JP3922586B2 - liquid crystal television - Google Patents

Description

  The present invention relates to a liquid crystal television, and more specifically, a chip including a video processor to which at least an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a timing controller for controlling a liquid crystal driving unit of the liquid crystal panel. The present invention relates to an IC liquid crystal television.

A video display device has been proposed in which a test pattern to be displayed is changed by changing a set value of a register in a control circuit when inspecting a defect in a liquid crystal panel or a drive circuit (for example, Patent Document 1). Specifically, using the seven registers AAA to GGG, for example, the setting value of the register AAA is changed from “000” to “055”, the setting value of the register DDD is changed from “005” to “042”, and the register FFF When the set value is changed from “033” to “063”, the display is changed from the standard pattern to an arbitrary inspection pattern. In this case, the setting value of the register is changed by a control signal stored in advance in the memory of the microcomputer, thereby eliminating the trouble of individually changing the setting of the register. The inspection pattern is created by using a pattern generator function of the control circuit.
Japanese Patent Laid-Open No. 11-272222

  However, in Patent Document 1, it is necessary to prepare a plurality of registers and add a pattern generator function for creating a test pattern to a control circuit in order to switch and display a plurality of test patterns. There was a problem that the configuration was complicated.

  By the way, in recent electronic devices, by making a plurality of functional blocks into one chip IC, the size of parts is reduced and the manufacturing cost is reduced. Therefore, in a liquid crystal television, a video processor to which an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a timing controller for controlling a liquid crystal driving unit of the liquid crystal panel are integrated into a single chip IC, thereby reducing the size. To reduce the price and price.

  On the other hand, when a plurality of functional blocks from a video processor to which an analog data signal is input to a timing controller for controlling the driving unit of the liquid crystal panel are integrated into a single chip, digital data signals can be directly input to the timing controller. Can not.

  Therefore, for example, when an inspection pattern for flicker adjustment (flicker adjustment pattern) is displayed on a liquid crystal panel in an inspection process performed at the last step of the manufacturing process of a liquid crystal television, conventionally, a dedicated inspection apparatus is externally provided. Connected and sent the flicker adjustment pattern created digitally to the timing controller and displayed it on the liquid crystal panel for adjustment. However, it is impossible to make adjustments using such an inspection device. was there.

  In this case, when a single-chip IC is formed as described above, a flicker adjustment pattern may be created internally using an analog data signal input to the video processor. Since the waveform is distorted, it is impossible to create a sharp pattern in which white and black are inverted for each sub-pixel. Therefore, it is necessary to create and display a flicker adjustment pattern within one chip IC without using such an analog data input signal.

  On the other hand, as a driving method of the liquid crystal panel, there are two types of driving methods, a 1 × 1 driving method in which the polarity is inverted for each horizontal scanning line and a 1 × 2 driving method in which the polarity is inverted for every two horizontal scanning lines. Is something.

  FIG. 2 shows a driving signal waveform of the liquid crystal panel in the 1 × 1 driving method, and FIG. 3 shows a driving signal waveform of the liquid crystal panel in the 1 × 2 driving method. 2 and 3, “YDIO” is a start pulse in the vertical direction (Y direction) of the liquid crystal panel screen, “YCLK” is a clock pulse in the Y direction, and “XDIO” is a horizontal direction (X direction) of the liquid crystal panel screen. ) Start pulse, “XCLK” is a clock pulse in the X direction, “DATA” is display data, “XSTB” is a latch pulse in the X direction, and “XPOL” is a polarity switching signal. The difference between FIG. 2 and FIG. 3 is that the polarity switching signal “XPOL” in FIG. 2 switches every horizontal scanning period (1H), whereas the polarity switching signal “XPOL” in FIG. It is a point that switches every scanning period (2H).

  FIG. 4A shows a flicker adjustment pattern (however, only one part is enlarged) corresponding to the 1 × 1 driving method shown in FIG. 2, and FIG. Indicates a flicker adjustment pattern (however, only one portion is enlarged) corresponding to the 1 × 2 driving method shown in FIG.

  In addition to this, various driving methods such as a 1 × 3 driving method are possible as the driving method of the liquid crystal panel. Therefore, the driving method of the liquid crystal panel differs depending on each manufacturer, and even the same manufacturer may differ depending on each model.

  In this case, it is necessary to use a flicker adjustment pattern that matches the driving method of the liquid crystal panel. For example, in order to adjust the flicker of the liquid crystal panel of the 1 × 1 driving method, the flicker adjusting pattern corresponds to the 1 × 2 driving method. If the flicker adjustment pattern is used, accurate flicker adjustment cannot be performed. In other words, when each functional block of the video system of the liquid crystal television is made into a one-chip IC, it is sufficient that the flicker adjustment pattern created therein can only create a pattern that matches the driving method of the mounted liquid crystal television. However, in this case, this one-chip IC cannot be used for, for example, a 1 × 2 drive type liquid crystal television. In other words, although the cost is reduced by making a one-chip IC, it cannot be used if the driving method of the liquid crystal television is different, and the cost reduction effect is diminished. That is, it is necessary to manufacture a one-chip IC for each driving method.

  Therefore, considering the cost reduction effect, it is necessary to consider not only that each functional block of the video system is made into one chip IC, but also that this one chip IC can be commonly used for various liquid crystal televisions having different driving methods. It becomes. Also, even if it can be used in common, if the internal configuration of a single-chip IC is not complicated as much as possible and can be realized by using existing functions, the merit of using a single-chip IC is very large. Become.

  The present invention has been made in view of such a situation, and an object of the present invention is to control at least a video processor to which an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a liquid crystal driving unit of a liquid crystal panel. An object of the present invention is to provide a liquid crystal television in which the controller is integrated into a one-chip IC, and the one-chip IC can be used in common for various liquid crystal panels having different driving methods without complicating the internal configuration.

  In order to solve the above-described problems, a liquid crystal television of the present invention includes a video processor to which an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a timing controller for controlling a liquid crystal driving unit of the liquid crystal panel. An IC liquid crystal television has a memory unit that stores a plurality of inspection pattern data. During the inspection process, the CPU responds to this setting value by the setting value of the liquid crystal driving register of the timing controller. The inspection pattern data obtained is acquired from the memory unit, an inspection pattern is created by the OSD circuit, and is displayed on the liquid crystal panel.

  Here, the inspection pattern data is flicker adjustment pattern data. Specifically, the memory unit includes flicker adjustment pattern data corresponding to a 1 × 1 driving method in which the polarity is inverted for each horizontal scanning line, and 1 × 2 driving in which the polarity is inverted for every two horizontal scanning lines. Two types of pattern data of flicker adjustment pattern data corresponding to the method are stored.

  According to the liquid crystal television having such a configuration, a flicker adjustment pattern corresponding to various driving methods of the liquid crystal panel can be created and displayed within the one-chip IC. Even when the driving method of the liquid crystal panel is changed after mounting, an optimal flicker adjustment pattern corresponding to this change can be displayed during flicker adjustment.

  In this case, in the present invention, the conventional liquid crystal driving register for adjusting various functions of the video system is also used as the liquid crystal driving register for selecting the flicker adjustment pattern stored in the memory unit. ing. As a result, the internal configuration of the one-chip IC can be simplified without preparing a new register. Further, an external EEPROM can be used as the memory unit, but this memory unit may naturally be provided inside a one-chip IC.

  According to the liquid crystal television of the present invention, a video processor to which an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a timing controller for controlling a liquid crystal driving unit of the liquid crystal panel are made into one chip IC, A plurality of flicker adjustment patterns corresponding to various driving methods of the liquid crystal panel are stored in advance in this one-chip IC, and the setting value is changed by using the liquid crystal driving register originally provided in the timing controller. Such flicker adjustment pattern data is selected, and a flicker adjustment pattern is created and displayed using an OSD circuit. That is, the flicker adjustment pattern corresponding to various driving methods of the liquid crystal panel can be created and displayed in the inside of this one-chip IC, so that the driving method of the liquid crystal panel after mounting this one-chip IC. Even when the change is made, the optimum flicker adjustment pattern corresponding to the change can be displayed during the flicker adjustment. Further, since this one-chip IC can be commonly used for various liquid crystal televisions having different driving systems, the manufacturing cost of the liquid crystal television itself can be reduced. In addition, since the optimal flicker adjustment pattern that matches the LCD drive method can be displayed during flicker adjustment, it is possible to reliably prevent the occurrence of situations such as adjusting the flicker of the screen using the wrong flicker adjustment pattern. can do. In addition, since the one-chip IC itself is configured to select an optimal flicker adjustment pattern by using the liquid crystal driving register originally provided in the timing controller, the cost is reduced without complicating the internal circuit configuration. In addition, it can be manufactured at low cost, and as a result, a liquid crystal television equipped with the same can be provided to the user at low cost.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a functional block diagram showing a configuration of a main part of the liquid crystal television according to the present embodiment.

  This liquid crystal television is roughly composed of a one-chip IC 10 and a liquid crystal panel (LCD panel) module 20.

  The liquid crystal panel module 20 includes a liquid crystal panel 21 in which a TFT for driving a liquid crystal cell is formed at each intersection of a plurality of source lines to which data is supplied and a plurality of gate lines to which a scan signal is supplied. It comprises a source driver 22 for supplying data to the line and a gate driver 23 for supplying a scan signal (pulse) to the gate line.

  Further, the one-chip IC 10 includes a video processor 11 to which an analog data signal is input, an IP conversion circuit (scanning line conversion function unit) 12 that converts the input interlaced video signal to a progressive format, and a progressive video to a panel. It comprises a scaler 13 for adapting to the resolution, a panel processor 14, an OSD circuit 15, a CPU 16, and a timing controller 17 for supplying control signals to the source driver 22 and the gate driver 23, respectively.

  In addition, this one-chip IC 10 is provided with an EEPROM as an external memory unit 18 in the present embodiment, and this EEPROM 18 corresponds to a 1 × 1 driving method in which the polarity is inverted for each horizontal scanning line. Two types of pattern data are stored: flicker adjustment pattern data and flicker adjustment pattern data corresponding to the 1 × 2 driving method in which the polarity is inverted every two horizontal scanning lines.

  The timing controller 17 is provided with a liquid crystal driving register 17a. The liquid crystal drive register 17a is used for various drive system settings such as a display data output inversion function and a CLK delay setting scan direction control.

  In the present embodiment, the liquid crystal drive register 17 a is also used as a register for selecting one of the two types of flicker adjustment pattern data stored in the EEPROM 18. Thus, the internal configuration of the one-chip IC 10 can be simplified without preparing a new register.

  Next, a specific example in which the optimal flicker adjustment pattern is displayed on the liquid crystal panel 21 using the one-chip IC 10 having the above configuration will be described.

  For example, when the liquid crystal television is set to the flicker adjustment mode in the inspection process which is the last step in the manufacturing factory of the liquid crystal television, the CPU 16 sets “1” or “1” in the liquid crystal driving register 17 a provided in the timing controller 17. Any value of “0” is set. This setting is set to a predetermined value by an internal control signal when the liquid crystal television is set to the flicker adjustment mode.

  For example, when “1” is set in the liquid crystal driving register 17 a, the CPU 16 acquires, for example, 1 × 1 driving method flicker adjustment pattern data corresponding to the set value from the EEPROM 18, and the OSD circuit 15 performs 1 × 1 driving. A flicker adjustment pattern (see FIG. 4A) is created and displayed on the liquid crystal panel 21.

  On the other hand, when “0” is set in the liquid crystal drive register 17a, the CPU 16 acquires, for example, 1 × 2 drive type flicker adjustment pattern data corresponding to the set value from the EEPROM 18, and the OSD circuit 15 drives the 1 × 2 drive. A flicker adjustment pattern (see FIG. 4B) is created and displayed on the liquid crystal panel 21.

  In other words, in the flicker adjustment mode, by predetermining to set “1” in the liquid crystal driving register 17a, it is possible to cope with a 1 × 1 driving type liquid crystal television and to set “0” in the liquid crystal driving register 17a. By setting in advance so as to set “1”, it is possible to deal with a liquid crystal television of a 1 × 2 drive system. As a result, the same one-chip IC 10 can be commonly used for two types of liquid crystal televisions having different liquid crystal panel driving methods.

  In the above embodiment, the flicker adjustment pattern is described as two types of flicker adjustment patterns corresponding to the 1 × 1 driving method and flicker adjustment patterns corresponding to the 1 × 2 driving method. If the flicker adjustment patterns corresponding to the various driving methods of the liquid crystal television provided in the above are stored in the EEPROM 18, all the liquid crystal televisions can be handled. In this case, when there are three or more types of flicker adjustment patterns, two or more liquid crystal driving registers 17a may be prepared correspondingly.

  In the above embodiment, an EEPROM is used as the external memory unit 18, but the present invention is not limited to the EEPROM. Further, the memory unit 18 does not necessarily need to be externally attached, and may be included in the one-chip IC 10 as indicated by a broken line in FIG.

It is a functional block diagram which shows the structure of the principal part of this invention liquid crystal television. It is a timing chart which shows the drive signal waveform of a liquid crystal panel at the time of a 1x1 drive system. It is a timing chart which shows the drive signal waveform of a liquid crystal panel at the time of a 1x2 drive system. FIG. 4A is a schematic diagram showing a part of a flicker adjustment pattern corresponding to the 1 × 1 driving method shown in FIG. 2, and FIG. 4B corresponds to the 1 × 2 driving method shown in FIG. It is a schematic diagram showing a part of the flicker adjustment pattern.

Explanation of symbols

10 1 chip IC
11 Video Processor 12 IP Conversion Circuit (Scanning Line Conversion Function Unit)
13 Scaler 14 Panel Processor 15 OSD Circuit 16 CPU
17 Timing controller 18 Memory part (EEPROM)
20 Liquid crystal panel module 21 Liquid crystal panel 22 Source driver 23 Gate driver

Claims (5)

In a liquid crystal television in which a video processor to which an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a timing controller for controlling a liquid crystal driving unit of a liquid crystal panel are integrated into a single chip,
Two types of flicker adjustment pattern data corresponding to the 1 × 1 driving method for inverting the polarity for each horizontal scanning line and flicker adjustment pattern data corresponding to the 1 × 2 driving method for inverting the polarity for each two horizontal scanning lines The memory unit that stores the pattern data of
During the inspection process, the CPU sets this value by setting either 1 or 0 to one liquid crystal driving register for adjusting various video functions provided in the timing controller. A liquid crystal television, wherein flicker adjustment pattern data corresponding to a value is acquired from the memory unit, and a flicker adjustment pattern is created by the OSD circuit and displayed on the liquid crystal panel. In a liquid crystal television in which a video processor to which an analog data signal is input, a panel processor, an OSD circuit, a CPU, and a timing controller for controlling a liquid crystal driving unit of a liquid crystal panel are integrated into a single chip,
It has a memory unit that stores a plurality of flicker adjustment pattern data corresponding to various driving methods for liquid crystal televisions .
During the inspection process, the CPU acquires flicker adjustment pattern data corresponding to the set value from the memory unit according to the set value of the liquid crystal drive register of the timing controller, and creates the flicker adjustment pattern by the OSD circuit. And displaying on the liquid crystal panel.   The memory unit includes flicker adjustment pattern data corresponding to a 1 × 1 driving method in which the polarity is inverted every horizontal scanning line, and flicker corresponding to a 1 × 2 driving method in which the polarity is inverted every two horizontal scanning lines. The liquid crystal television according to claim 2, wherein two types of pattern data of adjustment pattern data are stored.   The liquid crystal driving register for selecting a flicker adjustment pattern stored in the memory unit is also used as a conventional liquid crystal driving register for adjusting various functions of a video system. The liquid crystal television set according to claim 2 or 3.   5. The liquid crystal television according to claim 2, wherein the memory unit is an external EEPROM.