CN202189542U - Adjunct circuit of liquid crystal display module - Google Patents
Adjunct circuit of liquid crystal display module Download PDFInfo
- Publication number
- CN202189542U CN202189542U CN2011203191500U CN201120319150U CN202189542U CN 202189542 U CN202189542 U CN 202189542U CN 2011203191500 U CN2011203191500 U CN 2011203191500U CN 201120319150 U CN201120319150 U CN 201120319150U CN 202189542 U CN202189542 U CN 202189542U
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- triode
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- resistance
- lcd module
- power supply
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- Liquid Crystal Display Device Control (AREA)
Abstract
The utility model discloses an adjunct circuit of a liquid crystal display module, which at least comprises a diode (D1), a capacitor (C1), a first resistor R1 and two cascaded triodes (T1) and (T2). The diode (D1) and the capacitor (C1) are connected in series and connected between an electric power supply and the ground in series. A base of a primary triode (T1) of a cascade circuit of the two triodes is connected with the electric power supply in series, a collector of a secondary triode (T2) of the cascade circuit of the two triodes the is connected with a driving power supply of a driver on the liquid crystal display module in series, a collector of the primary triode (T1) and a base of the secondary triode (T2) are simultaneously connected with the first resistor (R1) in series, and the other end of the first resistor (R1) is connected to the cathode of the diode (D1). The scheme achieves releasing of voltage charges of remaining voltage through conducting of the secondary triode (T2) during sudden power failure so as to remove black lines and remaining images on the liquid crystal display module when the electric power supply of the liquid crystal display module is cut and enable a user of a liquid crystal display device to have better visual perception.
Description
Technical field
The utility model relates to a kind of adjunct circuit of LCD MODULE, particularly a kind of circuit that is attached in the LCD MODULE driving circuit.
Background technology
The available liquid crystal display module is in the use that is installed to the LCD circuitry; The action that the general detection of the master controller of LCD complete machine is closed less than power supply when power supply is closed suddenly; In case this can not control the driver of LCD MODULE with regard to quitting work with regard to causing power supply to close master controller again; Simultaneously after power supply is closed suddenly; Because very high the having little time of the remaining voltage of driver discharges on the LCD MODULE, uncertain ghost in position or black line will on display screen, occur, influences user's visual experience.
The utility model content
The utility model provides a kind of miniwatt discharge circuit, bad demonstration phenomenons such as the ghost that elimination causes when closing suddenly because of power supply, black line.
The adjunct circuit of the LCD MODULE that provides based on above-mentioned purpose the utility model comprises: the triode of a diode, an electric capacity, a resistance and two mutual cascades at least.
The positive pole of described diode is connected in series with power supply, negative pole and said capacitance series, the other end ground connection of said electric capacity;
Described two triode cascades; And the base stage of elementary triode is connected in series with power supply; The driving power of driver is connected in series on the collector of secondary triode and the LCD MODULE; The collector of described elementary triode and the base stage of secondary transistors are connected in series with said resistance simultaneously, and the other end of said resistance is connected to the negative pole of said diode, described two triodes penetrate a grade equal ground connection.
Saidly can find out that from top the adjunct circuit of the LCD MODULE that the utility model provides when the LCD MODULE operate as normal, forms between driving power and the ground and opens circuit, to not influence of normal demonstration; When power down takes place suddenly, form path between driving power and the ground, the remaining voltage with driver on the LCD MODULE discharges rapidly, eliminates bad demonstration phenomenon.
Bad demonstration phenomenons such as the ghost that LCD MODULE occurs, black line have been eliminated in the design of the LCD MODULE adjunct circuit through the utility model invention when power supply is closed.
Description of drawings
Synoptic diagram when Fig. 1 is the embodiment 1 circuit operate as normal of the utility model;
Synoptic diagram when Fig. 2 is the embodiment 1 circuit sudden power of the utility model;
Synoptic diagram when Fig. 3 is the embodiment 2 circuit operate as normal of the utility model;
Synoptic diagram when Fig. 4 is the embodiment 2 circuit sudden power of the utility model;
Synoptic diagram when Fig. 5 is the embodiment 3 circuit operate as normal of the utility model;
Synoptic diagram when Fig. 6 is the embodiment 3 circuit sudden power of the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to the utility model further explain.
With reference to figure 1 and Fig. 2, be the synoptic diagram of the utility model embodiment 1.
Fig. 1 is the circuit diagram of LCD MODULE adjunct circuit under normal mode of operation of embodiment 1.
Wherein, VDD is the power supply of LCD MODULE, and the positive pole of diode D1 is connected in series with power supply VDD, and the negative pole of diode D1 is connected in series with capacitor C 1, and the other end of capacitor C 1 is connected in series with ground VSS.Two triode T1 and T2 cascade, the base stage of the collector of said elementary triode T1 and secondary triode T2 is connected in series with said first resistance R 1 simultaneously, and the other end of said first resistance R 1 is connected to the negative pole of said diode D1.The base stage of elementary triode T1 is connected in series with power supply VDD.Therefore power supply VDD provides operate as normal required voltage to LCD MODULE the time, so module is in normal operating conditions, and the collector of secondary triode T2 is connected in series with driving power V0.The level of penetrating of two triode T1 and T2 is connected in series with ground VSS.
Fig. 2 is the circuit diagram of LCD MODULE adjunct circuit under the sudden power pattern of embodiment 1.
At this moment; The power supply VDD of module is cut off suddenly; Therefore no longer include power supply VDD and driving power V0 in the circuit, and, because the capacity effect of liquid crystal pixel self in the LCD MODULE; When causing LCD MODULE sudden power state, produced remaining voltage V1 at former driving power V0 place.
In Fig. 1; During the module operate as normal; Power supply VDD charges to capacitor C 1 through diode D1; Simultaneously the base stage of elementary triode T1 with penetrate inter-stage and apply forward bias voltage, this moment, power supply VDD also was connected to the collector of elementary triode T1, therefore elementary triode T1 conducting through diode D1 via first resistance R 1.And, do not reach the forward voltage of PN junction because the base stage of secondary triode T2 and the voltage of penetrating inter-stage equal the collector and the voltage of penetrating inter-stage of elementary triode T1 at this moment, so secondary triode T2 ends at this moment.The driving power V0 of liquid crystal display mode block drive is not influenced by any of this discharge circuit.
In Fig. 2, when power supply VDD closed suddenly, power supply VDD no longer provided voltage, but capacitor C 1 charging during through operate as normal, can provide certain energy this moment, can regard a power supply as, and its voltage approximates the voltage of power supply VDD.Because power supply VDD can not provide voltage, elementary triode T1 ends.The voltage that capacitor C 1 provides is added to the base stage of secondary triode T2 through first resistance R 1; At this moment; Secondary triode T2 conducting; The remaining voltage V1 of driver discharges remaining voltage V1 electric charge promptly through triode T2 and ground VSS conducting fast on the LCD MODULE at this moment, thereby avoids the appearance of bad demonstration phenomenon.
With reference to figure 3 and Fig. 4, be the synoptic diagram of the utility model embodiment 2.
Fig. 3 is the circuit diagram of LCD MODULE adjunct circuit under normal mode of operation of embodiment 2.
Wherein, VDD is a power supply, and the positive pole of diode D1 is connected in series with power supply VDD, and the negative pole of diode D1 is connected in series with capacitor C 1, and the other end of capacitor C 1 is connected in series with ground VSS.Two triode T1 and T2 cascade, the base stage of the collector of said elementary triode T1 and secondary triode T2 is connected in series with first resistance R 1 simultaneously, and the other end of first resistance R 1 is connected to the negative pole of said diode D1.The base stage of elementary triode T1 is connected in series with power supply VDD through second resistance R 2, and simultaneously, the base stage of elementary triode T1 is connected in series with ground VSS through the 3rd resistance R 3.Therefore power supply VDD provides operate as normal required voltage to LCD MODULE the time, so module is in normal operating conditions, and the collector of secondary triode is connected in series with driving power V0 through the 4th resistance R 4.Elementary triode T1 penetrate level through the 5th resistance R 5 be connected in series, penetrating of secondary triode T2 grade is connected in series with ground VSS through the 6th resistance R 6.
Fig. 4 is the circuit diagram of LCD MODULE adjunct circuit under the sudden power pattern of embodiment 2.
Similar with circuit theory shown in Figure 2; At this moment, the power supply VDD of module is cut off suddenly, so no longer includes power supply VDD and driving power V0 in the circuit; And; Because the capacity effect of liquid crystal pixel self when causing the LCD MODULE off-position, has produced remaining voltage V1 at former driving power V0 place in the LCD MODULE.
In Fig. 3; During the module operate as normal; Power supply VDD charges to capacitor C 1 through diode D1; Simultaneously through second resistance R 2 and the 3rd resistance R 3 the base stage of elementary triode T1 with penetrate inter-stage and apply forward bias voltage, this moment, power supply VDD also was connected to the collector of elementary triode T1 so triode T1 conducting through diode D1 via first resistance R 1.And, do not reach the forward voltage of PN junction because the base stage of secondary triode T2 and the voltage of penetrating inter-stage equal the collector and the voltage of penetrating inter-stage of elementary triode T1 at this moment, so secondary triode T2 ends at this moment.The driving power V0 of LCD MODULE is not influenced by any of this discharge circuit.
In Fig. 4, when power supply VDD closed suddenly, power supply VDD no longer provided voltage, but capacitor C 1 charging during through operate as normal, can provide certain energy this moment, can regard a power supply as, and its voltage approximates the voltage of power supply VDD.Because power supply VDD can not provide voltage, elementary triode T1 ends.The voltage that capacitor C 1 provides is added to the base stage of secondary triode T2 through first resistance R 1, at this moment, and secondary triode T2 conducting; The remaining voltage V1 of driver on this moment LCD MODULE; Promptly through the 4th resistance R 4, via secondary triode T2 and the 6th resistance R 6, with ground VSS conducting; Fast remaining voltage V1 is discharged, thereby avoid the appearance of bad demonstration phenomenon.
Can find out, reach adjustment, can play the effect of restriction and adjusting, realize the scheme of the utility model better the electric current and voltage of each link in the circuit to resistance through the resistance that is increased among the embodiment.
With reference to figure 5 and Fig. 6, be the synoptic diagram of the utility model embodiment 3.
Fig. 5 is the circuit diagram of LCD MODULE adjunct circuit under normal mode of operation of embodiment 3.
Wherein, VDD is a power supply, and the positive pole of diode D1 is connected in series with power supply VDD, and the negative pole of diode D1 is connected in series with capacitor C 1, and the other end of capacitor C 1 is connected in series with ground VSS.Two field effect transistor Q1 and Q2 cascade, the grid of the source electrode of said primary field effect transistor Q1 and secondary field effect transistor Q2 is connected in series with first resistance R 1 simultaneously, and the other end of said first resistance R 1 is connected to the negative pole of said diode D1.The grid of primary field effect transistor Q1 is connected in series with power supply VDD.Therefore power supply VDD provides operate as normal required voltage to LCD MODULE the time, so module is in normal operating conditions, and the source electrode of secondary field effect transistor Q2 is connected in series with driving power V0.The leakage level of two field effect transistor Q1 and Q2 is connected in series with ground VSS.
Fig. 6 is the circuit diagram of LCD MODULE adjunct circuit under the sudden power pattern of embodiment 3.
Similar with circuit theory shown in Figure 2; At this moment, the power supply VDD of module is cut off suddenly, so no longer includes power supply VDD and driving power V0 in the circuit; And; Because the capacity effect of liquid crystal pixel self when causing the LCD MODULE off-position, has produced remaining voltage V1 at former driving power V0 place in the LCD MODULE.
Can from Fig. 5, find out, two mutual cascades of field effect transistor, primary field effect transistor Q1 and secondary field effect transistor Q2 replace elementary triode T1 and the secondary triode T2 among Fig. 1 respectively.Because of the principle of work of field effect transistor and triode is similar, can find out obviously among Fig. 1 that the principle of work of circuit is also similar in the circuit and Fig. 5, in like manner, the circuit working principle of Fig. 6 and Fig. 2 is also similar.Just when making field-effect transistors substitute triode, can make circuit working more stable, reaction velocity is sensitive more.In like manner, triode T1 among Fig. 3, Fig. 4 and T2 also can substitute with two field effect transistor Q1 and Q2 respectively, can realize the required technique effect that reaches of this utility model equally.
In addition; The those of ordinary skill in affiliated field is to be understood that: the above is merely the specific embodiment of the utility model; Be not limited to the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (8)
1. the adjunct circuit that can eliminate the LCD MODULE of bad demonstration when cutting off the electricity supply is characterized in that,
At least the positive pole that comprises a diode (D1), an electric capacity (C1), first resistance (R1), said diode (D1) is connected in series with the power supply of LCD MODULE, and negative pole is connected in series with electric capacity (C1), the other end ground connection of said electric capacity (C1);
At least the cascade circuit that comprises two triodes; The base stage of its elementary triode (T1) is connected in series with the power supply of LCD MODULE; The driving power of driver is connected in series on the collector of its secondary triode (T2) and the LCD MODULE; The base stage of the collector of said elementary triode (T1) and secondary triode (T2) is connected in series said first resistance (R1) simultaneously, and the other end of said first resistance (R1) is connected to the negative pole of said diode (D1), described two triodes penetrate a grade equal ground connection.
2. LCD MODULE adjunct circuit according to claim 1 is characterized in that, between the base stage of elementary triode (T1) and power supply, is connected in series second resistance (R2).
3. LCD MODULE adjunct circuit according to claim 1 is characterized in that, between the base stage of elementary triode (T1) and ground, is connected in series the 3rd resistance (R3).
4. LCD MODULE adjunct circuit according to claim 1 is characterized in that, collector series connection the 4th resistance (R4) of secondary triode (T2), and the other end of described the 4th resistance (R4) is serially connected on the driving power of liquid crystal display mode block drive.
5. LCD MODULE adjunct circuit according to claim 1 is characterized in that, between the emitter-base bandgap grading of elementary triode (T1) and ground, is connected in series the 5th resistance (R5).
6. LCD MODULE adjunct circuit according to claim 1 is characterized in that, between the emitter-base bandgap grading of secondary triode (T2) and ground, is connected in series the 6th resistance (R6).
7. LCD MODULE adjunct circuit according to claim 1 is characterized in that, between the base stage of elementary triode (T1) and power supply and between the base stage of elementary triode and the ground, is connected in series second resistance (R2) and the 3rd resistance (R3) respectively; Collector series connection the 4th resistance (R4) of secondary triode (T2), the other end of the 4th resistance (R4) is serially connected on the driving power of liquid crystal display mode block drive; Elementary triode (T1) penetrate level through the 5th resistance (R5) be connected in series, secondary triode (T2) penetrate grade through the 6th resistance (R6) be connected in series.
8. LCD MODULE adjunct circuit according to claim 1 is characterized in that, said elementary triode (T1) and secondary triode (T2) can substitute with two field effect transistors respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203191500U CN202189542U (en) | 2011-08-29 | 2011-08-29 | Adjunct circuit of liquid crystal display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203191500U CN202189542U (en) | 2011-08-29 | 2011-08-29 | Adjunct circuit of liquid crystal display module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202189542U true CN202189542U (en) | 2012-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203191500U Expired - Fee Related CN202189542U (en) | 2011-08-29 | 2011-08-29 | Adjunct circuit of liquid crystal display module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202189542U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766385A (en) * | 2018-08-29 | 2018-11-06 | 广东长虹电子有限公司 | A kind of shadow circuit that disappears of screen TCON plates |
| CN110912248A (en) * | 2019-12-11 | 2020-03-24 | 国网山东省电力公司济南供电公司 | Temperature sensor energy storage circulation power supply system |
-
2011
- 2011-08-29 CN CN2011203191500U patent/CN202189542U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766385A (en) * | 2018-08-29 | 2018-11-06 | 广东长虹电子有限公司 | A kind of shadow circuit that disappears of screen TCON plates |
| CN110912248A (en) * | 2019-12-11 | 2020-03-24 | 国网山东省电力公司济南供电公司 | Temperature sensor energy storage circulation power supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 065001 No. 2, road 36, economic and Technological Development Zone, Hebei, Langfang Patentee after: Ji ya (Langfang) electronic Limited by Share Ltd Address before: 065001 No. 2, road 36, Langfang economic and Technological Development Zone, Hebei Patentee before: Hebei Jiya Electronics Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120411 Termination date: 20190829 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |