CN103000150A - Liquid crystal display module and transmission method of display data - Google Patents

Abstract

The invention discloses a liquid crystal display module and a transmission method of display data. The liquid crystal display module comprises a thin film transistor (TFT) module, a field programmable gate array (FPGA) circuit and a static random access memory (SRAM) module. The input end of the FPGA circuit can be connected with a super twisted nematic (STN) control chip to receive STN driving signals. The FPGA circuit converts the STN driving signals into TFT driving signals, the output end of the FPGA circuit is connected with the TFT module and sends the TFT driving signals to the TFT module, and the SRAM module is connected with the FPGA circuit to conduct transmission switch of the STN data and the TFT data. Compared with the prior art, the STN control chip does not need any adjustment in hardware or software and still outputs the STN driving signals, and therefore the liquid crystal display module does not require adjustment on a single-chip microcomputer and is low in upgrading cost.

Description

A kind of LCD MODULE and demonstration data transfer method

Technical field

The present invention relates to the liquid crystal technology field, relate in particular a kind of LCD MODULE, it can under the situation that does not change Single Chip Microcomputer (SCM) system, be realized upgrading to the TFT liquid crystal module by the stn liquid crystal module, and obtain high-contrast, wide visual angle and good low temperature performance.

Background technology

The STN module is the highest can the realization from static drive to the 1/240DUTY turntable driving generally, increase along with the scanning way, the contrast of STN module also can progressively descend, response speed also can descend simultaneously, high low temperature shows also progressively variation, the extremely slow and contrast extreme difference of low temperature response speed, appearance shows the phenomenon of variable color during high temperature.This problem is subject to traditional STN technique, has had no idea further to improve to improve, and simultaneously along with the increase of scanning way, produces yield and can progressively reduce, and price also can progressively improve.

The TFT module is compared with the STN module, because each phase vegetarian refreshments controlled separately by thin film transistor (TFT), its display effect can therefore variation progressively replacing the STN module in some field TFT modules along with the increase of scanning way.

But, at present when using the TFT module, except replacing the STN module, also need simultaneously Single Chip Microcomputer (SCM) system (comprising hardware and software) to be upgraded replacement, so can allow TFT show is achieved, like this so that whole upgrade cost improves greatly, be not easy to applying of new product.

Summary of the invention

Fundamental purpose of the present invention is to provide a kind of LCD MODULE, it need not the software and hardware of Single Chip Microcomputer (SCM) system is carried out any change, can realize showing that by STN upgrade to TFT shows, thereby solve higher and the problem that impact is extensively promoted of prior art cost when realizing upgrading.

In order to reach above-mentioned purpose, solution of the present invention is:

A kind of LCD MODULE, wherein, comprise TFT module, FPGA circuit and SRAM module, the input end of this FPGA circuit can receive STN and drive signal for linking to each other with the STN control chip, this FPGA circuit drives signal with this STN and is converted to TFT driving signal, the output terminal of this FPGA circuit links to each other with the TFT module and TFT is driven signal is sent to the TFT module, and this SRAM module links to each other to carry out STN data and TFT data transfer and switches with the FPGA circuit.

Described SRAM module has a SRAM and the 2nd SRAM, a SRAM all link to each other with the FPGA circuit with the 2nd SRAM and intersect carry out translation data and output data.

Described LCD MODULE also comprises backlight drive circuit, and this backlight drive circuit is arranged between TFT module and the FPGA circuit.

Described LCD MODULE also comprises display mode selection circuit, and this display mode selects circuit to link to each other with the FPGA circuit.

Another object of the present invention is to provide a kind of demonstration data transfer method, wherein, comprise the steps:

1. drive signal and show data from STN control chip crawl STN by the FPGA circuit;

2. this FPGA circuit is laterally vertically respectively expanded 2 times and deposit among the SRAM to form the first frame TFT data with the STN data of the first frame;

3. the STN data of the second frame are laterally vertically respectively expanded 2 times and deposit among the 2nd SRAM to form the second frame TFT data, this FPGA circuit also produces TFT and drives signal simultaneously, transfers the first frame TFT data and be sent to the TFT module from a SRAM;

4. the STN data of the 3rd frame are laterally vertically respectively expanded 2 times and deposit among the SRAM to form the 3rd frame TFT data, this FPGA circuit also produces TFT and drives signal simultaneously, transfers the second frame TFT data and be sent to the TFT module from the 2nd SRAM;

5. with the mode repeating step of analogizing 3. and 4., to finish the transmission of all frame data.

After adopting said structure, a kind of LCD MODULE that the present invention relates to and demonstration data transfer method, it can directly allow the FPGA circuit link to each other with existing STN control chip, then utilize the FPGA circuit as a function served as bridge, be about to STN driving signal and be converted to TFT driving signal, so that the TFT module can be worked.

So, compared with prior art, the present invention is for this STN control chip, and it all need not to carry out any adjustment on hardware or on the software, and the STN that remains of its output drives signal; So the present invention need not Single Chip Microcomputer (SCM) system is adjusted, thereby has the low effect of upgrade cost.

Description of drawings

Fig. 1 is the structured flowchart that the present invention relates to a kind of LCD MODULE preferred embodiment.

Among the figure:

LCD MODULE-100; TFT module-1; FPGA circuit-2;

SRAM module-3; The one SRAM-31; The 2nd SRAM-32;

Backlight drive circuit-4; Display mode is selected circuit-5; STN control chip-200.

Embodiment

In order further to explain technical scheme of the present invention, the present invention will be described in detail below by specific embodiment.

As shown in Figure 1, a kind of LCD MODULE 100 that the present invention relates to, comprise TFT module 1, FPGA circuit 2 and SRAM module 3, the input end of this FPGA circuit 2 can receive STN and drive signal for linking to each other with STN control chip 200, this FPGA circuit 2 drives signal with this STN and is converted to TFT driving signal, the output terminal of this FPGA circuit 2 links to each other with TFT module 1 and TFT is driven signal is sent to TFT module 1, and this SRAM module 3 links to each other to carry out STN data and TFT data transfer and switches with FPGA circuit 2.Particularly, STN control chip 200 can be RA6963.

In the present embodiment, this SRAM module 3 has a SRAM31 and the 2nd SRAM32, a SRAM31 all link to each other with FPGA circuit 2 with the 2nd SRAM32 and intersect carry out translation data and output data, its specific works process is as follows:

This FPGA circuit 2 drives signal and shows data from STN control chip 200 crawl STN, then by this FPGA circuit 2 the first frame STN data are laterally vertically respectively expanded 2 times and deposit among the SRAM31 to form the first frame TFT data, namely become the resolution of the 480*256 of TFT data by the 240*128 resolution extension of original STN data; Finish the first frame STN data are stored into a SRAM31 after, next the data of the second frame are stored in the same way as among the 2nd SRAM32 to form the second frame TFT data, in storage the second frame data, this FPGA circuit 2 also produces TFT and drives signal, be sent to TFT module 1 and from a SRAM31, transfer the first frame TFT data, then the 3rd frame STN data are stored among the SRAM31 to form the 3rd frame TFT data again, when these the 3rd frame data of storage, this FPGA circuit 2 also produces TFT and drives signal and transfer the second frame TFT data be sent to the TFT module from the 2nd SRAM32, so repeatedly carry out, thereby utilize a SRAM31 and two storeies of the 2nd SRAM32 to carry out respectively translation data and output data, realized data transfer.

In addition, described LCD MODULE 100 also comprises backlight drive circuit 4, and this backlight drive circuit 4 is arranged between TFT module 1 and the FPGA circuit 2, so can utilize 2 pairs of switches that carry out backlight of FPGA circuit to control.In order to allow people can realize rapidly the adjustment of display mode, the LCD MODULE 100 that the present invention relates to also comprises display mode selection circuit 5, and this display mode selects circuit 5 to link to each other with FPGA circuit 2.So, need not to change LCD and backlight, just can automatically change display mode, thereby satisfy different clients to the demand of display mode.

Like this, a kind of LCD MODULE 100 that the present invention relates to, when it uses in reality, can directly allow FPGA circuit 2 link to each other with existing STN control chip 200, namely allow this FPGA circuit 2 as a bridge and STN is driven signal be converted to TFT and drive signal, so that TFT module 1 can be worked.For this STN control chip 200, it all need not to carry out any adjustment on hardware or on the software, and the STN that remains of its output drives signal.

In sum, characteristics of the present invention are: the client can directly upgrade to TFT with STN not changing any hardware and software system and not increasing under the prerequisite of cost, and acquisition high-contrast, wide visual angle, good high low temperature show, and upgrade cost is low.

Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present invention to its suitable variation or modification of doing.

Claims (5)

1. LCD MODULE, it is characterized in that, comprise TFT module, FPGA circuit and SRAM module, the input end of this FPGA circuit can receive STN and drive signal for linking to each other with the STN control chip, this FPGA circuit drives signal with this STN and is converted to TFT driving signal, the output terminal of this FPGA circuit links to each other with the TFT module and TFT is driven signal is sent to the TFT module, and this SRAM module links to each other to carry out STN data and TFT data transfer and switches with the FPGA circuit.

2. a kind of LCD MODULE as claimed in claim 1 is characterized in that, described SRAM module has a SRAM and the 2nd SRAM, a SRAM all link to each other with the FPGA circuit with the 2nd SRAM and intersect carry out translation data and output data.

3. a kind of LCD MODULE as claimed in claim 1 is characterized in that, described LCD MODULE also comprises backlight drive circuit, and this backlight drive circuit is arranged between TFT module and the FPGA circuit.

4. a kind of LCD MODULE as claimed in claim 1 is characterized in that, described LCD MODULE also comprises display mode selection circuit, and this display mode selects circuit to link to each other with the FPGA circuit.

5. show the data transfer method in a utilization such as each described LCD MODULE of claim 1 to 4, wherein, comprise the steps:

1. drive signal and show data from STN control chip crawl STN by the FPGA circuit;

2. this FPGA circuit is laterally vertically respectively expanded 2 times and deposit among the SRAM to form the first frame TFT data with the STN data of the first frame;

3. the STN data of the second frame are laterally vertically respectively expanded 2 times and deposit among the 2nd SRAM to form the second frame TFT data, this FPGA circuit also produces TFT and drives signal simultaneously, transfers the first frame TFT data and be sent to the TFT module from a SRAM;

4. the STN data of the 3rd frame are laterally vertically respectively expanded 2 times and deposit among the SRAM to form the 3rd frame TFT data, this FPGA circuit also produces TFT and drives signal simultaneously, transfers the second frame TFT data and be sent to the TFT module from the 2nd SRAM;

5. with the mode repeating step of analogizing 3. and 4., to finish the transmission of all frame data.

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