CN103810974B - A kind of color liquid crystal display control circuit and air-conditioner - Google Patents
A kind of color liquid crystal display control circuit and air-conditioner Download PDFInfo
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- CN103810974B CN103810974B CN201210456900.8A CN201210456900A CN103810974B CN 103810974 B CN103810974 B CN 103810974B CN 201210456900 A CN201210456900 A CN 201210456900A CN 103810974 B CN103810974 B CN 103810974B
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Abstract
The present invention is applicable to show control field, a kind of color liquid crystal display control circuit and air-conditioner are provided, described circuit includes black-and-white crystal plate, it is located at the color backlights bottom described black-and-white crystal plate and drives described black-and-white crystal plate and the control unit of color backlights, described color backlights at least includes the colored electric lamp bulb of a kind of color, the colored electric lamp bulb of described each color is respectively connected with synchronization change-over circuit, the input of described synchronization change-over circuit is connected to the color control output end of described control unit, the public output of the described control unit common port that be connected to described black-and-white crystal plate corresponding with segment encode control output end and segment encode control end, the public output poll switching output of described control unit, while switching output, the simultaneously refreshed output in segment encode control output end and color control output end of control unit.The present invention uses relatively low cost to achieve color liquid crystal display control, can be widely used in by this circuit on the product sensitive to price comparison.
Description
Technical field
The invention belongs to show control field, particularly relate to a kind of color liquid crystal display control circuit and air-conditioner.
Background technology
nullIn household electrical appliances display screen scheme，The liquid crystal display used at present is usually black-and-white crystal display mode，The non-dot matrix color liquid crystal of low cost is the development trend in this field，But the present non-commonly used modular manner of dot matrix color liquid crystal，Use color liquid crystal managing chip，Connected mode is as shown in Figure 1，MCU is by communication interface and Special colored liquid crystal managing chip communications such as SPI，Color liquid crystal managing chip is according to receiving the idsplay order that MCU sends，Drive liquid crystal that respective field is shown，Simultaneously drive the color of backlight output liquid crystal display field，Although effect is pretty good，But being because color liquid crystal managing chip is specific customization，On the high side，In some low-end products，Have only to simple non-dot matrix chromatic liquid crystal screen，This series products needs the segment encode quantity shown few，The color needing display is also few，If basic 8 kinds of colors just can meet requirement uses color LCD module，If using special color liquid crystal managing chip，Product cost can be increased.
Summary of the invention
In view of the above problems, it is an object of the invention to provide a kind of color liquid crystal display control circuit, it is intended to solve available liquid crystal colour displaying scheme needs relatively costly Special colored liquid crystal managing chip, add the technical problem of manufacturing cost.
Color liquid crystal of the present invention display control circuit includes black-and-white crystal plate, it is located at the color backlights bottom described black-and-white crystal plate and drives described black-and-white crystal plate and the control unit of color backlights, described colour is at least included the colored electric lamp bulb of a kind of color by light source, the colored electric lamp bulb of described each color is respectively connected with synchronization change-over circuit, the input of described synchronization change-over circuit is connected to the color control output end of described control unit, the public output of the described control unit common port that be connected to described black-and-white crystal plate corresponding with segment encode control output end and segment encode control end, the public output poll switching output of described control unit, while switching output, the simultaneously refreshed output in segment encode control output end and color control output end of control unit.
Present invention also offers a kind of air-conditioner including above-mentioned color liquid crystal display control circuit.
The invention has the beneficial effects as follows: technical solution of the present invention eliminates relatively costly special color liquid crystal managing chip, low-cost control unit is used to realize driving color liquid crystal to show, the public output of control unit, segment encode control output end and color control output end synchronism output, each segment encode poll colour shows, owing to segment encode poll switches quickly, user seems that each segment encode continuously displays, when implementing, described control unit can be the general MCU being built-in with liquid crystal driving module, can also be for common black-and-white crystal control chip and the MCU controlling described chip, no matter use which kind of mode, described black-and-white crystal control chip and MCU are matured products, price is relatively low.
Accompanying drawing explanation
Fig. 1 is existing color LCD module control circuit figure；
Fig. 2 is the circuit structure diagram of the color liquid crystal display control circuit that the embodiment of the present invention provides；
Fig. 3 is color liquid crystal displaying principle schematic diagram；
Fig. 4 is the field schematic diagram of each segment encode on black-and-white crystal plate；
Fig. 5 is the another kind of circuit structure diagram of the color liquid crystal display control circuit that the embodiment of the present invention provides；
Fig. 6 is a kind of circuit structure diagram synchronizing change-over circuit；
Fig. 7 is a kind of sequential chart of color control output end output voltage and colored electric lamp bulb duty；
Fig. 8 is the another kind of circuit structure diagram synchronizing change-over circuit；
Fig. 9 is the another kind of sequential chart of color control output end output voltage and colored electric lamp bulb duty；
Figure 10 is the third circuit structure diagram synchronizing change-over circuit；
Figure 11 is the third sequential chart of color control output end output voltage and colored electric lamp bulb duty.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 2 shows that the color liquid crystal that the embodiment of the present invention provides shows the circuit structure of control circuit, illustrate only the part relevant to the embodiment of the present invention for convenience of description.
The color liquid crystal display control circuit that the present embodiment provides includes black-and-white crystal plate 1, it is located at the color backlights 2 bottom described black-and-white crystal plate 1 and drives the control unit 3 of described black-and-white crystal plate 1 and color backlights 2, described colour is at least included the colored electric lamp bulb 21 of a kind of color by light source 2, the colored electric lamp bulb of described each color is respectively connected with synchronization change-over circuit 22, the input of described synchronization change-over circuit 22 is connected to the color control output end of described control unit 3, the public output of described control unit 3 common port that be connected to described black-and-white crystal plate 1 corresponding with segment encode control output end and segment encode control end, the public output poll switching output of described control unit 3, while switching output, the simultaneously refreshed output in segment encode control output end and color control output end of control unit 3.
So that segment encode color shows uniformly, with reference to Fig. 3, described color backlights 2 also includes light guide plate 23, the bottom of described light guide plate 23 is provided with diffuse-reflectance layer 24, and described colored electric lamp bulb 21 is positioned at described light guide plate side, and the optical fiber that colored electric lamp bulb 21 sends reflects in light guide plate, after reflecting through diffuse-reflectance layer 24, the light of shades of colour is sufficiently mixed, is radiated at equably on black-and-white crystal screen, mixing light from effective field transmission, ultimately form user it can be seen that color content.
The black-and-white crystal plate 1 that the present embodiment provides includes common port and segment encode controls end, assume there is N number of common port, M segment encode controls end, here N, M are natural number, the quantity of described common port is identical with the segment encode figure place that black-and-white crystal plate can show, every next common port gating, M segment encode controls the current segment encode gated of end control and demonstrates concrete content, light is allowed to pass through when segment encode shows effective when, if now color backlights 2 sends colourama, then just can demonstrate the content of colour on black-and-white crystal plate 1.nullAs a example by Fig. 2，In diagram，Common port 8 in black-and-white crystal plate 1，It is respectively COM0 ~ COM7，It is 7 that segment encode controls end，It is respectively SEGA ~ SEGG，Therefore，Black-and-white crystal plate 1 can demonstrate 8 segment encodes，Each segment encode has 7 fields，As shown in Figure 4，Give the field schematic diagram of each segment encode on black-and-white crystal plate 1，Each segment encode is gated by common port COM0 ~ COM7 correspondence，7 fields of each segment encode are respectively A ~ F，When the segment encode control end SEGA ~ SEGG of connection corresponding with described field is loaded with active voltage，This field effectively shows，Now can pass through light，If now color backlights 2 is luminous，The most described field will reveal whether the color of correspondence，Different fields is demonstrated by control，I.e. can be shown that the colorful digital of correspondence，Certain described each segment encode can also have more or less of field，Such as can also increase the field representing arithmetic point，So can demonstrate the colorful digital of mixed decimal point，Obviously the number of the field that the protection domain of the embodiment of the present invention does not limit the number of segment encode and each segment encode is comprised.
In the present embodiment, described colour is at least included the colored electric lamp bulb 2 of a kind of color by light source 2, and this colored electric lamp bulb can make the LED of shades of colour, it is assumed that has the colored electric lamp bulb of X kind color, then the bright or extinguishing according to each colored electric lamp bulb of control, then have 2XPlanting color combination, the segment encode on black-and-white crystal plate just can have 2XPlant color display to select, in order to reduce cost, generally segment encode can show that 8 kinds of colors are enough, i.e. need the colored electric lamp bulb of three kinds of colors, assume respectively red light, green light and blue lamp, under conditions of the luminous intensity of the bulb of each color determines, 8 kinds of colors output combination of color backlights output also determines that, and such as can be respectively in vain, red, green, blue, Huang, pink, black, azure.
Can be seen that from foregoing description, described control unit 3 needs N+M+X to control pin, the MCU being built-in with liquid crystal driving module of low side has had these pins at present, if not having these pins or number of pin inadequate, can also be by external for a MCU black-and-white crystal control chip, as it is shown in figure 5, such as model is the control chip of HT1622, this chip price is cheap, far below special color liquid crystal managing chip.Owing to this N+M+X control pin is on same MCU or same black-and-white crystal control chip, therefore their refreshing output speed is identical certainly, therefore can accomplish all of control pin synchronism output.In the present embodiment, the effect synchronizing change-over circuit 22 is that the voltage that the color control output end according to control unit 3 exports drives each colored electric lamp bulb luminous or extinguishes, when exporting active voltage, the corresponding colored electric lamp bulb connected is luminous, SEGr/SEGg/SEGb pin as shown in Figure 2, when SEGr/SEGg/SEGb pin output active voltage, described red light/green light/indigo plant lamp correspondence is luminous.In the embodiment of the present invention, the public output (COM end as shown in Figure 2) of control unit 3, segment encode control output end (SEG end as shown in Figure 2) and color control output end (SEGr/SEGg/SEGb end as shown in Figure 2) are simultaneously refreshed, when the most described public output COM the most effectively gates switching, described segment encode control output end SEG and the simultaneously refreshed output of SEGr/SEGg/SEGb of color control output end so that the content of corresponding color can be revealed when segment encode is strobed.Generally the public output time-sharing polling output gating of control unit 3, due to output switching quickly, is to continuously display at each segment encode of user, thus can demonstrate continuous print color content.
In the present embodiment, each field of each segment encode has display and does not show both of which, and when segment encode control end (SEGA ~ SEGG as shown in Figure 2) being connected with this field is loaded with active voltage, this field shows, otherwise when the voltage loaded is dead voltage, this field does not shows.
When implementing, the type of drive of black-and-white crystal plate 1 has multiple, such as static drive, 1/2 bias driving, 1/3 bias driving, 1/4 bias driving etc., if selecting static bias voltage to drive, so segment encode control output end and color control output end of control unit 3 can export two kinds of voltages, being respectively Vcc, Vss, wherein Vcc is active voltage, and Vss is dead voltage；If selecting 1/2 bias to drive, then the segment encode control output end of control unit 3 and color control output end can export three kinds of voltages, respectively Vcc, 1/2Vcc, Vss.Wherein 1/2Vcc is dead voltage.Vcc and Vss is active voltage；If selecting 1/3 bias, so segment encode control output end and color control output end of control unit 3 can export four kinds of voltages, being respectively tetra-kinds of voltages of Vcc, 1/3Vcc, 2/3Vcc, Vss, wherein 1/3Vcc, 2/3Vcc are dead voltage, Vcc and Vss is active voltage；If selecting 1/4 bias, so segment encode control output end and color control output end of control unit 3 can export five kinds of voltages, it is respectively Vcc, Vss, 1/4Vcc, 1/2Vcc, 3/4Vcc, wherein 1/4Vcc, 1/2Vcc, 3/4Vcc is dead voltage, Vcc and Vss is active voltage, the present invention includes seeing the type of drive being not limited to above-mentioned several black-and-white crystal plate, as long as the voltage of the segment encode control output end of control unit 3 and the output of color control output end can export active voltage and dead voltage, make to drive black-and-white crystal plate 1 to can show that corresponding contents.
Describe for convenience, below to select 1/4 bias type of drive that technical scheme is described.The voltage swing of the segment encode control output end of control unit 3 described here and the output of color control output end has five kinds, it is the first voltage, the second voltage, tertiary voltage, the 4th voltage and the 5th voltage the most respectively, first voltage and the 5th voltage are active voltage, and the second voltage, tertiary voltage and the 4th voltage are dead voltage.The running voltage assuming circuit is Vcc, described first voltage, the second voltage, tertiary voltage, the 4th voltage and the 5th voltage choose Vcc, 0.75Vcc, 0.5Vcc, 0.25Vcc and Vss successively, when the voltage that segment encode controls to load on end is Vcc or Vss, the field of this correspondence shows, when the voltage that segment encode controls to load on end is 0.75Vcc or 0.5Vcc or 0.25Vcc, corresponding field does not shows.
nullHere，So that the color control output end of control unit 3 (SEGr/SEGg/SEGb as shown in Figure 2) is when exporting the first voltage or five voltage，The corresponding colored electric lamp bulb connected is luminous，When exporting the second voltage or tertiary voltage or four voltage，The corresponding colored electric lamp bulb connected extinguishes，Need exist for described synchronization change-over circuit 22 is carried out circuit design，The most as shown in Figure 6，Described synchronization change-over circuit includes two comparator A、B，The normal phase input end of described comparator A connects first and compares voltage，The inverting input of described comparator B connects has second to compare voltage，The inverting input of described comparator A and the normal phase input end of comparator B are connected to the color control output end of control unit 3，Said two comparator A、The outfan C of B is connected to running voltage by pull-up resistor Rx，The most described running voltage passes sequentially through divider resistance Ry、Colored electric lamp bulb 21、Audion T connects into ground，Said two comparator A、The outfan of B is connected to the base stage of described audion T，Described first compares voltage between the first voltage and the second voltage，Described second compares voltage between the 4th voltage and the 5th voltage，The size adjusting divider resistance Ry can adjust colour lamplight intensity，Here the divider resistance Ry resistance of each synchronization change-over circuit is identical，The luminous intensity making each colored electric lamp bulb is identical.
In the present embodiment, the first voltage to the 5th voltage is respectively Vcc, 0.75Vcc, 0.5Vcc, 0.25Vcc and Vss, and described first compares voltage and second compares voltage and be respectively 0.8Vcc and 0.2Vcc, the logical relation of this circuit such as following table:
Can be seen that from upper table, when color control output end (SEGr/SEGg/SEGb as shown in Figure 2) exports the first voltage (Vcc) or the 5th voltage (Vss), the corresponding colored electric lamp bulb connected is luminous, when exporting the second voltage (0.75Vcc) or tertiary voltage (0.5Vcc) or the 4th voltage (0.25Vcc), the corresponding colored electric lamp bulb connected extinguishes, and specifically can refer to a kind of sequential chart of the color control output end output voltage shown in Fig. 7 and colored electric lamp bulb duty.The color control output end so making control unit 3 is identical with the definition of the active voltage of segment encode control output end, when exploitation without considering that the active voltage of each output port defines difference, reduces development difficulty.
In above-described embodiment, it is all full display when the first voltage (Vcc) and the 5th voltage (Vss), if in order to pursue low cost, relatively low to effect requirements ratio, now can also only select the first voltage (Vcc) or the display of the 5th voltage (Vss).Concrete, when being active voltage when selecting the first voltage, with reference to Fig. 8, show the another kind of structure synchronizing change-over circuit 22, including comparator A, the normal phase input end of described comparator A connects first and compares voltage, inverting input is connected to the color control output end of control unit 3, outfan is connected to running voltage by pull-up resistor Rx, the most described running voltage passes sequentially through divider resistance Ry, colored electric lamp bulb 21, audion T connects into ground, the outfan of described comparator A is connected to the base stage of described audion T, described first compares voltage between the first voltage and the second voltage.The running voltage also assuming that circuit is Vcc, described first voltage chooses Vcc, 0.75Vcc, 0.5Vcc, 0.25Vcc and Vss successively to the 5th voltage, described first to compare voltage be 0.8Vcc, when color control output end output voltage is Vcc, the corresponding colored electric lamp bulb connected is luminous, under other voltages, colored electric lamp bulb extinguishes, specifically can be according to the color control output end output voltage shown in Fig. 9 and the another kind of sequential chart of colored electric lamp bulb duty；When being active voltage when selecting the 5th voltage, with reference to Figure 10, show the third structure synchronizing change-over circuit 22, including comparator A, the inverting input of described comparator A connects second and compares voltage, normal phase input end is connected to the color control output end of control unit 3, outfan is connected to running voltage by pull-up resistor Rx, the most described running voltage passes sequentially through divider resistance Ry, colored electric lamp bulb 21, audion T connects into ground, the outfan of described comparator A is connected to the base stage of described audion T, described second compares voltage between the 4th voltage and the 5th voltage.Described first voltage chooses Vcc, 0.75Vcc, 0.5Vcc, 0.25Vcc and Vss successively to the 5th voltage, described first to compare voltage be 0.2Vcc, when color control output end output voltage is Vss, the corresponding colored electric lamp bulb connected is luminous, under other voltages, colored electric lamp bulb extinguishes, specifically can be according to the color control output end output voltage shown in Figure 11 and the third sequential chart of colored electric lamp bulb duty.The first voltage described in the present embodiment is to the 5th voltage, and first compares voltage and second and compare a kind of example of value of voltage and enumerate, and includes but not limited to above-mentioned value.
Obviously, if black-and-white crystal plate selects 1/3 bias, so segment encode control output end and color control output end of control unit 3 can export four kinds of voltages, first voltage to the 4th voltage is respectively tetra-kinds of voltages of Vcc, 1/3Vcc, 2/3Vcc, Vss, wherein 1/3Vcc, 2/3Vcc are active voltage, Vcc and Vss is dead voltage, first compares voltage between Vcc and 2/3Vcc, second compares voltage between 1/3Vcc and Vss, concrete synchronize change-over circuit 22 and also can use the circuit structure shown in Fig. 6, Fig. 8 or Figure 10；In like manner can also use other dividing potential drop type of drive, repeat no more here.
The present invention is further illustrated below by a concrete display example.Assume to need to go out " 01234567 " in black-and-white crystal screen display, corresponding color is " white, red, green, blue, sky blue, pink, yellow and black ", in order to realize this example, choose and include that 8 common ports (COM0 ~ COM7) and 7 segment encodes control end (SEGA ~ SEGG) black-and-white crystal plate, red LED lamp, green LED lamp, blue led lamp, and one piece of MCU being built-in with liquid crystal driving module, this MCU at least includes 18 I/O ports, according to connecting circuit shown in Fig. 2, common port COM0 ~ COM7 poll switching, switching frequency has the clock of MCU to determine, with this clock for beat synchronism output active voltage, each segment encode poll is made to demonstrate the content " 01234567 " of colour.The output voltage of each control output end (including segment encode control output end SEGA ~ SEGG and color control output end SEGr/SEGg/SEGb) of MCU is as shown in the table, and wherein " 1 " represents output active voltage, " 0 " expression output dead voltage:
| SEG | SEGA | SEGB | SEGC | SEGD | SEGE | SEGF | SEGG | SEGr | SEGg | SEGb | Color |
| COM0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | White |
| COM1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | Red |
| COM2 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | Green |
| COM3 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | Blue |
| COM4 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | Azure |
| COM5 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | Pink |
| COM6 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | Yellow |
| COM7 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Black |
The common port output port of MCU is from the gating output of COM0 ~ COM7 poll, switching frequency is quickly, owing to the vision of eye stops effect, last it is seen that an image continuously displayed: 0(is white) 1(is red) 2(is green) 3(is blue) 4(is azure) 5(is purple) 6(is yellow) 7(is black) while show.
Additionally, as another kind of embodiment, present embodiments provide a kind of air-conditioner, this air-conditioner includes described color liquid crystal display control circuit, the display interface of air-conditioner can demonstrate the content of multiple color, compared with the air-conditioner of the color liquid crystal managing chip special with existing employing, reduce the production cost of air-conditioner.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, although the present invention having been carried out explanation in greater detail with reference to previous embodiment, for a person skilled in the art, the technical scheme described in foregoing embodiments still can be modified or wherein portion of techniques feature is carried out equivalent by it.All any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (8)
- null1. a color liquid crystal display control circuit，It is characterized in that，Described circuit includes black-and-white crystal plate (1)、It is located at the color backlights (2) of described black-and-white crystal plate (1) bottom and drives the control unit (3) of described black-and-white crystal plate (1) and color backlights (2)，Described color backlights (2) includes that the colored electric lamp bulb (21) of at least one color and bottom are provided with the light guide plate (23) of diffuse-reflectance layer (24)，The colored electric lamp bulb of described each color is respectively connected with synchronization change-over circuit (22)，The input of described synchronization change-over circuit (22) is connected to the color control output end of described control unit (3)，The public output of described control unit (3) common port that be connected to described black-and-white crystal plate (1) corresponding with segment encode control output end and segment encode control end，The public output poll switching output of described control unit (3)，While switching output，The simultaneously refreshed output in segment encode control output end and color control output end of control unit (3).
- 2. color liquid crystal shows control circuit as claimed in claim 1, it is characterized in that, the exportable active voltage in segment encode control output end and color control output end of described control unit (3) and dead voltage, when exporting active voltage, colored electric lamp bulb is luminous, and when exporting dead voltage, colored electric lamp bulb extinguishes.
- 3. color liquid crystal shows control circuit as claimed in claim 2, it is characterized in that, described synchronization change-over circuit (22) includes two comparator A, B, the normal phase input end of described comparator A connects first and compares voltage, the inverting input of described comparator B connects second and compares voltage, the inverting input of described comparator A and the normal phase input end of comparator B are connected to the color control output end of control unit (3), said two comparator A, the outfan of B is connected to running voltage by pull-up resistor Rx, the most described running voltage passes sequentially through divider resistance Ry, colored electric lamp bulb (21), audion T connects into ground, said two comparator A, the outfan of B is connected to the base stage of described audion T.
- 4. color liquid crystal shows control circuit as claimed in claim 2, it is characterized in that, described synchronization change-over circuit (22) includes comparator A, the normal phase input end of described comparator A connects first and compares voltage, inverting input is connected to the color control output end of control unit (3), outfan is connected to running voltage by pull-up resistor Rx, the most described running voltage passes sequentially through divider resistance Ry, colored electric lamp bulb (21), audion T with connecting into, and the outfan of described comparator A is connected to the base stage of described audion T.
- 5. color liquid crystal shows control circuit as claimed in claim 2, it is characterized in that, described synchronization change-over circuit (22) includes comparator A, the inverting input of described comparator A connects second and compares voltage, normal phase input end is connected to the color control output end of control unit (3), outfan is connected to running voltage by pull-up resistor Rx, the most described running voltage passes sequentially through divider resistance Ry, colored electric lamp bulb (21), audion T with connecting into, and the outfan of described comparator A is connected to the base stage of described audion T.
- 6. color liquid crystal shows control circuit as claimed in claim 1 or 2, it is characterised in that colored electric lamp bulb (21) includes red LED lamp, green LED lamp and blue led lamp.
- 7. color liquid crystal shows control circuit as claimed in claim 6, it is characterised in that control unit (3) is the microprocessor being built-in with liquid crystal driving module, or is independent LCD Controlling chip and microprocessor.
- 8. an air-conditioner, it is characterised in that described air-conditioner includes the color liquid crystal display control circuit as described in any one of claim 1-7.
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