JP3093972B2 - Panel temperature control method for electronic display panel and electronic display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel temperature control method for an electronic display panel, such as a plasma display panel or a fluorescent display panel, which performs an electroluminescent display accompanied by heat generation, and to an electronic display panel. The present invention relates to a technique for eliminating a remarkable temperature difference between a central portion and a peripheral portion of a panel.

[0002]

2. Description of the Related Art A plasma display panel is a thin electronic display panel capable of displaying a color image in addition to having a higher luminance and requiring no backlight than a liquid crystal display panel, and is expected to be developed in the future. Display panel. Color plasma display panels
As shown in FIGS. 22 and 23, the front and back glass substrates A and B each having a thickness of, for example, about several mm are disposed at regular intervals (for example, about 5 mm), and a transparent front glass substrate A is provided. , An anode C is formed on the inner surface, while a cathode D is formed on the inner surface of the back glass substrate B. With the start of power supply to the anode C and the cathode D, a plasma P is generated between the anode C and the cathode D. Then, when the ultraviolet light generated by the plasma P hits the phosphor E,
The display light is obtained, and the display is visually recognized through the transparent front glass substrate A. Note that the panel in FIG. 22 is a transmission type, and the panel in FIG. 23 is a reflection type. In addition, the color plasma display panel can have a large screen,
At present, about 40 inches are starting to appear.

[0003]

However, the above-described large-screen plasma display panel has a problem that the glass substrates on both the front and back sides are easily damaged. During the light-emitting display operation of the large-screen plasma display panel, a remarkable temperature difference is generated between the panel central portion and the panel peripheral portion. The peripheral portion of the panel is easily dissipated by the attachment of electrodes and the like, so that an excessive rise in temperature can be suppressed. However, the central portion of the panel is a lighting area, where power is concentrated and heat is easily generated, and heat is hardly dissipated. As a result, the temperature at the peripheral portion of the panel becomes close to the ambient temperature, the temperature at the central portion of the panel becomes high, and a remarkable temperature difference is generated between the peripheral portion of the panel and the central portion of the panel. If the distortion caused by the temperature difference between the peripheral portion of the panel and the central portion of the panel cannot be tolerated, the glass substrate will be damaged.

Therefore, the entire panel may be cooled to prevent a significant temperature difference between the peripheral portion of the panel and the central portion of the panel. However, in this case, although the problem of the temperature difference between the peripheral portion of the panel and the central portion of the panel can be solved, it is necessary to avoid arranging a visual obstacle on the front surface for the purpose of the display panel. There is another problem that the arrangement of the cooling means is complicated, the configuration of the cooling means becomes complicated and large, and the cost increases.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an electronic display capable of appropriately preventing damage to a panel due to a temperature difference between a central portion and a peripheral portion during a light emitting display operation of the electronic display panel. It is an object to provide a panel temperature control method for a panel and an electronic display panel.

[0006]

The present invention has the following configuration to achieve the above object. That is, the panel temperature control method for an electronic display panel according to the first aspect of the present invention provides a method of controlling the temperature of a panel of an electronic display panel, which performs an electroluminescent display involving heat generation, by heating a peripheral portion of the panel. Is controlled so that the temperature becomes substantially uniform.

An electronic display panel according to a second aspect of the present invention is an electronic display panel for performing an electroluminescent display accompanied by heat generation, wherein a heating means installed around the panel includes:
A driving means for operating the heating means so that the entire display panel has a substantially uniform temperature is provided.

According to a third aspect of the present invention, there is provided an electronic display panel according to the second aspect.
The heating means is divided into a plurality of parts so as to be operated independently along the periphery of the panel.

According to a fourth aspect of the present invention, there is provided an electronic display panel according to the second or third aspect, further comprising a peripheral temperature measuring section for measuring a temperature of a peripheral portion of the panel. A signal generation unit that outputs a reference signal corresponding to a reference temperature for temperature control, wherein the driving unit operates the heating unit based on a difference between the temperature signal from the peripheral temperature measurement unit and the reference signal. It is to control.

The electronic display panel according to a fifth aspect of the present invention is the electronic display panel according to the fourth aspect,
A central temperature measuring section for measuring the temperature is provided at the center of the panel, and this central temperature measuring section is a signal generating section for outputting a reference signal.

[0011]

The method of controlling the temperature of the electronic display panel of the present invention and the operation of the electronic display panel will be described below. In the panel temperature control method for an electronic display panel according to the first aspect of the present invention, during the light emitting display operation of the electronic display panel, the panel peripheral portion, which is a non-display portion, is heated and heated to increase the temperature of the panel peripheral portion. Is substantially the same as the temperature at the center of the panel, which is high in electroluminescent display. In other words, the inventors have noticed that if the substrate such as glass on the surface of the electronic display panel is at or below the melting temperature, the expansion of the non-uniform temperature distribution (temperature difference) leads to damage rather than the temperature itself. The present invention was able to reach the present invention by changing the concept of heating, which is the opposite of cooling, which is a common sense of measures against high temperatures.

In the electronic display panel according to the second aspect of the present invention, during the light-emitting display operation, the heating means provided at the periphery of the panel is operated by the driving means to heat the periphery of the panel to increase the temperature. The temperature at the periphery of the panel is substantially the same as the temperature at the center of the panel, which is high in electroluminescent display.

[0013] In the electronic display panel according to the third aspect of the present invention, each of the heating means divided along the panel peripheral portion independently heats the panel peripheral portion.

In the electronic display panel according to the fourth aspect of the present invention, the driving means controls the temperature in a feedback manner so that the peripheral portion of the panel becomes the reference temperature for the temperature control.

In the electronic display panel according to the fifth aspect of the present invention, the driving means controls the temperature in a feedback manner so that the temperature at the periphery of the panel becomes the measured temperature at the center of the panel.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic plan view of a color plasma display panel according to the embodiment (hereinafter abbreviated as “display panel” as appropriate), FIG. 2 is a schematic side view of the display panel according to the embodiment, and FIG. FIG. 4 is a plan view showing a resistor, and FIG. 4 is a block diagram showing a panel temperature control system of the embodiment.

As shown in FIGS. 22 and 23, the display panel (electronic display panel) shown in FIG. 1 has glass substrates A and B on both the front and back sides having a thickness of, for example, about several millimeters. (Approximately 5 mm). An anode C is formed on the inner surface of the transparent front glass substrate A, while a cathode D is formed on the inner surface of the rear glass substrate B. With the start of the supply of power to the anode C and the cathode D, a plasma P is generated between the electrodes C and D. The display light is obtained by the ultraviolet rays generated by the plasma P hitting the phosphor E, and the display is visually recognized through the transparent front glass substrate A.

On the front side of the display panel, a total of 16 heating resistors 1 are provided along the left, right, upper and lower peripheral portions of the panel. Each heating resistor 1 generates heat by individual energization, and can independently heat the peripheral portion of the panel.

As shown in FIG. 3, each heating resistor 1 is provided with a peripheral temperature sensor 2 as a peripheral temperature measuring section, while a central temperature measuring section is provided at the center of the back side of the display panel. A central temperature sensor 3 is provided.

As the heating resistor 1, a thin-film resistor, a film resistor, a linear resistor such as a nichrome wire or the like can be used. The peripheral temperature sensor 2 and the central temperature sensor 3 may be any as long as they can measure a required temperature range, such as a thermocouple, a thermistor, or a semiconductor temperature sensor.

A peripheral temperature signal SA indicating the temperature of the peripheral portion of the panel is sent from a peripheral temperature sensor 2 provided for each heating resistor 1 to a comparator 4, while a central temperature sensor 3
The center temperature signal SB indicating the temperature at the center of the panel is also sent to the comparator 4. The comparator 4 outputs a difference signal ΔS corresponding to a difference between the peripheral temperature signal SA and the central temperature signal SB to the voltage regulator 5. The larger the difference signal ΔS, the greater the temperature difference between the panel peripheral portion and the panel central portion.

The voltage regulator 5 supplies electric power of a magnitude proportional to the difference signal ΔS to the heating resistor 1. A current proportional to the temperature difference flows through the heating resistor 1 to heat the peripheral portion of the panel, thereby reducing the temperature difference between the peripheral portion of the panel and the central portion of the panel. In other words, in the display panel of the embodiment, precise panel temperature control is performed by the feedback method. The central part of the panel is kept at the same temperature.

In the above case, FIG.
The temperature control system shown in FIG.
Was able to control the temperature independently, but all the resistors for heating were continuous and one resistor, and there was only one peripheral temperature sensor. A configuration for controlling the panel temperature in advance may be used.

Further, a configuration may be adopted in which a reference voltage generator is provided in place of the central temperature sensor 3 and a reference temperature signal corresponding to a reference temperature for temperature control is used instead of the central temperature signal SB. In this case, in order to obtain a more uniform temperature distribution, the lighting power value on the display panel is monitored by a processing unit such as a microcomputer, and the reference temperature signal is automatically changed according to the lighting power value, or Alternatively, the configuration may be such that the reference temperature signal is automatically changed in accordance with the ambient temperature or the surrounding air volume.

FIG. 5 is a schematic plan view of a display panel according to another embodiment, FIG. 6 is a schematic side view of the display panel of FIG. 5, and FIG. 7 is a perspective view showing a coil device for applying a high-frequency electric field as heating means. FIG. 8 is a block diagram showing a panel temperature control system of this embodiment.

In this display panel, a magnetic material (for example, iron, nickel, ferrite, etc.) 6 is provided along the front and back surfaces of the left, right, upper and lower peripheral portions of the panel.
A total of 16 coil devices 7 for applying a high-frequency magnetic field are arranged so as to be individually excitable along the left, right, upper and lower peripheral portions of the panel. Each coil device 7 has a configuration in which a coil 9 is wound an appropriate number of times around a substantially C-shaped magnetic pole piece 8 which is partially opened to form a gap (magnetic gap). It is installed to be located in.

In each of the coil devices 7, when a high-frequency current flows through the coil 9, a high-frequency magnetic field is generated in the magnetic gap. Then, the magnetic body 6 located in the magnetic gap of the pole piece 8 is heated by the principle of electromagnetic heating, and at the same time, the peripheral portion of the panel is heated to increase the temperature. In the vicinity of each coil device 7, an ambient temperature sensor 10 as an ambient temperature measuring unit is provided.
On the other hand, on the back side of the display panel, a central temperature sensor 11 is provided at a central portion as a central temperature measuring section.

A peripheral temperature signal SA indicating the temperature of the peripheral portion of the panel is sent from each peripheral temperature sensor 10 provided at each coil device 7 to the comparator 12, while the temperature of the central portion of the panel is also transmitted from the central temperature sensor 11. Is sent to the comparator 12. The comparator 12 generates a difference signal Δ corresponding to a difference between the peripheral temperature signal SA and the central temperature signal SB.
S is output to the voltage amplifier 13. The larger the difference signal ΔS, the greater the temperature difference between the panel peripheral portion and the panel central portion.

The voltage amplifier 13 amplifies the high-frequency oscillation output of the oscillator 14 according to the difference signal ΔS and outputs the amplified output to the coil 9. A high-frequency current flows through the coil 9 to generate a high-frequency magnetic field in the magnetic gap that is proportional to the temperature difference, thereby heating the magnetic body 6 and, at the same time, heating the periphery of the panel to increase the temperature, thereby reducing the temperature difference from the center of the panel. Will be. In this way, the display panel of this embodiment also performs the precise panel temperature control by the feedback method.

FIG. 9 is a schematic plan view of a display panel according to another embodiment, FIG. 10 is a schematic side view of the display panel of FIG. 9, FIG. 11 is a perspective view showing a capacitor structure serving as heating means, and FIG. It is a block diagram showing a panel temperature control control system of an example.

In this display panel, a dielectric 15 is provided by coating or bonding along the front and back surfaces of the left, right, upper and lower peripheral portions of the panel, and a total of 16 electrode pairs 16 for applying a high-frequency electric field are also provided. It is arranged so that a voltage can be individually applied along the left, right, upper and lower panel peripheral portions. The dielectric 15 is not limited to a specific material, but is preferably a material having a large dielectric constant and a large dielectric loss. Each electrode pair 16
As shown in FIG. 10 and FIG.
And two electrodes 16a, 16b.
The capacitor structure is formed by facing the dielectric 16b with the dielectric 15 therebetween.

When high frequency power is supplied to the electrode pair 16,
A high-frequency electric field is generated between the electrodes 16a and 16b, and heat is generated due to dielectric loss of the dielectric 15, so that the peripheral portion of the panel is heated and the temperature rises. A peripheral temperature sensor 17 as a peripheral temperature measuring unit is provided at the electrode pair 16, while a central temperature sensor 18 as a central temperature measuring unit is provided at the center on the back side of the display panel. Have been.

A peripheral temperature signal SA indicating the temperature at the peripheral portion of the panel is sent from each peripheral temperature sensor 17 provided for each electrode pair 16 to the comparator 19, and the temperature at the panel central portion is also transmitted from the central temperature sensor 18 to the comparator 19. Central temperature signal SB shown
Is sent to the comparator 19. The comparator 19 outputs a difference signal ΔS corresponding to a difference between the peripheral temperature signal SA and the central temperature signal SB to the power amplifier 20. The larger the difference signal ΔS, the greater the temperature difference between the panel peripheral portion and the panel central portion.

The power amplifier 20 amplifies the high frequency oscillation output of the oscillator 21 with a magnitude proportional to the difference signal ΔS and outputs the amplified high frequency oscillation output to the electrode pair 16. A high-frequency electric field proportional to the temperature difference is generated between the electrodes 16a and 16b, and the dielectric 15 is strongly heated. At the same time, the peripheral portion of the panel is heated and the temperature rises, so that the temperature difference from the central portion of the panel is reduced. . As described above, the display panel of this embodiment also performs precise panel temperature control by the feedback method.

FIG. 13 is a schematic plan view of a display panel according to another embodiment, FIG. 14 is a schematic side view of the display panel of FIG. 13, and FIG. 15 is a block diagram showing a panel temperature control control system of this embodiment. .

In this display panel, the heat ray absorber 22 is provided so as to be individually lit by applying or sticking along one surface side of the peripheral portion of the left, right, upper and lower panels, and a total of one for each of the left, right, upper and lower sides is provided. Four rod-shaped infrared heaters 23 to 26 are provided so that the longitudinal direction matches the longitudinal direction of the heat ray absorber 22. Behind each rod-shaped infrared heater, for example, as shown in FIG. 14, a reflection plate 27 is provided. The heat rays generated by the lighting of the rod-shaped infrared heaters 23 to 26 are absorbed by the heat ray absorber 22 directly or via the reflection plate 27 to heat the periphery of the panel.
Examples of the heat ray absorber 22 include a carbon paste coating layer.

As shown in FIG.
A peripheral temperature sensor 28 as a peripheral temperature measuring unit is provided at each location, while a central temperature sensor 29 as a central temperature measuring unit is provided at the center on the back side of the display panel.

A peripheral temperature signal SA indicating the temperature of the peripheral portion of the panel is sent from each peripheral temperature sensor 28 to the comparator 30, while a central temperature signal SB indicating the temperature of the central portion of the panel is also sent from the central temperature sensor 29 to the comparator 30. Sent to The comparator 30 outputs a difference signal ΔS corresponding to the difference between the peripheral temperature signal SA and the central temperature signal SB to the power amplifier 31. The larger the difference signal ΔS, the greater the temperature difference between the panel peripheral portion and the panel central portion.

The power amplifier 31 outputs electric power to each infrared heater in an amount proportional to the difference signal ΔS, turns on the infrared heater, and irradiates a heat ray to the heat ray absorber 22. Heat ray absorber 2
The peripheral portion of the panel is heated by the heat rays absorbed in 2, and the temperature rises, and the temperature difference from the central portion of the panel is reduced. The display panel of this embodiment is also a precise panel temperature control by a feedback system.

FIG. 16 is a schematic plan view of a display panel according to another embodiment, FIG. 17 is a schematic side view of the display panel of FIG. 16, FIG. 18 is a plan view showing a hot air supply pipe as heating means, and FIG. It is a block diagram which shows the panel temperature control control system of this Example.

In this display panel, the left, right, upper, and lower ones along the back side of the peripheral portion of the left, right, upper, and lower sides, respectively, make a total of four.
The hot air supply pipes 33 are provided so that the longitudinal direction is along the sides. As shown in FIG. 18, each hot-air supply pipe 33 has hot-air outlets 34 opened at equal intervals along the longitudinal direction, so that hot air from the hot-air outlets 34 heats the peripheral portion of the panel. I have. Hot air is supplied to each hot air supply pipe 33 from a hot air supply source 35 via a flow rate control valve 36.

As shown in FIG. 16, peripheral temperature sensors 37 as peripheral temperature measuring sections are provided at four locations around the panel, while a central temperature measuring section is provided at the center on the back side of the display panel. A central temperature sensor 38 is provided as a unit.

A peripheral temperature signal SA indicating the temperature at the peripheral portion of the panel is sent from each peripheral temperature sensor 37 to the comparator 39, while a central temperature signal SB indicating the temperature at the central portion of the panel is sent from the central temperature sensor 38 to the comparator 39. Sent to The comparator 39 outputs a difference signal ΔS corresponding to the difference between the peripheral temperature signal SA and the central temperature signal SB to the valve controller 40. The larger the difference signal ΔS, the greater the temperature difference between the panel peripheral portion and the panel central portion.

The valve controller 40 controls the opening amount of the flow control valve 36 so that the flow is proportional to the magnitude of the difference signal ΔS. When the temperature at the peripheral portion of the panel is lower than the temperature at the central portion of the panel, the hot air passes through the flow control valve 36 and exits from the hot air supply pipe 33 to heat the peripheral portion of the panel. The difference will be narrowed. Again, the display panel of this embodiment is also a precise panel temperature control by the feedback system.

FIG. 20 is a schematic plan view of a display panel according to another embodiment, and FIG. 21 is a block diagram showing a panel temperature control system of this embodiment.

In this display panel, the left, right, upper and lower ones along the back side of the left, right, upper and lower peripheral portions of the panel have a total of four.
The rod-shaped radiator 41 is provided so that the longitudinal direction is along the side. Each rod-shaped radiator 41 has a passage formed therein through which the heated gas passes, and is disposed in close contact with a panel peripheral portion. On the other hand, as shown in FIG.
As shown at 0, gas is supplied from a gas supply source (blower) 42 via a heater 43. Then, while the heating gas passes through the internal passage of the rod-shaped radiator 41, the heat of the heating gas is transmitted to the peripheral portion of the panel.

A peripheral temperature sensor 44 as a peripheral temperature measuring section is provided at each of the four positions around the panel, while a central temperature sensor 45 as a central temperature measuring section is provided at the center on the back side of the display panel. Is provided.

A peripheral temperature signal SA indicating the temperature of the peripheral portion of the panel is sent from each peripheral temperature sensor 44 to the comparator 46, while a central temperature signal SB indicating the temperature of the central portion of the panel is also sent from the central temperature sensor 45 to the comparator 46. Sent to Comparator 46 outputs a difference signal ΔS corresponding to the difference between peripheral temperature signal SA and central temperature signal SB to power amplifier 47. The larger the difference signal ΔS, the greater the temperature difference between the panel peripheral portion and the panel central portion.

The power amplifier 47 outputs electric power proportional to the magnitude of the difference signal ΔS to the heater 43. Heater 4
The heating gas heated to a temperature proportional to the temperature difference in 3 heats the peripheral portion of the panel while passing through the internal passage of the rod-shaped radiator 41 to increase the temperature, thereby reducing the temperature difference between the peripheral portion of the panel and the central portion of the panel. The display panel of this embodiment also has
Precise panel temperature control by feedback system.

The present invention is not limited to the above embodiment, but can be variously modified. (1) In each of the above embodiments, precise panel temperature control is performed by a feedback method, and even if there is a disturbance such as a change in ambient temperature, an increase or decrease in panel heat generation, or a voltage of supply power,
During the display operation, the panel peripheral portion and the panel central portion are configured to be kept at the same temperature. However, it is not always necessary to perform panel temperature control by a feedback method, and an open loop panel temperature control may be used.

(2) In the above embodiment, a temperature control system is provided for each heating means, and each heating means performs panel temperature control independently. However, one heating means is used. The temperature control system may be configured to perform panel temperature control.

(3) The heating means of each embodiment may be mounted not only on the front side of the display panel, but also on the back side, or on both sides.

[0053]

According to the panel temperature control method according to the first aspect of the present invention, during the light-emitting display operation of the electronic display panel, the peripheral portion of the panel, which is the non-display portion, has a high temperature during the display operation. Since the temperature rises to almost the same as the temperature of the panel and the temperature difference between the panel periphery and the panel center is reduced, it is possible to effectively prevent damage to the panel due to uneven temperature distribution (temperature difference) on the panel surface. Can be. Since the panel is prevented from being damaged by heating instead of cooling, the required structure is simple and easy to reduce the size, the cost can be reduced, and the panel can be prevented from being damaged in an appropriate form.

According to the electronic display panel of the second aspect of the present invention, during the light emitting display operation, the peripheral portion of the panel is heated, and the temperature difference between the peripheral portion of the panel and the central portion of the panel becomes small. Can be prevented from being damaged due to uneven temperature distribution (temperature difference).
Since the prevention of damage to the panel is not a cooling means but a heating means, the necessary configuration is simple, the size can be easily reduced, and the cost can be reduced. As a result, the prevention of damage to the panel can be realized in an appropriate form.

In the electronic display panel according to the third aspect of the present invention, the heating means divided so as to be capable of independently performing a heating operation along the peripheral portion of the panel is suitable for each temperature condition of the peripheral portion of the panel. As a result of sufficient heating, unevenness of the temperature distribution on the panel surface is sufficiently eliminated, so that the panel is less likely to be damaged.

In the electronic display panel according to the fourth aspect of the present invention, since the peripheral temperature measuring section is feedback-controlled so as to be a reference temperature for temperature control, the temperature difference between the panel peripheral portion and the panel central portion. Is smaller, and damage to the panel is less likely to occur.

In the electronic display panel according to the fifth aspect of the present invention, since the peripheral temperature measuring section is feedback-controlled so as to be the measured temperature at the center of the panel, the temperature difference between the peripheral portion of the panel and the central portion of the panel is reduced. Practically disappears, and damage to the panel is extremely unlikely to occur.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a color plasma display panel according to an embodiment.

FIG. 2 is a schematic side view of the color plasma display panel of FIG.

FIG. 3 is a plan view showing a heating resistor as a heating unit.

FIG. 4 is a block diagram illustrating a panel temperature control control system of the display panel of FIG. 1;

FIG. 5 is a schematic plan view of a color plasma display panel according to another embodiment.

6 is a schematic side view of the color plasma display panel of FIG.

FIG. 7 is a perspective view showing a coil device for applying a high-frequency electric field as a heating unit.

8 is a block diagram showing a panel temperature control control system of the display panel of FIG.

FIG. 9 is a schematic plan view of a color plasma display panel according to another embodiment.

FIG. 10 is a schematic side view of the color plasma display panel of FIG.

FIG. 11 is a perspective view showing a capacitor structure as a heating unit.

FIG. 12 is a block diagram showing a panel temperature control control system of the display panel of FIG. 9;

FIG. 13 is a schematic plan view of a color plasma display panel according to another embodiment.

FIG. 14 is a schematic side view of the color plasma display panel of FIG.

FIG. 15 is a block diagram showing a panel temperature control control system of the display panel of FIG.

FIG. 16 is a schematic plan view of a color plasma display panel according to another embodiment.

FIG. 17 is a schematic side view of the color plasma display panel of FIG.

FIG. 18 is a plan view showing a hot air supply pipe as a heating unit.

19 is a block diagram showing a panel temperature control control system of the display panel of FIG.

FIG. 20 is a schematic plan view of a color plasma display panel according to another embodiment.

21 is a block diagram showing a panel temperature control control system of the display panel of FIG.

FIG. 22 is a schematic diagram showing a basic configuration of a transmission type color plasma display panel.

FIG. 23 is a schematic diagram showing a basic configuration of a reflection type color plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heating resistor 2,10,17,28,37,44 ... Ambient temperature sensor 3,11,18,29,38,45 ... Central temperature sensor 4,12,19,30,39,46 ... Comparator DESCRIPTION OF SYMBOLS 6 ... Magnetic body 7 ... Coil device 15 ... Dielectric 16 ... Electrode pair 22 ... Heat ray absorber 23-26 ... Bar-shaped infrared heater 33 ... Hot air supply pipe 41 ... Bar-shaped radiator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09G 3/28 G02F 1/133 G09G 5/00 H01J 17/28

Claims (5)

(57) [Claims] 1. An electronic display panel which performs an electroluminescent display accompanied by heat generation, by heating a peripheral portion of the panel during a light emitting display operation, thereby controlling the temperature of the entire display panel to be substantially uniform. Panel temperature control method for electronic display panel. 2. An electronic display panel for performing an electroluminescent display accompanied by heat generation, wherein the heating unit is provided at a peripheral portion of the panel and the heating unit is operated such that the entire display panel has a substantially uniform temperature. An electronic display panel comprising driving means. 3. The electronic display panel according to claim 2, wherein the heating means is divided into a plurality of parts so as to be operated independently along the periphery of the panel. 4. An electronic display panel according to claim 2, further comprising a peripheral temperature measuring section for measuring a temperature of a peripheral portion of the panel, wherein a reference signal corresponding to a reference temperature for temperature control is provided. An electronic display panel provided with a signal generating unit for outputting, wherein the driving unit controls the operation of the heating unit based on the difference between the temperature signal from the peripheral temperature measuring unit and the reference signal. 5. The electronic display panel according to claim 4, wherein a central temperature measuring section for measuring a temperature is provided at a central portion of the panel, and the central temperature measuring section outputs a reference signal. Electronic display panel.