KR102113625B1 - Setting system for driving voltage of liquid crystal display device and method for setting the same - Google Patents

Abstract

The present invention detects the light transmittance of the liquid crystal panels individually and sets the driving voltage level of the liquid crystal display according to the highest detected light transmittance, so that the liquid crystal display can further improve the individual luminance performance and image quality of the liquid crystal displays. A system for setting a driving voltage of a device, which relates to a setting method thereof, comprising: a seating portion on which a liquid crystal panel or a liquid crystal display device on which the liquid crystal panel is assembled is seated; A panel driving control unit that drives the liquid crystal panel to display the brightest luminance of the highest gradation, and also drives a separately provided backlight or a backlight unit of the liquid crystal display to irradiate light to the rear surface of the liquid crystal panel; A light detector for detecting the light transmittance of the liquid crystal panel and outputting the highest transmittance; And a driving voltage setting unit that detects a driving voltage level corresponding to the highest transmittance of the liquid crystal panel and sets and stores a code of the driving voltage level in the data integrated circuit of the liquid crystal panel.

Description

The driving voltage setting system of a liquid crystal display device and its setting method {SETTING SYSTEM FOR DRIVING VOLTAGE OF LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR SETTING THE SAME}

The present invention detects the light transmittance of the liquid crystal panels individually and sets the driving voltage level of the liquid crystal display according to the highest detected light transmittance, so that the liquid crystal display can further improve the individual luminance performance and image quality of the liquid crystal displays. It relates to a driving voltage setting system and a setting method of the device.

Recently, a lightweight and thin flat panel display is mainly used as a video display device used in a personal computer, a portable terminal, and a monitor of various information devices. In particular, among the flat panel display devices, the liquid crystal display device is excellent in resolution, color display, and image quality, and is actively applied to a notebook or desktop monitor.

When manufacturing a liquid crystal display device, the liquid crystal panel is discriminated through a lighting inspection process before entering a module assembly process assembled with a separate driving circuit part or a power supply part, or after the module assembly process is performed. In such a defect inspection, the driving of each liquid crystal panel and the presence or absence of defects in pixels are determined using an inspection device such as an auto-probe apparatus.

When inspecting a liquid crystal panel using an auto probe device or the like, a preset driving circuit or a backlight unit is connected to the completed liquid crystal panel, and the liquid crystal panel is driven for a predetermined time to determine whether each liquid crystal panel is defective. Then, when it is determined that there is no abnormality as a result of the inspection, the control signal generation code and the driving voltage level setting code are input and stored in the driving integrated circuits driving the liquid crystal display device. In this process, after inspecting the liquid crystal panel, a control signal generation code and a driving voltage level code are set in the driving integrated circuits according to the average experimental value of the liquid crystal panels that have been mass-produced.

However, since each liquid crystal panel is produced through various process processes such as pixel formation, alignment film rubbing, substrate bonding, liquid crystal filling, and polarizing film bonding processes, it has various process variations, and these process variations are recognized as luminance variations of the liquid crystal panels. In particular, process deviations that occur during the alignment film rubbing process and the polarizing film bonding process affect the transmittance and luminance deviation of each liquid crystal panel. Accordingly, when the same control signal generation code and the driving voltage level code are set and stored in the driving integrated circuits in a batch, the luminance deviation with high visibility is more noticeable and reliability is deteriorated.

The present invention is to solve the above problems, by individually detecting the light transmittance of the liquid crystal panel, and by setting the driving voltage level of the liquid crystal display device according to the highest detected light transmittance, the individual luminance performance of the liquid crystal display devices And it is an object to provide a driving voltage setting system and a setting method of the liquid crystal display device to further improve the image quality.

A drive voltage setting system of a liquid crystal display device according to an exemplary embodiment of the present invention for achieving the above object includes a liquid crystal panel or a seating portion on which the liquid crystal display device on which the liquid crystal panel is assembled is mounted; A panel driving control unit that drives the liquid crystal panel to display the brightest luminance of the highest gradation, and also drives a separately provided backlight or a backlight unit of the liquid crystal display to irradiate light to the rear surface of the liquid crystal panel; A light detector for detecting the light transmittance of the liquid crystal panel and outputting the highest transmittance; And a driving voltage setting unit that detects a driving voltage level corresponding to the highest transmittance of the liquid crystal panel and sets and stores a code of the driving voltage level in the data integrated circuit of the liquid crystal panel.

The panel driving control unit gradually changes the image data, the pixel voltage level, or the gamma voltage level so that the liquid crystal panel displays the brightest luminance of the highest gradation and supplies it to the data integrated circuit, and also provides light to the rear surface of the liquid crystal panel. It is characterized in that to drive the backlight unit provided separately on the back surface of the seating portion or the backlight unit of the liquid crystal display device itself to be irradiated.

The driving voltage setting unit receives image data or pixel voltage level or gamma voltage level information supplied to the liquid crystal panel gradually by the panel driving control unit, and receives the highest transmittance value of the liquid crystal panel from the light detection unit. Pixel voltage level or gamma voltage level information corresponding to the highest transmittance of the liquid crystal panel is compared to detect the pixel voltage level of the highest gradation corresponding to the highest transmittance, and the data integrated circuit of the liquid crystal panel is set to the highest transmittance of the liquid crystal panel. It is characterized by setting and storing pixel voltage and gamma voltage level codes of corresponding highest gradations.

The panel driving control unit, the light detection unit, and the driving voltage setting unit are integrally formed with an auto-probe apparatus or a separate inspection device for inspecting the presence or absence of defects in the liquid crystal panel, thereby determining whether or not the liquid crystal panels are defective. It is characterized by detecting the highest transmittance at the same time as the inspection, and setting and storing the pixel voltage and gamma voltage level codes of the highest gradation corresponding to the highest transmittance.

The seating portion, the panel driving control portion. The light detection unit and the driving voltage setting unit are separately provided in a manufacturing process line or a quality determination line in which the liquid crystal panel is manufactured, and simultaneously inspects for the presence or absence of defects in the liquid crystal panels, detects the highest transmittance, and corresponds to the highest transmittance. It is characterized by setting and storing the pixel voltage and gamma voltage level codes of the highest gradation.

In addition, a method for setting a driving voltage of a liquid crystal display device according to an exemplary embodiment of the present invention for achieving the above object comprises the steps of: seating a liquid crystal panel or a liquid crystal display device on which the liquid crystal panel is assembled; A step in which the liquid crystal panel displays the brightest luminance of the highest gradation according to the driving of the panel driving control unit, and a separately provided backlight or a backlight unit of the liquid crystal display unit irradiates light to the rear surface of the liquid crystal panel; Outputting the highest transmittance by detecting the light transmittance of the liquid crystal panel through a light detector; And detecting a driving voltage level corresponding to the highest transmittance of the liquid crystal panel through the driving voltage setting unit, and setting and storing a code of the driving voltage level in the data integrated circuit of the liquid crystal panel.

The step of irradiating light to the rear surface of the liquid crystal panel may include gradually supplying the image data, pixel voltage level, or gamma voltage level to the data integrated circuit so that the liquid crystal panel displays the highest gradation luminance. And driving a backlight provided separately on the rear surface of the seating portion or a backlight unit of the liquid crystal display device itself so that light is irradiated to the rear surface of the liquid crystal panel.

The setting and storing of the driving voltage level code includes receiving image data, pixel voltage level, or gamma voltage level information supplied to the liquid crystal panel by gradually varying from the panel driving control unit, and the highest transmittance value of the liquid crystal panel from the light detector. Receiving, comparing the pixel voltage level or gamma voltage level information corresponding to the highest transmittance value of the liquid crystal panel to detect the pixel voltage level of the highest gray level corresponding to the highest transmittance value, and the data integrated circuit of the liquid crystal panel. And setting and storing the pixel voltage and gamma voltage level codes of the highest gradation corresponding to the highest transmittance of the liquid crystal panel.

The panel driving control unit, the light detection unit, and the driving voltage setting unit are integrally formed with an auto-probe apparatus or a separate inspection device for inspecting the presence or absence of defects in the liquid crystal panel, thereby determining whether or not the liquid crystal panels are defective. It is characterized by detecting the highest transmittance at the same time as the inspection, and setting and storing the pixel voltage and gamma voltage level codes of the highest gradation corresponding to the highest transmittance.

The seating portion, the panel driving control portion. The light detection unit and the driving voltage setting unit are separately provided in a manufacturing process line or a quality determination line in which the liquid crystal panel is manufactured, and simultaneously inspects for the presence or absence of defects in the liquid crystal panels, detects the highest transmittance, and corresponds to the highest transmittance. It is characterized by setting and storing the pixel voltage and gamma voltage level codes of the highest gradation.

A driving voltage setting system and a setting method of a liquid crystal display device according to an embodiment of the present invention having various technical characteristics as described above individually detect light transmittance of the liquid crystal panels, and the corresponding liquid crystal display device according to the highest detected light transmittance The driving voltage level of can be set. Accordingly, individual luminance performance and image quality of each commercialized liquid crystal display device can be improved, but reliability can be further improved.

1 is a configuration diagram showing a drive voltage setting system of a liquid crystal display according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a drive voltage setting system of the liquid crystal display of FIG. 1.
3 is a graph showing the results of detecting light transmittance of a plurality of liquid crystal panels detected through the light detectors of FIGS. 1 and 2.

Hereinafter, a driving voltage setting system and a setting method of the liquid crystal display device according to an exemplary embodiment of the present invention having the above characteristics will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram showing a driving voltage setting system of a liquid crystal display according to an exemplary embodiment of the present invention. And, FIG. 2 is a circuit diagram showing a drive voltage setting system of the liquid crystal display of FIG. 1.

1 and 2, the driving voltage setting system of the liquid crystal display device includes: a liquid crystal panel 2 or a seating portion 30 on which the liquid crystal panel 2 is assembled; The liquid crystal panel 2 is driven to display the brightest luminance of high gradation, and a separately provided backlight 25 or a backlight unit of the liquid crystal display device is driven so that light is irradiated to the rear surface of the liquid crystal panel 2. A panel drive control section 8; A light detector 20 for detecting the light transmittance of the liquid crystal panel 2 and outputting the highest transmittance CS; A driving voltage setting unit 10 for detecting a driving voltage level corresponding to the highest transmittance CS of the liquid crystal panel 2 and setting and storing a code of the driving voltage level in the data integrated circuit 3 of the liquid crystal panel do.

The driving voltage setting system of the liquid crystal display configured as described above is separately provided in the manufacturing process line or the quality determination line of the liquid crystal panel to detect the highest transmittance (CS) of each of the mass-produced liquid crystal panels and detect the highest transmittance (CS). The code of the driving voltage level corresponding to may be set and stored in the data integrated circuit driving the corresponding liquid crystal panel.

On the other hand, the driving voltage setting system of the liquid crystal display device is integrally formed with an inspection device such as an auto probe device (Auto-Probe Apparatus) for inspecting the presence or absence of defects in mass-produced liquid crystal panels. The highest transmittance value may be detected, and a code of a driving voltage level corresponding to the highest transmittance value CS may be set and stored in the driving integrated circuit driving the corresponding liquid crystal panel.

Each mass-produced liquid crystal panel 2 includes a thin film transistor (TFT), TFT formed in each pixel region defined by a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm. And a connected liquid crystal capacitor (Clc). The liquid crystal capacitor Clc is composed of a pixel electrode connected to a TFT, and a common electrode formed between the pixel electrode and the liquid crystal. The TFT supplies an image signal from each of the data lines DL1 to DLm to the pixel electrode in response to the scan pulses from each of the gate lines GL1 to GLn. The liquid crystal capacitor Clc implements gradation by charging the difference voltage between the image signal supplied to the pixel electrode and the reference common voltage supplied to the common electrode, and adjusting the light transmittance by varying the arrangement of the liquid crystal molecules according to the difference voltage. . In addition, the storage capacitor Cst is connected to the liquid crystal capacitor Clc in parallel so that the voltage charged in the liquid crystal capacitor Clc is maintained until the next data signal is supplied.

A circuit film on which at least one driving integrated circuit is mounted is attached to the liquid crystal panel 2, or at least one driving integrated circuit may be directly mounted on a non-display area of the liquid crystal panel 2 and configured. Here, the driving integrated circuit includes a data integrated circuit 3 driving the data lines DL1 to DLm of the liquid crystal panel 2 and a gate integrated circuit driving the gate lines GL1 to GLn of the liquid crystal panel 2 ( 4), and may be an integrated driving integrated circuit driving both gate and data lines. Hereinafter, only the data integrated circuit 3 driving the data lines DL1 to DLm of the liquid crystal panel 2 will be described as an example.

Each of the mass-produced liquid crystal panels 2 are sequentially seated and fixed to the seat 30. The seating portion 30 is provided in the form of a transparent flat plate, so that light from the backlight 25 located on the rear surface is applied to the rear surface of the liquid crystal panel 2. At least one data integrated circuit 3 may be mounted and attached to the liquid crystal panel 2 seated on the seating portion 30, and when not attached, the data integrated circuit to be attached to the liquid crystal panel 2 (3) is classified and stored separately.

The panel driving control unit 8 supplies driving control signals to the respective gates and data integrated circuits 4 and 3 of the liquid crystal panel 2 through a shorting bar type auto probe block 15 or a tap block, and thus the corresponding liquid crystal. The panel 2 is driven to gradually display the brightest luminance of high gradation. In other words, the panel driving control unit 8 gradually changes the image data (or the pixel voltage level or gamma voltage level) so that the liquid crystal panel 2 gradually displays the brightest luminance of high gradation. ) And data control signals. The gate control signal is supplied to the gate integrated circuit 4 so that the gate-on signals are simultaneously supplied to all the gate lines GL1 to GLn.

At the same time, the panel driving control unit 8 drives the backlight 25 separately provided on the rear surface of the seating portion 30 or the backlight unit of the liquid crystal display itself so that light is irradiated to the rear surface of the liquid crystal panel 2. do. Accordingly, the liquid crystal panel 2 displays the brightest high gradation luminance.

The light detector 20 is arranged to maintain a predetermined distance in the peripheral portion of the liquid crystal panel 2 or in front of the liquid crystal panel 2, and continuously detects light transmittance of the liquid crystal panel 2 that is gradually changing in real time. The light detector 20 includes at least one illuminance sensor or an optical sensor to continuously detect a change in light transmittance of the liquid crystal panel 2, thereby detecting a maximum transmittance CS of the liquid crystal panel 2 and Output.

The driving voltage setting unit 10 receives image data, pixel voltage level, or gamma voltage level information supplied by being gradually varied from the panel driving control unit 8 to the liquid crystal panel 2, and is applied from the light detection unit 20. The highest transmittance CS of the liquid crystal panels 2 is supplied. Then, the pixel voltage level or gamma voltage level information corresponding to the highest transmittance CS of the liquid crystal panel 2 is compared to detect the pixel voltage level of the highest gradation corresponding to the highest transmittance CS. Subsequently, the driving voltage setting unit 10 applies the pixel voltage and gamma voltage level codes of the highest gradation to the data transmissive circuit 3 of each liquid crystal panel 2 corresponding to the highest transmittance CS of each liquid crystal panel 2. Set and save.

The pixel voltage level of the highest gray level may be a reference gamma voltage level or a gamma voltage level of the highest gray level. Accordingly, when the pixel voltage or gamma voltage of the 255 gray level, which is the highest gray level, is set to the + 4.4V level, 254 is sequentially between the gamma voltage 4.4V of the highest gray level and the gamma voltage 0V or -4.4V of the lowest gray level that is set in advance. Gamma voltage levels of gradation to 1 gradation can be set and stored. Thus, if the pixel voltage level of the highest gradation corresponding to the highest transmittance (CS) is set and applied for each liquid crystal panel 2, regardless of the inherent luminance deviation of each liquid crystal panel 2, each liquid crystal panel (2) Each maximum luminance value can be displayed at the highest gradation level.

3 is a graph showing a result of detecting light transmittance of a plurality of liquid crystal panels detected through the light detectors of FIGS. 1 and 2.

1 and 3, when each liquid crystal panel 2 receives light of the same brightness from the backlight unit and displays an image by a gradually increasing pixel voltage (Vpixel) level, the highest transmittance value It can be seen that the time at which (CS) is detected and the pixel voltage (Vpixel) level are differently detected according to the deviation of each liquid crystal panel 2 (refer to the maximum transmittances ①, ②, ③, ④, ⑤ in FIG. 3).

The transmittance and luminance deviation of each liquid crystal panel 2 receives an image according to the process deviation that occurs during the alignment film rubbing process and the polarizing film bonding process. Accordingly, if the maximum luminance level of each liquid crystal panel 2 can be accurately displayed at the highest gradation level, the inherent luminance deviation of the liquid crystal panels 2 is eliminated.

To this end, the light detector 20 detects the highest transmittance CS of each liquid crystal panel 2. Then, the driving voltage setting unit 10 is supplied with the pixel voltage level information supplied by being gradually varied from the panel driving control unit 8 to the liquid crystal panel 2, and the corresponding liquid crystal panel 2 from the light detection unit 20 The highest transmittance (CS) of them is supplied.

[Table 1]

Table 1 above shows pixel voltage level information supplied to the liquid crystal panel 2 when the transmittance of the liquid crystal panel 2 is detected, and codes of the voltage level.

The driving voltage setting unit 10 receives the pixel voltage level information supplied from the panel driving control unit 8 to the liquid crystal panel 2 and a code (Vaule) of the corresponding voltage level in advance, and the corresponding liquid crystal from the light detection unit 20. When the highest transmittance value CS of the panels 2 is supplied, the pixel voltage level information corresponding to the highest transmittance value CS of the liquid crystal panel 2 and the code of the corresponding voltage level are compared. Then, the pixel voltage level of the highest gray level corresponding to the highest transmittance value CS and the code of the corresponding level are detected.

[Table 2]

Table 2 shows the pixel voltage level of the highest gradation and the corresponding pixel voltage level code (Vaule) corresponding to the detected maximum transmittance (CS).

The driving voltage setting unit 10 transmits the highest transmittance value of each liquid crystal panel 2 to the data integrated circuit 3 of each liquid crystal panel 2 according to the detection result of the pixel voltage level of the highest gradation corresponding to the highest transmittance CS. CS) sets and stores the pixel voltage level code (Vaule) of the highest gradation.

[Table 3]

Table 3 shows the pixel voltage level of the highest gradation according to the highest transmittance and highest luminance detected for each liquid crystal panel.

As in the prior art, if the pixel voltage level code is set and stored in the driving integrated circuits according to the average experimental value of the liquid crystal panels that have been mass-produced in the past, the highest transmittance is achieved even if the pixel voltage according to the highest gradation is supplied. # 1. # 2) Because they are different, deviations may occur.

However, as set forth in the present invention, when the pixel voltage level of the highest gradation for each liquid crystal panel 2 is set according to the highest transmittance CS detected for each liquid crystal panel 2, each of the liquid crystal panels # 1. # 2 The highest transmittance can always be maintained at the highest level. That is, if the pixel voltage level of the highest gradation corresponding to the highest transmittance (CS) is set and applied for each liquid crystal panel 2, regardless of the inherent luminance deviation of each liquid crystal panel 2, the maximum luminance, respectively The value can be displayed at the highest gradation level. Accordingly, individual luminance performance and image quality of each commercialized liquid crystal display device can be improved, but reliability can be further improved.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of

2: LCD panel 3: Data integrated circuit
4: gate integrated circuit 8: panel drive control
10: drive voltage setting section 15: auto pro section block
20: light detector 30: seating
50: driving voltage setting system

Claims (10)

A mounting portion on which a liquid crystal panel or a liquid crystal display device on which the liquid crystal panel is assembled is seated;
The driving voltage level is gradually changed so that the light transmittance of the liquid crystal panel is variable to drive the liquid crystal panel, and a separately provided backlight or a backlight unit of the liquid crystal display device is driven to transmit light to the rear surface of the liquid crystal panel. A panel driving control unit to be irradiated;
A light detector for detecting the light transmittance of the liquid crystal panel and outputting the highest transmittance; And
And a driving voltage setting unit configured to detect the driving voltage level corresponding to the highest transmittance of the liquid crystal panel and set and store a code of the driving voltage level in the data integrated circuit of the liquid crystal panel. According to claim 1,
The driving voltage level
A driving voltage setting system for a liquid crystal display device including image data, pixel voltage level, or gamma voltage level. According to claim 2,
The driving voltage setting unit
Receiving the image data, the pixel voltage level, or the gamma voltage level information supplied by being gradually varied and supplied to the liquid crystal panel from the panel driving control unit,
The highest transmittance of the liquid crystal panel is supplied from the light detector,
Comparing the pixel voltage level or the gamma voltage level information corresponding to the highest transmittance of the liquid crystal panel to detect the pixel voltage level or the gamma voltage level of the highest gray level corresponding to the highest transmittance,
A driving voltage setting system for a liquid crystal display device that sets and stores the pixel voltage or the gamma voltage level code of the highest gray level corresponding to the highest transmittance of the liquid crystal panel in the data integrated circuit of the liquid crystal panel. The method of claim 3,
The panel driving control unit, the light detection unit and the driving voltage setting unit are integrally formed with an auto-probe apparatus or a separate inspection device for inspecting whether the liquid crystal panel is defective,
A driving voltage setting system for a liquid crystal display device that detects the presence or absence of defects in the liquid crystal panels and detects the highest transmittance and sets and stores the pixel voltage or the gamma voltage level code of the highest gradation corresponding to the highest transmittance. The method of claim 3,
The seating portion, the panel driving control portion. The light detection unit and the driving voltage setting unit are separately provided in a manufacturing process line or a quality determination line in which the liquid crystal panel is manufactured,
A driving voltage setting system for a liquid crystal display device that detects the presence or absence of defects in the liquid crystal panels and detects the highest transmittance and sets and stores the pixel voltage or the gamma voltage level code of the highest gradation corresponding to the highest transmittance. A step in which a liquid crystal panel or a liquid crystal display in which the liquid crystal panel is assembled is seated on a seating portion;
In addition to driving the liquid crystal panel by gradually varying the driving voltage level so that the light transmittance of the liquid crystal panel is variable, a separately provided backlight or a backlight unit of the liquid crystal display irradiates light to the rear surface of the liquid crystal panel. To do;
Detecting the light transmittance of the liquid crystal panel and outputting the highest transmittance; And
And detecting a driving voltage level corresponding to the highest transmittance of the liquid crystal panel and setting and storing a code of the driving voltage level in the data integrated circuit of the liquid crystal panel. The method of claim 6,
The driving voltage level includes a video data, a pixel voltage level, or a gamma voltage level. The method of claim 7,
The driving voltage level code setting and storage step
Receiving the image data, the pixel voltage level, or the gamma voltage level information supplied by being gradually varied and supplied to the liquid crystal panel,
Receiving the highest transmittance of the liquid crystal panel,
Comparing the pixel voltage level or the gamma voltage level information corresponding to the highest transmittance value of the liquid crystal panel and detecting a pixel voltage level or a gamma voltage level of the highest gray level corresponding to the highest transmittance level; and
And setting and storing the pixel voltage or the gamma voltage level code of the highest gradation in the data integrated circuit of the liquid crystal panel. delete delete

Images