KR900001338Y1 - Color regeneration picture devices for color monitor - Google Patents

Abstract

No content.

Description

Color reproduction imaging device for color monitors

1 is a circuit diagram of the device of the present invention.

2 is a circuit diagram of a color reproduction imaging apparatus for a conventional color monitor.

3 is a monitor reproduction color chart according to a 16-color input video signal.

* Explanation of symbols for main parts of the drawings

1,2,3: Red, Green, Blue Input 4: Luminance Input

5-8: Inverter 9,10: NAND Gate

11-13: Color Output

The present invention relates to a color reproduction imaging apparatus for color reproduction of a TTL level color monitor, and more particularly, to a color composite reproduction imaging apparatus for dark brown reproduction.

Conventionally, as shown in FIG. 2, the red, green, blue, and luminance input terminals of a color reproduction circuit composed of a plurality of inverters 31-39, diodes D ₁ -D ₁₁ , and transistors Q ₁ -Q ₃ . 16 colors are reproduced by applying a combinational logic signal to (40-43) as shown in FIG. 3, but in such a conventional circuit, a base input to the base of the green output transistor Q ₂ is particularly used to reproduce dark brown. Reducing the current reproduces dark brown, but varying the base current of the transistor not only increases the noise, but also adjusts the base current to the resistance component.

That is, in order to reproduce the brown color, a 'low' signal is applied to the luminance input terminal 43 and the blue input terminal 42 and a "high" signal is applied to the red and green input terminals 40 and 41 as shown in FIG. Is approved.

Therefore, the cathodes of diodes D ₅ and D ₆ are 'low' so that the current applied to the base of transistors Q ₁ and Q ₂ is reduced and the cathode potential of diode D ₁ is low. Since the current applied to the base of the image amplifying transistor Q ₂ through the resistor R ₁₀ is reduced to be smaller than the current applied to the base of the transistor Q ₁ , dark brown is reproduced.

In other words, if the amount of current flowing into the base of the transistors Q ₁ and Q ₂ is A and B, yellow is reproduced when A: B = 1: 1, and brown is reproduced when A: B = 1 / 1/2: 1/3 However, these conventional circuits have the disadvantages as pointed out above.

Therefore, in order to solve this disadvantage, the present invention controls the gain of the image amplification transistor by adding or subtracting the emitter current of the image amplification transistor to reproduce a predetermined color, thereby suppressing noise generation and at the same time color characteristics of all products. It is an object of the present invention to provide a color monitor for reproducing a color monitor that can be made constant, the following describes the configuration and operation of the present invention with reference to the accompanying drawings.

Referring to FIG. 1, the device of the present invention is composed of red, green, and blue inputs (1, 2, 3) and luminance input (4), distribution resistors (R ₁ -R ₈ ), and an inverter (5-8). In a color reproduction imaging apparatus comprising an input stage (a) and an image output stage (b) consisting of transistors (T _r1 -T _r3 ), the connection points of the resistors (R ₂ , R ₄ ) and the inverters (5, 6) and half The outputs of electricity (7, 8) are connected to the inputs of the NAND gate 9, respectively, and the output of the NAND gate 9 is connected to the input of one side of the NAND gate 10, but through a resistor (R ₉ ) B ⁺ ), and the other input of the NAND gate 10 is connected to the connection point of the resistor (R ₂ ) and the inverter (5) and the power supply (B ⁺ ), respectively, the output of the inverter (5,6) Is connected to the emitter of transistors T _r1 -T _r2 , the output of inverter 7 is connected to the emitter of transistor T _r3 via diode D ₂ , and the output of inverter 8 is Through the diode D ₁ to the emitter of the transistor T _r1 and Connect to the emitters of transistors T _r2 -T _r3 and at the same time connect the power supply B ⁺ to the outputs of the inverters 7 and 8 and output the collectors of transistors T _r1 -T _r3 to their respective color outputs. (11-13), but the base is connected to the contrast stage, the effect of this configuration is to combine the logic signal of the combination as shown in Figure 3 red, green, blue input (1, 2, 3) When the red image signal is inputted to the red input 1, the red image signal is inputted to the emitter of the transistor T _r1 .

The inverter 5 here is, for example, of an open collector type, the output level of which depends on the base voltage of the transistor T _r1 .

Thus, the base voltage is connected to the contrast stage to adjust the contrast.

When the red signal is input, when the output of the inverter 1 goes low and the base potential of the transistor T _r1 becomes high, the collector current increases but the magnitude of the output voltage obtained decreases.

In FIG. 3, the blue (B) input and the luminance (I) inputs (3,4) become 'low', and the red (R) and green (G) inputs (1,2) are reproduced as shown in division 7 in FIG. ) Becomes 'high' to reduce the amplification of the transistor (T _r2 ) to reproduce the dark brown, which will be described in more detail as follows.

First, in FIG. 1, the amplification degree G ₁ of the transistor T _r1 is set to have a resistance value of approximately 0.51 times as G1 = R ₁₆ / R ₁₃ .

At this time, the base potential of the transistor T _r1 input from the contrast stage is changed within the range of 5.1 V to 3.6 V so that the output terminal 11 of the transistor T _r1 obtains an output of 2.55 C to 1.8 V.

Therefore, in order to reproduce the dark brown color as shown in Section 7 in FIG. 3, the red (R) and green (G) inputs (1, 2) are 'high', and the blue (B) and luminance (I) inputs (3, 4). In this 'low' state, the 'high' signal is input to all four input terminals of the NAND gate 9 where each color input combination is input (in this case, B ⁺ (high) power is applied to one input terminal). ) Output terminal signal is 'low' is input to one input terminal of the NAND gate 10, so the output terminal signal of the NAND gate 10 is 'high'.

In this state, the amplification of the transistor, so that (the output of the inverter 6, low state), the resistance (R _11), only the ground side to the emitter teocheuk of (T _r2) connected in an equivalent case transistor (T _r2) Figure (G ₂ ) Sets the resistance (R ₁₇ ) and (R ₁₄ ) values so that G ₂ = R ₁₇ / R ₁₄ = 0.33.

On the other hand, when an image signal other than the brown reproduction condition is input, the output terminal signal of the NAND gate 9 is always in a 'high' state.

This is because the condition that the output of the NAND gate 9 is 'low' is a brown reproduced image input condition (i.e., red (R) and green (G) inputs are 'high', blue (B) and luminance (I)). The condition that the input is 'low').

Therefore, in this case the output signal of the NAND gate 9, the input signal is a NAND gate 10. Since the high state, all of the 'low' is a in this case, the transistor (T _r2), the emitter to the resistor (R ₁₄₎ and a resistor teocheuk of ( Since R ₂₂ ) is equivalent to the ground side (ie parallel connection), the amplification degree (G ₂ ') of transistor (T _r2 ) is G ₂ ' = R ₁₇ / R ₂₂ / R ₁₁ = 0.51, approximately 0.51 The resistances R ₁₇ , R ₁₄ , and R ₂₂ are set to have a double.

That is, except for an input condition for reproducing dark brown as shown in division 7 in FIG. 3, the amplification degree of the transistor T _r2 is equal to the amplification degree of the transistors T _r1 and T _r3 , so that the resistance values R _{13 to} R ₁₈ are different from each other. (R ₂₂ , R ₂₃ ) is set.

As a result, when an image signal for reproducing brown is input, the amplification degree of the transistor T _r2 is decreased from 0.51 times to 0.39 times, thereby reproducing a dark brown color.

As described above, according to the present invention, the transistor amplification factor is controlled by adding or subtracting the emitter potential, thereby suppressing the occurrence of noise and at the same time reproducing a dark brown color.

Claims (1)

Color reproduction imaging device including red, green and blue inputs and luminance inputs, distribution resistors (R _4- R ₈ ) and input stages (a) consisting of an inverter and an image output stage (b) consisting of transistors (T _r1 , T _r3 ) In R, the connection points of resistors R ₂ and R ₄ and inverters 5 and 6 and the outputs of inverters 7 and 8 are connected to the inputs of the NAND gate 9 respectively, The output is connected to one input of the NAND gate 10, but is connected to the power supply B ⁺ through a resistor R ₉ , and the remaining inputs of the NAND gate 10 are connected to the resistor R ₂ and the inverter 5. Connect the connection point and the power supply B ⁺ , respectively, the outputs of the inverters 5 and 6 are connected to the emitters of the transistors T _r1 and T _r2 , and the output of the inverter 7 is the transistor T _r3 . Is connected to the emitter of through a diode D ₂ , the output of the inverter 8 through the diode D ₁ to the emitter of the transistor T _r1 and to the emitters of the transistors T _r2 and T _r3 . To a computer At the same time, the power (B ⁺ ) is connected to the output of the inverter (7,8), and the collectors of the transistors (T _r1 , T _r3 ) are connected to the respective color outputs (11-13), and the base is Reproduction device for color monitors.