JP2000075809A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device having a figure display section of a high contrast and a high-fineness matrix display section in combination. SOLUTION: The display device has a liquid crystal display element 6 and an electric field light emitting display element 15 disposed behind this liquid crystal display element 6. The liquid crystal display element 6 has the matrix display section 12 where pixels 13 are disposed to a matrix form. The electric field light emitting display element 15 is provided with an illumination segment 18 of a rectangular shape at the point corresponding to the matrix display section 12. The matrix display section 12 is illuminated by this illumination segment 18. The liquid crystal display element 6 has a second display section 17 disposed to eight segment mosaic patterns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device having an electroluminescent display element called electroluminescence (EL).

[0002]

2. Description of the Related Art Conventionally, there is an electroluminescent display device 1 as shown in FIG. Such an electroluminescent display element 1 has a number display section 3 in which display segments 2 are arranged in a Japanese character shape and a matrix display section 5 in which pixels 4 are arranged in a matrix.
The number display unit 3 displays numbers by turning each display segment 4 on or off. The matrix display unit 5 displays various characters, figures, symbols, and the like by turning each pixel 4 on or off. The electroluminescent display element 1 is a self-luminous display element, and has an advantage that a backlight device is unnecessary as in a light-receiving display element such as a liquid crystal display element. Further, the electroluminescent display element 1 has the advantages that the contrast is higher and the viewing angle is wider than that of the liquid crystal display element.

[0003]

However, in the electroluminescent display element 1, it is difficult to make the matrix display section 5 high definition (that is, to make the pixel 4 fine) as compared with the liquid crystal display element, There was a problem that characters, figures, symbols, etc. could not be displayed. Further, the back electrode of the electroluminescent display element 1 is formed of a metal layer, and external light such as sunlight is reflected by the metal layer, and the observer may feel dazzling. The present invention has been made in view of the above problems, and provides a display device having both a high-contrast display unit and a high-definition display unit.

[0004]

According to the present invention, there is provided a liquid crystal display device having a polarizing member adhered to a liquid crystal cell, and an electroluminescent display device disposed behind the liquid crystal display device. Wherein the liquid crystal display element has a first display unit in which pixels are arranged in a matrix,
The electroluminescent display element has a second display unit including a plurality of display segments and an illumination segment for illuminating the first display unit.

Further, according to the present invention, the liquid crystal display element has a shielding portion for shielding the second display portion when the second display portion is in a non-display state.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device comprises a liquid crystal display element 6 and an electroluminescent display element 15 disposed behind the liquid crystal display element 6.
Having. The liquid crystal display element 6 has a matrix display section 12 in which pixels 13 are arranged in a matrix. The electroluminescent display element 15 is provided with a rectangular illumination segment 18 at a position corresponding to the matrix display section 12, and the illumination segment 18 illuminates the matrix display section 12.
Further, the electroluminescent display element 6 has a second display section 17 in which display segments 16 are arranged in a Japanese character shape.

[0007] The liquid crystal display element 6 has a rectangular shielding portion 14 at a location corresponding to the second display portion 17. The shielding unit 14 is in a light shielding state when the second display unit 17 is in the non-display state, and is in a transmission state when the second display unit is in the display state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 6 denotes a liquid crystal display element. The liquid crystal display element 6 has a polarizing plate 8 (polarizing member) attached to both front and rear surfaces of a liquid crystal cell 7. The liquid crystal cell 7 has a pair of translucent substrates 9 filled with liquid crystal 10, and the translucent substrates 9 each have a transparent electrode 11 formed thereon. The liquid crystal display element 6 has a matrix display section 12 (first display section).
In the matrix display section 12, pixels 13 are arranged in a matrix. The matrix display unit 12 makes various characters, figures,
Displays symbols etc. Reference numeral 14 denotes a shielding portion, and the shielding portion 1
Reference numeral 4 denotes a light-shielding state when a numerical display section described later is in a non-display state.

Reference numeral 15 denotes an organic EL (electroluminescence display element), which is disposed behind the liquid crystal display element 6. The organic EL 15 has a number display section 17 in which display segments 16 are arranged in a Japanese character shape, and a rectangular illumination segment 18. Numeral display section 17 includes display segments 16
The number is displayed by turning on or off the. The lighting segment 18 is provided at a location corresponding to the segment display unit 12 and illuminates the segment display unit 12. When the number display section 17 is in a non-display state (that is, when all the display segments 16 are turned off), the shielding section 14 of the liquid crystal display element 6 is set in a light shielding state, and when the number display section 17 is in a display state, the light shielding section 14 is transmitted. State.

The organic EL 15 is obtained by forming a transparent electrode 20, an organic layer 21, and a back electrode 22 on a translucent substrate 19. The organic layer 21 is formed by sequentially stacking a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer. The transparent electrode 20 is made of ITO (indium tin oxide), and the back electrode 22 is made of a metal layer such as aluminum. A sealing plate 23 is provided on the rear surface of the back electrode 22.

According to the above-described embodiment, the number display section 17 having high contrast and the matrix display section 1 having high definition are provided.
2 is provided. In addition, since reflected light, such as sunlight, reflected by the back electrode 22 of the organic EL 15 passes through the two polarizing plates 8 of the liquid crystal display element 6, the reflected light can be weakened. In particular, when the number display section 17 is in a non-display state, the shielding section 14 of the liquid crystal display element 6 is in a light shielding state, and therefore, there is no danger that the observer will feel dazzled by the reflected light. The electroluminescent display element may be an inorganic EL, but is preferably an organic EL as in this embodiment.
Can be driven at low voltage.

[0013]

According to the present invention, there is provided a display device comprising: a liquid crystal display element having a polarizing member adhered to a liquid crystal cell; and an electroluminescent display element provided behind the liquid crystal display element.
The liquid crystal display element has a first display unit in which pixels are arranged in a matrix, and the electroluminescent display element illuminates a second display unit including a plurality of display segments and the first display unit. The display device includes an illumination segment, and has both a high-definition first matrix display unit and a high-contrast second display unit.

Further, according to the present invention, the liquid crystal display element has a shielding part for shielding the second display part when the second display part is in a non-display state, and a back surface of the electroluminescent display element. The observer does not feel dazzling due to the reflected light reflected by the electrodes.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing the embodiment.

FIG. 3 is a perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 6 liquid crystal display element 7 liquid crystal cell 8 polarizing plate (polarizing member) 12 matrix display section (first display section) 13 pixel 14 shielding section 15 organic EL (electroluminescent display element) 16 display segment 17 numeric display section (second display section) Display) 18 Lighting segment

Continued on the front page F term (reference) 2H089 HA27 HA31 QA16 TA18 5C094 AA06 AA10 AA11 AA12 AA51 BA27 BA43 CA14 CA19 DA02 DA03 DB05 EA04 EA05 EB02 ED14 FA01 FA02 FB01

Claims (2)

[Claims] 1. A display device comprising: a liquid crystal display element having a polarizing member adhered to a liquid crystal cell; and an electroluminescent display element disposed behind the liquid crystal display element, wherein the liquid crystal display element is Pixels have a first display portion arranged in a matrix, and the electroluminescent display element has a second display portion composed of a plurality of display segments and an illumination segment for illuminating the first display portion. A display device characterized by the above-mentioned. 2. The display device according to claim 1, wherein the liquid crystal display element has a shielding unit that shields the second display unit when the second display unit is in a non-display state. Display device.