CN1378194A - Driving circuit of liquid crystal display device and its image display method - Google Patents
Driving circuit of liquid crystal display device and its image display method Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title description 21
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- 230000003139 buffering effect Effects 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 5
- 229920000620 organic polymer Polymers 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
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Abstract
The present invention relates to LCD driving circuit and its image display method. By using analog memory array as the storing means for analog image information, analog image signals may be stored, and display buffer to buffer the information processing rate may be used in storing analog signals in image signal processing. In case of interrupting the input of analog image signals, the LCD can still display the image by means of the analog image information stored in the analog memory unit array. The display driving of LCD needs no D/A converter and this can reduce cost.
Description
The present invention relates to a kind of LCD (hereinafter to be referred as LCD) driving circuit, relate in particular to the directly former simulation signal of video signal of storage of a kind of use analog memory cell array, thus the liquid crystal display drive circuit and the image display method thereof that on LCD, carry out video picture.
LCD is as far back as just being applied on electronic watch and the tiny computer at the beginning of 1970, and subsequently, LCD also is used in automobile and other testing tools are used for display digit and figure.LCD has advantages such as thin thickness, in light weight and power consumption be low, in recent years because the development of LCD colorize, be applied to gradually on the display of small sized colour TV, notebook computer and projection color tv, the trend that replaces traditional camera tube (CRT) is gradually arranged, for being noted most one of photovoltaic assembly with expectation now.
At present most widely used LCD working method is for rotating to row (Twisted Nematic; Hereinafter to be referred as TN) mode, its principle of work be molecular group join with order along with temperature and the electric field that applied and change, just will be visual to the column jump phenomenon, if just but enclose the filter coating colorize.TN type liquid crystal display cells is to utilize two polaroids to be clipped on the liquid crystal layer with quadrature, light by the top Polarizer is because the optical anisotropy of liquid crystal molecule, can be along liquid crystal molecule distortion, then by the polaroid of below, last what see is bright state.When applying electric field on liquid crystal layer, the distortion orientation meeting of liquid crystal molecule is disengaged, and makes incident light be subjected to covering of bottom polaroid and becomes dark state.
For example, when voltage was 0, all liquid crystal molecules almost all lay low and are reversed 90 °, and this moment, light passed through event transmitance maximum fully, and expression is bright picture.And when applying voltage and strengthen gradually, liquid crystal molecule is also stood up gradually along direction of an electric field, and therefore the light that sees through is blocked by Polarizer gradually, transmitance descends gradually, and becoming complete black picture at last, this section voltage makes display frame gradually by bright deepening, that is so-called GTG.Because the existence of remarkable gray scale voltage is arranged, twisted-nematic formula LCD just can form different shading values.If on a base material, add color filter film, just can be made into colored LCD device.One of characteristic of twisted-nematic formula LCD (TN-LCD) and the existence of GTG can be said so.
Because LCD itself is made of a LCD panel, each point is distinguished R (red), G (green), three kinds of colors of B (indigo plant) on the corresponding color filter film on the LCD panel, and forms the various arrangements of red, green, blue pixel, and the every bit on the LCD panel then constitutes a pixel.When last certain point of LCD is desired video picture, then the R on the LCD panel, G, B corresponding pixel points are applied an analog information, and the various video picture information of synthetic described point, such as color, brightness or the like.Therefore, LCD itself is by R, G, three kinds of dot matrix type displays that pixel constituted of B from the above.And the videograph process of general LCD and composition structure thereof are with as described below.
With reference to figure 1, it shows the schematic block diagram of traditional a kind of liquid crystal display drive circuit.
When the input signal of video signal was the analog image signal, in simple terms, this analog image signal just can come out on LCD 12 after handling through the adjustment of buffering driver 10 in video picture.
With reference to figure 2, it shows the schematic block diagram of traditional another kind of liquid crystal display drive circuit.
When the input signal of video signal was digital image signal, this digital image signal must convert the analog image signal to through digital analog converter (DAC) 20 earlier, and then handled through the adjustment of buffering driver 22, just can video picture on LCD 24.
For two kinds of above-mentioned classic methods, as shown in Figure 1, when the input signal of video signal is the analog image signal,, when stopping to import this analog image signal, will make LCD can't continue video picture though can directly on LCD, carry out video picture.
On the other hand, as shown in Figure 2, when the input signal of video signal was digital image signal, prior art was that this digital image signal is stored in the general memory cell array in two-symbol mode, carries out image display by digital analog converter then.Yet, use digital analog converter, its cost cost height, deficiency in economic performance.
The objective of the invention is to solve above-mentioned the problems of the prior art, propose a kind of liquid crystal display drive circuit,, can directly store former simulation signal of video signal by using the analog memory cell array as analog image information stores instrument, form display buffer, the buffer information processing speed.Even thereby interrupt the input of external analog signal of video signal, LCD still can show image by being stored in the analog image information of analog memory cell array inside.And on the display driver of LCD, needn't relend and help digital analog converter, thereby escapable cost.
To achieve these goals, according to liquid crystal display drive circuit of the present invention, it comprise analog memory cell array, simulation row read/write circuit, row write and select circuit, row to read to select circuit, buffering driver and LCD.The analog memory cell array is in order to storage analog image signal, and wherein this analog image signal comprises capable image information and row image information.Simulation row reads/and write circuit is stored in the capable image information in the analog memory cell array and the image information of will going is written in the analog memory cell array in order to read.Row write selects circuit in order to the row image information is written in the analog memory cell array.Row are read and are selected circuit in order to read the row image information that is stored in the analog memory cell array.Buffering driver is in order to receive the capable image information that the analog memory cell array transmits.LCD is in order to reception row image information and row image information, thereby video picture goes out to simulate signal of video signal.
According to a further aspect in the invention, described circuit of display driving also comprises one scan line latch unit, in order to receiving and to pin described analog image signal, and described analog image signal delivered to described simulation row read/write circuit in.
Simultaneously, in the present invention, described display can comprise membrane transistor LCD, twisted-nematic formula LCD, electric slurry formula display, organic polymer formula display and an emissive display.
In addition, the present invention also proposes a kind of method of image display, and comprising at first provides an analog image signal, and this analog image signal comprises capable image information and row image information.Then, capable image information and the row image information with the analog image signal is stored in the analog memory cell array.At last, receive the capable image information and the row image information that are stored in the analog memory cell array, so that video picture goes out to simulate signal of video signal.
In sum, the present invention has following advantage:
(1) can directly store, and form display buffer former simulation signal of video signal.
(2) on the display driver of LCD, can be again by a plurality of digital analog converters, thus escapable cost.
(3) owing to the existence of above-mentioned display buffer is arranged, so can the buffer information processing speed.
(4) display buffer can be used to do the analog form storage of different images signal Processing information.
(5) though the input of break simulation signal of video signal, LCD still can demonstrate image by being stored in the analog image information of analog memory cell array inside.
By below in conjunction with the specific descriptions of respective drawings to most preferred embodiment of the present invention, can make that above-mentioned purpose, feature and advantage with other of the present invention are more cheer and bright, wherein:
Fig. 1 illustrates a kind of schematic block diagram of traditional liquid crystal display drive circuit;
Fig. 2 illustrates the schematic block diagram of the traditional liquid crystal display drive circuit of another kind; And
Fig. 3 illustrates the schematic block diagram according to a kind of liquid crystal display drive circuit of a preferred embodiment of the present invention.
In the prior art, directly use the memory cell array stores analog information, hereinafter referred to as the analog memory cell array, yet usually only with this kind analog memory cell arrayed applications in the storage of sound, it directly is not applied in the storage of analog image signal, and the present invention promptly is to use this kind analog memory cell array, and it is applied in the LCD driving circuit.
With reference to figure 3, it illustrates the schematic block diagram according to a kind of liquid crystal display drive circuit of a preferred embodiment of the present invention.
Liquid crystal display drive circuit of the present invention comprises one scan line latch unit 30, one simulation row is read/write circuit 32, one analog memory cell array 34, one row write selects circuit 36, one row are read and are selected circuit 38, one sequential generator 39, one buffering driver 40 and a LCD 42, wherein LCD 42 for example is membrane transistor LCD (TFT-LCD), twisted-nematic formula LCD (TN-LCD), electricity slurry formula display, an organic polymer formula display and an emissive display etc., and input signal of video signal used in the present invention is the analog image signal.Sweep trace latch unit 30 is to be made up of a plurality of sampling/holding circuits, in order to reception and pinning analog image signal, and this analog image signal is delivered to the simulation row read/write circuit 32.Simulation row reads/and write circuit 32 writes in the analog memory cell array 34 in order to the capable image information of reading the analog image signal that is stored in the analog memory cell array 34 or with the capable image information of this analog image signal.Row write selects circuit 36 to be written in the analog memory cell array 34 in order to the row image information of selecting with the analog image signal.Row are read and are selected the row image information of reading the analog image signal that be stored in analog memory cell array 34 of circuit 38 in order to select, and this analog image signal is sent in the LCD 42.Buffering driver 40 is in order to receiving the capable image information that analog memory cell array 34 transmits, and this journey image information is delivered in the LCD 42.39 of clock generators are used to produce each circuit sequence, and it comprises the positive and negative phase control timing that LCD drives.
Principle of work according to liquid crystal display drive circuit of the present invention is as follows, when sweep trace latch unit 30 receives and pin the analog image signal, the simulation row reads/and write circuit 32 writes with row and selects circuit 36 the capable image information and the row image information of described analog image signal can be written in the analog memory cell array 34 respectively.Read the row image information of selecting circuit 38 to read the analog image signal that is stored in the analog memory cell array 34 by row then, and this analog image signal is delivered in the LCD 42.Simultaneously, when buffering driver 40 was delivered to LCD 42 with the capable image information of the analog image signal in the analog memory cell array 34, in conjunction with the row image information of before having sent here, LCD 42 just can be carried out video picture.In addition, for LCD 42, its line output can be made signal via amplifier and promote to amplify and just anti-phase change, for example can be added on the source electrode of panel membrane transistor in membrane transistor LCD (TFT-LCD), then can be in twisted-nematic formula LCD (TN-LCD) with the positive inversion signal of output, being shifted via voltage level is added on pixel electrode.
Because the present invention is for directly to store the analog image signal of former input, so needn't be through the conversion work of conventional digital analog converter, directly video picture on LCD 42.And, application simulation memory cell array 34 is directly done storage to the analog image signal, it is as being same as display buffer, the available buffer information processing rate, even the input of break simulation signal of video signal, LCD 42 still can demonstrate image by being stored in the analog image information of analog memory cell array 34 inside.
Certainly, row write selects circuit 36 when writing the work of a row image information, row are read the work of selecting circuit 38 can read another row image information simultaneously, i.e. the work that writes of the row image information in the analog memory cell array 34 can continue to carry out with the work of reading and uninterrupted.In addition, the memory capacity of analog memory cell array 34 used in the present invention is changeable, and for example capacity can be accomplished such as more than the 1M.
Though invention has been described in conjunction with most preferred embodiment; yet it is not to be limitation of the invention; for those of skill in the art; without departing from the spirit and scope of the present invention; can do various changes and modification, but these variations and modification are all within the protection domain of appended claim of the present invention.
Claims (8)
1. circuit of display driving is characterized in that comprising:
One analog memory cell array, in order to store an analog image signal, described analog image signal comprises a delegation's image information and a row image information;
One simulation row is read/write circuit, couples with described analog memory cell array, in order to read the described capable image information that is stored in the described analog memory cell array and described capable image information is written in the described analog memory cell array;
One row write the selection circuit, couple with described analog memory cell array, in order to described row image information is write in the described analog memory cell array;
One row are read the selection circuit, couple with described analog memory cell array, in order to read the described row image information that is stored in the described analog memory cell array;
One buffering driver couples with described analog memory cell array, in order to receive the described capable image information that described analog memory cell array transmits; And
One display is read with described row and to be selected circuit and described buffering driver to couple, and in order to receiving described row image information and described capable image information, thereby video picture goes out described analog image signal.
2. circuit of display driving according to claim 1, it is characterized in that described circuit of display driving also comprises one scan line latch unit, in order to receiving and to pin described analog image signal, and described analog image signal delivered to described simulation row read/write circuit in.
3. circuit of display driving according to claim 1 is characterized in that described display comprises the membrane transistor LCD.
4. circuit of display driving according to claim 1 is characterized in that described display comprises twisted-nematic formula LCD.
5. circuit of display driving according to claim 1 is characterized in that described display comprises electric slurry formula display.
6. circuit of display driving according to claim 1 is characterized in that described display includes organic polymer formula display.
7. circuit of display driving according to claim 1 is characterized in that described display comprises an emissive display.
8. an image display method is characterized in that comprising the following steps:
One analog image signal is provided, and described analog image signal comprises a delegation's image information and a row image information;
The described capable image information and the described row image information of described analog image signal are stored in the analog memory cell array; And
Reception is stored in described capable image information and the described row image information in the described analog memory cell array, so that video picture goes out described analog image signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01110234 CN1378194A (en) | 2001-04-03 | 2001-04-03 | Driving circuit of liquid crystal display device and its image display method |
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| CN 01110234 CN1378194A (en) | 2001-04-03 | 2001-04-03 | Driving circuit of liquid crystal display device and its image display method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306467C (en) * | 2003-02-27 | 2007-03-21 | 奇景光电股份有限公司 | Data drive used on liquid crystal display panel |
| CN101165759B (en) * | 2001-08-29 | 2012-07-04 | 日本电气株式会社 | Semiconductor device for driving current load device and current load device equipped with the same |
-
2001
- 2001-04-03 CN CN 01110234 patent/CN1378194A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165759B (en) * | 2001-08-29 | 2012-07-04 | 日本电气株式会社 | Semiconductor device for driving current load device and current load device equipped with the same |
| CN1306467C (en) * | 2003-02-27 | 2007-03-21 | 奇景光电股份有限公司 | Data drive used on liquid crystal display panel |
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