KR100687327B1 - Circuit of color revision in liquid crystal display - Google Patents

Abstract

In the present invention, when a color is distorted by a peripheral part or the like in a liquid crystal display module, the color distortion is corrected by adding or subtracting an amount of a specific color as much as the distorted value to an input color signal by analyzing the color coordinates of the final output terminal. A color correction circuit of a liquid crystal display device. The color correction circuit of the liquid crystal display device of the present invention for implementing this, the interface unit for matching the signal input from the PC or notebook, and using the output signal of the interface unit sequentially on the X axis and Y axis of the liquid crystal display screen A timing controller for controlling a timing sequence for displaying data, a timing board portion having a output signal of the timing controller and a sequential control circuit for driving a liquid crystal display screen, and correcting a distorted color signal on the liquid crystal display screen. A compensation signal generator which generates a correction signal by switching the values of 'logic low' ('0') 'and' logic high ('1'), and generating a color signal and the correction signal output from the timing controller. A flash tone circuit unit for adding a corrected signal output from a negative part to output a corrected color signal, and the corrected color signal By including the input to a liquid crystal display screen, a digital / analog conversion board makes the analog voltage to be charged to a unit pixel of the unit it is characterized in that configured.

Description

Circuit of color revision in liquid crystal display

1 is a block diagram showing a conventional liquid crystal display device

2 is a block diagram showing a color correction circuit of the liquid crystal display device according to the present invention.

3 is a block diagram showing a correction signal generator 50 used in the present invention

4 is a block diagram showing the flash tone circuit unit 60 used in the present invention.

Explanation of symbols on the main parts of the drawings

10: interface unit 20: timing control unit

30: timing board portion 40: digital / analog conversion board portion

50: correction signal generator 60: flash tone circuit

62,64,68: Register 66: Summer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color correction circuit of a liquid crystal display (LCD) device. More particularly, when a color is distorted by a peripheral component in an LCD module, the color coordinates of the final output terminal are analyzed to determine the color distortion. The present invention relates to a color correction circuit of a liquid crystal display (LCD) device in which a color distortion phenomenon is corrected by adding or subtracting a specific color amount to or from an input color signal.

In general, a liquid crystal display (LCD) device is a display device in which a liquid crystal material is injected between two glass substrates and a voltage is applied from the outside to use the electro-optical characteristics of the liquid crystal. Liquid crystal display (LCD) devices are distinguished from other existing display devices in that they use light incident from the outside. The advantages of liquid crystal displays are that they can be made compact and thin and consume less power. Types of liquid crystal displays currently in use or under development include passively driven twisted nematics (TN), super twisted nematics (STN), and voltage controlled birefringence (ECB) using nematic liquid crystals. Controllable Birefringence (LCD) and Active-Driven Thin Film Transistor (TFT) LCDs, including Ferroelectric Liquid Crystals (FLCs) using Smectic Liquid Crystals, and Polymer Dispersible Liquid Crystals using scattering mode. PDLC; Polymer Dispersed Liquid Crystal).

1 is a block diagram of a conventional liquid crystal display (LCD) device, which includes an interface unit 10 for matching signals input from a PC or a notebook computer, and an X-axis and a Y-axis on the LCD screen 100 using the signals. A timing controller 20 for controlling a timing sequence for sequentially displaying data on the timing controller; and a timing board unit 30 which is an sequential control circuit for driving the LCD screen 100 with an output signal of the timing controller 20. And a digital / analog conversion for generating an analog voltage to be charged to the unit pixel of the LCD screen 100 with 6-bit data of red (R), green (G), and blue (B) from the timing controller 20. The board part 40 etc. are comprised.

However, in the conventional liquid crystal display (LCD) device having the above configuration, the color signal input to the LCD module is demodulated in the module to form color on the screen through the color filter together with the light of the back-lighter. At this time, when the color characteristics of the peripheral parts such as the back-lighter and the color filter are distorted, the final displayed color is distorted even if the color signal input into the module is faithfully demodulated. In general, color distortion phenomena called red (R), green (G) and green (B) are caused not only by the output signal itself but also by the color characteristics of the aforementioned peripheral components. That is, due to peripheral factors, a specific color is emphasized in the final display stage or a color distortion occurs when the specific color is weakly illuminated.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to analyze the color coordinates of the final output stage to determine the amount of a specific color as much as the distorted value when the color is distorted by peripheral components or the like in the LCD module. The present invention provides a color correction circuit of a liquid crystal display (LCD) device that corrects color distortion by adding or subtracting an input color signal.

In order to achieve the above object, the color correction circuit of the liquid crystal display device according to the present invention,

Interface unit matching signal input from PC and notebook,

A timing controller for controlling a timing sequence for sequentially displaying data on the X and Y axes of the liquid crystal display screen by using the output signal of the interface unit;

A timing board section which is an sequential control circuit for driving the liquid crystal display screen with an output signal of the timing control section;

A correction signal generator for switching the values of logic low ("0") and logic high ("1") to generate a correction signal in order to correct the distorted color signal on the liquid crystal display screen;
A flash tone circuit unit configured to add a color signal output from the timing controller and a correction signal output from the correction signal generator to output a corrected color signal;

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And a digital / analog conversion board unit configured to generate an analog voltage to be charged to a unit pixel of a liquid crystal display screen as the input of the corrected color signal.

In addition to the above configuration, it is preferable that the correction signal generator includes the same number of switching elements as the number of output bits.

The flash tone circuit unit may further include: first and second input registers respectively storing the color signal output from the timing controller and the corrected color signal output from the correction signal generator, and outputting in synchronization with a clock signal; And a summer register for adding data output from the first and second input registers, and an output register for storing the corrected signal output from the summer and outputting in synchronization with a clock signal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in all the drawings for demonstrating an embodiment, the thing with the same function uses the same code | symbol, and the repeated description is abbreviate | omitted.

2 is a block diagram of a color correction device of a liquid crystal display module (LCD) according to the present invention, which includes an interface unit 10 for matching signals input from a PC or a notebook computer, and an LCD screen 100 using the signals. A timing controller 20 for controlling a timing sequence for sequentially displaying data on the X and Y axes, and an sequential control circuit for driving the LCD screen 100 with an output signal of the timing controller 20. A digital / analog conversion board having a timing board section 30 and 6-bit data of demodulated red (R), green (G), and blue (B) and creating an analog voltage to be charged to a unit pixel of the LCD screen 100. The part 40 is comprised.

According to the present invention, when the color signals R, G, and B are weak and the color of the LCD screen 100 is distorted, a correction signal generator for generating a correction signal for correcting the corresponding color signal ( 50), 6-bit data of red (R), green (G), and blue (B) output from the timing controller 20, and corrected enemy (R) output from the correction signal generator (50), The flash tone circuit unit 60 further includes a six-bit signal of green (G) and blue (B), respectively, and outputs a six-bit signal corrected to the digital / analog change board unit 40.

3 is a view briefly showing the configuration of the correction signal generator 50 used in the present invention, which is an embodiment of generating a value with a 6-bit red correction signal r.

As shown in the figure, the correction signal generation section composed of the same number of switches s0 to s5 as the number of output bits r0 to r5 has a value of '0' or '1' by switching the switches corresponding to the respective bits. Generate a correction signal.

When the red (R) signal is weak and the color of the LCD screen is distorted, a corresponding red correction signal r may be generated by switching a switch. That is, as shown, in order to generate the 6-bit red correction signal r as the value [000011], the switches s0 and s1 for outputting the least significant bits r0 and r1 are connected to the power supply voltage Vcc so that the logic high ( Outputs " 1 ") and the remaining switches s2 to s5 are connected to the ground voltage Vss to output a logic low (" 0 ").

As such, when the red (R), green (G), or blue (B) signal is weak and distortion occurs on the LCD screen, the corresponding color signal is used to switch the correction signal generator 50. The color distortion phenomenon can be corrected by switching between them, so that the effect of accurately adjusting the white balance can be achieved.

FIG. 4 is a block diagram showing the flash tone circuit unit 60 used in the present invention, wherein a six-bit color signal output from the timing controller 20 (here, 'red (R)' is shown) (RED [ R5 ... R0]) and 6-bit correction signals red [r5 ... r0] output from the correction signal generator 50 as inputs, and are stored in the input registers 62, 64, respectively. The data stored in the input registers 62 and 64 are synchronized with the clock clk signal and then added by the summer 66 to output a corrected 6-bit signal [s5 ... s0]. The 6-bit signal [s5 ... s0] output from the summer 66 is stored in the output register 68 and finally output in synchronization with the clock clk signal. Similarly, the green (G) and blue (B) color signals are corrected in the same manner as described above.

As in the above embodiment, when the color signal (R, G, B) is weak and the color of the LCD screen 100 is distorted, a correction signal for correcting the corresponding color signal is made, and this correction signal and the By outputting the six-bit signal respectively corrected with the color signals R, G, and B output from the timing controller 20 to the digital / analog conversion board unit 40 so that the corrected signal is finally displayed on the LCD screen. The color signal is weak to prevent distortion.

As described above, according to the method and apparatus for correcting the color of the LCD module according to the present invention, the color distortion caused by the process of the final display (display) through a plurality of paths after the color signal data is generated in the LCD module It has the effect of precisely adjusting the white balance.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims. something to do.

Claims (3)

In the liquid crystal display device: An interface unit for matching a signal input from a PC or a notebook; A timing controller for controlling a timing sequence for sequentially displaying data on the X and Y axes of the liquid crystal display screen by using the output signal of the interface unit; A timing board unit having an output signal of the timing controller and a sequential control circuit for driving a liquid crystal display screen; A correction signal generator for switching a value of logic low ("0") and logic "high" ("1") to generate a correction signal to correct a color signal distorted on the liquid crystal display screen; A flash tone circuit unit for outputting a corrected color signal by summing a color signal output from the timing controller and a correction signal output from the correction signal generator; And A digital / analog conversion board unit for generating an analog voltage to be charged to a unit pixel of a liquid crystal display screen using the corrected color signal as an input Color correction circuit of the liquid crystal display device comprising a. The method of claim 1, The correction signal generator includes a number of switching elements equal to the number of output bits. Color correction circuit of liquid crystal display device. The method of claim 2, wherein the flash tone circuit unit, First and second input registers respectively storing color signals outputted from the timing controller and corrected color signals outputted from the correction signal generator, and outputting in synchronization with a clock signal; A summer for adding data output from the first and second input registers; An output register for storing the corrected signal output from the summer and outputting in synchronization with a clock signal Color correction circuit of the liquid crystal display device characterized by the above-mentioned.

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