JPS6135329A - Measuring device for characteristic of display device - Google Patents

Abstract

PURPOSE:To input measurement data on all cells in a short time even when the display device has many cells and perform necessary processing by providing a photodetection part and moving means, selective energizing means, energizing signal storage means, and data processing means. CONSTITUTION:A signal pattern generation part 2 generates a signal pattern for measurement on the basis of data on a set signal pattern and supplies to an object cell to be measured on the display device 6 which is selected by a switch matrix 4. An XY table 8 moves the photodetection part 10 to the position suitable for the measurement of the selected cell on the display device 6. The output signal of the photodetection part 10 is inputted to a data collecting part 12 with a synchronizing signal in synchronism with the signal pattern and the data processing part 14 performs proper arithmetic processing according to characteristics of the display device 6 and an item to be measured. The operations of those parts are all contolled by a control part 16 and characteristics of all cells on the display device 6 are measured automatically.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a display characteristic measuring device for rapidly and automatically measuring the characteristics of a display device in which display elements such as light emitting diodes and liquid crystals are arranged in a planar manner. .

[Prior art and its problems]

The following methods are generally used to measure the brightness or brightness characteristics of display elements such as light emitting diodes and liquid crystals.

For example, in the case of a light emitting diode, first the device to be measured is accurately positioned and mechanically mounted on a jig, electrical connections are made, and a Pli constant current is passed through the lens system. to measure the brightness. By repeating such operations for each required element, a large number of elements were measured.

On the other hand, in the special P1 measurement of a planar display device in which a large number of small display elements are arranged in a grid or the like (hereinafter, such display small elements are referred to as cells), the above-mentioned principles apply. It is possible to measure all cells using the measurement method. However, since displays with a large number of cells have now appeared, such a method requires an impractical increase in the time and effort required for measurement. For example, 200X
In a display device with 200 cells, the total number of cells is 40,000B, so the conventional method has no choice but to extract and measure several cells.

In this case, the partial data thus obtained were statistically processed to estimate the overall characteristics.

Furthermore, it is expected that the number of cells on a display will continue to increase in the future. Therefore, there is a need for a display characteristic measuring device that can adequately handle displays with a medium number of cells of 100,000.

[Essentials of the invention]

”: In order to solve the problems of the prior art described above, the display characteristic measuring device of the present invention includes a light receiving section that receives light from each cell on a display device in which a plurality of cells are arranged in a planar manner. , a moving means for relatively moving the display and the light-receiving section so that the light-receiving section can receive light from any cell on the display; and energizing any cell on the display. A selective energizing means, an energizing signal storage means for storing a signal pattern for the selective energizing section to energize the cells, and a means for collecting output data of the light receiving section and performing data processing are provided. By adopting such a configuration, it is possible to align the display and the light receiving section, select a cell, energize the selected cell, detect light from the energized cell, and collect and collect this data.
Processing is linked as a whole to provide high-throughput measurement of display characteristics.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of a display characteristic measuring device according to an embodiment of the present invention. In the figure, a signal pattern generating section 2 generates a signal pattern for measurement based on the set signal pattern data, and the signal pattern can be learned from the cell to be measured on the display 6 selected by the switch matrix 4. On the other hand, XY
The table 8 moves the light receiving section 10 to a position suitable for measuring the selected cell on the display 1O. The output signal of the light receiving section IO is taken into the data collection tiful 12 in synchronization with the signal pattern by a synchronizing signal, and then subjected to appropriate arithmetic processing in the data processing section 14 according to the characteristics of the display 6 and the items to be measured. The operation of each of these parts is managed by the control section 16, and is controlled so that necessary characteristic measurements are automatically and dynamically performed on all cells on the display 6.

The configuration and operation of the display characteristic measuring apparatus shown in FIG. 1 will be explained in more detail below using FIGS. 2 to 4.

FIG. 2 is a block diagram of the present display characteristic measuring apparatus for explaining the flow of various signals related to measurement, and the same parts as in FIG. 1 are given the same reference numerals. Further, FIG. 3 shows the waveforms of various signals in FIG. 2. FIG. 4 is a flowchart showing the operation of this display characteristic measuring device.

In these figures, the control section 16 first sets in the signal pattern storage section 24 digital data representing the signal pattern to be generated in subsequent measurements.

Then, move the XY table 8 (Fig. 1) to the measurement position, and apply the signal pattern C to the display lO via the switch matrix 4 (Fig. 1, omitted from the signal path in Fig. 2). Give to selected cells.

Signal pattern C by digital-to-analog converter 26
To generate the signal, first, under the control of the control section 16, the sample-clock generation section 22 supplies the sample clock A to the signal pattern storage section 24, thereby using the digital data B read out.

The light from the selected cell (in the case of a non-luminous element such as 11Il crystal, the brightness of the cell surface is measured), the received MlO
The data acquisition unit 1 outputs an output signal according to the characteristics of this cell.
Give to 2. The data acquisition section 12 is also supplied with a high speed sample clock E generated by a high speed sample clock generation section 28 based on the sample clock A. As a result, the output signal is sampled sufficiently densely in synchronization with the signal pattern C, digitized, and then collected in the data acquisition section 12. This type of sampling is performed because the power of signal pattern C is often a relatively simple waveform such as a step waveform or ramp waveform, whereas the output signal is based on the transient response characteristics of the cell, nonlinearity, etc. This is because the waveform becomes complex, and it is necessary to sample it more precisely in order to analyze it. Note that the synchronization signal in FIG. 1 corresponds to the high-speed sample clock E.

The data acquired during the data acquisition M12 in this manner is read out as a signal F, and the data processing section 14 performs necessary data processing. Here, it is checked whether there are any cells left to be measured, and depending on the result, it is determined whether to move the XY table position or not. Of course, data processing may be performed after obtaining data for all cells.

In addition, the data processing unit 14 processes the acquired data by calculating the number (m).The processing performed here usually includes processing such as OK/NG judgment, statistical calculation, and displaying the graph, but the data processing itself Since this is not the gist of the present invention, a detailed explanation will be omitted.

〔Effect of the invention〕

As explained above, according to the present invention, even for display devices with an extremely large number of cells, it is possible to import measurement data for all cells in a short time and perform the necessary processing, thereby ensuring reliable product evaluation. It has the effect of increasing

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the display characteristic measuring device according to the present invention, FIG. 2 is a block diagram of the present display characteristic measuring device for explaining the flow of various signals related to measurement, and FIG. 3 is a block diagram of the present display characteristic measuring device.
FIG. 4 is a flowchart showing the operation of the present display characteristic measuring device. 2. Signal pattern generator, 4° switch matrix, 6-display, 8: XY
Table, 10 Light receiving section, 12, Data acquisition section,
14: data processing section, 16 control section, 22: sample clock generation section, 24: signal pattern storage section, 26: digital-to-analog converter, 28: high-speed sample clock generation section.

Claims (1)

[Scope of Claims] A light-receiving section that receives light from each display element on a display device in which a plurality of display elements are arranged in a planar manner; a moving means that allows the light receiving section to receive light from an arbitrary display element on the display; a selective energizing means that energizes an arbitrary display element on the display; A display characteristic measuring device comprising: energizing signal storage means for storing a signal pattern for energizing a display element; and means for collecting output data of the light receiving section and processing the data.