Liquid crystal display panel and bar code reading system using same

A liquid crystal display and bar code technology, which is applied to record carriers, optics, instruments and other directions used by machines, can solve problems such as inability to read, and achieve the effect of correct reading.

Inactive Publication Date: 2006-05-03
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the present inventors attempted to read a barcode by using a barcode reading device using a low-output laser light as a light source to fabricate a liquid crystal display using a ferroelectric liquid crystal having a memory-like operation mode, and to display a barcode on the liquid crystal display. , it turns out that there is a problem that it cannot read

Method used

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  • Liquid crystal display panel and bar code reading system using same
  • Liquid crystal display panel and bar code reading system using same
  • Liquid crystal display panel and bar code reading system using same

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no. 1 Embodiment approach

[0049] figure 2 It is a sectional view showing the structure of the liquid crystal display panel according to the embodiment of the present invention. Such as figure 2 As shown, the liquid crystal display panel 1 is composed of a pair of glass substrates 13a, 13b sandwiching a liquid crystal layer 12 having a thickness of about 2 μm, and a sealing material 17 connecting the two glass substrates 13a, 13b. On the opposing surfaces of the glass substrates 13a, 13b, a plurality of pixel dots are arranged in a matrix to form electrodes (ITO) 14a, 14b, and alignment films 15a, 15b are arranged thereon for alignment treatment.

[0050] Furthermore, a first polarizing plate 11a is provided on the outside of one glass substrate (hereinafter referred to as "first glass substrate") 13a. On the outside of another glass substrate (hereinafter referred to as "second glass substrate") 13b, a second polarizing plate 11b having a polarization axis different from that of the first polarizin...

no. 2 Embodiment approach

[0066] The relationship between the transmission axis direction of the first polarizing plate 11a, the molecular major axis direction of the ferroelectric liquid crystal, and the orientation of the barcode in the second embodiment is different from that in the first embodiment. The other structures are the same as those of the first embodiment, so they will not be described again.

[0067] Figure 8 or Figure 9 It is a graph showing the relationship between the transmission axis direction of the first polarizing plate 11a, the molecular major axis direction of the ferroelectric liquid crystal, and the orientation of the barcode in the second embodiment. Such as Figure 8 or Figure 9 As shown, in the second embodiment, the angle formed by the average molecular major axis direction M of the liquid crystal in the first ferroelectric state and the transmission axis P1 of the first polarizing plate 11a is 45° or approximately 45°. Since the angle formed by the transmission ax...

no. 3 Embodiment approach

[0073] Figure 10 It is a block diagram showing the configuration including the drive circuit unit of the liquid crystal display panel 1 according to the third embodiment. Such as Figure 10 As shown, the liquid crystal display screen 1 has: a display part 31 for displaying a display 3 of a barcode 2 and letters or numbers, and a display 4 of numbers under the barcode 2, and a scanning side IC (integrated circuit) for sequentially selecting the scanning electrodes of the display part 31 ) 32, a signal side IC 33 that applies a voltage corresponding to the display data to the signal electrodes of the display unit 31, and a display control unit 34 that controls the ICs 32 and 33 on the scanning side and the signal side.

[0074] In addition, the liquid crystal display 1 further includes a data conversion unit 35 and a sensor 36 . The data conversion unit 35 converts the original display data into data in which the orientation displayed by the original display data is rotated b...

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PUM

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Abstract

The polarization of the liquid crystal display (1) installed on the side irradiated by the light of the bar code reading device, which uses the electro-optic effect of the liquid crystal to display the bar code composed of black bars of various widths arranged in parallel at various intervals The direction of the transmission axis (P1) of the light plate coincides with the polarization direction of the light. In addition, the direction of the transmission axis (P1) of the polarizing plate is made to be parallel or substantially parallel to the short side direction of each bar constituting the barcode. Then, make the molecular major axis direction (M) of the liquid crystal molecules (LCM) in the first ferroelectric state or the second ferroelectric state parallel or substantially parallel to the direction of the transmission axis (P1) of the polarizing plate, Or form an angle of 45° or approximately 45°.

Description

technical field [0001] The present invention relates to a liquid crystal display, in particular to a liquid crystal display capable of displaying barcodes and a barcode reading system using the same, which can be read after being irradiated with light polarized in a specific direction. Background technique [0002] In the prior art, in supermarkets and other retail stores, etc., on the labels placed on the shelves displaying goods, the name and price of the goods are displayed with barcodes, and the goods are sold through POS (commodity price management system) by using the barcodes. The management system is in use. The cargo tags used in this system are called "electronic cargo tags". In an ordinary electronic goods label, the product name and price are displayed on the liquid crystal display, and a paper strip with a printed barcode is also attached. In addition, it has been proposed to display not only a product name and a price but also a barcode on a liquid crystal di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G02F1/1335G02F1/141G06K19/00
CPCG02F1/141G06K7/1095G02F1/133531
Inventor 胜吕彰近藤真哉
Owner CITIZEN WATCH CO LTD
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