CN101329849B

CN101329849B - Data interface circuit for LCD screen

Info

Publication number: CN101329849B
Application number: CN2008101157813A
Authority: CN
Inventors: 周志涛
Original assignee: Vimicro Corp
Current assignee: Wuxi Vimicro Corp
Priority date: 2008-06-27
Filing date: 2008-06-27
Publication date: 2010-09-29
Anticipated expiration: 2028-06-27
Also published as: CN101329849A

Abstract

The invention discloses an LCD screen data interface circuit and a method thereof. The circuit is characterized by comprising a mode register and a head data register; the mode register is applied to determining a format conversion type which the LCD screen belongs to and according to the format conversion type, the head data register regroups different pixels by bit so as to send the pixels to the LCD screen. The LCD screen data interface circuit and the method of the invention provide a set of relatively simple and universal interface fulfillment model, support all format conversion throughchanging a group of registers and need not to worry about incompatibility for being capable of supporting all novel LCD screens.

Description

A kind of LCD screen data interface circuit

Technical field

The present invention relates to the LCD screen, relate in particular to LCD screen data interface circuit.

Background technology

Lcd screen is various in style on the market, and is also different to data interface and data layout demand.Traditional interface circuit implementation employing is enumerated way and is covered form as much as possible, for each different-format LCD screen, all must make circuit kit support to measure for it.Because market screen updates speed is very fast, traditional circuit structure is not supported a lot of new screens, needs patch installing again, revises the hardware circuit design.

Classic method is at the requirement of certain a special screen to the input pixel format, and the corresponding circuit of design one cover is supported, adopts the mode of enumerating to design format conversion circuit as much as possible.At present main implementation can be understood by following four sections of LCD screen form.

Fig. 1 is 16 bit interface to 16 R: G: B=5: the synoptic diagram that 6: 5 pixels read.Its implementation procedure comprises: read a pixel, send number according to write operation of branch shown in Figure 1, a write cycle time is finished a secondary data and is transmitted.

Fig. 2 is 8 bit interface to 16 pixel R: G: B=4: the synoptic diagram that reads at 4: 4.Its implementation procedure comprises: read a pixel, write operation send number at twice, and for the first time write operation send the R[7:4 of pixel] and G[7:4], write operation send the B[7:4 of pixel for the second time] and the R[7:4 that repeats], such twice write operation finished once and circulated.

Fig. 3 is 8 bit interface to 24 pixel R: G: B=8: the synoptic diagram that reads at 8: 8.Its implementation procedure comprises: read a pixel, divide three write operations to send number, write operation send the R of pixel for the first time, and write operation send the B of pixel for the second time, and write operation send pixel B for the third time, and such three write operations are finished once circulation.

Fig. 4 is 16 bit interface to 24 pixel R: G: B=8: the synoptic diagram that reads at 8: 8.Its implementation procedure comprises: read two pixels, divide three write operations to send number, write operation gives the RG of first pixel for the first time, and write operation gives the B of first pixel and the R of second pixel for the second time, write operation send the GB of second pixel for the third time, finishes once circulation like this.

For top four examples, traditional implementation is taked the mode enumerated, must prepare the quadruplet hardware circuit implementation at least and support.

The hardware interface circuit that adopts traditional mode of enumerating to realize not in the circuit scope of enumerating, is promptly enumerated situation about not covering in case find new screen form, can only add new hardware interface circuit and support new demand by patch installing.So compatible performance is bad, and the patch installing meeting prolongs the design cycle repeatedly, is unfavorable for the succession of code.

Summary of the invention

The objective of the invention is to As soon as possible Promising Policy the demand of LCD screen might appear, by analyzing the characteristics of the plain interface conversion of the LCD screen image form that institute might occur, design the general Data Format Transform interface circuit of a cover, can satisfy all lcd screen pixel data format conversion substantially.

For this reason, the present invention provides a kind of LCD screen data interface circuit in first aspect, and this circuit is characterised in that and comprises a mode register and a data register; Described mode register is used for determining that LCD shields needed Format Type, and according to described Format Type, described data register recombinated the step-by-step of different pixels part, so that send to the LCD screen.

The present invention provides a kind of LCD screen data interface method in second aspect.The method is characterized in that and comprise that definite LCD shields needed Format Type; According to described Format Type, the step-by-step of different pixels part is recombinated, so that send to the LCD screen.

The invention provides fairly simple, the general interface implementation pattern of a cover, support all format conversion, all support, do not need to worry for incompatible problem in the face of the LCD screen that emerges in an endless stream by one group of register of software change.

Description of drawings

Below with reference to accompanying drawings specific embodiments of the present invention is described in detail, in the accompanying drawing:

Fig. 1 is the synoptic diagram that 16 bit interface read 16 R:G:B=5:6:5 pixels

Fig. 2 is the synoptic diagram that 8 bit interface read 16 pixel R:G:B=4:4:4;

Fig. 3 is the synoptic diagram that 8 bit interface read 24 pixel R:G:B=8:8:8;

Fig. 4 is the synoptic diagram that 16 bit interface read 24 pixel R:G:B=8:8:8;

Fig. 5 is an interface data flow graph of the present invention; And

Fig. 6 is Data Format Transform scheme realization figure of the present invention.

Embodiment

Comprehensive LCD screen image prime number can be summed up as lcd screen four big classes according to the characteristics of format transformation:

1) read pixel source data, one time write operation sends;

2) read pixel source data, write operation sends at twice;

3) read pixel source data, divide three write operations to see off;

4) read two pixel source data, divide three write operations to see off.

Fig. 5 is an interface data flow graph of the present invention.In a cycle period, may read one or two pixel.Then,, divide several times write operation in some way data to be seen off, finish a cycling according to the form of the needs of lcd screen.

Each write operation may be the data of any position section among pixel one or pixel two RGB.

For write operation each time, need to determine:

1. judge that the LCD screen belongs to any Format Type (being example with pixel R hereinafter);

2. for write operation each time, a register need be set determine that the pixel that is about to write is first pixel 1_R or second pixel 2_R;

3. for a write operation, an enable register need be set, determine whether this write operation needs to write pixel R;

4. write pixel R if desired, need determine to write which position of pixel R and these are write which position of corresponding output data.

In an example, two registers are set.The highest significant position and the position in corresponding output data thereof of a register-stored pixel R part to be written, its least significant bit (LSB) of another register-stored and the position in corresponding output data thereof.

In another example,, provide a kind of circuit that simplifies in order to reduce the hardware costs of judgement.For R, suppose and all send 8 bit data at every turn, utilize a register that most significant digit data bit R[7 is set then] the address get final product.And in fact, may not need to send 8 bit data, needed actual number of bits gets final product for LCD shields can to utilize another register that this pixel is set again.

Fig. 6 is Data Format Transform scheme realization figure of the present invention.As shown in Figure 6, at first, carry out Format Type and judge.If type 00 means that the LCD screen adopts for example data-interface of Fig. 1, then exports needed R, G, B data according to Fig. 1 format configuration.If Class1 0 means that the LCD screen adopts for example data-interface of Fig. 4, then exports needed R, G, B data according to Fig. 4 format configuration.Similarly,

type

01 and 11 means that respectively the LCD screen adopts the data-interface of Fig. 2 and 3, then according to corresponding format configuration output needed R, G, B data.

Next, be example with the data-interface of Fig. 1, the Data Format Transform scheme of Fig. 6 is elaborated.

1) analyzes the type that LCD shields, belong to and read a pixel, divide a write operation to send.

2) each operation all needs to dispose the RGB that writes pixel, and then the RGB enable register all needs to open.

3) because a pixel is read in each operation, all are first pixels so action need writes, i.e. 1_R, 1_G, 1_B.

4), need be with 1_R[7:3 according to Fig. 1] put into data line data[15:11] on.(1_R only is described here)

A), at first confirm most significant digit 1_R[7 for R] corresponding data[15], can place 1_R[7:0 like this] to data[15:8] on.(each unified 8 bit data that all dispose, unwanted bit data can be invalid in the c operation)

B) disposing 1_R significance bit register then is 1111_1000_0000_0000.

C) do and logic according to 1_R significance bit register information, just can draw 1_R[7:3] correspond to data[15:11] gone up.

5) in like manner can finish 1_G, 1_B, 2_R, 2_G, the configuration of 2_B.

Secondly, be example with the data-interface of Fig. 4, the Data Format Transform scheme of Fig. 6 is elaborated.

1) analyzes the type that LCD shields, belong to and read two pixels, divide three write operations to send.

2) each operation needs to dispose among the RGB that writes pixel two respectively, then needs corresponding RGB enable register to open.

3) because two pixels are read in each operation, divide three times write operation.So that each write operation need write is respectively 1_R and 1_G; 1_B and 2_R; 2_G and 2_B.

4), need be with 1_R[7:0 according to Fig. 4] put into data line data[15:8] on.

5) in like manner can finish 1_G, 1_B, 2_R, 2_G, the configuration of 2_B.

It may be noted that to the invention is not restricted to previously described four kinds of Format Types, and every type also is not limited to the read-write mode shown in Fig. 1-4.Such as, in Class1 0, after reading two pixel source data, can be with R1 and B1, G1 and R2, B2 and G2 divide three write operations to send out, rather than R1 shown in Figure 4 and G1, B1 and R2, G2 and B2.The present invention goes for various other Format Type and read-write modes.

The present invention program has following advantage:

(1) common-mode, universality is strong.

A kind of universal pattern is provided, by software preparation register, can produces and be applicable to the on the market format conversion of the demand of various LCD screens, do not need to be the new incompatible patch that again reaches of LCD screen.

(2) clear logic, the thought of simplifying circuit in the literary composition can reduce the decision logic circuit, thereby reaches the minimizing hardware costs, and time-delay also reduces slightly in addition.

Obviously, the present invention described here can have many variations, and this variation can not be thought and departs from the spirit and scope of the present invention. Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of these claims.

Claims

1. a LCD screen data interface circuit is characterized in that comprising a mode register and a data register; Described mode register is used for determining that LCD shields needed Format Type, and according to described Format Type, described data register recombinated the step-by-step of different pixels part, so that send to the LCD screen.

2. LCD as claimed in claim 1 screen data interface circuit is characterized in that described Format Type comprises one or more in following:

Read pixel source data, one time write operation sends;

Read pixel source data, write operation sends at twice;

Read pixel source data, divide three write operations to see off; With

Read two pixel source data, divide three write operations to see off.

3. LCD screen data interface circuit as claimed in claim 1 is characterized in that comprising the register that is used for determining the different pixels source data.

4. LCD screen data interface circuit as claimed in claim 1 is characterized in that a data register comprises an enable register that is respectively applied for R, G and B.

5. LCD screen data interface circuit as claimed in claim 1, the register that it is characterized in that comprising the register of the described different pixels of the storage position of highest significant position in described data register partly and store the number of significant digit of described different pixels part.

6. a LCD screen data interface method is characterized in that comprising and determines that LCD shields needed Format Type; According to described Format Type, the step-by-step of different pixels part is recombinated, so that send to the LCD screen.