JP2793518B2 - Display inspection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device inspection apparatus.

[0002]

2. Description of the Related Art Conventionally, in a device having a liquid crystal screen or the like, a display system such as a liquid crystal screen is inspected by the following method. First, it includes pre entire screen to perform display (reversing the entire screen) means device to be tested. Then, when the inspection is carried out, the means for displaying on the entire screen already installed is operated to display on the entire screen. Therefore, a failure of the display function, that is, a lack of display or an abnormality of display density is determined by visually observing the entire screen or by using a special inspection device or the like prepared for inspection of a display function such as a liquid crystal screen. then the bar code signal voltage is applied to the liquid crystal, as the technique for reading this bar code sensor, Han the surface of the liquid crystal display device of the arm watch-type
There is to be swept by de scanner bar code sensor. In this case, the backlight is not, because will detect the reflection pattern of the liquid crystal display against sunlight or room light, the bar code sensor, for detecting the light-emitting diode and reflected light for illuminating the liquid crystal display A pencil-type barcode sensor having a photodiode is used. Since the light from the light emitting diode impinges obliquely on the liquid crystal display, it should not be preferable for the measurement of the liquid crystal light passing / blocking characteristics, but it seems that there is no problem with the detection of the bar code pattern which is an aggregate of pixels. It is.

A technique for displaying a plurality of different bar code patterns on a liquid crystal display so as to be visually perceived and selecting one of them to read by a bar code sensor is disclosed in JP-A-60-3784. there is an electronic record Soo data as described. The liquid crystal display includes apples, oranges,
・ ・ ・ ・ ・ ・ Characters like this and the corresponding barcode are displayed as a pair. For example, when oranges are purchased, the display barcode corresponding to oranges is a pencil-type barcode sensor. It is described that when a sweep is performed by a (hand scanner), this is converted into a product price and output to a printing unit or the like. Unlike electronic watches, electronic registers have no restrictions on power consumption, so illuminating the entire liquid crystal display from behind using a backlight makes it easier to see the bar code, and if there is only a photodiode as a sensor Although good (light emitting diode is unnecessary), this point is not mentioned.

The required inspection items of the liquid crystal display include light passing and blocking characteristics of each pixel and its temporal variation (flicker).
This is positional information of a defective pixel. The above-described inspection may be required for each pixel of B. Japanese Patent Application Laid-Open No. 1-270099 discloses a technique for automatically inspecting a liquid crystal display for uneven brightness and flicker using only one photodiode. This adopts a dictionaryless inspection, and uses an average gray level for the entire liquid crystal display as an inspection standard.

Japanese Patent Application Laid-Open No. 4-44493 discloses a CCD.
Automatic inspection technique using a mosquito-flops La is shown. This adopts a dictionary inspection, in which the display image of the color liquid crystal panel is divided into a plurality of picture element groups, and the picture elements included in the picture element groups are inspected for defects to thereby check the entire color liquid crystal panel.
It is one that checks for picture element defects, a lighting unit for lighting the color liquid crystal panel, the data of the standard pixel group pixels with no defects in the same pattern as the picture element groups are arranged in advance The stored memory unit calculates a luminance level difference between each picture element included in the picture element group and each picture element corresponding to the standard picture element group, and calculates the absolute value of the difference in luminance level in the memory unit. And a monitor that displays only picture elements whose absolute value is equal to or greater than a predetermined value.

[0006] Japanese Patent Application Laid-Open No. 5-322700 discloses an automatic inspection technique using a photoelectric converter such as a one-dimensional CCD camera. This adopts a dictionaryless inspection, and FIG. 2 is a schematic diagram showing the configuration. All the pixels 111, 111,... Constituting the liquid crystal panel 110 to be inspected.
Is controlled to be in a light-passing or light-blocking state, and the liquid crystal panel 110 is irradiated with parallel light from the point light source 101 via the lens 102, and the light passing through the liquid crystal panel 110 is
At 4, the signal is converted into an electric signal, and the pass / fail is judged by the judgment unit 105, and the result is displayed on the display unit 106.

A memory and a comparator are incorporated in the determination unit 105. For example, when inspecting the light transmission characteristics, the light transmission signals of all the pixels of the liquid crystal panel 110 are set to A.
After performing the / D conversion and temporarily storing the data in the memory, the stored content of the memory is read out at a certain interval, and applied to the first input terminal of the comparator through the D / A converter. A second input terminal of the comparator is used for comparison (so-called all “1”) from the signal generator 107 at the above-described timing.
A pulse signal is supplied and the two are compared. By adjusting the level of the pulse signal for comparison, it is also possible to inspect intermediate defects in each of the pixels 111, 111,... Of the liquid crystal panel 110. According to this technique, the inspection can be performed only by hardware.

[0008]

BRIEF Problems to be Solved low under the reliability of the inspection due to erroneous recognition by visual observation in the prior art method, test査者experience had led to variations in reliability due to physical condition. In addition, when a special inspection device or the like prepared for the inspection is used, deterioration of inspection efficiency due to complicated operation of the inspection device,
Inspection costs increased due to the purchase of equipment.

[0009]

SUMMARY OF THE INVENTION Inspection of a display device according to the present invention
The apparatus includes a first device for storing an inspection pattern such as a barcode.
An inspection pattern storage unit, and the inspection pattern
Display control means for displaying on a display device,
Optically read the display pattern displayed on the display device
Reading means and second inspection for storing the inspection pattern
Pattern storage means, output data of said reading means and
Comparing with the output data of the second inspection pattern storage means.
Inspection result determination means for determining a non-defective product
First inspection pattern for storing an inspection pattern such as a barcode
Storing the inspection pattern in the display device to be inspected.
Display control means for displaying, and the display device to be inspected
Reader that optically reads the display pattern displayed on
Step and a second test pattern for storing the test pattern
Storage means, output data of the reading means and the second
Compare the output data of the test pattern storage
Inspection result determination means for determining a non-defective product if they match.
Is done.

[0010]

FIG. 1 is a schematic view showing an embodiment of the present invention. In FIG. 1, the terminal A is a device to be inspected, and the terminal B is an inspection device. The terminal A includes a control unit A-1 for controlling a program and a display unit A- for displaying a barcode.
Two. Further, the control means A-1 includes a barcode display control means A-11 having a function of generating and displaying a barcode from a barcode, and a barcode data storage means A-12 having a function of storing barcode data. Is given. Further, the terminal B includes a control means B-1 for controlling a program, a barcode scanning means B-2 capable of reading a barcode, and an inspection result notifying means B- for notifying a processing result of the control means B-1. Three. Further, the control means B-1 includes a barcode decoding means B-11 having a function of decoding the read barcode and converting it into barcode data, and a barcode data storage means B-12 having a function of storing barcode data. , And bar code data, and an inspection result determining means B-13 for determining the matching result is provided.

When performing an inspection, bar code data to be used for the inspection is specified as preparation for the inspection. And terminal A
The predetermined barcode data used in the barcode data storage means A-12 and the barcode storage means B-12 of the terminal B are stored in advance. At the time of inspection, terminal A
The display control means A-11 reads the barcode data from the barcode data storage means A-12.
Next, the barcode display control means A-11 forms a barcode from the barcode data, and displays the barcode on the display means A-2.

The bar code displayed on the display means A-2 of the terminal A is read by the bar code scanning means B-3 of the terminal B, and the bar code decoding control means B-11 controls the bar code data or the display means A- If the data cannot be read normally due to lack of display of No. 2 or abnormality in shading, the inspection result determination means B-13 is notified as abnormal data.
The inspection result determination means B-13 compares the notified barcode data with the barcode data defined for the inspection stored in the barcode data storage means B-12. Is recognized as normal, and the inspection result notifying means B-3 is notified that the device to be inspected is normal. Bar code decoding control means B
-11, or a bar code notified from the bar code decoding control means B-11 and a bar code stored for inspection in the bar code data storage means B-12. The data is compared, and if they do not match, the display unit A-2 of the terminal A recognizes that there is an abnormality, and notifies the inspection result notifying unit B-3 that the device to be inspected is abnormal.

By changing the size of the bar code displayed on the terminal A, the minimum unit that can be displayed on the display means A-2 of the terminal A is determined by the minimum bar of the bar code displayed on the display means A-2. From the most precise inspection by matching the unit, the precision of the inspection can be freely adjusted.

Further, as one application example of the present invention, when performing a shipping inspection of a terminal device in which a screen capable of displaying a barcode and a computer main body are integrated, the barcode scanning means B-2 of the terminal B needs to be provided. A non-contact type fixed scanner capable of scanning a bar code from a fixed distance is used, and a device for excluding the device to be inspected from the inspection line when an abnormality occurs is added to the inspection result notifying means B-3 of the terminal B. By this. Shipment inspection on the screen of the terminal device can be performed automatically,
It is also possible to incorporate it into a shipping line, and it is possible to flexibly perform inspections for different devices to be inspected. Further, by incorporating the configuration of the terminal B into the terminal A itself, which is the device to be inspected, it is possible to perform an independent inspection.

[0015]

As described above, according to the present invention, in a device having a liquid crystal screen or the like capable of displaying a bar code, the problem of the screen, that is, the lack of the display or the shading of the display is accurately, simply and efficiently performed. It can be expected that the inspection quality can be constant and the inspection quality is not affected by the experience and physical condition of the inspector. In addition, since it is possible to use an ordinary and relatively inexpensive barcode scanning device (or a device that can be diverted for use in another business) without using a special inspection device, it is possible to perform inspection by complicated operation of the inspection device. It is possible to prevent the efficiency from deteriorating and suppress the increase in the inspection cost due to the purchase of the apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of the related art.

[Explanation of symbols]

 A terminal A-1 control means A-11 barcode display control means A-12 barcode data storage means A-2 display means B terminal B-1 control means B-11 barcode decoding control means B-12 barcode data storage Means B-13 Inspection result determination means B-2 Barcode scanning means B-3 Inspection result notification means

Claims (1)

(57) [Claims] (A) Reference barcode data used for inspection
Bar code data storage means (B-12) for storing the information, and (B) display means (A-2) of the display device (A) to be inspected.
Display figure corresponding to the reference bar code data
Bar code scanning means (B-2), and (C) solving the output signal of the bar code scanning means (B-2).
Barcode solution for reading and outputting barcode data to be inspected
Reading means (B11); (D) reference barcode data and inspected barcode data;
Is generated in the display figure of the display device under inspection (A).
And a test result determination means for determining (B-13) defect inspection device for a display device, which comprises a.