JP3287581B2 - Display device with input function and electronic device using the same - 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 having an input function and an electronic apparatus using the same.

[0002]

2. Description of the Related Art In consideration of the information society in the future, it is expected that a tool capable of instantaneously inputting and outputting information irrespective of time and place is required. As one direction for achieving this, there are electronic devices such as a notebook computer which is thin and lightweight, and which is easy to carry, and a palmtop computer which can be mounted on the palm of a hand, and various companies are actively developing it.

However, in order to carry it as a notebook, the current computer is still thick and heavy, so it is necessary to achieve a thinner and lighter computer. To this end, the thinness and light weight of the input device and the display device, which are the peripheral components of the computer, largely depend on the computer. The present invention
Against this background, the input device and the display device are integrated into a new structure, which has never been realized before, so that the thickness and weight can be reduced. Conventionally, when an input device and a display device are integrated, an input device A and a display device B are bonded together with a double-sided adhesive tape 10 as shown in FIG. As the input device A, a transparent touch panel, the display device B
As such, a liquid crystal display panel was mainly used. For example, a transparent touch panel is composed of a thin glass of about 0.3 mm having a transparent electrode 4a formed on a first substrate 1 or a plastic film substrate of about 0.1 to 0.2 mm, and a 1.1 m having a transparent electrode 4b formed thereon.
m thick glass substrates 2a are arranged opposite to each other. In the liquid crystal display panel, the liquid crystal layer 7 includes a transparent electrode 5a,
5b is sandwiched between the lower glass substrate 2b and the third substrate 3,
The structure was such that the polarizing plate 8 was disposed outside the two substrates.

[0004]

However, in the case of such a conventional structure and structure, the thickness of the input device and the display device and the thickness of the adhesive for lamination are increased, so that the thickness of the glass substrate is considerably increased. Is required because three or four sheets are required. In addition, since the thickness from the input surface to the liquid crystal layer is large, there is a problem that the difference between the input point and the display point becomes large due to parallax.

[0005] In order to solve such a conventional problem, the present invention devises an integrated structure of an input device and a display device, and a substrate material used for the input device and the display device. It is an object of the present invention to provide a display device with an input function in which a shift due to parallax is small.

Further, conventional notebook computers and palmtop computers have the above-described problems inevitably because they are assembled by overlapping an input device and a display device. Another object of the present invention is to provide a thin, lightweight, and portable electronic device by assembling the display device with an input function.

[0007]

In the display device with an input function according to the present invention, the first input substrate on which the input electrodes are formed, the input electrodes and the display electrodes are formed on different surfaces. A second substrate, and a third substrate on which a display electrode is formed, wherein the first substrate and the second substrate are arranged so that the input electrodes face each other, and the second substrate and the third substrate In a display device with an input function, in which liquid crystal is arranged between the substrates and the display electrodes are arranged so as to face each other, the second substrate is a glass substrate or a plastic substrate, and the first substrate is , And the third substrate also serve as a polarizing plate.
The substrate is thinner than the second substrate.

Further, an electronic apparatus according to the present invention is characterized in that the display device with an input function according to any one of the above is incorporated as a display unit and an input unit.

[0009]

In the display device with the input function configured as described above, the number of substrates is reduced, so that the display device can be made thinner and lighter. Further, since light transmission loss is reduced and a high light transmittance can be maintained, a bright and easy-to-view display can be obtained.

Further, as shown in FIG. 3, since only one common board is provided between the input unit and the display unit by the writing instrument 15, the distance between the input unit and the display unit is reduced, and the writing input point 15 Parallax C from the display point can be reduced.

[0011]

EXAMPLES [Reference Example 1] FIG. 1 is an input-capable display device according to Embodiment 1,
1 is a first substrate for input, 2 is a second substrate common to the input side and display side, 3 is a third substrate for display, 4a and 4b are transparent electrodes for input, 5a and 5b are transparent electrodes for display. , 6a is a seal for the input section, 6b is a seal for the display section, 7 is a liquid crystal, and 8 is a polarizing plate.

Here, a 0.18 mm thick uniaxially stretched polyester (hereinafter referred to as PET) film is formed on the first substrate 1, and the second substrate 2
Then, a display device with an input function was manufactured using 0.7 mm thick glass and a 0.18 mm thick uniaxially stretched PET film for the third substrate 3.

[0013] Thereby, it is significantly thinner and lighter than before,
Moreover, a display device with an input function that is bright and has small parallax is obtained.

Embodiment 1 FIG. 2 shows a display device with an input function according to Embodiment 1 of the present invention. Reference numeral 11 denotes a first input substrate also serving as a polarizing plate;
Is a second substrate common to the input side and the display side, 13 is a third substrate for display which also serves as a polarizing plate, 9 is a reflector, and the other configuration is the same as that of the first embodiment.

Here, a 0.2 mm-thick polyether sulfone (hereinafter referred to as PES) film with a polarizing film having a thickness of 0.2 mm is formed on the first substrate 11, a 1.1 mm-thick glass is formed on the second substrate 12, and a third substrate 13 is formed on the third substrate 13.
A reflective display device with an input function was manufactured using a PES film with a polarizing film having a thickness of 0.2 mm.

REFERENCE EXAMPLE 2 In the reference example 1 , a transmission type display device with an input function was manufactured using a PES film integrated with a polarizing film also serving as a polarizing plate as the first substrate.

[ Embodiment 2 ] In Reference Examples 1 and 2 and Embodiment 1 , the second substrate has a thickness of 0.3 mm.
A display device with an input function was fabricated using a plastic substrate having a thickness of 2.0 mm.

[Embodiment 3] A prototype of a keyboardless handwriting input personal computer incorporating the display device with an input function manufactured in Reference Examples 1 and 2 and Embodiments 1 and 2 was produced. In comparison, thinner and lighter can be achieved, and further, the appearance can be significantly improved by improving the transmittance and reducing the parallax.

[0019]

As described above, the display device with an input function according to the present invention has a three-substrate configuration and the third substrate is thinner than the second substrate. And an effect of improving appearance by improving transmittance. Furthermore, since a glass substrate or a plastic substrate is used as the second substrate and a flexible substrate is used as the third substrate, the thickness of the liquid crystal layer hardly changes even when the first substrate is pressed, and the display characteristics are good. A display device with a simple input function is realized. Further, the first substrate or the third substrate serves as a polarizing plate.
Because it also serves as a flexible and thinner and lighter
I can .

An electronic device incorporating such a display device with an input function has the advantages of excellent portability, small parallax between an input point and a display point, and good handwriting input characteristics.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a display device with an input function according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a display device with an input function according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing parallax in the present invention.

FIG. 4 is a cross-sectional view of a conventional display device with an input function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st board | substrate 2 ... 2nd board | substrate 2a ... Thick glass board 2b ... Lower thick glass board 3 ... 3rd board | substrate 4a, 4b ... Input transparent electrode 5a, 5b ... Display transparent electrode 6a, 6b ... Seal 7 ... Liquid crystal Reference Signs List 8 polarizing plate 9 reflecting plate 10 adhesive tape 11 first substrate 12 second substrate 13 third substrate 14 writing input point 15 writing implement

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-278926 (JP, A) JP-A-59-191011 (JP, A) JP-A-56-97318 (JP, A) JP-A-61-278318 243428 (JP, A) JP-A-62-258422 (JP, A) JP-A-2-310523 (JP, A)

Claims (2)

(57) [Claims] An input first substrate on which input electrodes are formed, a second substrate on which input electrodes and display electrodes are formed on different surfaces, and a third substrate on which display electrodes are formed. A substrate, wherein the first substrate and the second substrate are arranged such that the respective input electrodes face each other, and the second substrate and the third substrate are each provided with a liquid crystal arranged therebetween and each In the display device with an input function in which the display electrodes are arranged so as to face each other, the second substrate is a glass substrate or a plastic substrate, and the first substrate and the third substrate also serve as polarizing plates, The display device with an input function, wherein the third substrate is thinner than the second substrate. 2. An electronic apparatus, wherein the display device with an input function according to claim 1 is incorporated as a display unit and an input unit.