Heat up measurement method inside display screenTechnical field
The present invention relates to the measurement methods that heats up inside display apparatus test field more particularly to a kind of display screen.
Background technique
The very big driving capability of some needs of LCD (Liquid Crystal Display, liquid crystal display) module group backlight.However, the efficiency of the LCD backlight element of such as LED (Light-Emitting Diode, light emitting diode) lamp string etc is not up toTo 100%, the form of small part conversion thermal energy is had within shielding；In this way, continuing with the display screen available machine time, in display screenTemperature can rise.
Experience have shown that the temperature rise of the component in display screen is every to increase 10 degrees Celsius, the service life of the component in display screenHalf will be shortened.And there is a large amount of IC chips in display screen, so the test of screen temperature rise is one weight of LCD mould groupThe performance indicator wanted, it is extremely important for shielding interior temperature detection.
In the prior art, the means of temperature detection are more complicated in shielding, and are not easy to the operation ease of operator, andAnd measurement precision is not high.
Therefore, those skilled in the art is dedicated to developing a kind of operation ease and measurement precision of capable of improvingHeat up measurement method inside display screen.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide one kind can improve surveyMeasure the measurement method that heats up inside the display screen of operation ease and measurement precision.
To achieve the above object, the present invention provides the measurement methods that heats up inside a kind of display screen, comprising:
First step: thermistor is set in display screen；
Second step: obtaining the characteristic curve of thermistor, the characteristic curve be indicate the resistance value of thermistor withTemperature change and the relation curve that changes；
Third step: the resistance value of thermistor is persistently detected；
Four steps: the soaking condition inside display screen is judged according to the resistance value of the thermistor detected.
Preferably, the thermistor is negative tempperature coefficient thermistor.
Preferably, first step using thermistor as display screen in circuit element in a manner of be arranged in display screenThermistor.
Preferably, second step obtains the characteristic curve of thermistor by experiment measurement.
Preferably, third step is constantly to sample the resistance value of thermistor in a manner of Fixed Time IntervalMode detect the resistance value of thermistor.
It preferably, whether is more than predetermined resistance range according to the resistance value of the thermistor detected in four stepsTo judge whether the temperature inside display screen is increased to more than predetermined temperature range.
Preferably, in four steps, according to the variation of the resistance value of the thermistor detected within a predetermined period of timeAmplitude is come whether judge the heating inside display screen be more than predetermined heating rate.
Preferably, the inside heating that heating measurement method is used to detect liquid crystal display inside the display screen measures.
Heating measurement method can judge display screen according to the variation of thermistor inside display screen according to the present inventionInterior temperature rise, thus, it is possible to improve the accuracy of heating measurement operation ease and heating measurement, and can further rootJudge whether product is qualified according to heating detection, thus increases the qualification rate of shipment, extend the service life of display screen finished product.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, withIt is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
In conjunction with attached drawing, and by reference to following detailed description, it will more easily have more complete understanding to the present inventionAnd its adjoint advantage and feature is more easily to understand, in which:
Fig. 1 is the flow chart of heating measurement method inside display screen according to the preferred embodiment of the invention.
It should be noted that attached drawing is not intended to limit the present invention for illustrating the present invention.Note that indicating that the attached drawing of structure canIt can be not necessarily drawn to scale.Also, in attached drawing, same or similar element indicates same or similar label.
Specific embodiment
The present inventor is advantageously discovered that, is typically arranged with temperature-sensitive inside the display screen of such as liquid crystal display etcResistance is especially configured with negative temperature coefficient (NTC, Negative temperature coefficient) thermistor, thatThe resistance value of thermistor can change with the temperature change in screen；It, can be by measuring temperature-sensitive according to this ruleThe resistance value of resistance judges the temperature change in screen
Fig. 1 is the flow chart of heating measurement method inside display screen according to the preferred embodiment of the invention.
Specifically, as shown in Figure 1, heating measurement method includes: inside display screen according to the preferred embodiment of the invention
First step S1: thermistor is set in display screen；
For example, being typically arranged with thermistor inside the display screen of such as liquid crystal display etc；First step S1 as a result,Thermistor is set in display screen in a manner of the element of circuit in using thermistor as display screen.
Generally, the thermistor is negative tempperature coefficient thermistor.
Second step S2: obtaining the characteristic curve of thermistor, and the characteristic curve is the resistance value for indicating thermistorThe relation curve changed with temperature change；
For example, display screen manufacturer can provide the characteristic curve of thermistor in the product description of display screen.OrPerson can obtain the characteristic curve of thermistor by experiment measurement.
Third step S3: the resistance value of thermistor is persistently detected；Specifically, it is persistently detected under display screen open stateThe resistance value of thermistor.
For example, third step S3 is constantly to sample the resistance value of thermistor in a manner of Fixed Time IntervalMode detect the resistance value of thermistor.
Four steps S4: the soaking condition inside display screen is judged according to the resistance value of the thermistor detected.
Specifically, for example, whether can be more than pre- according to the resistance value of the thermistor detected in the fourth step s 4Determine resistance range to judge whether the temperature inside display screen is increased to more than predetermined temperature range, it thus can be further according to literTemperature detector survey judges whether product is qualified.
It, can be according to the resistance value of the thermistor detected within a predetermined period of time alternatively, in the fourth step s 4Amplitude of variation come judge heating inside display screen whether be more than predetermined heating rate (i.e., if shield internal heating whether mistakeFastly), thus further can judge whether product is qualified according to heating detection.
For example, in specific application, heating measurement method is for examining inside display screen according to the preferred embodiment of the inventionThe inside for surveying liquid crystal display, which is heated up, to be measured.
Inside display screen according to the preferred embodiment of the invention heating measurement method can according to the variation of thermistor comeJudge the temperature rise in display screen, thus, it is possible to improve the accuracy of heating measurement operation ease and heating measurement, Er QiekeFurther to judge whether product is qualified according to heating detection, thus increases the qualification rate of shipment, extend making for display screen finished productUse the period.
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not officeBe limited to form disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification andEnvironment, and can be changed within that scope of the inventive concept describe herein by the above teachings or related fields of technology or knowledgeIt is dynamic.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be appended by the present inventionIn scope of protection of the claims.