Display Device Temperature Compensation Circuit
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Solution Overview
Problem
Display devices experience reduced charge mobility at low temperatures, leading to insufficient pixel activation due to varying temperature-dependent operating characteristics of the driving circuit.
Innovation Solution
A display device with a temperature compensation system that includes multiple temperature sensing circuits and a voltage generating circuit to adjust the clock signal based on the lowest voltage drop among result voltages from these circuits, ensuring adequate gate-on and gate-off voltage levels, regardless of the positional relationship with the light source unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device operates in a low-temperature environment, then the charge mobility decreases, but the pixels cannot be sufficiently turned on
Solution Approach 1:
The patent changes the voltage parameter of the clock signal based on temperature conditions. The voltage generating circuit outputs a clock signal with adjusted voltage level according to the temperature sensed by the temperature sensor. When temperature is low, the clock signal voltage is increased to compensate for reduced charge mobility, ensuring pixels can still be sufficiently activated. This parameter adaptation resolves the contradiction between maintaining reliable pixel activation and dealing with temperature-dependent charge mobility variations.
2Reliability
If a temperature compensation function is added to the display device, then the charge mobility variation is compensated, but the device complexity increases
Solution Approach 1:
The patent merges the temperature sensing function and voltage generation function into an integrated temperature compensation circuit. The temperature sensor is electrically connected to the voltage generating circuit, which in turn is connected to the gate driver. This combined structure allows the system to sense temperature and automatically adjust the clock signal voltage without requiring separate complex control systems, thereby compensating for charge mobility variation while minimizing the increase in device complexity.
Solution Approach 2:
The temperature compensation circuit operates autonomously by sensing its own operating temperature and automatically adjusting the clock signal voltage accordingly. The temperature sensor monitors the temperature of the gate driver circuit, and the voltage generating circuit self-adjusts the clock signal voltage based on this temperature information, eliminating the need for external control or manual intervention. This self-service mechanism maintains operating characteristic stability without adding significant complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents the phenomenon of insufficient pixel activation by compensating for lowered charge mobility at low temperatures, ensuring consistent display performance across varying temperature conditions.
Implementation Method 1
a temperature sensor which includes at least three temperature sensing circuits which are disposed adjacent to the gate driver
Implementation Method 2
each of the temperature sensing circuits may include a plurality of diode-connected transistors connected to each other in series
Data Source
AI summary
A display device includes a display panel which includes gate lines and data lines, a gate driver electrically connected to the gate lines, a temperature sensor which includes at least three temperature sensing circuits which are disposed adjacent to the gate driver, and a voltage generating circuit which outputs a test voltage to each of the temperature sensing circuits and outputs a clock signal, which is compensated based on a result voltage having a lowest voltage level among result voltages provided from the temperature sensing circuits, to the gate driver.