panel & VO, n, V2, V3, V4AV5, t, column The driving operating voltages VG, V1, and V4 are used in the column driving circuit, and the preferred operating voltages VO, V2, V3, and V5 are used, and the output operating voltage is used in the disaster working circuit 14 and the column driving circuit 15. Among them, in the present example, the 'Vcon' is not limited to, but may be about 2 volts. X ~ is not limited to a single liquid crystal panel 3. In the present invention, it is a STN-LCD panel handle, white y color, reflective or transflective STN-LCD. 13 But the power supply bias trimming circuit 1 2 The voltage is coupled with the voltage] 9 β, Yi Yiyi and the voltage divider group]? ? composition. The voltage-dividing component 122 is composed of five voltage-dividing resistors R1, R2 l ^ m κ 〇 R4 and R5.

200423008 V. Description of Invention (6) Composition.纟-In the specific embodiment, the voltage follower of the voltage follower device calculates the voltage follower of the large-scale device. Vcon is turned into a bag of positive-phase input terminal 1211 'Negative voltage follower device 121: consumption = and output 1213 Electrical connection. The voltage is coupled to 奘 and 1212 is connected to resistor R5. The output 1213 electrical voltage-dividing component 122 can be composed of resistors R1, R2, R3, and R4M5. The voltage VEE of the end 1221 is equal to V0. In the ideal operation, the voltage is equal to the output operating voltage V5. Between the output working voltage VI, the output working voltage V2 between R2 and R3, and working with it .. the output working voltage V4 between "MV3, R4 and R5," and "⑽ ^ The working voltage V5 is obtained according to Ohm's law. And adjusting Vcon can stably adjust the output operations VO, VI, V2, V3, V4 and V5 according to Ohm's law. The DC / DC converter 11 is based on the output voltage VEE of a mobile phone or a PDA (Personal Digital Assistant), but is not limited to about 25 volts, and falls between the first end 1221 and the second end 1222 of the voltage dividing component ⑴ 122. The voltage difference between them is equal to VEE minus Vcon. The DC / DC converter 11 of the present invention adopts a voltage converter 'such as L T1 6 1 5' which can be constructed on the market but is not limited to a voltage converter of T 1 6 1 5. See Figure 5 for a method of adjusting the power supply of a liquid crystal module according to the present invention. The method includes the following steps: Step 6 1: Provide a first voltage to the DC / DC converter 11; Step 6 2: Use DC / DC conversion The converter 丨 1 converts the first voltage into the second voltage VEE and outputs it from the DC / DC converter. 丨 丨 Step 63 · A set of output operating power is generated in response to the first voltage VEE

200423008 V. Description of the invention (7) The voltages v0,], V2, V3, V4, and V5; and step 64: provide the adjustment voltage Vcon, and finely adjust the output working voltage v0 V5 of the group. And in step 63 above, generating a voltage VO, vi, V2, V3, V4AV5 due to the second voltage VEE includes the following steps: step] Supply voltage dividing component i 22; Step 632: electrically connect the second voltage to the cough And the first end 1221 of the voltage m; and step 6 33: from the voltage dividing group; 122 output the set of working voltages V0, V1, V2, V3, V4 and “ί ν: step :; in order to provide the adjustment voltage Vc0n, thereby Adjusting the output of the group = 敕 1, V2, V3, V4, and V5 includes the following steps: Step ⑷: Adjust the voltage Vcon to the voltage divider 122 and the voltage coupling device 121; Step 642: Adjust the voltage Vc. n is input to the voltage follower to generate the adjustment voltage Vcon (because the input is equal to the output); and step 643: input the adjustment voltage Vcon to the second terminal 1 222 of the voltage dividing component 122 to adjust This group outputs working voltages V0, V1, V2, V3, V4, and V5. Compared with the prior art, the specific advantages of the present invention can reduce production costs by 8-10%.

Page 10 200423008 Brief description of the drawings Brief description of the drawings: The first diagram is a schematic diagram of a conventional liquid crystal module. The second figure is a detailed circuit diagram of a conventional boost power circuit. The third figure is a schematic diagram of a liquid crystal module of the present invention. The fourth figure is a detailed circuit diagram of the power supply trimming device of the liquid crystal module of the present invention. The fifth figure (a), the fifth figure (b) and the fifth figure (c) are flowcharts of the method for adjusting the power supply of the liquid crystal module according to the present invention.

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Claims (1)

200423008 6. Scope of patent application Patent scope · 1. A power supply device for a liquid crystal module, comprising: a plurality of voltage dividing resistors, connected in series, having a first end and a second end, the first end is electrically connected To the DC power source, an output working voltage is generated between two adjacent voltage dividing resistors to output to the liquid crystal module; a voltage follower device is electrically connected to the second end of the plurality of voltage dividing resistors, An adjustment voltage is input to the second terminal to adjust the output working voltage. 2. For example, the power supply device for the liquid crystal module of the first scope of the patent application, wherein the voltage follower device is a voltage follower including an operational amplifier ° 3. If the first scope of the patent application is The power supply trimming device group of the LCD module further includes a converter as a DC power supply for boosting an input voltage as the DC power supply. 4. For the power supply device of the liquid crystal module according to item 4 of the patent application scope, wherein the transformer is a DC / DC transformer (D C / D C c ο n v e r t e r). 5. The power supply device for the liquid crystal module as described in the first patent application, wherein the liquid crystal module is an STN-LCD module. 6. A liquid crystal module capable of adjusting the working voltage, comprising: a liquid crystal panel including a first substrate, a second substrate and a liquid crystal layer; a column driving circuit for generating a column control signal for the column Driving the liquid crystal panel; a column driving circuit for generating column control signals to drive the liquid crystal surface in columns Page 12 200423008 VI. Patent application board; Yu i ί: G Ϊ:: 1 :: Power supply device of the dynamic night crystal module, the liquid crystal module with adjustable working voltage around the first item is used. The power supply split includes: a plurality of voltage dividing resistors, connected in series with a first total lightning, having a first end and a second end, the input ttj JL # φ P 5 Hai DC power supply, in two adjacent An output-working voltage is generated between the piezoresistors to output to the liquid crystal module; the first-terminal H is lightly split and is electrically connected to the two or two-terminal inputs of the plurality of voltage-dividing resistors to adjust the voltage to Adjust the output liquid crystal module application; the electronic device with adjustable operating voltage of item 7 (;. 2 == is… 9 its Ϊ t: the liquid crystal module with adjustable operating voltage of item 7 of the patent scope, input The tp converter is used as a DC power supply, which is used to boost a voltage as the DC power supply. The power supply device of the liquid crystal module of item 9 of the patent application / month patent, whose 11 is Γ k voltage The converter is a direct current / direct current transformer (DC / DC converter). The 7th scope of patent application scope A liquid crystal module with adjustable working voltage, the liquid crystal panel is an STN-LCD panel. A power supply device for a liquid crystal module includes: — a converter (converter) for converting a first voltage into a brother and a voltage An end pressure assembly having a first end and a second end, the first Page 13 200423008 6. The scope of the patent application is electrically connected to the transformer to generate a set of output operating voltages in response to the second voltage to output to the liquid crystal module; and a voltage follower device, which is electrically connected to the The second end of the plurality of voltage-dividing resistors, and by providing an adjustment voltage, to adjust the set of output working power m 0 3 1 · The power supply device according to item 12 of the scope of patent application, wherein the knife pressure The module is made up of a plurality of voltage dividers (1 and household weights in series. 1 4) The power supply device according to item 13 of the scope of patent application, wherein two adjacent voltage divider resistors are employed separately. An output working voltage. 15. A method for adjusting the power supply of a liquid crystal module includes the following steps: (a) providing a first voltage; '... (b) converting the first voltage to a / second voltage; ( c) A set of output operating voltages is provided to the Hai Hai LCD module in response to the second voltage; and (d) An adjustment voltage is provided to adjust the set of output operating voltages. 5 notes A method for supplying power to an entire liquid crystal module, wherein step (c) includes the following steps: providing a component voltage assembly; ^ electrically connecting the second voltage to a first end of the voltage division component; and The voltage-dividing component outputs the group 17 · The method as described in item 15 of the scope of patent application, wherein step (d) further outputs the working voltage. Adjusting the power supply of the liquid crystal module includes the following steps: 200423008 Page 15