JPH069283Y2 - Display element segment position deviation detection device - Google Patents

Description

Detailed Description of the Invention A. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a segment position shift detection device for a letter-shaped display element.

B. SUMMARY OF THE INVENTION In this invention, in a segment displacement detection apparatus for a display element, information of a coordinate system that has been input as reference information in advance is compared with each segment array state output of the display element captured at the imaging position, and the comparison is made. By detecting the position shift of the segment from the result, the reading accuracy of the position shift of the segment of the display element is dramatically improved.

C. 2. Description of the Related Art For example, there is a display element having a letter-shaped 7-segment display using a fluorescent display tube, a light emitting diode, a liquid crystal or the like. The above-mentioned day-shaped 7-segment display elements are usually arranged over several digits and are often assembled in the same structure.
Since the display element has several digits, the segment array of a certain digit may be misaligned with the segment array of another digit. If such a display element is incorporated into a product, it may deteriorate the quality of the product.
Must be avoided. Therefore, it is necessary to detect the segment position shift of the display element before incorporating it into the product.

D. Problems to be Solved by the Invention In order to detect the displacement of the display element segment position, first the display element assembly structure is positioned, and then the 7-segment array is arranged from above the display element by image processing using a photographing device or the like. I was checking the condition. However, since many display element assembly structures are generally vulnerable to vibration, when a large force is applied to the assembly structure when mechanically positioning the assembly structure, it may be damaged. For this reason, the positioning of the assembly structure is performed very roughly so as not to apply a large force. As a result, when the positions of the seven segments are read by the image processing means described above, the positioning is rough, and thus there is a problem that misreading of the positional deviation easily occurs.

E. Means for Solving Problems The present invention provides an image pickup device that captures a lighting state of a display element and obtains a segment arrangement state output of the display element at an output, and a segment arrangement state output of the display element sent from the image pickup device. A positional deviation measuring unit that compares the information of the supplied coordinate system, which is a reference coordinate system, and the segment array status output, and measures the positional deviation with the information of the coordinate system, and the positional deviation measuring unit measures the positional deviation. And a recognition unit for recognizing the generated positional deviation output.

F. Action The display driver is turned on by the display driver. The illuminated display element is photographed by an imaging device including an image sensor and an image input unit. In the image pickup device, the segment arrangement state of the display elements is subjected to image processing and output. The image output in the segment arrangement state is compared with the information of the coordinate system input to the position shift measuring unit to measure the position shift. The displacement output is recognized by the recognition unit.

G. Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a letter-shaped 7-segment display element assembly structure, and this assembly structure 1 is controlled by a display driver 2. An image sensor 3 is provided above the assembly structure 1.
The image sensor 3 is for photographing the segment arrangement state of the assembly structure and converting it into an electric signal. The output signal of the image sensor 3 is input to the image input unit 4, and then to the binarization processing unit 5 that determines whether or not the segment is lit. 2 in the binarization processing unit 5
The digitized segment array status signal is used for the position shift measuring unit 6
Entered in. Information on the coordinate system, which serves as reference information, is input to the displacement measuring unit 6 in advance. The positional deviation measured by the positional deviation measuring unit 6 is recognized by the recognition unit 7.

Next, the operation of the above embodiment will be described.

The display element assembly structure 1 is turned on by the display driver 2. This lighting state is photographed by the image sensor 3 and the electric signal thereof is input to the image input unit 4. The output signal of the image input unit 4 is binarized by the binarization processing unit 5 and input to the position shift measuring unit 6. Since information on the reference coordinate system is input to the positional deviation measuring unit 6, means for measuring positional deviation of the segment using this information will be described below.

In Fig. 2, line segments "a", "b", "c", and "d"
Is the information of the reference coordinate system, and the point where the line segment “a” and the segment intersect is A. Similarly, the point where the line segment "b" intersects the segment is B, the point where the line segment "c" intersects the segment is C, and the point where the line segment "d" intersects the segment is D. Next, when the line Y connecting the intersection points A and B is extended to the right in the figure and the line Z connecting the intersection points C and D is extended upward in the figure, the point where the two lines Y and Z intersect is determined. Let P. If this intersection point P is compared with a reference point O that has been input as coordinate system information in advance (the reference point O is at the same position as the intersection point P since there is no positional deviation in this FIG. 2), the segment Positional deviation can be measured immediately. Further, the inclination angle θ of the segment can be measured by measuring the inclination angle θ between the line Y and a horizontal line (not shown) (input as coordinate system information).

The positional deviation measured by the positional deviation measuring unit 6 is recognized by the recognizing unit 7 and the display element assembly structure 1 is determined to be defective.

FIG. 3 is an explanatory diagram showing a case where the first digit segment is extremely deviated, and when the segment is deviated as shown in FIG. 3, the intersection point P and the reference point O of the coordinate system information are described above. Is compared.

FIG. 4 is a diagram showing a segment arrangement of a display element assembly structure in which the date-shaped segments are vertically formed.
In the case of the figure, since the segments are vertical, the line segments may be “a”, “b”, and “c” as shown.

In the above-mentioned embodiment, the case of measuring the position shift of the segment in the 4-digit display element assembly structure has been described. However, in the case of 8-digit or 10-digit, only one reference point is required. This facilitates teaching and saves labor.

H. Effect of the Invention As described above, according to the present invention, the information of the reference coordinate system is compared with the segment array state output obtained by photographing in advance, so that the accuracy of reading the positional deviation is further improved. Since the measurement is performed by using various line segments, there is an advantage that the positional deviation can be detected at high speed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory view showing a segment arrangement state for explaining the operation of the embodiment of FIG. 1, and FIG. FIG. 4 is an explanatory diagram when the reference point and some of the segments are extremely displaced, and FIG. 4 is an explanatory diagram when the segments are vertical. DESCRIPTION OF SYMBOLS 1 ... Sun-shaped 7-segment display element assembly structure, 2 ... Display driver, 3 ... Image sensor, 4 ... Image input part, 5 ...
Binarization processing unit, 6 ... Positional deviation measuring unit, 7 ... Recognition unit.

Claims (1)

[Scope of utility model registration request] 1. An image pickup apparatus which positions a display element at a reference position, photographs the lighting state of the display element, and obtains a segment array state output of the display element as an output, and a display element sent from the image pickup apparatus. The segment arrangement state output is supplied, and the line segments Y, B, and Z which are set in advance and are set so as to be apart from each other in the Y direction and extend in the Z direction, and which intersect with only one segment extending in the Y direction, respectively. Line segments extending in the Z direction, which are set so as to intersect with only one segment extending in the Z direction, information on the coordinate system based on D, and line segments in the YZ direction in which the segments are substantially orthogonal to the above. By comparing the segment array status output with the information of the coordinate system and the position deviation measuring unit that assumes position deviation with the line segment in the YZ direction, and the position deviation measuring unit Segment positional deviation detecting device for a display device, characterized in that a recognition unit for recognizing.