KR20070000021A - Lcd-tv driving system and driving method thereof - Google Patents

Abstract

An LCD(Liquid Crystal Display) TV driving system and a driving method thereof are provided to change only a setting value of a selected display item without canceling an existing display mode. A TV system driving member(210) includes an OSD(On Screen Display) input processing member(212) for receiving and processing an OSD control signal. A micro-controller(214) performs data communication with the OSD input processing member and outputs a proper processing command related to the OSD control signal. The OSD input processing member discriminates whether the OSD control signal is a specific video display mode setting change signal or a specific display item setting change signal and outputs an inherent signal to a back light driving member(230) and an LCD driving member(220).

Description

Lcd driving system and driving method thereof {LCD-TV driving system and driving method}

The present invention relates to a liquid crystal TV, and more particularly, in a liquid crystal TV operated in a specific mode, even if a user changes a certain setting value, the driving system of the liquid crystal TV such that only the setting value is changed while the operation of the specific mode is continued; The driving method is related.

Among the display devices, in particular, liquid crystal displays have advantages of small size, thinness, and low power consumption, and are used as notebook computers, office automation devices, and audio / video devices. In particular, an active matrix liquid crystal display device using a thin film transistor (hereinafter referred to as "TFT") as a switch element is suitable for displaying a dynamic image.

FIG. 1 is a block diagram showing a basic configuration of a general liquid crystal display device, and is largely divided into a liquid crystal panel 2 and an LCM driving circuit unit 26.

In each configuration, the interface 10 includes data (RGB Data) and control signals (input clock, horizontal synchronizing signal, vertical synchronizing signal, data enable) input to the LCM driving circuit unit 26 from a driving system such as a personal computer. Signals) and the like are supplied to the timing controller 12. Low voltage differential signal (LVDS) interface and TTL interface are mainly used for data and control signal transmission from the drive system. In addition, the interface function may be collected and used together with the timing controller 12 in a single chip.

As illustrated in FIG. 2, the liquid crystal panel 2 forms a plurality of pixel regions by crossing a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn on a glass substrate. In the region, a thin film transistor TFT and a liquid crystal LC are configured to display a screen.

The timing controller 12 drives the data driver 18 composed of a plurality of drive integrated circuits and the gate driver 20 composed of a plurality of gate driver integrated circuits using a control signal input through the interface 10. Generate a control signal for In addition, the data input through the interface 10 is transmitted to the data driver 18.

The reference voltage generator 16 generates reference voltages of a digital to analog converter (DAC) used in the data driver 18. Reference voltages are set by the producer based on the transmittance-voltage characteristics of the panel.

The data driver 18 selects reference voltages of the input data in response to control signals input from the timing controller 12, and supplies the selected reference voltage to the liquid crystal panel 2 to control the rotation angle of the liquid crystal molecules.

The gate driver 20 performs on / off control of thin film transistors TFTs arranged on the liquid crystal panel 2 in response to control signals input from the timing controller 12. The gate driver 20 controls gates on the liquid crystal panel 2. By sequentially enabling the lines GL1 to GLn by one horizontal synchronizing time, the thin film transistors TFT on the liquid crystal panel 2 are sequentially driven by one line, so that analog image signals supplied from the data driver 18 It is applied to the pixels connected to the thin film transistors (TFTs).

The power supply voltage generator 14 supplies operating power of each component and generates and supplies a common electrode voltage of the liquid crystal panel 2.

The liquid crystal display device operated through the basic configuration as described above has recently been released as a liquid crystal TV in combination with a TV system, such a liquid crystal TV, such as "comfortable image mode", "clear image mode", etc. It is common to provide a video display mode.

In addition, the LCD TV is driven by various image display modes for the user's convenience, such as "comfortable image mode" and "sharp image mode", as described above. When brightness adjustment is performed, the LCD TV turns off a specific image display mode that is being performed, switches to a normal image display mode, performs brightness adjustment according to user adjustment, and then displays the adjusted display. Maintaining the screen is a common operating characteristic.

3 is a block diagram showing a liquid crystal TV driving system 100 for explaining a general user adjustment operation of the liquid crystal TV. Basically, the liquid crystal TV driving system 100 is a TV system driving unit 110 providing an OSD function. ) And an LCD driver 120 for displaying image data for a TV, and a backlight driver 130 for providing back light necessary for displaying an image of the LCD driver 120.

In this case, the backlight driver 130 may be included in the TV system driver 110 or the LCD driver 120 according to the efficiency and convenience of the drive system design.

The TV system driver 110 communicates data with the OSD input processing unit 112 and the OSD input processing unit 112 to receive and process an OSD setting change signal, and issues an appropriate processing command to the input OSD setting change signal. A microcontroller 114 is provided.

The OSD input processor 212 receives and processes an OSD control signal (OCS) output from an external device (for example, a remote controller), and the input OSD setup change signal OCS is input. It determines whether a specific video display mode setting signal (hereinafter referred to as "A") or a setting change signal (hereinafter referred to as "B") of a specific display item and the input OSD setting change signal (OCS) is set to one video display mode. In the case of the signal A, a unique signal (hereinafter referred to as "C") differently set for each image display mode is output to the backlight driver 130 and the LCD driver 120, and the input OSD setting change signal OCS Transmits a setting change request signal (D) to the microcontroller 114 for both the image display mode setting signal (A) and the setting change signal (B) of the one display item.

The microcontroller 114 outputs a backlight control voltage change signal (hereinafter referred to as "E") to the LCD driver 120 according to the setting change request signal (D).

The LCD driver 120 receives an image data to be displayed and performs an operation for displaying it on a screen. Referring to the configuration, the LCD driver 120 outputs the unique signal C output from the OSD input processor 112 and the microcontroller 114. An operation driver 122 that receives the backlight control voltage change signal E outputted from and calculates a set value of the display item in association with the image data, and a plurality of image display mode display items of the operation driver 122 And a memory unit 124 for storing setting values and setting values of display items calculated separately. Here, the illustrated memory unit 124 is a memory device such as an EEPROM. In addition, the operation driver 122 may perform a calculation function using a timing controller and may be included in the same IC as the timing controller.

The operation driver 122 calculates a setting value of a display item in association with image data inputted to the inherent signal C or the backlight control voltage change signal E output from the OSD input processor 112 and calculates the set value of the display item. The result is stored in the memory unit 124 and the backlight control voltage output command F according to the calculation result is output to the backlight driver 130. At this time, the image data in which the setting value of the display item is calculated in association with the image data is from at least 1 frame to at most 8 frames.

The backlight driver 130 may be configured to output a unique signal C for each image display mode output by the image display mode setting signal A determined by the OSD input processor 112 and the backlight control voltage change signal E. FIG. The backlight control voltage output command F is outputted to the inverter to control the backlight driving and outputs the backlight control voltage V _BR .

However, in the LCD TV driven by the above operation algorithm, the user inputs a setting change signal (B) of one display item, for example, a screen brightness adjustment command, by a means such as a remote controller to arbitrarily change the brightness of the image. In the case of the adjustment, the brightness adjustment is performed in a state in which the specific image display mode that has been operated is released and the state is switched to the normal image display mode. That is, the user is restricted from watching various video display modes because the display brightness is adjusted by using the stored reference settings instead of being applied to the specific video display mode. have.

The present invention has been made to solve the above problems, and even if the brightness of the image is controlled by the user's OSD mode control, the specific image display mode is not released, the driving of the liquid crystal TV is properly applied to the brightness of the adjusted image The purpose is to propose a system and its driving method.

In order to achieve the above object, the present invention provides one or more video display modes in which an OSD function is provided to enable a user to change a set value of each of a plurality of display items, and a predetermined value of the plurality of display items is predetermined. A method of driving a liquid crystal TV, comprising: adjusting the setting value of one display item through the OSD function during operation in the image display mode, and adjusting only the setting value of the display item while the operation in the image display mode is continued. A liquid crystal TV driving method is provided.

In the driving method, the setting value adjustment value of the one display item is adjusted by being applied directly to the setting value of the corresponding display item of the image display mode in operation.

In the driving method, the display item whose setting value is adjusted is the screen brightness.

In another aspect, the present invention provides a drive system for a liquid crystal TV that provides an OSD function so that the user can change the set value of each of the plurality of display items, and provides one or more image display modes in which the set values for the plurality of display items are predetermined. For example, if the setting value of one display item is adjusted through the OSD function during the operation of the video display mode, the LCD display may be adjusted while the operation of the video display mode is continued. Present the system.

In the driving system, the setting value adjustment value of the one display item is directly applied to the setting value of the corresponding display item of the image display mode in operation.

In the driving system, the display item whose setting value is adjusted is screen brightness.

Hereinafter, the present invention having the characteristics as described above will be described in detail with reference to the accompanying drawings.

Figure 4 is a block diagram showing the configuration of a liquid crystal TV driving system according to an embodiment of the present invention.

The LCD TV driving system 200 is largely composed of a TV system driver 210, an LCD driver 220, and a backlight driver 230. In this case, the backlight driver 230 may be included in the TV system driver 210 or the LCD driver 220 according to the efficiency and convenience of the driving system design.

In the present invention described below, the same reference numerals are used for signals having the same function as the above-described prior art.

The TV system driving unit 210 receives an OSD control signal (OSD), and inputs and processes the OSD input processing unit 212 and the OSD input processing unit 212 to communicate with each other to set the input OSD. The microcontroller 214 is provided with an appropriate processing instruction for the change signal OCS.

The OSD input processing unit 212 receives an OSD setting change signal (OCS) output from an external device (eg, a remote controller), and the input OSD setting change signal (OCS) is a specific image display mode setting change signal. It is determined whether it is (A) or a setting change signal B of a specific display item, and when the input OSD setting change signal OCS is one video display mode setting signal A, a unique signal set to be output for each video display mode (hereinafter, Display " C ") to the backlight driver 230 and the LCD driver 220, and display the same as when the input OSD setting change signal OCS is a specific image display mode setting change signal A. The setting change request signal D is output to the microcontroller 214 for all of the setting change signal B of the item.

The microcontroller 214 receives and determines the setting change request signal D, and outputs a unique signal C according to the setting change request signal D when the setting change request signal D is an image display mode setting signal A. FIG. A signal command is sent to the OSD input processing unit 212, and a first backlight control voltage change signal E1 and a second backlight control voltage change signal E2 according to the setting change request signal D are output.

In this case, the first backlight control voltage change signal E1 is a signal that is output when the setting change request signal D is one image display mode setting signal A, and the second backlight control voltage change signal E2. Denotes a signal output when the setting change request signal D is a setting change signal B of one display item.

The LCD driver 220 receives an image data to be displayed and displays an image on a screen. The LCD driver 220 outputs a unique signal C output from the OSD input processor 212 and the microcontroller 214. A first operation driver 222 that receives a first backlight control voltage change signal E1 and calculates a set value of a display item in association with the image data, and changes the second backlight control voltage output from the microcontroller 214. A second operation driver 224 which receives a signal E2 and performs an additional operation on a display item setting value by the operation of the first operation driver 222, and the first and second operation driver 222 ( And a memory unit 226 for storing a calculation result of the display item setting value of 224. In this case, the first and second operation drivers 222 and 224 may perform a calculation function using a timing controller, and may be included in the same IC as the timing controller.

The first operation driver 222 receives the intrinsic signal C and the first backlight control voltage change signal E1 output from the OSD input processor 212 and sets each display item of the corresponding video display mode. A value is calculated in association with the image data, the operation result is stored in the memory unit 226, and at the same time, a first backlight control voltage output command F1 is output to the backlight driver 230 according to the operation result. . At this time, the image data in which the setting value of the display item is calculated in association with the image data is from at least 1 frame to at most 8 frames.

The second operation driver 224 counts a second backlight control voltage change signal E2 input from the microcontroller 214 to perform an additional operation on a display item whose set value is to be changed. The display is performed based on a display item setting value by the operation of the first operation driver 222 stored in the memory unit 226 to output a second backlight control voltage output command F2 to the backlight driver 230.

The memory unit 226 stores a setting value for each display item of the image display mode stored in the first operation driver, and in particular the display brightness item for the display item stored in the second operation driver 224. Provides a set value for Here, the illustrated memory unit 226 is a memory device such as an EEPROM.

The backlight driver 230 is a unique signal (C) for each image display mode and the first and second backlight control voltage change signals outputted by the image display mode setting signal (A) determined by the OSD input processor (212). Backlight operation is performed by generating the backlight control voltages V _{BR_1} and V _{BR_2 by} receiving the first and second backlight control voltage output commands F1 and F2 calculated in connection with the image data after receiving (E1, E2). Output to a controlling inverter circuit (not shown).

Hereinafter, a driving method of a liquid crystal TV driving system according to an exemplary embodiment of the present invention described above will be described.

When the OSD setting change signal OCS input by the user is input to the OSD input processing unit 212, the OSD input processing unit 212 determines whether the OSD setting change signal OCS is a specific image display mode setting signal A. Alternatively, it is determined whether the setting change signal B is for a specific display item.

As a result of the determination, in the case of the specific image display mode setting signal A, for example, in the case of the "sharp image" mode setting signal, the backlight driver 230 transmits a unique signal C for adjusting the screen brightness for the "sharp image". ) And the first operation driver 222. In this case, the screen brightness level that can be output as the unique signal (C) is composed of a plurality of stages according to the designer, for example, as shown in Table 1, the setting value between the darkest screen brightness and the brightest screen brightness The screen brightness setting value is divided into 256 and designated as a plurality of DAC steps (exemplified in 32 steps) for the screen brightness setting value, and the screen brightness setting value corresponding to each step is calculated by the first operation driver 222 and the The backlight driver 230 is output in the form of a first backlight control voltage output command F1. Equation (1) below illustrates an operation equation performed by the first operation driver 222, and the displayed DAC sets the screen brightness of the step level of the inherent signal C output from the OSD input processor 212. As a value, for example, when the step level of the inherent signal C in the " sharp picture " mode is DAC_20, V _{BR_1} = (207/255) X3.3? 2.68V. Accordingly, the backlight control voltage of 2.68V is output to the inverter circuit through the backlight driver 230 to adjust the brightness of the backlight.

DAC_00 20 DAC_11 158 DAC_22 216 DAC_01 54 DAC_12 164 DAC_23 220 DAC_02 74 DAC_13 170 DAC_24 224 DAC_03 88 DAC_14 176 DAC_25 228 DAC_04 101 DAC_15 182 DAC_26 232 DAC_05 111 DAC_16 187 DAC_27 236 DAC_06 121 DAC_17 192 DAC_28 240 DAC_07 129 DAC_18 197 DAC_29 244 DAC_08 137 DAC_19 202 DAC_30 248 DAC_09 145 DAC_20 207 DAC_31 251 DAC_10 152 DAC_21 211 DAC_32 255

                          Table 1.

Equation (1) V _{BR_1} , V _{BR_2} = (DAC / 255) X3.3

Thereafter, when a setting change signal B of a specific display item such as screen brightness is input to the OSD input processor 212, the OSD input processor 212 transmits a processing request to the microcontroller 214. In addition, the microcontroller 214 outputs a second backlight control voltage change signal E2 to the second operation driver 224.

The second operation driver 224, which has received the second backlight control voltage change signal E2 from the microcontroller 214, counts the number of inputs of the change signal D, and counts the counted second backlight control voltage change signals. The second backlight control voltage output command F2, which is calculated using Equation (1), by adding or subtracting the step-by-step (E2) coefficient, is output to the backlight driver 230. In other words, when the screen brightness is controlled by the step level DAC_20 in the above-described "sharp image", when the coefficient of the second backlight control voltage change signal E2 input is 2, the screen brightness becomes the step level of DAC_22. Will be changed further. Accordingly, the second backlight control voltage V _{BR_2} output from the backlight driver 230 becomes V _{BR_2} = (216/255) X3.3 ≒ 2.79V, thereby maintaining the display setting of the existing "sharp image". Only the brightness item can be provided with the screen whose setting is changed.

FIG. 5 shows a screen brightness adjustment curve AA for each 32 steps of driving one video display mode for a screen brightness item providing 256 set values, and two steps of user adjustment when driving the one video display mode. This is a diagram showing the desired value of the screen brightness setting value when the screen brightness increase (BB) and the two-step screen brightness decrease (CC) adjustment are made. Even if the screen brightness is changed during the operation of a specific video display mode, the image display mode in operation is not displayed. In addition to the basic concept of the present invention in which the item setting value of the display mode is additionally applied without being released, the setting value is changed. More preferably, the higher the brightness of the screen, the smaller the width of the additional setting value is applied. It is a diagram for presenting an application drive for displaying a screen.

The LCD system and the driving method thereof according to the present invention described above are driven even if the setting value of a plurality of display items is changed even when the setting value of a specific display item is changed by the user's OSD input during the driving of the predetermined display mode. Since the display mode is not released and only the setting value of the display item selected for the change is additionally changed, the user can use the display mode service continuously.

1 is a block diagram showing the basic configuration of a general liquid crystal display device

FIG. 2 is a view schematically illustrating a configuration of a liquid crystal panel among the components of FIG. 1.

3 is a block diagram showing a liquid crystal TV driving system for explaining a user adjustment operation in a general liquid crystal TV;

Figure 4 is a block diagram showing the configuration of a liquid crystal TV driving system according to an embodiment of the present invention

5 is a graph showing a change in screen brightness setting values for explaining the basic concept and application of the liquid crystal driving method according to the present invention;

<Brief description of the main parts of the drawing>

200: LCD TV drive system 210: TV system drive unit

220: LCD driver 230: backlight driver

212: OSD input processor 214: microcontroller

222: first operation drive unit 224: second operation drive unit

226: Memory unit V _{BR_1} , V _{BR_2} : First and second backlight control voltages

Claims (6)

A driving system of a liquid crystal TV which provides an OSD function to enable a user to change a set value of each of a plurality of display items and provides one or more image display modes in which the set values of the plurality of display items are predetermined. If the setting value of one display item is adjusted through the OSD function during the operation of the video display mode, the operation of the video display mode is continued and only the setting value of the corresponding display item is adjusted. The method according to claim 1, The set value adjustment value of the one display item is directly applied to the setting value of the corresponding display item of the image display mode in operation and is adjusted. The method according to any one of claims 1 and 2, The display item whose setting value is adjusted is the LCD brightness. A driving method of a liquid crystal TV which provides an OSD function to enable a user to change a set value of each of a plurality of display items and provides one or more image display modes in which the set values of the plurality of display items are predetermined. When the setting value of one display item is adjusted through the OSD function during the operation of the video display mode, the operation of the video display mode is continued and only the setting value of the corresponding display item is adjusted. The method according to claim 4, The set value adjustment value of the one display item is directly applied to the set value of the corresponding display item of the image display mode in operation, characterized in that the LCD TV driving method The method according to any one of claims 4 and 5, The display item whose setting value is adjusted is the LCD brightness.