TWI478572B - Over-driven topology structure of rgb signal - Google Patents

Description

RGB signal overdrive topology

The present invention relates to an RGB (red, green, blue, red, green, blue) signal overdrive topology.

In most electronic products, image transmission is mainly done by transmitting RGB signals. In the RGB signal transmission process, the conventional RGB signal overdrive topology structure performs impedance matching required for RGB signal transmission near the RGB signal transmitting end, and generates an overdrive effect near the RGB signal receiving end, but such RGB The signal overdrive topology makes the rising rate of the RGB signal and the amplitude of the RGB signal still unsatisfactory, which affects the effect of image transmission.

In view of the above, it is necessary to provide an RGB signal overdrive topology to increase the rate of rise of the RGB signal and the amplitude of its amplitude.

An RGB signal overdrive topology includes a signal transmitting end for transmitting an RGB signal and a signal receiving end for receiving an RGB signal, the signal receiving end includes a first resistor, and the signal transmitting end is connected in series through a plurality of segments The transmission line is connected to the signal receiving end, and the impedance value of the first transmission line near the signal transmitting end is smaller than the impedance value of the second transmission line near the signal transmitting end, so as to form an overdrive structure near the signal transmitting end, such At least one of the connection points between the segment transmission lines is grounded through a resistor whose equivalent resistance value is equal to the resistance value of the first resistor.

The RGB signal overdrive topology of the present invention forms an overdrive structure close to the signal transmitting end to generate an overdrive effect, thereby increasing the rising rate of the RGB signal and the amplitude of the amplitude.

Referring to FIG. 1, a first preferred embodiment of the RGB signal overdrive topology of the present invention includes a signal transmitting terminal 10, a signal receiving terminal 20, and first to fourth segment transmission lines 31-34. The signal transmitting end 10 is used to transmit RGB signals. The signal receiving end 20 is configured to receive the RGB signal. The signal transmitting end 10 is connected to a first connection point A through the first segment transmission line 31. The first connection point A is connected to a second connection point B through the second transmission line 32. The second connection point B is grounded through a resistor R1 and connected to a third connection point C through the third transmission line 33. . The third connection point C is grounded through a resistor R2 and connected to the signal receiving end 20 through the fourth segment transmission line 34. In the overdrive topology, the length of the first transmission line 31 is smaller than the length of the second transmission line 32, and the length of the third transmission line 33 is greater than the length of the fourth transmission line 34. The first transmission line 31 The width of the transmission line 32 is greater than the impedance of the first transmission line 31.

In the present embodiment, according to the transmission specification of the RGB signal, the impedance value Z1 of the first transmission line 31 connected to the signal transmitting end 10 is 37.5 Ω. Since the impedance value of the second transmission line 32 is greater than the impedance value of the first transmission line 31, the impedance value of the second transmission line 32 is set to Z2=50 Ω, so that overdrive is generated at the first connection point A to generate The overdrive effect, the so-called overdrive effect, is directly connected to the higher impedance transmission line by a lower impedance transmission line. The impedance value Z3 of the third transmission line 33 is set to 50 Ω, and the impedance value of the fourth transmission line 34 is set to Z4=75 Ω. Since the signal transmitting end 10 includes a current source I, the signal receiving end includes a resistor R3. The resistance value is 75 Ω, and the resistance values of the resistors R1 and R2 are selected to be 150 Ω.

In other embodiments, the impedance value Z2 of the second transmission line 32, the impedance value Z3 of the third transmission line 33, the resistance value of the resistor R1, the impedance value Z4 of the fourth transmission line 34, and the resistance R2. The resistance value can be set to other values as needed. The first and second transmission lines 31 and 32 can also be made of different materials, as long as the impedance value Z2 of the second transmission line 32 is greater than the impedance value of the first transmission line 31. Z1=37.5Ω to form an overdrive structure at the first connection point A, and the equivalent resistance value of the resistors R1 and R2 in parallel is 75Ω to meet the amplitude requirement.

Referring to FIG. 2, a second preferred embodiment of the RGB signal overdrive topology of the present invention includes a signal transmitting terminal 10, a signal receiving terminal 20, and fifth to seventh segment transmission lines 35-37. The signal transmitting end 10 is connected to a fourth connection point D through the fifth segment transmission line 35. The fourth connection point D is connected to a fifth connection point E through the sixth transmission line 36. The fifth connection point E is grounded through a resistor R4 and connected to the signal receiving end 20 through the seventh transmission line 37. In the above overdrive topology, the length of the sixth segment transmission line 36 is greater than the length of the fifth segment transmission line 35 and the seventh segment transmission line 37. The impedance value of the fifth transmission line 35 is Z5 = 37.5 Ω. The impedance value Z6 of the sixth transmission line 36 is set to 50 Ω, and the impedance value of the seventh transmission line 37 is Z6 = 75 Ω. The resistance of the resistor R4 is 75 Ω.

In other embodiments, the number of segments and the length of the transmission line can be increased or decreased as needed, or the number of resistors can be increased or decreased as needed, as long as the equivalent resistance value after all the resistors are connected in parallel is equal to 75 Ω, close to the signal transmitting end. The impedance value of the second transmission line of 10 may be greater than the impedance value of the first transmission line adjacent to the signal transmission end 10.

Please refer to FIG. 3 , which is a comparison diagram of simulated waveforms of RGB signals received by the signal receiving end in the first and second preferred embodiments of the RGB signal overdrive topology of the present invention and simulated waveforms of conventional RGB signals. The curves 100, 110, and 120 are respectively the first and second preferred embodiments and the conventional RGB signal simulation curves. As can be seen from FIG. 3, the RGB signal simulation curves of the first and second preferred embodiments are shown. The rising rate and amplitude of 100 and 110 are greater than the conventional RGB signal simulation curve 120. Therefore, the overdrive is formed near the signal transmitting end 10. The rising rate of the RGB signal increases, and the amplitude of the RGB signal increases.

The RGB signal overdrive topology of the present invention forms an overdrive architecture at the first connection point A and the fourth connection point D by setting the impedance value of the first transmission line to be smaller than the impedance value of the second transmission line. Thereby increasing the rising rate of the RGB signal and the amplitude of the amplitude.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

8‧‧‧Data Storage Control System
10‧‧‧Electronic equipment
20‧‧‧SD card
30‧‧‧ Hard disk drive
40‧‧‧Display equipment
102‧‧‧Switching device detection module
104‧‧‧First Storage Switching Module
106‧‧‧Display module
108‧‧‧Storage Device Detection Module
110‧‧‧Second storage switching module

1 is a schematic diagram of a first preferred embodiment of an RGB signal overdrive topology of the present invention.

2 is a schematic diagram of a second preferred embodiment of the RGB signal overdrive topology of the present invention.

FIG. 3 is a comparison diagram of simulated waveforms of RGB signals received by the signal receiving end of FIG. 1 and FIG. 2 and simulated waveforms of RGB signals received by a conventional signal receiving end.

10‧‧‧Signal sender

20‧‧‧Signal Receiver

31‧‧‧First transmission line

32‧‧‧second transmission line

33‧‧‧3rd transmission line

34‧‧‧fourth transmission line

I‧‧‧current source

A‧‧‧First connection point

B‧‧‧second connection point

C‧‧‧ third connection point

R1, R2, R3‧‧‧ resistance

Claims (8)

An RGB signal overdrive topology includes a signal transmitting end for transmitting RGB signals and a signal receiving end for receiving RGB signals. The signal receiving end includes a first resistor, and the improvement is: the signal transmitting end transmits A plurality of serially connected transmission lines are connected to the signal receiving end, and an impedance value of the first transmission line adjacent to the signal transmitting end is smaller than an impedance value of the second transmission line adjacent to the signal transmitting end to form an overdrive near the signal transmitting end. The at least one connection point of the connection point between the plurality of transmission lines is grounded through a resistor, and the equivalent resistance value of the resistor is equal to the resistance value of the first resistor. The RGB signal overdrive topology as described in claim 1, wherein the width of the first transmission line is greater than the width of the second transmission line. The RGB signal overdrive topology as described in claim 1, wherein the transmission line includes first to third transmission lines, and the signal transmission end is connected to a first connection point through the first transmission line, the first The connection point is connected to a second connection point through the second transmission line, the second connection point is grounded through the second resistor, and is connected to the signal receiving end through the third segment transmission line, and the resistance value of the second resistor is equal to the The resistance value of the first resistor. The RGB signal overdrive topology as described in claim 3, wherein the resistance values of the first resistor and the second resistor are both 75 Ω. The RGB signal overdrive topology as described in claim 3, wherein the length of the second transmission line is greater than the length of the first and third transmission lines. The RGB signal overdrive topology as described in claim 1, wherein the transmission line includes first to fourth transmission lines, and the signal transmission end is connected to a first connection point through the first transmission line, the first The connection point is connected to a second connection point through the second transmission line, the second connection point is grounded through a second resistor, and is connected to a third connection point through the third transmission line, and the third connection point is transmitted through a third connection point The third resistor is connected to the signal receiving end through the fourth connecting line. The equivalent resistance of the second resistor in parallel with the third resistor is equal to the resistance of the first resistor. For example, in the RGB signal overdrive topology described in claim 6, wherein the resistance of the first resistor is 75 Ω, and the resistance values of the second resistor and the third resistor are both 150 Ω. The RGB signal overdrive topology as described in claim 6, wherein the length of the first transmission line is less than the length of the second transmission line, and the length of the third transmission line is greater than the length of the fourth transmission line.