Display Panel Temperature-Adaptive Luminance Correction
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Solution Overview
Problem
Display devices face challenges in maintaining high image quality due to changes in electrical characteristics of light-emitting elements and transistors over time, particularly when temperature affects measurement accuracy, leading to inappropriate correction values.
Innovation Solution
A display device with a temperature sensor, characteristics measuring unit, correction value computation unit, correction processing unit, and display control unit that measures and corrects voltage applied to pixel circuits within a predetermined temperature range to ensure accurate luminance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If measurement is performed at low temperature to extend operating range, then temperature adaptability is improved, but measurement precision deteriorates due to noise affecting correction amount
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the measurement temperature range based on ambient conditions. When the ambient temperature is low, the measurement temperature is raised to a higher range where noise is reduced, thereby maintaining measurement precision while still operating across different ambient temperatures. This resolves the contradiction by changing the measurement parameter (temperature) adaptively rather than fixing it.
Solution Approach 2:
The patent implements dynamics by making the measurement temperature flexible and adjustable rather than fixed. The measurement temperature is dynamically changed according to the ambient temperature conditions - raised when ambient temperature is low to avoid noise, and lowered when ambient temperature is high to maintain adaptability. This dynamic adjustment resolves the contradiction between temperature adaptability and measurement precision.
2Measurement precision
If measurement temperature is raised to reduce noise, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the measurement temperature based on ambient conditions rather than maintaining a constantly high temperature. When ambient temperature is already high, the measurement temperature is kept lower, reducing power consumption. When ambient temperature is low, the measurement temperature is raised only temporarily during measurement to ensure precision. This dynamic approach resolves the contradiction between measurement precision and power consumption.
Solution Approach 2:
The patent implements periodic action by performing measurements at optimally timed intervals rather than continuously. Measurements are conducted periodically when needed, with the measurement temperature raised only during these periodic measurement events rather than maintaining high temperature continuously. This reduces overall power consumption while ensuring measurement precision when measurements are actually performed.
3Measurement precision
If continuous measurement is performed to track characteristics, then correction accuracy is improved, but productivity deteriorates due to increased measurement time
Solution Approach 1:
The patent applies periodic action by performing measurements at specific intervals rather than continuously. Measurements are conducted periodically based on predetermined conditions (such as temperature thresholds or time intervals), which reduces the total measurement time and improves productivity while still maintaining sufficient correction accuracy through regular monitoring at critical moments.
Solution Approach 2:
The patent implements partial action by performing measurements only when necessary based on ambient temperature conditions rather than continuously. When ambient temperature is within an optimal range, measurements may be skipped or performed less frequently, reducing measurement time and improving productivity while still maintaining adequate correction accuracy when measurements are performed under favorable conditions.
Data Source
AI summary
A display device includes a display panel, a temperature sensor, a characteristics measuring unit, a correction value computation unit, a correction processing unit, and a display control unit. A plurality of pixel circuits include, as an element, a light-emitting element; and a drive transistor configured to control an electric current that flows in the light-emitting element. The characteristics measuring unit obtains the measurement value when the temperature is in a predetermined temperature range and does not obtain the measurement value when the temperature is out of the temperature range.